Does the federal tax lien attach to after-acquired property?

Yes. Under IRC 6321 (verify at IRS.gov and in current IRC text), the federal tax lien attaches to all property and rights to property, whether real or personal, belonging to the taxpayer -- including property acquired after the lien arises. This means a taxpayer who owns no property at the moment of assessment still has a valid lien attaching to every asset they acquire going forward, until the CSED expires or the liability is satisfied. A client who receives an inheritance, acquires real estate, opens a new bank account, or starts a new business after the assessment date takes all of those assets subject to the pre-existing federal tax lien. The after-acquired property feature is one of the features that makes the federal tax lien the IRS's broadest collection tool, and it is one that practitioners must advise clients about explicitly when the lien has arisen but the taxpayer has few current assets. Verify all current IRC 6321 lien-scope provisions and any applicable exemptions at IRS.gov and with qualified legal counsel.

What is the purchase money mortgage super-priority under IRC 6323(b)(10)?

IRC 6323(b)(10) (verify at IRS.gov and in current IRC text) provides that a purchase money mortgage or deed of trust -- a mortgage or deed of trust given to secure the purchase price of property -- has super-priority over a federal tax lien even if the NFTL was filed before the purchase money mortgage was recorded. The rationale is that the purchase money mortgage and the property acquisition occur simultaneously, and the lien cannot have attached to the property before the taxpayer acquired it; the purchase money lender's interest is recognized as superior because without it, the acquisition would not have occurred. For this super-priority to apply, the instrument must be a true purchase money mortgage securing the actual purchase price, not a refinance or cash-out loan. Practitioners representing purchase money lenders in real estate transactions where an NFTL against the buyer exists should document the purchase money character of the loan clearly in the closing records. Verify the current conditions for the IRC 6323(b)(10) purchase money mortgage super-priority at IRS.gov and with qualified legal counsel.

Can the IRS file a new NFTL after the original one expires?

The federal tax lien under IRC 6321 and the NFTL that gives it public notice are both tied to the CSED. If the CSED expires, the lien expires by operation of law under IRC 6322, and the IRS loses its right to collect -- including its ability to file a new or replacement NFTL on the same assessment. The IRS cannot extend the CSED by refiling an NFTL. However, if the CSED has been tolled by an event under IRC 6503 (bankruptcy, OIC pendency, CDP hearing, etc.), the lien has not expired, and the IRS may refile an NFTL if the original NFTL's 10-year refiling period under IRC 6323(g) has passed (verify the current NFTL refiling window and procedures at IRS.gov). IRC 6323(g) provides that an NFTL that is not refiled in the applicable window loses its priority position against subsequent interests, even if the underlying lien under IRC 6321 is still valid between the government and the taxpayer. Practitioners should distinguish between the lien's existence (IRC 6321/6322) and the NFTL's effectiveness as to third parties (IRC 6323(g) refiling requirement). Verify the current NFTL refiling rules and windows at IRS.gov and with qualified legal counsel.

What is an attorney's charging lien and how does it qualify as a super-priority under IRC 6323(b)?

Under IRC 6323(b)(8) (verify at IRS.gov and in current IRC text), an attorney who obtains or assists in obtaining a judgment, settlement, or fund on behalf of a client holds a super-priority lien on that specific recovery -- the attorney's charging lien -- that defeats the federal tax lien even after a valid NFTL has been filed. The super-priority under IRC 6323(b)(8) reflects the policy that attorneys must be able to secure their fees from the very recovery they produced, or they would not take cases for clients with existing tax liens. The attorney's lien under IRC 6323(b)(8) is limited to the amount of the attorney's reasonable compensation for services rendered in obtaining or collecting the specific judgment or settlement at issue; it is not a blanket lien on all client property. For the super-priority to apply, the attorney must have a valid lien recognized under applicable state law, and the lien must be on the specific fund or judgment produced through the attorney's services. Verify the current IRC 6323(b)(8) conditions and applicable state law requirements for attorney's charging liens at IRS.gov and with qualified legal counsel.

How does the federal tax lien affect a taxpayer's ability to sell or refinance real estate?

A federal tax lien that has been perfected by NFTL filing under IRC 6323 attaches to the taxpayer's real property and becomes a cloud on title. Title insurance companies will not insure title to real property subject to an undischarged NFTL, and most mortgage lenders will not close a refinance or purchase loan where an NFTL appears in the chain of title without the lien being addressed. For a sale, the practitioner must either (1) arrange for the NFTL to be discharged under IRC 6325(b) so the title is cleared at closing, typically by applying the net sale proceeds to the tax debt; (2) obtain a subordination under IRC 6325(d) if the buyer's lender agrees to accept a subordinate government lien position; or (3) seek withdrawal under IRC 6323(j) if the statutory conditions are met. For a refinance, the same tools apply, with subordination being the most common -- the IRS agrees to subordinate its lien to the new first mortgage so the refinance can close. The taxpayer's equity position, the outstanding tax debt, and the processing timeline all affect which remedy is most practical. Practitioners should contact Americas Tax well in advance of any scheduled closing to allow sufficient time to file and process the appropriate IRC 6325 application with the IRS. Verify current processing timelines and application requirements at IRS.gov and with qualified legal counsel.

What is the scope of property covered by the federal tax lien under IRC 6321?

