1033 Election: Deferring Gain on Involuntary Conversions

A Section 1033 election lets you defer capital gains tax when your property is destroyed, stolen, seized, or condemned, provided you reinvest the proceeds in qualifying replacement property within the deadline set by the statute and report the election on your tax return. The deferral isn’t automatic when you receive cash: you have to claim it, buy the right kind of replacement, and meet the clock. Miss any of those, and the gain becomes taxable in the year you originally realized it, with interest running from that return’s original due date.

When the Election Is Available

Section 1033 covers four categories of involuntary loss: 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, no matter how much market pressure you felt.

Sales under threat of condemnation do qualify, but the threat has to be real and documented. Per IRS Publication 544, you need to learn from a news report or a government representative that your property will be acquired for public use, have that report confirmed by the relevant body, and have reasonable grounds to believe condemnation will follow if you don’t sell.² If all you have is an oral statement from an official, expect the IRS to ask for written confirmation.

The election only matters if there’s a gain. You have a gain 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 doesn’t apply.

One boundary worth naming: when a condemning authority hands you replacement property directly instead of paying cash, nonrecognition is mandatory and there’s nothing to elect. This is rare. Almost everyone reading this received money, and that’s the path where the election, deadlines, and reporting actually do work.

What Counts as Qualifying Replacement Property

You can’t spend the proceeds on anything you like. The replacement must be “similar or related in service or use” to what you lost. That standard is narrower than the “like-kind” test used for Section 1031 exchanges, and the IRS applies it differently depending on how you used the property.

If You Used the Property Yourself

Owner-users are held to a functional use test. 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 the actual end use and physical characteristics of both properties.

If You Held It as an Investment or Rental

Investors and landlords are held to a broader taxpayer use test. What matters is your relationship to the property: the management activity, the services you provided, and the type of investment risk you took. A condemned apartment building can be replaced with a commercial office building because your role as an investor collecting rents stays the same.

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 standard relaxes further to the “like-kind” test.³ Under this rule, a condemned rental complex could be replaced with undeveloped investment land. The relaxed standard applies only to condemnation, not casualty or theft.

Buying Stock in a Corporation That Owns Replacement Property

Instead of buying replacement property directly, you can buy stock in a corporation that owns qualifying property. To count, you have to acquire at least 80% of the total voting power and 80% of all other classes of stock.¹ A minority stake won’t work.

How Long You Have 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 date of the conversion.

For most involuntary conversions, the window is two years after the close of that first gain year.¹ If your business property is destroyed in July 2025 and the insurance payout creating the gain arrives in December 2025, your deadline is December 31, 2027.

Two extensions built into the statute:

Real property held for business or investment purposes that is condemned or sold under threat of condemnation gets three years.¹
A principal residence or its contents destroyed in a federally declared disaster gets four years.¹

If you still can’t get it done in time, you can request up to one additional year by showing reasonable cause. The IRS treats “new construction won’t be finished in time” as an acceptable reason. High market prices or a shortage of properties are specifically not valid grounds.⁴

Submit the request before the replacement period ends if you can. Address it to the SB/SE Field Examination Area Director for your state and include your name, taxpayer identification number, a legal description of the converted property, the date of conversion, adjusted basis, dates and amounts of payments received, the steps you’ve taken to find a replacement, and an explanation of why you need more time.⁴

How Much You Have to Reinvest

You defer gain only to the extent you reinvest. Specifically, you recognize gain only to the extent the total amount received exceeds what you spend on the replacement.¹ Spend at least as much as you received, and the entire gain is deferred.

Say your warehouse has an adjusted basis of $200,000. A fire destroys it, and you collect $500,000 in insurance proceeds. 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 in gain (the $500,000 received minus the $450,000 spent); the remaining $250,000 stays deferred.

The number to match or exceed is the amount received, not the gain. A common mistake is thinking you only need to reinvest the gain portion. Spending $300,000 to “cover” a $300,000 gain while pocketing the other $200,000 would actually trigger $200,000 in recognized gain.

Your Replacement Property’s Basis Drops by the Deferred Gain

Your replacement property’s basis must be reduced by the amount of deferred gain.¹ In the example above, deferring the full $300,000 leaves the new warehouse with a basis of $200,000 ($500,000 cost minus $300,000 deferred gain). That’s the same basis you had in the destroyed property. The deferred gain sits embedded in the replacement, waiting to be recognized when you eventually sell. The lower basis also reduces annual depreciation deductions in the meantime.

If you buy multiple replacements, the total basis reduction is allocated among them in proportion to their respective costs.

