1033 Election: Deferring Gain on Involuntary Conversions

A Section 1033 election lets you defer the capital gain when your property is destroyed, stolen, seized, or condemned and you reinvest the proceeds into qualifying replacement property within the statutory deadline. You make the election on your tax return for the year the gain is realized, and the deferred gain rides along as a reduction to the basis of the new property, waiting to be recognized if and when you sell it. Miss the deadline, buy the wrong kind of replacement, or reinvest too little, and the gain becomes taxable, with interest running back to the original return’s due date.

When You Can Make the Election

Section 1033 applies only when the disposition is genuinely outside your control. The Internal Revenue Code recognizes four triggering events: destruction (fire, storm, flood, or similar casualty), theft, seizure, and condemnation or the threat of condemnation by a government body.¹ A voluntary sale doesn’t qualify, even if market pressure made it feel forced.

A sale under threat of condemnation does count, but you need more than a rumor. IRS Publication 544 says a threat exists when you learn from a news report or a government representative that your property will be acquired for public use, that report is confirmed by the relevant government body, and you have reasonable grounds to believe condemnation will follow if you don’t sell.² If you relied on an oral statement from an official, expect the IRS to ask for written confirmation.

You also need an actual gain. A gain exists when the insurance payout, condemnation award, or theft recovery exceeds your adjusted basis in the property. If you received less than your basis, you have a loss, and Section 1033 is beside the point.

One more boundary worth flagging. If the condemning authority gives you replacement property directly instead of cash, nonrecognition is automatic and there is nothing to elect. That situation is uncommon. The far more frequent path, and the one covered below, is receiving money and choosing to reinvest it.¹

How Much You Have to Reinvest

You defer gain only to the extent that your spending on replacement property matches or exceeds the amount you received. Spend the full proceeds, and the entire gain is deferred. Spend less, and the shortfall is taxable now.¹

Say your warehouse has an adjusted basis of $200,000, it burns down, and insurance pays $500,000. Your realized gain is $300,000. Buy a replacement warehouse for $500,000 or more, and the full $300,000 is deferred. Spend only $450,000, and you must recognize $50,000 of gain (the $500,000 received minus the $450,000 spent), with the remaining $250,000 deferred.

The common mistake is thinking you only need to reinvest the gain. You don’t. You need to match the amount received. Spending $300,000 to “cover” a $300,000 gain while pocketing the other $200,000 would trigger $200,000 of recognized gain.

Watch for Mortgage Payoffs in Condemnation Awards

When a condemning authority pays off your mortgage directly as part of the award, that payment is part of your amount realized even though the money never passes through your hands.³ If you receive $60,000 in cash and the government pays $50,000 to your lender, your amount realized is $110,000, and that’s the number you have to match. Taxpayers who look only at the check they personally received often trip here.

The Basis Reduction That Comes With the Deferral

Deferral is not forgiveness. The basis of your replacement property is reduced by the amount of deferred gain.¹ In the warehouse example, if you spend $500,000 and defer all $300,000, your new warehouse’s basis is $200,000 ($500,000 cost minus $300,000 deferred gain). That’s the same basis you had in the destroyed building, which is exactly the design: the deferred gain sits inside the replacement property until you sell. The lower basis also shrinks your annual depreciation deductions in the meantime.

If you buy more than one replacement property, the basis reduction is allocated among them in proportion to their respective costs.

What Counts as Qualifying Replacement Property

You can’t just spend the money on anything. The replacement must be “similar or related in service or use” to what you lost, a standard narrower than the “like-kind” test used for Section 1031 exchanges. The IRS applies the standard through two different lenses.

If You Used the Property Yourself

If you occupied or directly operated the property, the replacement has to serve a similar physical function. A destroyed manufacturing plant needs to be replaced with another manufacturing facility, not a retail store. The IRS looks at actual end use and physical characteristics.

If You Held It for Investment or Rental

If you held the property as an investment or rental, the IRS focuses on your relationship to the property rather than its physical features. What matters is the nature of your involvement: management activity, services provided, and the type of investment risk you assumed. A condemned apartment building can be replaced with a commercial office building under this test, because your role as an investor collecting rent stays the same.

A Broader Rule for Condemned Business or Investment Real Property

When real property held for business use or investment is taken by condemnation or sold under threat of condemnation, the replacement standard relaxes to the “like-kind” test.⁴ A condemned rental complex can be replaced with undeveloped investment land, or vice versa. This relaxed rule applies only to condemnations, not to casualty losses or theft.

Buying Corporate Stock Instead

You can satisfy the replacement requirement by buying stock in a corporation that owns qualifying replacement property, but you must acquire at least 80% of the total voting power and 80% of every other class of stock.¹ A minority stake in a company that happens to own similar property does not qualify.

Related-Party Purchases Are Restricted

You generally cannot defer gain by buying the replacement from a related person. The restriction applies to C corporations, partnerships where C corporations own more than 50% of the capital or profits interest, and any other taxpayer whose total realized gain from involuntary conversions during the year exceeds $100,000. For partnerships and S corporations, the $100,000 threshold is tested at both the entity and the owner level.¹ “Related person” picks up the relationships in Sections 267(b) and 707(b)(1): family members, controlled entities, certain trusts, and corporations or partnerships where you hold significant ownership. One exception: the restriction doesn’t apply if the related seller originally acquired the replacement property from an unrelated party during the replacement period. The $100,000 threshold is fixed and not adjusted for inflation.

Your Deadline to Replace

The replacement clock runs from the end of the tax year in which you first realize any part of the gain, not from the conversion itself.

