What types of events qualify as involuntary conversions under IRC 1033?

IRC 1033 applies to gains realized from involuntary conversions resulting from destruction (in whole or in part), theft, seizure, requisition or condemnation, and the threat or imminence of condemnation (IRC 1033(a)(2)(A)). A sale made to a government entity under official notice of condemnation proceedings generally qualifies as a sale under "threat or imminence" of condemnation. However, informal expressions of government interest in acquiring the property generally do not qualify; there must be a reasonable basis for believing that the property would actually be condemned if not sold. The determination is fact-specific; hedge to Treas. Reg. 1.1033(a)-2(c)(1) and applicable case law.

What is the "similar or related in service or use" test and how does it differ from like-kind?

The "similar or related in service or use" test (for casualty, theft, and non-condemnation conversions) requires the replacement property to serve the same function in the taxpayer's business or investment activities as the converted property. This is stricter than the IRC 1031 "like kind" standard. For example, replacing a destroyed warehouse with an office building likely fails the "similar or related" test. However, under IRC 1033(g), when real property used in a trade or business or held for investment is condemned (or sold under threat of condemnation), the taxpayer may replace with any "like kind" real property (the broad IRC 1031 standard), which allows much greater flexibility in the replacement choice.

How long does a taxpayer have to replace involuntarily converted property?

The general replacement period is 2 years after the close of the taxable year in which gain is first realized (IRC 1033(a)(2)(B)(i)). For real property condemnations under IRC 1033(g), the period extends to 3 years (IRC 1033(g)(4)). For principal residences in federally declared disaster areas, a 4-year period may apply under IRC 1033(h)(1)(B). The IRS also has authority to extend the replacement period on written application (IRC 1033(a)(2)(B)(ii)), and routinely grants extensions in complex condemnation cases. Rev. Proc. 2025-41 and current IRS.gov disaster guidance provide information on automatic extensions for specific federally declared disasters.

Is the IRC 1033 election mandatory or optional?

For conversions where the property is directly converted into similar replacement property (IRC 1033(a)(1)), nonrecognition is mandatory if no cash is realized. For conversions into money (insurance proceeds, condemnation awards, sales under threat of condemnation), the election (IRC 1033(a)(2)) is optional: the taxpayer may choose to recognize the gain (for example, to use available NOL carryforwards) or elect to defer it. The election is made on the return for the year gain is first realized, but an amended return may be filed to claim nonrecognition if the replacement property is purchased within the replacement period and within the time period for amending the original return.

How does the basis of replacement property work under IRC 1033?

The basis of the replacement property is its cost minus the amount of gain that was not recognized (the deferred gain) under IRC 1033(b). This reduced basis ensures the deferred gain is preserved for future recognition when the replacement property is sold. For example, if the taxpayer received $500,000 from a casualty loss, had $200,000 of realized gain, elected IRC 1033 nonrecognition, and purchased replacement property for $500,000, the basis of the replacement property would be $300,000 ($500,000 cost minus $200,000 deferred gain). When the replacement property is later sold, the $200,000 deferred gain (and any additional appreciation) will be recognized.

How does OBBBA bonus depreciation interact with an IRC 1033 election?

When the replacement property is Qualified Production Property (QPP) eligible for OBBBA's 100% bonus depreciation, the reduced basis from the IRC 1033 election means the taxpayer can only claim bonus depreciation on the reduced basis (cost minus deferred gain), not the full cost. This effectively gives back part of the IRC 1033 tax benefit via lower first-year depreciation deductions. Practitioners should model both paths: (a) elect IRC 1033 nonrecognition, deferring the gain but receiving less bonus depreciation; versus (b) recognizing the gain in the year of conversion, paying tax on the gain but receiving full bonus depreciation on the entire replacement cost. The better result depends on the taxpayer's tax rates, available loss carryforwards, and replacement period timing. Hedge all OBBBA QPP mechanics to enacted OBBBA and IRS.gov.

What happens if a taxpayer does not find replacement property within the replacement period?

If qualifying replacement property is not purchased within the replacement period (and no IRS extension is granted), the gain is recognized in the taxable year in which the replacement period expires, not the year of the original conversion. The taxpayer must then report the previously deferred gain on their return for that later year. This can result in a surprise tax liability in a year when the taxpayer may not have anticipated it. Practitioners should calendar the replacement period deadline and alert clients well in advance. If a replacement is unlikely to be found in time, the taxpayer should promptly apply for an extension of the replacement period (IRC 1033(a)(2)(B)(ii)) before the period expires.