Watch for Mortgage Payoffs in Condemnation Awards

When a condemning authority pays off your mortgage directly as part of the award, that payment counts toward your “amount realized” even though the money never touches your account.⁵ Receive $60,000 in cash and have the government pay $50,000 directly to your lender, and your amount realized is $110,000. To defer everything, you need to spend at least $110,000 on the replacement. Focus only on the cash you actually received and you can accidentally trigger a taxable gain.

How to Report the Election

Making the election takes affirmative steps on your return. The IRS treats omitting the gain from gross income as an implicit election, but that’s a risky way to handle it because it doesn’t produce the paper trail the rules assume.

In the year you realize the gain, attach a statement to your return that includes the nature of the conversion, the date it occurred, the amount realized, your adjusted basis in the converted property, your computed gain, and your intention to replace the property within the statutory period. If you’ve already bought the replacement, include its description, cost, and the resulting basis calculation.

Business or investment property goes on Form 4797, Sales of Business Property.⁶ The attached statement supplements the form with the Section 1033 details.

If you haven’t acquired the replacement by the time you file the return for the gain year, you still make the election that year. The statement indicates that you intend to acquire qualifying replacement property within the statutory period. Once you close on the purchase, report the details on the return for the year of acquisition, including the final cost, the deferred gain calculation, and the adjusted basis of the replacement.

One rule catches partners and S corporation shareholders off guard. When entity property is involuntarily converted, the entity itself makes the election. Individual partners or shareholders cannot make the election independently for their share of the gain. Section 703(b) assigns most elections affecting partnership income to the partnership level, and the same principle governs S corporations.⁷

Related Party Restriction

You generally cannot defer gain by buying replacement property 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 tax year exceeds $100,000. For partnerships and S corporations, the $100,000 threshold is tested at both the entity and individual owner levels.¹

“Related person” tracks the relationships defined in Sections 267(b) and 707(b)(1): family members, controlled entities, certain trusts, and corporations or partnerships where you hold significant ownership. There is one carve-out: the restriction doesn’t apply if the related seller originally acquired the replacement property from an unrelated party during the applicable replacement period. The $100,000 threshold is a fixed statutory amount and is not adjusted for inflation.

Depreciation Recapture Doesn’t Disappear

Deferring gain under Section 1033 does not erase depreciation recapture on depreciable property. The rules interact, and the outcome depends on the property type and how much gain you recognize.

For depreciable personal property (equipment, machinery, vehicles), any gain you do recognize is treated as ordinary income to the extent of prior depreciation. Defer the entire gain and replace with more depreciable personal property, and the recapture is effectively deferred along with it.² Problems appear when you replace depreciable personal property with something that isn’t depreciable, or when you don’t reinvest enough to cover the full gain.

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

The IRS Can Come Back Years Later

Making a Section 1033 election extends the assessment period. The statute of limitations for assessing a deficiency attributable to the conversion gain doesn’t expire 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, acquire replacement property in 2027, and notify the IRS on your 2027 return, and the assessment period for 2025 stays open until at least 2030. Keep the underlying records for the full stretch.

If You Don’t Replace, or Don’t Spend Enough

If the replacement period expires and you haven’t bought qualifying property, or you spent less than you originally planned, the deferred gain becomes taxable. File an amended return (Form 1040-X for individuals) for the year you originally realized the gain, report the previously omitted gain, and expect interest running from that return’s original due date. The IRS does not waive the interest because the delay was outside your control.

The same applies when you fall short. Suppose you deferred $300,000 in gain expecting to spend $500,000 on the replacement, but ultimately spent only $400,000. The $100,000 shortfall is recognized gain, and you have to amend the original return to report it. Filing the amendment promptly limits how much interest piles up.

If the Converted Property Was Your Home

If your primary residence is involuntarily converted and you meet the Section 121 ownership and use requirements, you get a two-layer benefit. The IRS treats the involuntary conversion as a sale for Section 121 purposes, so you can exclude up to $250,000 of gain ($500,000 if married filing jointly) before Section 1033 comes into play.⁸

The order matters. Subtract the Section 121 exclusion from your insurance proceeds first. The reduced figure becomes your “amount realized” for Section 1033 purposes. Then subtract your adjusted basis to determine the gain eligible for deferral. Any remaining gain above the Section 121 exclusion can be deferred if you buy qualifying replacement property within the deadline.

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

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

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(g)-1 Condemnation of Real Property
4
Internal Revenue Service. Involuntary Conversion: Get More Time to Replace Property
5
eCFR. 26 CFR 1.1033(a)-2 Involuntary Conversion Into Similar Property, Into Money or Into Dissimilar 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