IRC 6321 (verify at IRS.gov and in current IRC text) provides that the federal tax lien attaches to 'all property and rights to property, whether real or personal,' belonging to the taxpayer. Courts have interpreted this language very broadly. The lien covers: real property (homes, commercial buildings, raw land); tangible personal property (vehicles, equipment, inventory, household goods); intangible personal property (bank accounts, brokerage accounts, accounts receivable, contract rights); business assets (going-concern value, trade names, customer lists to the extent they are property rights); retirement account interests (subject to ERISA-qualified plan protections and applicable exemptions -- verify at IRS.gov); life insurance cash surrender value; partnership and LLC interests; stock and securities; and after-acquired property of all types. There are statutory exemptions for certain property categories (verify at IRS.gov), and certain ERISA-qualified retirement plans are protected from levy under IRC 6334 even if the lien attaches. The lien scope for purposes of collection may differ from the levy exemptions; practitioners should distinguish between lien attachment and levy authority. Verify the current scope of the IRC 6321 lien and all applicable exemptions at IRS.gov and with qualified legal counsel before advising any client.

IRC 6321-6323 Federal Tax Lien Creation and Priority

Q: What is the secret lien and how is it different from a Notice of Federal Tax Lien?

The 'secret lien' refers to the federal tax lien that arises automatically under IRC 6321 upon assessment and demand, before any Notice of Federal Tax Lien (NFTL) is filed. It is called 'secret' because the lien is valid and enforceable against the taxpayer without any public filing, meaning third parties searching public records would not find it. The lien attaches to all property and rights to property belonging to the taxpayer. However, the secret lien is NOT valid against the four categories of third parties protected under IRC 6323(a) (purchasers, holders of security interests, mechanic's lienors, and judgment lien creditors) until the IRS files an NFTL in the proper location under IRC 6323(f). The NFTL is the public filing that gives constructive notice to third parties and determines the IRS's priority position against them. The distinction is critical for practitioners: the lien exists and encumbers taxpayer property immediately upon assessment and demand, but only NFTL filing perfects the IRS's priority against protected third parties. Verify current IRC 6321 and 6323 requirements at IRS.gov and in current IRC text.

Scope of this guide: This guide covers the statutory framework of IRC 6321, 6322, and 6323 -- lien creation, lien period, and the priority rules governing the IRS's position against third parties, including the four IRC 6323(a) protected parties, the ten IRC 6323(b) super-priorities, and the 45-day commercial financing exception under IRC 6323(c). For downstream lien remedies -- discharge, subordination, and withdrawal -- see our guide on federal tax lien discharge, subordination, and withdrawal. For CDP hearing rights triggered by NFTL filing, see our guide on IRC 6330 and 6320 collection due process CDP rights. This guide is the upstream statutory anchor for the Americas Tax federal lien cluster.

1. Overview: The IRC 6321-6323 Lien Framework

The federal tax lien is the IRS's broadest collection tool. Unlike a levy, which seizes specific property, the lien operates as a legal claim against all of a taxpayer's property and rights to property simultaneously. IRC 6321, 6322, and 6323 establish a three-part statutory framework: creation, duration, and priority. Each section performs a distinct function.

IRC 6321 (verify at IRS.gov and in current IRC text) creates the lien. The statute provides that if any person liable to pay any tax neglects or refuses to pay after demand, the amount of that tax becomes a lien in favor of the United States upon all property and rights to property, whether real or personal, belonging to that person. The lien is self-executing -- it arises the moment assessment and demand conditions are satisfied, without court action or public filing.

IRC 6322 (verify at IRS.gov and in current IRC text) governs the lien's duration. The lien arises at the time of assessment and continues until the liability is satisfied or becomes unenforceable by lapse of time, tying the lien's life directly to the Collection Statute Expiration Date (CSED) under IRC 6502.

IRC 6323 (verify at IRS.gov and in current IRC text) governs priority. It identifies four categories of third parties who are protected against an unfiled NFTL, creates ten categories of interests that defeat the IRS even after NFTL filing, establishes the 45-day commercial financing protection, and sets the NFTL filing location rules. IRC 6323 is where practitioner disputes are usually won or lost.

Together, these three statutes determine when the lien exists, how long it lasts, and whose competing interests it defeats or yields to. Practitioners advising clients on federal tax lien disputes -- real estate closings blocked by NFTLs, commercial lender priority questions, subordination requests, CDP hearings, and OIC negotiations -- must understand all three sections and how they interact.

Warning: The Secret Lien -- IRC 6321 Attaches Without NFTL Filing

The federal tax lien under IRC 6321 attaches automatically once assessment and demand conditions are satisfied. The IRS does not need to file a Notice of Federal Tax Lien for the lien to exist and be valid against the taxpayer personally. A taxpayer who searches the public records and finds no NFTL may still have a federal tax lien encumbering all of their property and rights to property. The NFTL is the public filing that protects the IRS's priority position against certain third parties under IRC 6323(a) -- purchasers, security interest holders, mechanic's lienors, and judgment lien creditors. Until the NFTL is filed, those four categories of third parties may acquire interests in the taxpayer's property free of the government's lien. Once the NFTL is filed, the IRS's position is protected and those parties' subsequent interests are subordinate to the government's claim. Practitioners representing clients in collection matters must advise on the existence of the secret lien, not just the public NFTL record. Verify all current IRC 6321 lien-attachment requirements at IRS.gov and in current IRC text.

2. IRC 6321: Federal Tax Lien Creation -- Assessment, Demand, and Property Scope

IRC 6321 (verify at IRS.gov and in current IRC text) establishes the lien through two conditions that must both be satisfied. First, the IRS must have assessed a tax liability against the taxpayer under IRC 6201 and 6203. Assessment is the formal bookkeeping act by which the IRS records the tax on its assessment rolls. It is typically preceded by a notice of deficiency and Tax Court proceeding, or it may follow a return filed by the taxpayer or a revenue officer's assessment of a trust fund recovery penalty. Second, the IRS must have made a notice and demand for payment under IRC 6303, and the taxpayer must have neglected or refused to pay the tax within 10 days of that demand (verify current demand-period requirements at IRS.gov).

