IRC 1400Z-2 Qualified Opportunity Zones: OZ 1.0, OZ 2.0 (OBBBA), and the 10-Year Exclusion Practitioner Guide

IRC 1400Z-2 is the statutory engine behind the Qualified Opportunity Zone (QOZ) program: one of the most consequential capital gains deferral and exclusion tools in the Internal Revenue Code. In 2026, practitioners face a dual-layer analysis. OZ 1.0, governed by the 2019 final regulations (TD 9899), continues to apply to existing QOF investments. OZ 2.0, created by the One Big Beautiful Act (OBBBA) enacted July 4, 2025, opens a new designation window and modifies certain investment rules; IRS Notice 2026-40 (June 2026) provides interim guidance, and final OZ 2.0 regulations have not been issued. This is a citation-anchored practitioner reference for enrolled agents, CPAs, and tax attorneys advising clients on QOF deferral mechanics, QOF compliance, the 10-year exclusion under IRC 1400Z-2(c), OBBBA OZ 2.0, and exit planning.

All statutory citations, regulatory references, and mechanics described in this guide must be verified against the current text of the Internal Revenue Code, Treasury Regulations (including TD 9899), the enacted OBBBA statute, IRS Notice 2026-40, and IRS.gov before being relied on in any specific client matter. Tax law is subject to legislative change and ongoing regulatory interpretation; any detail here may be superseded. OZ 2.0 mechanics in particular are subject to IRS guidance that had not been fully issued as of July 2026. This guide is for informational purposes only and does not constitute legal or tax advice.

Section 1: The OZ Program Framework -- What It Is and Why It Matters

Origins: TCJA 2017 and the Creation of the QOZ Program

The Tax Cuts and Jobs Act of 2017 (TCJA) created the Qualified Opportunity Zone program through IRC 1400Z-1 and IRC 1400Z-2. The legislative purpose was to incentivize long-term private investment in economically distressed communities by offering a package of federal capital gains tax benefits to investors who commit capital to Qualified Opportunity Funds (QOFs) that invest in designated census tracts. Governors nominated census tracts in their states, the Treasury Department certified the designations, and the original OZ map was published in 2018. Those original designations constitute what practitioners now call "OZ 1.0."

The TCJA framework under IRC 1400Z-2 created three distinct layers of tax benefit for investors who met the holding period requirements. In 2026, only one of those three layers (the 10-year exclusion) remains broadly available to both existing and new investors. The other two layers (the original deferral and the statutory step-ups) are either time-limited or their end-dates are subject to modification by OBBBA, as described in detail in Sections 2 and 4 of this guide.

The Three-Layer Tax Benefit Structure

The IRC 1400Z-2 framework offers investors three potential layers of federal tax benefit:

1. Deferral of the original capital gain: An investor who recognizes a capital gain and invests that gain in a QOF within 180 days may defer recognition of the gain until the earlier of: the date the QOF investment is sold or exchanged, or the applicable recognition date under IRC 1400Z-2(b)(1). Hedge the applicable recognition date to enacted OBBBA and IRS Notice 2026-40; OBBBA may have modified the original December 31, 2026 OZ 1.0 deferral end-date.
2. Partial basis step-ups on the deferred gain (now limited to prior investments): Under the original TCJA framework, a taxpayer who held a QOF investment for 5 years received a 10% step-up in basis on the deferred gain, and a taxpayer who held for 7 years received an additional 5% step-up (for a total of 15%). Because the 5-year step-up required investment by December 31, 2021 (to hit 5 years before the original December 31, 2026 recognition date), and the 7-year step-up required investment by December 31, 2019, these benefits are no longer available to new investors. They remain relevant only for investors who held qualifying positions on those dates; hedge any remaining step-up applicability to IRS.gov.
3. 10-year exclusion on QOF appreciation (IRC 1400Z-2(c), the primary continuing planning tool): If the QOF investment is held for at least 10 years, the taxpayer may elect to have the basis of the QOF interest equal to its FMV at the time of sale, resulting in zero gain recognized on all post-acquisition appreciation in the QOF. This is independent of the deferred gain, which remains taxable separately. The 10-year exclusion is the centerpiece of OZ planning in 2026 and is expected to continue under OZ 2.0; hedge OZ 2.0 continuation to enacted OBBBA and IRS Notice 2026-40.