IRC 1033 Involuntary Conversion: Replacement Period OBBBA

Qualifying Involuntary Conversions and the "Threat or Imminence" Rule

IRC 1033 applies to a defined set of involuntary conversion events. Understanding which events qualify, and precisely when the clock starts, is the first step in any IRC 1033 analysis.

Complete list of qualifying events

Under IRC 1033, gain realized from an involuntary conversion is eligible for nonrecognition treatment if the conversion results from any of the following:

Destruction (in whole or in part), including fire, storm, flood, and other casualty losses
Theft of the property
Seizure of the property by a government authority
Requisition or condemnation by a government authority
Threat or imminence of condemnation IRC 1033(a)(2)(A), which extends the rule to sales made before formal condemnation proceedings are completed

The mechanical framework governing IRC 1033(a) nonrecognition is detailed in Treas. Reg. 1.1033(a)-2. Practitioners should consult that regulation for the full procedural and definitional standards.

The "threat or imminence of condemnation" rule

The "threat or imminence" language in IRC 1033(a)(2)(A) is one of the most valuable and most litigated aspects of the statute. A taxpayer who sells property to a government entity after receiving official notice of condemnation proceedings, but before formal condemnation is completed, may qualify for IRC 1033 treatment on that sale. This matters because a voluntary sale can generate more favorable economics than a forced condemnation award.

Hedge required: Whether a particular communication from a government entity rises to the level of "threat or imminence" is highly fact-specific. The IRS and courts have consistently held that an informal indication of government interest in acquiring property does not meet the "threat or imminence" standard. The taxpayer must have reasonable grounds to believe the property would actually be condemned if not sold. For the controlling standards, hedge to Treas. Reg. 1.1033(a)-2(c)(1) and applicable case law; do not advise a taxpayer that a sale qualifies under the "threat or imminence" standard without a fact-specific analysis.

Partial destruction

If only a portion of a property is involuntarily converted, the gain attributable to the converted portion may still qualify for IRC 1033 nonrecognition. The partially converted property must be sufficiently identified and the proceeds must be allocated specifically to the converted portion. General property insurance proceeds that cover the entire property (rather than a specific asset) require careful allocation to determine which portion, if any, relates to the converted portion. Hedge the partial destruction analysis to Treas. Reg. 1.1033(a)-2 and IRS.gov.

Insurance proceeds and measuring gain

Insurance proceeds received as compensation for an involuntary conversion qualify as conversion proceeds under IRC 1033. The "gain realized" is the excess of the insurance proceeds (or other conversion proceeds) over the taxpayer's adjusted basis in the converted property. If the property had been fully depreciated, the entire insurance recovery may constitute gain, the character of which depends on the property's tax attributes (capital gain, Section 1245 ordinary income, or Section 1250 unrecaptured gain). Hedge the gain computation and insurance proceeds treatment to Treas. Reg. 1.1033(a)-2 and IRS.gov.

The Replacement Property Test: Similar or Related vs. Like Kind

The single most common source of IRC 1033 planning errors is misapplying the replacement property standard. There are two different tests, and which one applies depends on the type of involuntary conversion event.

The strict "similar or related in service or use" standard

For casualty, theft, and non-condemnation conversions, the replacement property must be "similar or related in service or use" to the converted property IRC 1033(a). This is a materially stricter standard than the IRC 1031 "like kind" test. The IRS has applied two different analytical frameworks depending on the taxpayer's relationship to the converted property:

Framework	Who it applies to	How similarity is measured	Practical example
Owner-User Test	Taxpayers who use the property directly in their business or personal affairs (not as a lessor)	The replacement must serve the same type of use in the taxpayer's business; the functional use comparison is from the taxpayer's perspective as an operator	A bakery's oven destroyed by fire: the replacement oven qualifies; a commercial refrigerator likely does not
Investor-Lessor Test	Taxpayers who lease or rent the converted property to others	The focus is on the nature of the services the TAXPAYER receives from the property as an investor (not the end use of the tenant); broader substitutability may be permitted	An apartment building destroyed by fire: replacement with another residential rental property likely qualifies; replacement with a warehouse or office building is more fact-specific and should be hedged to Treas. Reg. 1.1033(a)-2 and case law

The "similar or related in service or use" determination is highly fact-specific in both frameworks. Hedge all such determinations to Treas. Reg. 1.1033(a)-2 and applicable case law before advising a client that a proposed replacement qualifies.