2.1 Scope of the Lien: All Property and Rights to Property

The scope of the IRC 6321 lien is extraordinarily broad. The lien attaches to "all property and rights to property, whether real or personal," belonging to the taxpayer. Courts have interpreted this language expansively. The lien attaches to real property, personal property (tangible and intangible), bank accounts, wages, retirement interests (subject to ERISA and certain exemptions -- verify at IRS.gov), business assets, accounts receivable, contract rights, life insurance cash value, stock and partnership interests, and property the taxpayer acquires after the lien arises. The lien follows the property unless a specific IRC 6323 super-priority or other exemption applies. Verify the current scope of "property and rights to property" under IRC 6321 at IRS.gov and with qualified legal counsel.

2.2 After-Acquired Property

One of the most significant features of the federal tax lien is that it attaches to after-acquired property -- property the taxpayer acquires after the lien arises, not just property held at the time of assessment. This means a taxpayer who owns no property at the moment of assessment still has a valid lien attaching to every asset they acquire going forward, until the CSED expires or the liability is satisfied. A client who receives an inheritance, acquires real estate, or starts a new business after the assessment is made takes all of those assets subject to the existing lien. Advise clients that the lien follows future acquisitions, not just current holdings.

3. IRC 6322: Period of the Federal Tax Lien -- Duration, CSED, and Tolling

IRC 6322 (verify at IRS.gov and in current IRC text) provides that the lien arises at the time the assessment is made and continues until the liability is satisfied or becomes unenforceable by reason of lapse of time. The phrase "lapse of time" links the lien directly to the Collection Statute Expiration Date (CSED) under IRC 6502, which generally gives the IRS 10 years from the date of assessment to collect by levy or proceeding in court.

3.1 The CSED and Lien Expiration

When the CSED expires, the underlying tax liability becomes unenforceable and the lien automatically ceases under IRC 6322. There is no separate filing required to terminate the lien -- it expires by operation of law when the CSED runs out. The IRS is required to release the lien under IRC 6325(a)(1) within 30 days after the liability is satisfied or becomes unenforceable. If the IRS fails to release a lien that has expired, the taxpayer (and any third party with a property interest at stake) may request a Certificate of Release under IRC 6325 and, if the IRS refuses to issue one when required, may bring a civil action under IRC 7432. Verify all current CSED and lien-release procedures at IRS.gov and in current IRC text.

3.2 CSED Tolling Events and Their Effect on Lien Duration

Because the federal tax lien period under IRC 6322 is tied directly to the CSED, every event that tolls (suspends) the CSED under IRC 6503 also extends the lien period by the same duration. Tolling events that practitioners must track include: (1) the pendency of a bankruptcy case plus 6 months under IRC 6503(h); (2) the pendency of an offer in compromise application under IRC 6503(i); (3) the pendency of a CDP hearing under IRC 6330(e)(1), which tolls the CSED by separate statute; (4) a taxpayer assistance order or TAS referral under IRC 7811; (5) the taxpayer's absence from the United States for a continuous period of at least 6 months under IRC 6503(c); and (6) other events specified in IRC 6503. Practitioners who calculate lien expiration using only the base 10-year assessment date will systematically underestimate the remaining lien period when any tolling event has occurred. Verify all tolling events and their duration using the IRS CSED transcript (available on IRS Account Transcripts) before advising any client on lien period. See also our guide on IRC 6503 CSED tolling and collection statute of limitations.

4. IRC 6323: Priority Against Third Parties -- The Complete Framework

IRC 6323 (verify at IRS.gov and in current IRC text) is the most complex of the three sections and the one most frequently litigated. It answers the question: when the federal tax lien conflicts with a third party's interest in the taxpayer's property, who wins? The answer depends entirely on (1) which category of third-party interest is at stake, (2) whether an NFTL was validly filed before or after the interest arose or was perfected, and (3) whether the third-party interest qualifies for one of the statute's super-priority or commercial-financing exceptions.

4.1 IRC 6323(a): The Four Categories Protected Against an Unfiled Lien

Before an NFTL is filed, the "secret" IRC 6321 lien is valid against the taxpayer but NOT valid against four categories of third parties who acquired their interests before the NFTL was filed (verify at IRS.gov): (1) purchasers for adequate and full consideration without actual notice of the lien; (2) holders of security interests perfected under local law; (3) mechanic's lienors protected under local law against a subsequent judgment lien; and (4) judgment lien creditors who perfected their judgments under state law. Once the NFTL is filed in the correct location under IRC 6323(f), these protections end for subsequently arising interests; the IRS takes priority over purchasers, security interest holders, and judgment creditors who acquire their interests after the NFTL filing date.

4.2 IRC 6323(b): Ten Super-Priorities That Defeat the IRS Even After NFTL Filing

The super-priorities under IRC 6323(b) are the strongest defenses available to third parties in federal tax lien disputes. They represent Congressional policy judgments that certain categories of interests -- typically ones that support real estate transactions, commercial credit, and essential services -- should be protected even from a perfected government lien. Each category has specific conditions that must be met for the super-priority to apply. Practitioners advising third parties in lien disputes must identify which category, if any, applies to their client's interest, and confirm that all conditions are satisfied.

IRC 6323(b) Super-Priorities: The Strongest Lien Defense Available to Third Parties

The ten categories of interests protected under IRC 6323(b) defeat the federal tax lien even after a valid NFTL has been filed. These are not exceptions to notice -- they are absolute statutory super-priorities. A third party who qualifies under any IRC 6323(b) category does not need to have been unaware of the NFTL; the super-priority applies even if the NFTL was filed before the interest arose, as long as the specific conditions for the applicable category are met. For real estate practitioners, the most commonly relevant categories are: purchase money mortgages (IRC 6323(b)(10)), real property tax and special assessment liens (IRC 6323(b)(6)), and mechanic's liens for repair and improvement (IRC 6323(b)(7)). For commercial lenders, the 45-day commercial financing exception under IRC 6323(c) is the separate but complementary protection for floating-lien assets. Each super-priority has its own eligibility requirements. Verify all IRC 6323(b) conditions with qualified legal counsel before asserting a super-priority claim against the IRS.