OBBBA and the OZ 2.0 Expansion

OBBBA, enacted July 4, 2025, extended and expanded the QOZ program. What practitioners call "OZ 2.0" refers to the OBBBA expansion: new census tract designations, a new designation window that opened July 1, 2026, and modifications to certain investment rules. IRS Notice 2026-40, issued June 2026, provides interim guidance on OZ 2.0 mechanics pending final regulations. Final OZ 2.0 regulations had not been issued as of July 2026. All OZ 2.0-specific mechanics described in this guide are based on the enacted OBBBA statute and IRS Notice 2026-40; practitioners must confirm current rules at IRS.gov/opportunityzones before advising clients.

Section 2: Who Qualifies and How the Deferral Works (OZ 1.0 and OZ 2.0)

Eligible Gains: What Can Be Deferred

Under IRC 1400Z-2(a), the following types of gain qualify for deferral through a QOF investment:

• Short-term capital gains: Qualify for deferral under IRC 1400Z-2(a)(1). Note that although the gain is deferred, it retains its original character when recognized; a short-term capital gain deferred into a QOF is recognized as short-term capital gain on the applicable recognition date or earlier disposition, not as long-term capital gain. Hedge character retention to Treas. Reg. 1.1400Z2(b)-1.
• Long-term capital gains: Qualify in the same manner as short-term gains; retain long-term character when recognized.
• IRC 1231 gains: Section 1231 gains from the sale of business property qualify for OZ deferral, but only in a net IRC 1231 gain year (i.e., when total IRC 1231 gains exceed IRC 1231 losses for the year, causing the net amount to be treated as long-term capital gain). In a net IRC 1231 loss year, there is no capital gain to defer. Hedge IRC 1231 timing mechanics to Treas. Reg. 1.1400Z2(a)-1.
• Installment sale gains: If the underlying gain is from an installment sale under IRC 453, each installment payment may restart the 180-day clock as gain is recognized. Hedge installment sale interaction mechanics to Treas. Reg. 1.1400Z2(a)-1 and IRS.gov.

Ordinary income does not qualify for OZ deferral. Only capital gain (including IRC 1231 gain in a net gain year) is eligible. Practitioners must separately characterize the client's gain before determining the eligible deferral amount.

The 180-Day Investment Window

Under IRC 1400Z-2(a)(1), the investor must invest the deferred gain amount in a QOF within 180 days of the sale or exchange giving rise to the gain. This is an absolute statutory deadline. The 180-day period begins on the date of the sale or exchange, not on the date the taxpayer files a return or makes the deferral election. Missing the 180-day window eliminates the deferral opportunity entirely for that gain event.

The investor's cost basis in the QOF interest equals zero for the deferred gain portion at the time of investment. This zero basis steps up over the holding period (through the now-expired step-up provisions for early investors) and is ultimately stepped up to FMV upon the IRC 1400Z-2(c) election at exit after 10 years.

Pass-Through Entity Special Rules

When a capital gain arises at the level of a pass-through entity (partnership, S corporation, or trust), the 180-day window for the investor (partner, shareholder, or beneficiary) operates differently. Under IRC 1400Z-2(a)(1)(A) and Treas. Reg. 1.1400Z2(a)-1(b), the investor at the pass-through level may measure the 180-day window from the end of the pass-through entity's taxable year (rather than from the date of the underlying disposition). This provides additional planning flexibility because pass-through investors often receive K-1s after the underlying gain event and may not have the full capital to invest within 180 days of the actual disposition.

Alternatively, the investor may elect to use the 180-day window measured from the actual disposition date at the entity level. The election and its mechanics should be confirmed against Treas. Reg. 1.1400Z2(a)-1(b) before advising any client whose gain flows through a pass-through entity, as the specific rules are detailed and fact-specific.

Deferral Recognition: When Does the Deferred Gain Come Due?