The IRC 1033(g) like-kind exception for real property condemnations

When real property held for productive use in a trade or business or held for investment is condemned (or sold under threat or imminence of condemnation), IRC 1033(g)(1) allows the taxpayer to use the broader IRC 1031 "like kind" standard rather than the stricter "similar or related" test. This is a significant planning advantage for business and investment real property.

Under the current (post-TCJA) like-kind standard, any U.S. real property qualifies as "like kind" to any other U.S. real property. A condemned downtown office building can therefore be replaced with a rural industrial facility, a net-lease retail property, or undeveloped land, provided the replacement is U.S. situs real property. For the current definition of "like kind" for real property, hedge to IRC 1031 and Treas. Reg. 1.1031. For detailed mechanics on the like-kind exchange framework, including qualified intermediary requirements that may apply in certain structures, see our IRC 1031 Like-Kind Exchange and Qualified Intermediary Practitioner Guide.

Important limitation: The IRC 1033(g) like-kind expansion applies ONLY to real property condemnations. Personal property that is condemned (or otherwise involuntarily converted) does NOT qualify for the expanded like-kind standard; the stricter "similar or related in service or use" test applies. Additionally, following TCJA, personal property like-kind exchanges under IRC 1031 are no longer available, so there is no longer a personal property like-kind standard to import into IRC 1033(g). The IRC 1033(g) like-kind expansion is therefore exclusively a real property rule.

Geographic requirement for IRC 1033(g) replacements

For replacements qualifying under IRC 1033(g)'s like-kind standard, the replacement property must be U.S. situs real property. Foreign real property does not qualify as "like kind" to U.S. real property under the post-TCJA rules. This geographic limitation follows directly from IRC 1031(h), which is imported by reference into the IRC 1033(g) like-kind standard. Hedge the geographic requirements to current IRC 1031(h) and Treas. Reg. 1.1031.

Common replacement property pitfalls

Replacing a casualty-destroyed rental house with vacant land: likely fails the "similar or related in service or use" standard for a casualty conversion unless the taxpayer can demonstrate the land serves the same investor function; would qualify under IRC 1033(g) only if the property was condemned rather than destroyed
Replacing a condemned office building with a residential rental: may qualify under IRC 1033(g)'s like-kind standard (both are U.S. real property), provided the original property was held for investment or in a trade or business and the condemnation event qualifies
Replacing a factory fire loss with a commercial warehouse: fact-specific under the "similar or related" standard; apply both the owner-user and investor-lessor frameworks and hedge to applicable case law before advising the client
Replacement with property outside the U.S.: does not satisfy the geographic requirement for IRC 1033(g) replacements; the foreign property cannot be like kind to U.S. real property under current law

The Replacement Period and Timing Rules

The replacement period is a hard deadline. Missing it converts a deferred gain into recognized gain in the year the period expires. Calendaring this deadline and monitoring it throughout the engagement is a core practitioner responsibility.

The general 2-year replacement period

Under IRC 1033(a)(2)(B)(i), the taxpayer must purchase qualifying replacement property within 2 years after the close of the taxable year in which any part of the gain is FIRST REALIZED. The measurement point is the close of the taxable year, not the date of the actual conversion event. For a calendar-year taxpayer whose property is destroyed in March 2025 with gain first realized in 2025, the replacement period runs through December 31, 2027 (two years after December 31, 2025).