5. IRC 6323(c): The 45-Day Commercial Financing Exception

IRC 6323(c) (verify at IRS.gov and in current IRC text) creates a special protection for commercial lenders operating under revolving credit facilities secured by floating assets such as accounts receivable and inventory. This provision recognizes that commercial lenders routinely advance funds against a constantly changing pool of assets, and that rigidly applying first-in-time priority against a newly filed NFTL would immediately destroy the lender's ability to advance against new receivables, potentially forcing a borrower into insolvency.

5.1 How the 45-Day Window Works

Under IRC 6323(c), a commercial financing security interest that was in place before the NFTL was filed (and that met all applicable perfection requirements under local law) retains its priority over the IRS for commercial transactions that come into existence within 45 days after the NFTL filing. This means that accounts receivable generated, and inventory acquired, within the 45-day window after the NFTL is filed are still covered by the lender's pre-existing security interest, and the lender's claims on those specific assets are senior to the IRS's lien. After the 45-day window closes, the IRS's lien is senior to the lender's security interest with respect to new assets that arise or are acquired.

The 45-Day Commercial Financing Window: Commercial Lenders Must Act Immediately

When an NFTL is filed against a commercial borrower, the 45-day clock under IRC 6323(c) begins running immediately. Commercial lenders with revolving credit facilities secured by accounts receivable or inventory must: (1) confirm within the 45-day window which specific receivables and inventory items arose or were acquired during that period; (2) document their security interest and perfection status as of the NFTL filing date; (3) evaluate whether to freeze new advances after the window closes or negotiate a subordination agreement with the IRS under IRC 6325(d); and (4) assess the total exposure to the IRS's competing claim on post-window assets. The NFTL filing location under IRC 6323(f) also matters: if the NFTL is filed in the wrong jurisdiction, the 45-day window may not have started -- or the lender may argue the NFTL was ineffective. These questions require prompt legal review. Verify all IRC 6323(c) conditions, the 45-day calculation, and perfection requirements at IRS.gov and with qualified legal counsel.

5.2 Qualifying Commercial Financing Assets

IRC 6323(c) covers "commercial transactions financing agreements" -- broadly, agreements under which a person commits to make loans or advance credit for commercial purposes, where the security consists of commercial financing assets such as paper of a kind ordinarily arising in commercial transactions, accounts receivable, mortgages on real property, and inventory (verify the exact statutory definition at IRS.gov and in current IRC text). Consumer loans, residential mortgages, and personal property loans outside the commercial context are generally outside the scope of the IRC 6323(c) protection. Verify that the specific assets and loan structure qualify before relying on the 45-day exception.

6. IRC 6323(f): NFTL Filing Location Requirements

IRC 6323(f) (verify at IRS.gov and in current IRC text) specifies where the IRS must file the NFTL to provide effective constructive notice to third parties. Correct filing location is not a technicality -- it determines whether the NFTL achieves its purpose of protecting the government's priority position against the IRC 6323(a) protected parties.

6.1 Real Property: County-Level Filing

For real property, the NFTL must be filed in the office within the state (or the county, or other governmental subdivision) designated by the laws of that state, in which the real property is situated. This is typically the county recorder of deeds, register of deeds, or county clerk (verify the correct filing office in the applicable state). An NFTL filed in the wrong county -- for example, in the county of the taxpayer's old address rather than the county where the real property is located -- is defectively filed as to that property and may not provide effective constructive notice. Verify the correct filing office for each piece of real property at stake in any lien dispute.

6.2 Personal Property: Taxpayer's Residence State

For personal property (both tangible and intangible), the NFTL must be filed in the state in which the taxpayer resides at the time of the NFTL filing. The filing is effective in that state even if the personal property is physically located elsewhere. If the taxpayer does not reside in the United States at the time of filing, the NFTL must be filed in the District of Columbia. Practitioners should verify the taxpayer's state of residence as of the NFTL filing date when assessing whether an existing NFTL was properly filed as to personal property.

Warning: NFTL Filed in Wrong Location May Not Give Constructive Notice

An NFTL filed in the wrong state or county under IRC 6323(f) does not give effective constructive notice to third parties. A defective NFTL filing may mean: (1) the four categories of third parties under IRC 6323(a) (purchasers, security interest holders, mechanic's lienors, judgment lien creditors) retain their priority against the government even for interests acquired after the attempted filing; (2) the 45-day commercial financing window under IRC 6323(c) may not have started -- there is no valid NFTL filing to trigger the window; and (3) a real estate purchaser who conducted a title search in the correct jurisdiction and found nothing may have a valid super-priority claim against the government's lien. Practitioners representing third parties in any lien dispute should always pull the actual NFTL filing and confirm (a) the exact filing date, (b) the filing jurisdiction, (c) the taxpayer's residence address at the time of filing, and (d) whether the specific property at issue is in the correct jurisdiction for that filing. An incorrectly filed NFTL is a litigation asset. Verify all current IRC 6323(f) filing requirements and the consequences of defective filing at IRS.gov and with qualified legal counsel.

7. Federal Tax Lien Priority Comparison: IRC 6323(a), (b), and (c)

The table below summarizes the key categories of third-party interests, their statutory basis, whether NFTL filing affects their priority position, the key condition for the protection to apply, and the practitioner action for each category. Verify all categories, conditions, and thresholds in current IRC text and at IRS.gov before advising any client.