Under IRC 1400Z-2(b)(1), the deferred gain is recognized on the earlier of:

1. The date the QOF investment is sold or exchanged (including certain inclusion events such as gifts, transfers of the QOF interest, and other dispositions; hedge inclusion event mechanics to Treas. Reg. 1.1400Z2(b)-1 and IRS.gov); or
2. The applicable recognition date under IRC 1400Z-2(b)(1). Under the original TCJA framework, this date was December 31, 2026. CRITICAL HEDGE: OBBBA may have modified or extended this date for OZ 1.0 investors and may establish a different date for OZ 2.0 investors. Practitioners must confirm the current applicable recognition date under enacted OBBBA and IRS Notice 2026-40 before advising clients on deferral planning. Do not treat December 31, 2026 as the definitive end-date without confirming whether OBBBA modified it.

When the deferred gain is recognized, it is recognized in full (subject to any applicable step-ups for early investors) and retains its original character (short-term capital gain, long-term capital gain, or IRC 1231 gain). The recognition of the deferred gain is separate from and does not affect the 10-year exclusion on QOF appreciation under IRC 1400Z-2(c).

The Basis Step-Up Provisions: Status as of 2026

The original TCJA framework included two statutory basis step-ups that reduced the amount of deferred gain recognized at the recognition date: a 10% step-up after a 5-year holding period, and an additional 5% step-up (for a total of 15%) after a 7-year holding period. Both step-ups were conditioned on the investor holding the QOF interest for the required period before the applicable recognition date. Because the original recognition date was December 31, 2026:

• The 7-year step-up required initial investment by December 31, 2019 (to reach 7 years by December 31, 2026).
• The 10% (5-year) step-up required initial investment by December 31, 2021 (to reach 5 years by December 31, 2026).

Both step-ups are no longer available to new investors. They are relevant only for investors who made qualifying QOF investments on or before December 31, 2021 (for the 5-year step-up) or December 31, 2019 (for the 7-year step-up). If OBBBA extended the applicable recognition date, the step-up mechanics may be further modified; hedge any remaining step-up calculations for prior-year investors to the enacted OBBBA text, IRS Notice 2026-40, and IRS.gov.

Section 3: QOF Requirements -- Structure and Compliance

Entity Requirements and Self-Certification

Under IRC 1400Z-2(d)(1), a QOF must be a corporation or partnership organized for the purpose of investing in Qualified Opportunity Zone Property (QOZP). The QOF self-certifies its status by filing IRS Form 8996 annually with its tax return. Form 8996 reports the QOF's compliance with the 90% asset test and calculates any applicable penalty for failure. The QOF does not obtain advance approval from the IRS; self-certification places the compliance burden entirely on the QOF and its investors.

Disregarded entities (single-member LLCs treated as disregarded for tax purposes) are not eligible to be QOFs; the QOF must be recognized as a separate entity for tax purposes (a corporation or a partnership with at least two members). All QOF self-certification and compliance mechanics should be confirmed against Treas. Reg. 1.1400Z2(d)-1 and IRS.gov before advising clients on QOF formation and ongoing compliance.

The 90% QOZP Test

Under IRC 1400Z-2(d)(1), at least 90% of the QOF's total assets must be QOZP, measured on the last day of the first 6-month period of the QOF's taxable year and on the last day of the taxable year. The 90% test is applied to the QOF's total assets by value. If the QOF fails the 90% test for any measurement date, IRC 1400Z-2(f) imposes a monthly penalty on the shortfall amount. Hedge the current penalty rate to IRC 1400Z-2(f) and IRS.gov.

The 90% test creates a significant compliance discipline for QOFs: cash held pending deployment into QOZP counts against the test unless the QOF qualifies for the working capital safe harbor described below. Practitioners advising QOF sponsors must build a compliance monitoring schedule around the two annual measurement dates.

QOZP Categories

Under IRC 1400Z-2(d)(2), QOZP includes three categories, each with distinct requirements:

1. Qualified Opportunity Zone Stock (QOZS): Stock in a domestic corporation that qualifies as a QOZ Business, acquired by the QOF after December 31, 2017, at original issue in exchange for cash, and meeting additional requirements. Hedge all QOZS requirements to IRC 1400Z-2(d)(2)(B) and TD 9899.
2. Qualified Opportunity Zone Partnership Interests (QOZPI): Capital or profits interests in a domestic partnership that qualifies as a QOZ Business, acquired by the QOF after December 31, 2017, in exchange for cash, and meeting additional requirements. Hedge all QOZPI requirements to IRC 1400Z-2(d)(2)(C) and TD 9899.
3. Qualified Opportunity Zone Business Property (QOZBP): Tangible property used in a trade or business of the QOF (or QOZ Business) that meets the original use or substantial improvement requirement described below. Hedge all QOZBP requirements to IRC 1400Z-2(d)(2)(D) and TD 9899.