Conversion type	Applicable period	Authority	Starting point
General rule (casualty, theft, personal property condemnation)	2 years after close of taxable year in which gain is first realized	IRC 1033(a)(2)(B)(i)	Close of taxable year of first realized gain
Real property condemnation (IRC 1033(g))	3 years after close of taxable year in which gain is first realized	IRC 1033(g)(4)	Close of taxable year of first realized gain
Principal residence in federally declared disaster area	Up to 4 years from close of taxable year in which gain is first realized	IRC 1033(h)(1)(B)	Close of taxable year of first realized gain (hedge to IRS.gov for qualifying disasters)
IRS-granted extension (application required)	Extended period as approved in writing by the IRS	IRC 1033(a)(2)(B)(ii)	End of otherwise applicable replacement period

The 3-year period for real property condemnations

When IRC 1033(g) applies (real property condemned from a trade or business or investment), IRC 1033(g)(4) extends the replacement period to 3 years after the close of the taxable year in which gain is first realized. The starting date measurement is identical to the general rule; only the length of the period changes. For many complex commercial condemnations, where the taxpayer must identify, negotiate, and close on a large replacement asset, the additional year is operationally significant.

Disaster area extensions under IRC 1033(h)

For the involuntary conversion of a principal residence (and its contents) located in a federally declared disaster area, IRC 1033(h)(1)(B) provides for an extended replacement period of up to 4 years from the close of the taxable year in which the gain is first realized. Additional IRS procedures for disaster-related replacement period extensions are provided by Rev. Proc. 2025-41 and related guidance. The list of qualifying federally declared disasters, and the precise extension terms applicable to each, changes frequently.

Hedge required: Do not advise a client on the specific disaster extension available for a particular federally declared disaster without confirming the current IRS disaster relief guidance at IRS.gov and the terms of Rev. Proc. 2025-41 (and any superseding or modifying guidance). The rules applicable to a specific disaster, including which extensions are automatic versus requiring application, are outside the scope of this guide to enumerate and may change after publication.

IRS authority to extend the replacement period

Independent of the disaster area rules, the IRS has express statutory authority under IRC 1033(a)(2)(B)(ii) to extend the replacement period on a written application by the taxpayer. The IRS routinely grants such extensions in cases involving large commercial condemnations, complex replacement property searches, or other circumstances that make timely replacement impracticable. Taxpayers should apply well before the replacement period expires; the IRS will generally not grant a retroactive extension after the period has lapsed. Hedge the application procedure and requirements to the applicable Rev. Proc. and IRS.gov.

What happens when the replacement period expires without replacement

If a taxpayer defers gain under IRC 1033 election but fails to purchase qualifying replacement property before the replacement period expires (and no IRS extension was obtained), the previously deferred gain is recognized in the taxable year in which the replacement period EXPIRES, not the year of the original conversion. This timing rule can create a surprise tax liability in a later year when the taxpayer has not set aside funds for it.

Practice point: Practitioners should calendar every IRC 1033 replacement period deadline at the outset of the engagement and set reminder alerts well in advance of expiration, giving clients adequate time to either locate qualifying replacement property or submit a timely extension application under IRC 1033(a)(2)(B)(ii). A missed deadline is one of the most avoidable IRC 1033 errors.

The Election, Basis Mechanics, and Section 1245 Recapture Carryover

Mandatory vs. elective nonrecognition

IRC 1033 provides two distinct nonrecognition paths:

IRC 1033(a)(1) -- mandatory nonrecognition: When property is DIRECTLY converted into similar replacement property (no cash is realized), gain nonrecognition is mandatory. This occurs, for example, when a government authority takes property and immediately replaces it with other property rather than paying a cash award.
IRC 1033(a)(2) -- elective nonrecognition: When property is converted into money (insurance proceeds, a condemnation award, or proceeds from a sale under threat of condemnation), the taxpayer may ELECT to defer gain recognition by purchasing qualifying replacement property within the replacement period. The election is made on the return for the year in which gain is first realized.

Because the IRC 1033(a)(2) election is optional, taxpayers have the opportunity to compare the deferral benefit against the cost of recognizing the gain now (for example, when the taxpayer has large NOL or capital loss carryforwards that could offset the gain at zero additional tax cost). The election should never be reflexively assumed to be beneficial; run the full comparison. The election and amended return mechanics are detailed in Treas. Reg. 1.1033(a)-2(c).

Amended return availability

If the taxpayer reported and paid tax on the gain in the year of conversion (perhaps because the replacement property had not yet been identified), an amended return may be filed to claim IRC 1033 nonrecognition, provided: (a) qualifying replacement property is purchased within the replacement period; and (b) the amended return is filed within the statutory period for amending the original return. Practitioners should track both deadlines simultaneously. Hedge the amended return mechanics to Treas. Reg. 1.1033(a)-2(c) and IRS.gov.