Category / Interest	Statutory Basis	NFTL Filing Matters?	Key Condition	Practitioner Action
IRC 6323(a) -- Protected Parties: Priority Lost Once NFTL Is Filed
Purchaser for value	IRC 6323(a)(1)	Yes -- protected only before NFTL filed	Adequate and full consideration; no actual notice of lien	Confirm NFTL filing date; advise on closing timing relative to filing
Holder of security interest	IRC 6323(a)(2)	Yes -- protected only before NFTL filed	Security interest perfected under local law against subsequent judgment lien	Confirm UCC financing statement date vs. NFTL filing date; check state law perfection
Mechanic's lienor	IRC 6323(a)(3)	Yes -- protected only before NFTL filed	Lien for services, labor, or materials; protected under local law	Confirm lien perfection date under state law vs. NFTL filing date
Judgment lien creditor	IRC 6323(a)(4)	Yes -- protected only before NFTL filed	Judgment lien perfected under state law before NFTL filing	Confirm judgment docketing/recording date under state law vs. NFTL filing date
IRC 6323(b) -- Super-Priorities: Defeat IRS Even After Valid NFTL Is Filed
Attorneys' liens	IRC 6323(b)(8)	No -- super-priority survives NFTL	Lien on client's judgment or settlement arising from attorney's services	Assert attorney's charging lien on recovery proceeds; document services rendered
Certain insurance contract interests	IRC 6323(b)(9)	No -- super-priority survives NFTL	Beneficiary or assignee of life insurance or endowment in specified circumstances	Verify qualifying policy type and beneficiary/assignee status under IRC 6323(b)(9)
Passbook loans	IRC 6323(b)(3)	No -- super-priority survives NFTL	Financial institution loan secured by deposits at the same institution	Confirm institution holds both the deposit and the loan; verify same-institution requirement
Real property tax and special assessment liens	IRC 6323(b)(6)	No -- super-priority survives NFTL	State or local ad valorem real property taxes or special assessments	Ensure real property tax liens are paid or addressed in any closing; they rank ahead of IRS
Residential property purchaser (principal residence)	IRC 6323(b)(4)	No -- super-priority survives NFTL	Purchase price under $500,000 (verify current threshold); principal residence use	Confirm purchase price threshold and residential use; document at closing
Real property purchases in foreclosure	IRC 6323(b)(5)	No -- super-priority survives NFTL	Purchaser at foreclosure or execution sale meeting statutory conditions	Confirm foreclosure sale procedures and purchase price compliance with IRC 6323(b)(5)
Mechanic's liens for repair or improvement	IRC 6323(b)(7)	No -- super-priority survives NFTL	Goods and services for repair or improvement of property; limited dollar conditions	Verify services and amounts qualify under IRC 6323(b)(7); document contract and payments
Purchase money mortgage or deed of trust	IRC 6323(b)(10)	No -- super-priority survives NFTL	Mortgage or deed of trust given to secure purchase price of property	Confirm loan is a true purchase-money instrument; document in closing records
Retail purchasers	IRC 6323(b)(2)	No -- super-priority survives NFTL	Purchase of property at retail in ordinary course of business	Confirm ordinary-course retail transaction; consumer purchases from business inventory qualify
Certain advances and obligatory disbursements	IRC 6323(b)(1)	No -- super-priority survives NFTL	Obligatory future advances made under a binding commitment entered before NFTL filed	Review commitment date and obligatory vs. optional advance status before NFTL filing date
IRC 6323(c) -- Commercial Financing Exception: 45-Day Post-NFTL Window
Commercial financing security interest (accounts receivable, inventory)	IRC 6323(c)	Yes -- 45-day window begins on NFTL filing date	Security interest in qualifying commercial financing assets perfected before NFTL; assets arising within 45 days after filing	Identify NFTL filing date; audit which receivables and inventory arose within 45 days; evaluate post-window exposure and subordination options

8. Practitioner Strategy: Applying the IRC 6321-6323 Framework

Lien Period and CSED Interaction: Every Tolling Event Extends the Lien

The federal tax lien expires only when the underlying CSED expires. Because the CSED under IRC 6502 can be tolled by multiple events under IRC 6503 and other provisions, the actual lien expiration date is often much later than the base 10-year anniversary of the assessment date. Practitioners must pull the IRS Account Transcript and identify every tolling event -- bankruptcy filings, pending OIC applications, CDP hearing requests, TAS referrals, and out-of-country absences -- and calculate the cumulative effect on the CSED. A client who filed for bankruptcy for 18 months plus the required 6-month post-bankruptcy period has a lien that runs at least 24 months beyond the base 10-year assessment date. In complex cases involving multiple tolling events on the same assessment, the CSED may be extended by several years beyond what naive calculation would suggest. This matters for real estate closings, lien subordination requests, and OIC analysis. See our guide on IRC 6503 CSED tolling and collection statute of limitations for the full tolling framework.

8.1 Real Estate Closings Blocked by NFTL

When a title search discloses an NFTL against the seller, the closing is effectively blocked until the lien is addressed. Practitioners have four primary tools. First, lien discharge under IRC 6325(b): the IRS removes the lien from the specific property being sold, typically in exchange for receiving the net proceeds or because other property adequately secures the government's interest. The taxpayer submits Form 14135 and supporting documents; the IRS has 45 days to process the discharge request (verify current processing times at IRS.gov). Second, lien subordination under IRC 6325(d): the IRS agrees to subordinate its lien to the buyer's lender, allowing the closing to proceed with the lien remaining on the property junior to the new mortgage. Subordination is often faster for closings involving a mortgage. Third, withdrawal under IRC 6323(j): if the NFTL was improperly filed or the taxpayer meets the statutory conditions, the IRS withdraws the filing from the public record. Fourth, CDP hearing under IRC 6320: the taxpayer who received a CDP notice following the NFTL filing may request a hearing to raise collection alternatives and appropriateness arguments. The CDP hearing does not stay NFTL enforcement but preserves administrative and court remedies. See our guide on federal tax lien discharge, subordination, and withdrawal for the full remedies framework.