All category-specific requirements for QOZS, QOZPI, and QOZBP should be confirmed against IRC 1400Z-2(d), the final regulations (TD 9899), IRS Notice 2026-40, and IRS.gov before advising clients on specific QOF structures. OZ 2.0 may modify certain QOZP requirements; hedge all OZ 2.0 QOZP differences to IRS Notice 2026-40.

Original Use or Substantial Improvement for QOZBP

Under IRC 1400Z-2(d)(2)(D)(ii), QOZBP must satisfy either the original use requirement or the substantial improvement requirement:

• Original use: The original use of the property in the QOZ must commence with the QOF or QOZ Business. Property with a prior depreciable history in the QOZ does not qualify under the original use prong.
• Substantial improvement: Additions to the basis of the property made by the QOF or QOZ Business within any 30-month period must exceed the property's original basis (the basis at the time the QOF or QOZ Business acquired it). In practical terms, the investor must double the basis of the acquired property within 30 months through capital improvements. Hedge the specific mechanics of the substantial improvement test to IRC 1400Z-2(d)(2)(D)(ii), TD 9899, and IRS.gov.

Bare land has been treated differently under the regulations; practitioners advising on land-intensive OZ deals should confirm current treatment under TD 9899 and any OZ 2.0 modifications under IRS Notice 2026-40.

QOZ Business Requirements

Under IRC 1400Z-2(d)(3), a QOZ Business must meet all of the following requirements:

• At least 70% of the tangible property owned or leased by the business must be QOZBP.
• The business must be in the active conduct of a trade or business (the "active conduct" requirement).
• Less than 5% of the aggregate unadjusted basis of the business's property may consist of nonqualified financial property (under IRC 1400Z-2(d)(3)(A)(iii)).
• The business may not be a golf course, country club, massage parlor, hot tub facility, suntan facility, racetrack or other gambling facility, or liquor store (under IRC 1400Z-2(d)(3)(A)(iv) and related provisions).

All QOZ Business qualification mechanics should be confirmed against IRC 1400Z-2(d)(3), the final regulations (TD 9899), and IRS Notice 2026-40 for any OZ 2.0 modifications.

Working Capital Safe Harbor

The final regulations under Treas. Reg. 1.1400Z2(d)-1(c)(4)(ii) provide a working capital safe harbor that allows QOF-funded QOZ Businesses to hold cash and cash equivalents for up to 31 months without those assets being treated as nonqualified financial property. To qualify for the safe harbor, the QOZ Business must have a written plan designating the financial property for the acquisition, construction, or improvement of tangible property in the QOZ, a written schedule for deployment of the property consistent with that plan, and must actually use the financial property consistent with the plan and schedule.

The working capital safe harbor is critical for development-stage OZ deals where capital is raised before construction or improvement activity can begin. Hedge all safe harbor mechanics, including extensions and stacking of consecutive 31-month periods in certain circumstances, to Treas. Reg. 1.1400Z2(d)-1(c)(4)(ii) and IRS.gov.

Section 4: The 10-Year Exclusion -- The Primary Planning Tool

How the IRC 1400Z-2(c) Election Works

Under IRC 1400Z-2(c), if a taxpayer holds a QOF investment for at least 10 years and then disposes of the investment, the taxpayer may elect to have the adjusted basis of the QOF interest equal to its fair market value (FMV) at the time of disposition. This election effectively steps up the investor's basis in the QOF interest from its actual tax basis (which may be zero or very low, depending on the initial investment and any prior step-ups) to full FMV.

The result: because the investor's basis equals FMV at the time of sale, no gain is recognized on the QOF investment itself. All post-acquisition appreciation in the QOF (the value the QOF has built above the investor's original investment) is permanently excluded from gross income. The exclusion applies regardless of the character of the appreciation; under the IRC 1400Z-2(c) regime, the excluded gain is not reported and is not subject to federal income tax or, for the excluded portion, the net investment income tax. Hedge all exclusion mechanics to IRC 1400Z-2(c) and Treas. Reg. 1.1400Z2(c)-1.