Partial reinvestment: recognizing the unreinvested portion

The IRC 1033 deferral applies only to the portion of conversion proceeds that is actually reinvested in qualifying replacement property. If the taxpayer reinvests only part of the proceeds, the unreinvested portion is recognized as gain in the year of conversion, up to the total realized gain. The amount of gain that may be deferred is limited to the excess of the cost of the replacement property over the conversion proceeds received (i.e., the "boot" realized from not reinvesting all proceeds triggers gain recognition). Hedge the partial reinvestment computation to IRC 1033(a)(2)(A) and Treas. Reg. 1.1033(a)-2(c).

The character of the recognized portion (capital gain, ordinary income, or Section 1245/1250 recapture) is determined by the same rules that would have applied had the converted property been sold at arm's length. The "best" characterization for the taxpayer is generally to recognize recapture gain last, but the ordering rules follow the property's tax attributes, not taxpayer preference.

Basis of replacement property under IRC 1033(b)

Under IRC 1033(b), the basis of replacement property acquired in an IRC 1033 nonrecognition transaction is the cost of the replacement property MINUS the amount of gain that was NOT recognized (the deferred gain). This reduced basis ensures that the deferred gain is preserved for future recognition when the replacement property is eventually sold or otherwise disposed of.

Basis computation example

Taxpayer receives $500,000 in insurance proceeds for a warehouse destroyed by fire. Adjusted basis in the warehouse was $300,000, producing $200,000 of realized gain. The taxpayer elects IRC 1033 nonrecognition and purchases a replacement warehouse for $500,000 within the replacement period.

Cost of replacement property: $500,000
Less: deferred (unrecognized) gain: ($200,000)
Basis of replacement property under IRC 1033(b): $300,000

When the replacement warehouse is eventually sold, the full $200,000 deferred gain (plus any additional appreciation in the replacement property) will be recognized at that time.

Section 1245 recapture carryover

If the involuntarily converted property was Section 1245 property (depreciable personal property or certain other depreciable assets), the gain that was NOT recognized under IRC 1033 does not simply disappear. The unrecognized Section 1245 recapture potential carries forward into the replacement property, reflected in that property's lower basis under IRC 1033(b). When the replacement property is eventually disposed of, the full accumulated Section 1245 recapture amount (including recapture on both the original converted property and the replacement property) will be recognized as ordinary income at that time. IRC 1033 defers the recapture character, it does not convert it. Hedge the Section 1245 recapture carryover mechanics to IRC 1245(b)(4) and Treas. Reg. 1.1245-4(d).

For a comprehensive treatment of Section 1245 and Section 1250 recapture mechanics, including cost segregation and OBBBA bonus depreciation recapture planning, see our IRC 1245/1250 Depreciation Recapture, Cost Segregation, and OBBBA Bonus Practitioner Guide. For the Form 4797 reporting mechanics for depreciation recapture on property dispositions, see our IRC 1245/1250 Depreciation Recapture and Form 4797 Practitioner Guide.

OBBBA Bonus Depreciation and the IRC 1033 Planning Analysis

The One Big Beautiful Budget Act (OBBBA) restored 100% bonus depreciation for Qualified Production Property (QPP), defined generally as tangible depreciable personal property placed in service in the U.S. after January 20, 2025. When a taxpayer's IRC 1033 replacement property qualifies as QPP, the reduced basis rule under IRC 1033(b) creates a material planning tension that must be quantified before advising the client to elect nonrecognition.

Hedge required: The definition of Qualified Production Property, the scope of OBBBA's 100% bonus depreciation provision, and any applicable transition rules may be subject to final regulations not yet issued as of this guide's publication. Hedge all OBBBA QPP mechanics to the enacted OBBBA and current IRS.gov guidance. Do not advise a client on QPP eligibility without confirming current regulatory status.

The reduced basis trade-off

When the replacement property is QPP, the taxpayer gets 100% first-year bonus depreciation on the QPP's TAX BASIS, not on its cost. An IRC 1033 election reduces that basis by the deferred gain, which directly reduces the first-year bonus depreciation deduction. The IRC 1033 election is therefore not cost-free when the replacement is QPP: part of the tax benefit from deferring the gain is given back through lower depreciation deductions.