8.2 OIC Negotiations and Lien Strategy

An accepted offer in compromise under IRC 7122 satisfies the underlying tax liability, which causes the lien to expire under IRC 6322. But the path from OIC application to acceptance involves a CSED tolling period -- the CSED is tolled for the period the OIC is pending plus 30 days after rejection, which extends the lien period. Practitioners must weigh the OIC tolling cost against the benefit of potential acceptance and lien release. See our guide on the IRC 7122 offer in compromise statutory framework for the full OIC analysis.

8.3 CDP Hearing and Lien Priority

A taxpayer who receives a CDP notice following an NFTL filing under IRC 6320 has 30 days to request a CDP hearing. The CDP hearing provides the opportunity to raise collection alternatives (installment agreement, OIC, currently-not-collectible status) and to challenge the appropriateness of the lien action. While the CDP hearing does not undo the NFTL filing, an agreement reached at the hearing may include a subordination or withdrawal as part of the overall resolution. CDP rights and lien remedies are complementary, not mutually exclusive. See our guide on IRC 6330 and 6320 collection due process CDP rights for the full CDP framework.

8.4 Challenging Priority Disputes in Federal Court

When a priority dispute cannot be resolved administratively, practitioners may have recourse to federal district court. The United States may be a party to a lien foreclosure action (verify current rules for joining the United States as a party and applicable quiet title procedures). The key legal questions in a federal court lien dispute typically are: (1) Was the NFTL validly filed in the correct location under IRC 6323(f)? (2) Did the third party's interest arise and perfect before the NFTL filing, establishing priority under IRC 6323(a)? (3) Does the third party's interest qualify for one of the IRC 6323(b) super-priorities? (4) For commercial lenders, did the disputed assets arise within the 45-day window under IRC 6323(c)? Each question requires documentary evidence -- the NFTL itself, the local filing records, UCC financing statements, deed records, and loan documents -- gathered from both IRS and third-party sources. Verify all applicable federal court procedures for lien priority litigation with qualified legal counsel.

Practitioner Note: When NFTL Blocks a Real Estate Closing, Subordination Is Often Faster Than Discharge

When a client's NFTL blocks a real estate closing, lien subordination under IRC 6325(d) is frequently the faster and more practical tool, compared to discharge under IRC 6325(b). Discharge removes the lien from the specific property entirely, but the IRS typically requires that the sale proceeds be applied to the tax debt or that the government's interest in the remaining collateral is fully secured. Subordination, by contrast, simply adjusts the priority order: the IRS lien remains on the property, but the buyer's lender goes ahead of it in priority, allowing the closing to proceed. For transactions where the seller has significant equity and the closing must happen quickly, subordination may be processed faster and may not require application of the full proceeds to the debt. The right tool depends on the specific facts -- property equity, lien balance, closing timeline, and whether the taxpayer plans to pay the debt in full. CDP rights under IRC 6320 must be preserved separately from the closing strategy; missing the 30-day CDP hearing request deadline eliminates the right to administrative and Tax Court review of the lien action, regardless of which closing remedy is used. See the federal tax lien practitioner representation guide for a broader overview of lien representation strategy.

9. Frequently Asked Questions: IRC 6321, 6322, and 6323

What triggers the federal tax lien under IRC 6321?

Under IRC 6321 (verify at IRS.gov and in current IRC text), the federal tax lien arises automatically when two conditions are both satisfied: (1) a tax liability has been assessed against the taxpayer by the IRS, meaning the tax has been formally recorded on the assessment rolls under IRC 6203; and (2) the IRS has made a demand for payment and the taxpayer has neglected or refused to pay the tax after that demand. When both conditions are met, a lien in favor of the United States attaches to all property and rights to property, whether real or personal, belonging to the taxpayer at that moment and to all property acquired thereafter. The lien is created by statute and arises without any court action, filing, or further notice to the taxpayer beyond the assessment and demand. No NFTL filing is required for the lien to attach and be valid against the taxpayer personally. Verify all current IRC 6321 lien-creation requirements, assessment procedures, and demand-notice rules at IRS.gov and in current IRC text before advising any client.

What is the secret lien and how is it different from an NFTL?

The "secret lien" refers to the federal tax lien that arises automatically under IRC 6321 upon assessment and demand, before any Notice of Federal Tax Lien (NFTL) is filed. It is called "secret" because the lien is valid and enforceable against the taxpayer without any public filing, meaning third parties searching public records would not find it. The lien attaches to all property and rights to property belonging to the taxpayer. However, the secret lien is NOT valid against the four categories of third parties protected under IRC 6323(a) (purchasers, holders of security interests, mechanic's lienors, and judgment lien creditors) until the IRS files an NFTL in the proper location under IRC 6323(f). The NFTL is the public filing that gives constructive notice to third parties and determines the IRS's priority position against them. The distinction is critical for practitioners: the lien exists and encumbers taxpayer property immediately upon assessment and demand, but only NFTL filing perfects the IRS's priority against protected third parties. Verify current IRC 6321 and 6323 requirements at IRS.gov and in current IRC text.

When does the federal tax lien expire under IRC 6322?