What Is Excluded vs. What Remains Taxable

The 10-year exclusion under IRC 1400Z-2(c) applies only to the appreciation in the QOF investment itself, not to the original deferred capital gain. These are two separate and distinct tax items:

• The original deferred gain (TAXABLE when recognized): The gain that was deferred by the original QOF investment is recognized on the earlier of: the date of disposition of the QOF interest, or the applicable recognition date under IRC 1400Z-2(b)(1) (hedge to enacted OBBBA and Notice 2026-40). The deferred gain retains its original character and is not excluded by the IRC 1400Z-2(c) election. An investor who deferred a $500,000 capital gain still owes tax on that $500,000 (less any applicable step-ups for early investors) when it is recognized.
• QOF appreciation above the original investment (EXCLUDED after 10 years): If the QOF investment grows from $500,000 (the original investment) to $2,000,000 over 12 years, the $1,500,000 of appreciation is excluded from gross income under the IRC 1400Z-2(c) election. The taxpayer recognizes zero gain on that $1,500,000 appreciation.

This structure means that the net after-tax economics of an OZ investment depend on two separate calculations: (1) the tax cost of the original deferred gain when it is recognized (timing and rate matters), and (2) the tax-free compounding of the QOF appreciation over the holding period. For investors in QOFs with strong appreciation, the combination of deferral and the 10-year exclusion can be a powerful wealth-building tool even with the deferred gain tax remaining.

Holding Period Calculation and the Timing Window

The 10-year holding period for purposes of IRC 1400Z-2(c) is measured from the date of the original QOF investment. For OZ 1.0 investors who invested in 2018, 2019, 2020, or 2021, the respective 10-year periods expire in 2028, 2029, 2030, and 2031. These investors are entering or approaching the 10-year window in 2026, which makes exit planning a current priority.

Importantly, the 10-year exclusion does not expire at the 10-year mark. Under the existing final regulations, investors may hold the QOF investment beyond 10 years and still make the IRC 1400Z-2(c) election at a later exit date. Hedge the specific mechanics of this extension to Treas. Reg. 1.1400Z2(c)-1. This flexibility is significant because it allows investors to exit when market conditions are favorable rather than being forced out at exactly the 10-year mark.

Exit Mechanics: The Tax-Free Exit Structure

At exit after 10 years, the mechanics work as follows:

1. The taxpayer disposes of the QOF interest in a taxable transaction.
2. The taxpayer makes the IRC 1400Z-2(c) election on the tax return for the year of disposition (hedge election mechanics to Treas. Reg. 1.1400Z2(c)-1).
3. The adjusted basis of the QOF interest is treated as equal to FMV at the time of disposition.
4. Because basis equals FMV, no gain or loss is recognized on the QOF interest itself.
5. Separately, the taxpayer recognizes the original deferred gain (if not already recognized on the applicable recognition date) and pays the corresponding tax.

The net result is that the investor pays tax only on the original deferred gain (at the applicable rate and in the applicable year of recognition), while all of the QOF's operating appreciation passes to the investor federal-income-tax free. Hedge all exit mechanics to IRC 1400Z-2, IRC 1400Z-2(c), and Treas. Reg. 1.1400Z2(c)-1.

Section 5: OBBBA OZ 2.0 -- What We Know from Notice 2026-40

OBBBA and the OZ 2.0 Framework

OBBBA, enacted July 4, 2025, extended and expanded the Opportunity Zone program beyond its original TCJA framework. The expansion -- commonly called OZ 2.0 -- is not merely an extension of the original designation list; it creates a new round of census tract designations, a new designation process, and potentially modified investment rules under OBBBA. The new designation window opened July 1, 2026 per the enacted legislation.

The designation process under OZ 2.0 involves governors submitting new census tract nominations for certification, as it did under OZ 1.0, but with modifications to the designation criteria and process under OBBBA. Do not state specific designated OZ 2.0 census tracts as fact; the designated tracts are determined under the enacted legislation and the governor nomination and Treasury certification process. Confirm the current list of designated OZ 2.0 tracts at IRS.gov/opportunityzones before advising clients.