Trade-off illustration

Converted property: Section 1245 machinery (fully depreciated); insurance proceeds received: $500,000; realized gain: $500,000 (all Section 1245 recapture, ordinary income)
Replacement QPP cost: $500,000 (100% bonus depreciation eligible)
Path A (IRC 1033 election): Defer $500,000 gain; basis in QPP = $0 ($500,000 cost minus $500,000 deferred gain); bonus depreciation = $0 (no depreciable basis)
Path B (no election, recognize gain): Recognize $500,000 of ordinary income in year of conversion; basis in QPP = $500,000 (full cost); bonus depreciation = $500,000 in year of replacement; net taxable income effect in year of replacement = ($500,000)

In Path A, the gain is deferred but never gets a depreciation offset. In Path B, the gain and the depreciation offset occur in different years but may net to zero at the same marginal rate, with the only real difference being the time value of money and any rate change between the years. The better path depends on the taxpayer's specific facts.

When IRC 1033 still produces the better outcome

Multi-year replacement period with declining rate expectation: if the taxpayer's marginal rate is expected to decrease before the deferred gain is ultimately recognized (e.g., due to income reduction, rate legislation, or entity restructuring), the deferred gain may be taxed at a lower rate than the rate applicable in the year of conversion
Significant Section 1245 recapture on conversion: if the converted property's gain is primarily Section 1245 recapture (ordinary income rate, currently up to 37%), deferring that income through IRC 1033 election is almost always preferable; the taxpayer avoids a large ordinary income recognition in the conversion year and the replacement QPP basis, while reduced, may still generate meaningful depreciation over future years if not fully consumed by the deferred gain
State tax timing differences: in states that do not conform to OBBBA's 100% bonus depreciation, the depreciation reduction from a lower basis is less damaging on the state return, while the IRC 1033 gain deferral may still produce full state-level deferral benefit

When recognizing the gain may produce the better outcome

Large NOL or capital loss carryforwards: if the taxpayer has sufficient NOL carryforwards (or capital loss carryforwards for capital gain conversions) to offset the full conversion gain at minimal or zero additional tax cost, recognizing the gain now and taking full bonus depreciation on the entire replacement QPP cost may produce a substantially better net present value outcome
Current-year losses from other sources: if the taxpayer has large current-year losses from business operations, a real estate professional deduction, or other sources, recognizing the conversion gain in the same year may reduce or eliminate the net income impact while preserving the full QPP depreciable basis for first-year bonus depreciation
Marginal rate increase expected: if the taxpayer's marginal rate is expected to increase significantly in the year the deferred gain will ultimately be recognized (under a future sale of the replacement property), the current deferral locks in a higher eventual rate; recognition now at the lower current rate may be preferable

For context on how excess business loss limitations under the OBBBA interact with the deduction stacking that may result from both recognizing a conversion gain and claiming full bonus depreciation in the same year, see our IRC 461(l) Excess Business Loss Limitation and OBBBA Practitioner Guide.

QPP vs. real property: why the tension is less acute for condemnation replacements

The OBBBA bonus depreciation trade-off described in this section is most acute when the IRC 1033 replacement property is personal property QPP. For real property condemnation replacements qualifying under IRC 1033(g), the tension is considerably reduced: OBBBA's 100% first-year expensing does not apply to buildings (Section 1250 real property). Real property replaced under IRC 1033(g) is depreciable under the standard MACRS schedule (27.5 years for residential rental, 39 years for non-residential), so the basis reduction from the IRC 1033(b) deferred gain affects depreciation spread over many years rather than in a single first-year bonus deduction. The relative present-value impact of the basis reduction is therefore substantially smaller for real property condemnation replacements than for QPP replacements.

Modeling requirement: Before advising any client to make (or forgo) an IRC 1033 election when the replacement property is QPP, practitioners should build a complete net present value comparison of both paths at the client's actual marginal rates, using realistic discount rates and a realistic timeline for the eventual disposition of the replacement property. A qualitative "IRC 1033 defers the gain so it's better" analysis is insufficient when OBBBA's 100% first-year expensing is available on the full cost of the same replacement asset.

IRC 1033 Involuntary Conversion: Casualty, Condemnation, Replacement Period, and OBBBA Bonus Depreciation Interaction