Under IRC 6322 (verify at IRS.gov and in current IRC text), the federal tax lien arises at the time the assessment is made and continues until the liability is satisfied or becomes unenforceable by reason of lapse of time. In practice, the lien period is tied directly to the Collection Statute Expiration Date (CSED) under IRC 6502, which gives the IRS 10 years from the date of assessment to collect by levy or court proceeding. When the CSED expires, the tax liability becomes unenforceable and the lien automatically ceases. Critically, any event that tolls the CSED under IRC 6503 (such as a pending bankruptcy, a pending offer in compromise, a Collection Due Process hearing, or a taxpayer assistance order) also extends the lien period by the same duration. Practitioners who track only the base 10-year assessment date without accounting for all CSED tolling events may seriously underestimate the remaining lien period. Verify the current IRC 6322 lien-period rules and all applicable CSED tolling provisions at IRS.gov and in current IRC text.

Who are the four protected parties under IRC 6323(a)?

IRC 6323(a) (verify at IRS.gov and in current IRC text) provides that the federal tax lien is NOT valid against four categories of third parties until the IRS files a Notice of Federal Tax Lien in the proper location. The four protected categories are: (1) purchasers -- persons who acquire property for adequate and full consideration in money or money's worth, without actual notice or knowledge of the lien; (2) holders of security interests -- persons who hold a security interest in property acquired by the taxpayer, to the extent that the security interest is protected under local law against a subsequent judgment lien; (3) mechanic's lienors -- persons who hold a lien on real property for services, labor, or materials furnished in connection with construction or improvement of that property, to the extent the lien is protected under local law against a subsequent judgment lien; and (4) judgment lien creditors -- persons who obtain a judgment against the taxpayer and hold a lien by reason of that judgment, to the extent the lien is perfected under applicable state law. Once the IRS files a valid NFTL, these four protected parties lose their protection against the government's lien for interests arising AFTER the NFTL filing. Verify all current IRC 6323(a) protected-party definitions and local-law perfection requirements at IRS.gov and with qualified legal counsel.

What are the ten IRC 6323(b) super-priority categories?

IRC 6323(b) (verify at IRS.gov and in current IRC text) provides ten categories of interests that have priority over a federal tax lien EVEN AFTER a valid Notice of Federal Tax Lien has been filed. The ten categories are: (1) certain obligatory disbursement agreements and advances; (2) retail purchasers of personal property in the ordinary course of business; (3) passbook loans -- financial institution loans secured by deposits at the same institution; (4) residential property purchasers of principal residences below the statutory threshold; (5) real property purchasers in foreclosure or execution sales; (6) real property tax and special assessment liens; (7) mechanic's liens for repair or improvement of residential or commercial real property in limited circumstances; (8) attorneys' charging liens on client judgments and settlements; (9) certain interests of beneficiaries and assignees of life insurance and endowment contracts; and (10) purchase money mortgages or deeds of trust given to secure the purchase price of property. Each category has specific conditions. Verify the exact terms and applicable dollar thresholds for each IRC 6323(b) category at IRS.gov and with qualified legal counsel before asserting a super-priority claim.

How does the 45-day rule work for commercial lenders under IRC 6323(c)?

IRC 6323(c) (verify at IRS.gov and in current IRC text) creates a special protection for commercial lenders who hold security interests in commercial financing assets -- specifically accounts receivable, inventory, and similar floating assets. Under IRC 6323(c), a security interest in such assets that was in place before the NFTL was filed continues to have priority over the federal tax lien for 45 days after the NFTL is filed, with respect to: (1) accounts receivable and inventory that come into existence during the 45-day window following the NFTL filing; and (2) proceeds of those receivables and inventory. This allows a commercial lender with a pre-existing blanket security interest to continue lending against a revolving borrowing base for 45 days after an NFTL is filed without losing priority to the IRS on those new advances and assets. After the 45-day window closes, the IRS takes priority over any new accounts receivable or inventory that come into existence. Commercial lenders must monitor NFTL filings against their borrowers and act swiftly within the 45-day window to preserve and document their priority position. Verify all current IRC 6323(c) conditions, the 45-day window calculation, and the definition of qualifying commercial financing assets at IRS.gov and with qualified legal counsel.

How do the NFTL filing location requirements under IRC 6323(f) work?

IRC 6323(f) (verify at IRS.gov and in current IRC text) specifies where the IRS must file the Notice of Federal Tax Lien to give effective constructive notice to third parties. For real property, the NFTL must be filed in the office designated by the law of the state in which the real property is located -- typically the county recorder, register of deeds, or county clerk. For personal property (whether tangible or intangible), the NFTL must be filed in the state in which the taxpayer resides at the time of filing. If the taxpayer does not reside in the United States, the NFTL must be filed in the District of Columbia. A critical trap: if the NFTL is filed in the wrong location -- for example, in the county of the taxpayer's old address rather than the county where the real property is located -- the filing may not provide the constructive notice required to defeat the rights of third parties under IRC 6323(a). A defectively filed NFTL may also affect the timing and applicability of the 45-day commercial financing window under IRC 6323(c). Verify all current IRC 6323(f) filing location rules and state-specific requirements at IRS.gov and with qualified legal counsel.

What is the practitioner's strategy when an NFTL blocks a real estate closing?

When a client's real estate transaction is blocked because a Notice of Federal Tax Lien appears in the title search, practitioners have several tools under the Code: (1) Lien discharge under IRC 6325(b) removes the lien from a specific property, either because the proceeds will be applied to the tax debt or because the remaining government interest is adequately protected by other collateral; this removes the cloud from title but the lien continues to attach to other property. (2) Lien subordination under IRC 6325(d) -- the IRS agrees to subordinate its lien to a specific third-party interest (such as a first mortgage or buyer's purchase-money lender); the closing proceeds while the IRS lien remains on the property, but junior to the subordinated interest. Subordination is often faster than discharge for real estate closings where new financing is involved. (3) Certificate of nonattachment under IRC 6325(e) -- if the IRS erroneously filed the lien against property that never belonged to the taxpayer. (4) CDP hearing under IRC 6320 -- the taxpayer who received an NFTL CDP Notice (Letter 3172) has a limited window to request a hearing; the CDP hearing does not stay NFTL enforcement but preserves administrative and Tax Court remedies. In each case, the CDP hearing rights must be preserved separately from the closing strategy. Verify all current IRC 6325 discharge and subordination procedures, Form 14135 requirements, and processing timelines at IRS.gov and with qualified legal counsel.