OZ 2.0 vs. OZ 1.0: Key Differences Under OBBBA

Based on the enacted OBBBA statute and IRS Notice 2026-40, OZ 2.0 differs from OZ 1.0 in certain respects. Because final regulations have not been issued, the specific mechanics of these differences must be hedged entirely to IRS Notice 2026-40 and IRS.gov. In general terms, the OBBBA OZ 2.0 expansion includes:

• New census tract designations: New QOZ tracts designated under the OBBBA process; different from the original OZ 1.0 designated tracts under the 2018 TCJA designation process. Confirm current OZ 2.0 designated tracts at IRS.gov/opportunityzones.
• Modified QOZP requirements: OBBBA may have modified the QOZP requirements for OZ 2.0 investments. Confirm all OZ 2.0 QOZP-specific rules under IRS Notice 2026-40 and any subsequent IRS guidance before advising clients on OZ 2.0 QOF structures.
• Potential modifications to the 180-day window and investment requirements: OBBBA and Notice 2026-40 may include modifications to the investment window and eligibility requirements for OZ 2.0. Hedge all OZ 2.0-specific modifications to Notice 2026-40 and IRS.gov.
• Deferral period end-date: The applicable recognition date for OZ 2.0 investors may differ from the OZ 1.0 date. Do not state the OZ 2.0 deferral period end-date definitively; confirm under enacted OBBBA and Notice 2026-40.

QPP and QOZBP Interaction Under OBBBA

OBBBA introduced 100% expensing for Qualified Production Property (QPP) under IRC 168(n). For OZ 2.0 investments in QOZBP, the QPP expensing rules may interact with the QOZBP substantial improvement requirement and basis analysis in ways that alter the economics of OZ 2.0 deals relative to OZ 1.0. Specifically, if QOZBP qualifies for QPP 100% expensing, the basis implications for the QOZBP test and the QOZ Business asset calculations may require careful analysis.

Hedge all QPP and QOZBP interaction mechanics to enacted OBBBA (IRC 168(n)), IRS Notice 2026-40, and IRS.gov. Final guidance on the QPP/QOZBP interaction had not been issued as of July 2026. Practitioners advising clients on OZ 2.0 deals involving real property or other potentially QPP-eligible assets must monitor IRS.gov/opportunityzones and the OBBBA regulatory guidance pipeline for current rules.

Where to Confirm Current OZ 2.0 Status

For current OZ 2.0 guidance, designated tract listings, and any IRS notices or regulations issued after IRS Notice 2026-40, practitioners should check the following sources before advising clients:

• IRS.gov/opportunityzones: The IRS's primary landing page for QOZ program guidance, designated zone listings, and interim guidance documents including IRS Notice 2026-40.
• The enacted OBBBA statute: The primary legislative source for OZ 2.0 mechanics; practitioners should read the actual statutory text before relying on any summary.
• IRS Notice 2026-40 (June 2026): The current interim guidance document on OZ 2.0; covers OZ 2.0 mechanics pending final regulations.
• Treasury and IRS regulatory pipeline: Final OZ 2.0 regulations are expected to be issued; monitor the Federal Register and IRS.gov for updates.

Section 6: State Tax Treatment -- The Conformity Trap

Federal OZ Treatment Does Not Apply Automatically at the State Level

One of the most significant and frequently overlooked risks in OZ planning is state income tax non-conformity. The federal OZ deferral under IRC 1400Z-2(a) and the federal 10-year exclusion under IRC 1400Z-2(c) do not automatically apply for state income tax purposes. Each state independently determines whether and to what extent it conforms to the federal QOZ provisions. For clients in non-conforming states, the OZ investment that defers federal income tax may simultaneously trigger full state income tax recognition on the gain -- immediately, with no deferral.

California and New York: Non-Conforming States

California does not conform to the federal OZ deferral or exclusion. A California resident or California-source gain taxpayer who invests in a QOF within 180 days and defers the gain for federal purposes must still recognize and pay California income tax on the full gain in the year of the triggering sale. California's top marginal income tax rate on capital gains (which California taxes as ordinary income) is among the highest in the country, making the state non-conformity a material factor in net OZ economics for California investors.

New York similarly does not conform to the federal QOZ provisions. New York resident taxpayers and New York-source gain taxpayers face immediate state (and New York City, for NYC residents) income tax recognition on the full gain that is deferred for federal purposes. For taxpayers subject to both state and city income tax in New York City, the combined non-conformity cost can be substantial.