The general rule is two years. For most involuntary conversions, you have two years after the close of the first tax year in which you realize gain.¹ If your business property is destroyed in July 2025 and the insurance payment arrives in December 2025, your deadline is December 31, 2027.

Three years applies when real property held for business or investment is taken by condemnation or sold under threat of condemnation.¹

Four years applies to principal residences (and their contents) destroyed in a federally declared disaster, and to certain weather-related sales of draft, breeding, or dairy livestock in federally designated areas; the Treasury can extend the livestock period further if the conditions persist.¹

If you can’t finish in time, you can request a one-year extension by showing reasonable cause, submitted to the SB/SE Field Examination Area Director for your state. The IRS points to unfinished new construction as an acceptable reason. High market prices and a shortage of available properties are specifically not valid grounds.⁵ File the request before the replacement period ends if you can.

How to Report the Election on Your Return

The IRS treats omitting the gain from gross income as an implicit election, but relying on that silence is risky. Make the election affirmatively in the year the gain is realized by attaching a statement to your return that includes:

The nature of the conversion and the date it occurred.
The amount realized.
Your adjusted basis in the converted property.
The computed gain.
Your intention to replace the property within the statutory period.
If you’ve already acquired the replacement, its description, cost, and the resulting basis calculation.

For business or investment property, report the conversion on Form 4797, Sales of Business Property; the attached statement supplements the form with the Section 1033 details.⁶

If you haven’t bought the replacement yet when you file, make the election anyway and state in the attached statement that you intend to acquire qualifying property within the period. Then, on the return for the year you complete the purchase, report the replacement details: final cost, the deferred gain calculation, and the adjusted basis of the new property.

Partnerships and S corporations elect at the entity level. Individual partners cannot make a separate Section 1033 election for their share of the gain; the election belongs to the partnership itself under Section 703(b).⁷ The same holds for S corporations.

Principal Residences: Section 121 Comes First

If the involuntarily converted property is your primary home and you meet the Section 121 ownership and use requirements, the IRS treats the conversion as a sale for Section 121 purposes. You can exclude up to $250,000 of gain, or $500,000 if married filing jointly, before Section 1033 enters the picture.⁸

The order matters. Subtract the Section 121 exclusion from your insurance proceeds first. The reduced number becomes your amount realized for Section 1033 purposes. Then subtract your basis to find the gain eligible for deferral. Any gain above the Section 121 exclusion can be deferred under Section 1033 if you buy qualifying replacement property on time.

Example: your home has a $95,000 basis, insurance pays $450,000, and you file single. Realized gain is $355,000. Section 121 removes $250,000, leaving an amount realized of $200,000 for Section 1033. Subtracting the $95,000 basis gives $105,000 in gain eligible for deferral. Spend at least $200,000 on a new home, and that $105,000 is deferred in full.

When the residence is in a federally declared disaster area, two additional rules apply. Insurance proceeds for unscheduled personal property (ordinary household contents not individually listed on the policy) generate no recognized gain at all. And all remaining insurance proceeds are treated as received for a single item of property, so any replacement similar to your residence or its contents qualifies.¹

Depreciation Recapture Doesn’t Go Away

Deferring gain under Section 1033 does not erase depreciation recapture; it moves it.

For depreciable personal property such as equipment, machinery, or vehicles, any gain you actually recognize is ordinary income to the extent of prior depreciation. If you defer the full gain and the replacement is also depreciable personal property, the recapture rides along with the deferred gain.² The problem arises when you replace depreciable personal property with something not depreciable, or when you reinvest too little.

For depreciable real property, the portion of gain attributable to excess depreciation carries over to the replacement property as “additional depreciation.” No ordinary income triggers at the time of conversion if you defer the full gain, but the recapture potential transfers and will be recaptured when you eventually sell the new property.²

The Statute of Limitations Stays Open Longer

Making a Section 1033 election keeps the IRS’s assessment window open past the usual three years. The statute for assessing a deficiency attributable to the conversion gain stays open until at least three years after you notify the IRS that you’ve replaced the property or that you’ve decided not to replace it.¹

Elect in 2025, replace in 2027, notify the IRS on the 2027 return, and the assessment period for 2025 stays open until at least 2030. Keep your records for the full stretch.

If You Don’t Replace, or Spend Too Little

If the replacement period expires without a qualifying purchase, or you spend less than you planned, the deferred gain becomes taxable in the year it was originally realized. File an amended return (Form 1040-X for individuals) for that year, report the gain, and expect interest to accrue from the original return’s due date. The IRS does not waive the interest even when the delay was beyond your control.

The same rule catches partial shortfalls. If you deferred $300,000 expecting to spend $500,000 but ultimately spent only $400,000, the $100,000 shortfall is recognized gain. Amend the original return to report it. Filing the amendment quickly limits how much interest piles up.

1
Office of the Law Revision Counsel. 26 USC 1033 Involuntary Conversions
2
Internal Revenue Service. Publication 544, Sales and Other Dispositions of Assets
3
eCFR. 26 CFR 1.1033(a)-2 Involuntary Conversion Into Similar Property, Into Money or Into Dissimilar Property
4
eCFR. 26 CFR 1.1033(g)-1 Condemnation of Real Property
5
Internal Revenue Service. Involuntary Conversion: Get More Time to Replace Property
6
Internal Revenue Service. 2025 Instructions for Form 4797
7
Internal Revenue Service. Technical Advice Memorandum TAM-103428-98
8
Office of the Law Revision Counsel. 26 US Code 121 – Exclusion of Gain From Sale of Principal Residence