How does the federal tax lien interact with a taxpayer's bankruptcy?

The federal tax lien under IRC 6321 survives the filing of a bankruptcy petition with respect to property that was subject to the lien before the bankruptcy was filed. The automatic stay under 11 U.S.C. 362 (verify at the Bankruptcy Code) prevents the IRS from taking new collection actions, including new lien filings and levies, against property of the estate; however, the pre-petition NFTL that was validly filed before the bankruptcy continues to attach to the pre-petition property, including proceeds. Under the CSED tolling rules of IRC 6503(h), the CSED is tolled during the bankruptcy case plus 6 months; this directly extends the lien period under IRC 6322 by the same tolling duration. At discharge, certain tax debts may be discharged in bankruptcy (subject to the priority and dischargeability rules in the Bankruptcy Code), but a validly perfected lien on specific pre-petition property may survive even the discharge of the personal liability, encumbering the specific property in rem. Practitioners must coordinate IRC 6321-6323 lien analysis with Bankruptcy Code priority and dischargeability rules. Verify all current tax lien and bankruptcy interaction rules at IRS.gov and with qualified bankruptcy and tax counsel.

What is the difference between lien discharge, subordination, and withdrawal?

All three remedies under IRC 6325 release or limit the effect of a federal tax lien, but they are structurally distinct: (1) Discharge under IRC 6325(b) removes the lien from a specific piece of property entirely, so title to that property is no longer encumbered. The underlying tax debt and the lien on other property remain. Discharge is appropriate when selling a specific asset and applying proceeds to the tax debt, or when the IRS determines the government's interest in the property is adequately protected by other collateral. (2) Subordination under IRC 6325(d) leaves the lien in place on the property but causes it to be junior (subordinate) to a specific third-party interest, such as a first mortgage lender. The IRS lien remains on the property; it simply comes after the identified interest in priority. Subordination is the common tool for real estate closings where new financing is needed. (3) Withdrawal under IRC 6323(j) removes the NFTL filing from the public record entirely, as if it had not been filed. Withdrawal is appropriate where the NFTL was filed in error, where the taxpayer has entered into a direct debit installment agreement, or in other specific circumstances listed in IRC 6323(j). Withdrawal eliminates the public record of the lien filing; discharge and subordination leave the NFTL on file. Verify all current IRC 6325 discharge, subordination, and withdrawal procedures, Form requirements, and processing timelines at IRS.gov and with qualified legal counsel.

Federal Tax Lien Blocking a Closing or Business Transaction?

Americas Tax has represented clients in federal tax lien matters -- subordination requests, discharge applications, CDP hearings, and priority disputes -- for over 25 years. Our collection specialists understand the full IRC 6321-6323 framework and how to move quickly when a closing or business deal is at stake. Contact us for a practitioner-to-practitioner consultation.

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Regulated and Substantiated Claims -- Flagged for Compliance Review

Claim: "Americas Tax has represented clients in federal tax lien matters for over 25 years." -- Category: Experience/duration claim. Substantiation required: Confirm founding date and continuous lien representation history with Americas Tax management before page goes live.
Claim: IRC 6323(b)(4) residential property threshold of $500,000 -- Category: Dollar threshold from statute. Verify current statutory threshold at IRS.gov; threshold may be subject to adjustment.
Claim: All IRC statutory descriptions (IRC 6321, 6322, 6323 lien creation, duration, and priority rules) -- Category: Legal/regulatory description. All are accompanied by "verify at IRS.gov and in current IRC text" qualifiers throughout the page. No unqualified regulatory assertions are made without these qualifiers.
Claim: "Subordination is often faster than discharge for real estate closings" -- Category: Comparative process claim. Based on common practitioner experience; not a guarantee of processing time. Qualified with "often" throughout the page.
Claim: 45-day window under IRC 6323(c) -- Category: Statutory period. Verify current IRC 6323(c) text at IRS.gov to confirm the 45-day period has not been amended.

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Section 2 (IRC 6321): Targets "IRC 6321 lien for taxes secret lien assessment demand" and "secret lien" entity. After-acquired property subsection adds depth on a frequently searched practitioner question.
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Section 4 (IRC 6323): Targets "IRC 6323 validity priority against third parties" and "IRC 6323(a) four protected parties purchaser security interest." Section 4.2 introduces super-priority entity before the full table.
Section 5 (IRC 6323(c)): Targets "federal tax lien 45-day rule commercial financing." Amber callout adds practitioner-action depth for commercial lender readers.
Section 6 (IRC 6323(f)): Targets "NFTL filing requirements IRC 6323(f)." Red callout 2 highlights the defective-filing issue, a high-value practitioner question not covered by competitor content.
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Section 8 (Strategy): Transactional intent layer for practitioners searching for "NFTL blocks real estate closing" and OIC/CDP lien interaction questions. Internal links to discharge/subordination, CDP, OIC, and CSED guides support cluster authority.
FAQ (Section 9): Targets 10 practitioner questions aligned with secondary keywords and FAQ schema. 10 questions x 2 acceptedAnswer schema entries per FAQ item via JSON-LD = 20 total in schema (10 in JSON-LD block listed under mainEntity, each with one acceptedAnswer). Body FAQ adds 10 additional HTML questions for on-page depth, giving total FAQ depth exceeding the 8-question minimum.
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IRC 6321, 6322, and 6323: Federal Tax Lien Creation, Period, and Priority Framework -- Practitioner Guide