For state residency and domicile analysis affecting New York taxpayers' state income tax exposure, including the statutory residency rules and the 183-day rule that can create dual-state income tax obligations, see the state income tax residency and domicile practitioner guide.

Hedge all California-specific QOZ treatment to the California Franchise Tax Board (CA FTB), including any FTB publications or guidance on conformity or non-conformity. Hedge all New York-specific QOZ treatment to the New York State Department of Taxation and Finance (NY DTF) and, for New York City residents, to the NYC Finance Department. State tax authorities' positions on OZ conformity are subject to change; confirm current state conformity status at the applicable state tax authority before advising clients.

Other States: Conformity Varies Widely

Beyond California and New York, state conformity to the federal OZ provisions varies widely. Some states conform fully (adopting the federal deferral and exclusion), some conform partially (e.g., conforming to the deferral but not the exclusion), and others do not conform at all. States that use federal adjusted gross income (AGI) or federal taxable income as the starting point for state income tax calculations may have a structural conformity that pulls in the federal OZ deferral, but practitioners should not assume conformity without confirming the specific state's position.

Practitioners must analyze the state income tax treatment of an OZ investment for every client in a state with a personal income tax. The net economics of an OZ deal must account for the after-state-tax cost, and in high-tax non-conforming states, that calculation can significantly reduce or even eliminate the apparent federal-level benefit of the deferral.

Frequently Asked Questions: IRC 1400Z-2 Qualified Opportunity Zones

Related Practitioner Guides

Qualified Opportunity Zone planning intersects with several other capital formation, deferral, and estate planning provisions. The following guides address companion areas of analysis:

• IRC 1031 Like-Kind Exchange and Qualified Intermediary Practitioner Guide -- QOZ deferral and IRC 1031 like-kind exchanges are the two primary capital gains deferral strategies available to taxpayers selling appreciated property. Practitioners comparing the two strategies must understand the key differences: IRC 1031 defers gain through like-kind replacement property while IRC 1400Z-2 defers gain through a QOF investment and offers the 10-year exclusion on appreciation. The choice between the two (or a combination strategy) depends on the client's property type, holding period goals, and available replacement or QOZ investment options.
• IRC 1202 QSBS Qualified Small Business Stock OBBBA Practitioner Guide -- IRC 1202 QSBS and the QOZ program are companion capital formation incentives created and expanded under the same legislative frameworks (TCJA and OBBBA). Practitioners advising startup founders and early investors must understand both: QSBS excludes gain from qualifying small business stock after a 5-year holding period, while the QOZ program defers and ultimately excludes gain from QOF appreciation after a 10-year holding period. The two provisions can be deployed together in certain structures; confirm interaction mechanics with qualified counsel.
• Form 706 Estate Tax Return, Portability, and DSUE Practitioner Guide -- High-basis QOF interests held until death can be a powerful estate planning tool. After the 10-year exclusion is available, a QOF interest with substantial appreciation may be included in a decedent's estate at FMV, potentially achieving a stepped-up basis for estate tax purposes while the appreciation has been excluded from income tax during the holding period. The interaction of the IRC 1400Z-2(c) election, estate tax inclusion, and OBBBA's permanent unified credit expansion creates planning opportunities that require analysis under both the income tax and estate tax frameworks.
• State Income Tax Residency, Domicile, and the 183-Day Rule Practitioner Guide -- For taxpayers in New York and other states with complex residency and domicile rules, the state income tax treatment of an OZ investment depends not only on state conformity but also on the taxpayer's state of residency and the source of the gain. New York's statutory residency rules and the 183-day rule can create unexpected state income tax obligations that affect OZ planning; this guide covers the residency and domicile analysis that must accompany any state income tax conformity analysis for New York-connected taxpayers.
• Qualified Opportunity Zone Form 8997 gain recognition reporting guide -- Form 8997 is the annual information return every QOF investor must file to report initial and remaining deferred gains, current-year QOF investments, and gains recognized during the year. This companion guide covers the gain recognition tracking mechanics and the 2026 reporting requirements that accompany the OZ deferral and 10-year exclusion elections discussed here.