If the relinquished property is destroyed before closing
If your relinquished property burns down or is destroyed by a natural disaster before you complete the 1031 exchange, the transaction changes fundamentally. You have not sold real property — you have suffered an involuntary conversion under Section 1033. The insurance proceeds you receive are the amount realized.
Under Section 1033, you can defer the gain from an involuntary conversion by reinvesting the insurance proceeds in similar or related property within two years (three years for real property taken by condemnation). You do not need a qualified intermediary and there is no 45-day identification rule. If you already had a 1031 exchange set up with a QI and the property is destroyed, work with your attorney and QI immediately — the characterization of the transaction may shift from a 1031 to a 1033 exchange.
If the replacement property is destroyed after closing
If you complete your 1031 exchange and acquire a replacement property, then that replacement property burns down, the 1033 exchange rules now apply to the replacement property as a separate event. Your 1031 exchange is already complete — you successfully deferred your original gain. The casualty on the replacement property starts a new Section 1033 clock.
You recognize gain on the casualty to the extent insurance proceeds exceed your adjusted basis in the replacement property (which includes the carryover basis from the exchange). That gain can be deferred under Section 1033 by reinvesting the proceeds in similar property within two years.
What about the 180-day 1031 exchange deadline?
If a casualty occurs to the replacement property you have already identified but not yet closed on, and you cannot close within the 180-day window, the exchange may fail for that property — triggering gain recognition. The IRS has in some cases granted extensions to 1031 exchange deadlines for federally declared disasters (through Revenue Procedures or IRS notices), so check for any relevant extensions if a natural disaster affects your exchange area.
The practical lesson: always identify more than one replacement property under the 3-property rule. If your first choice is destroyed, you have identified alternatives to fall back on. Maintain contact with your QI on any casualty event during the exchange period.
Section 1033 replacement periods and the reinvestment test
Section 1033 gives you a longer clock than a 1031 exchange. The replacement period generally runs to the end of the second tax year after the year in which you first realize gain from the conversion (the year insurance or condemnation proceeds exceed your basis). For real property held for productive use in a trade or business or for investment that is condemned, the period is three years. There is no 45-day identification requirement and no qualified intermediary.
The reinvestment standard differs by type of event. A casualty (fire, storm, flood) uses the narrower similar or related in service or use test — the replacement must be functionally similar to what was lost. A condemnation of business or investment real property uses the broader like-kind standard, closer to 1031. Match your replacement property to the correct test.
How much gain is deferred, and how basis carries over
Section 1033 defers gain only to the extent you reinvest all the proceeds. If your insurance award exceeds your adjusted basis, you have a realized gain; you defer it only up to the amount you spend on qualifying replacement property. Any proceeds you keep are taxable gain, much like boot in a 1031.
Example: a rental with a $200,000 adjusted basis burns and you collect $350,000 of insurance, a $150,000 realized gain. If you spend $350,000 or more on a replacement rental, the entire gain defers. If you spend only $300,000 and pocket $50,000, you recognize $50,000 of gain and defer $100,000. Your basis in the replacement property is its cost minus the deferred gain — so the deferred gain, including deferred depreciation recapture, is preserved and taxed on the eventual sale.
Depreciation recapture still rides along
A casualty or condemnation is treated like a sale for character purposes, so depreciation recapture is baked into the gain. Deferring under Section 1033 defers the recapture too — but only if you fully reinvest. If you recognize any gain because you kept some proceeds, recapture is generally recognized first (ordinary income under Section 1245, or unrecaptured Section 1250 gain up to 25%). This mirrors the 1031 rule that boot is taxed before capital gain.
Disaster relief: postponed deadlines under Section 7508A
When the President declares a federal disaster, the IRS routinely issues notices postponing tax deadlines for affected taxpayers under Section 7508A — and these often extend the 45-day and 180-day 1031 deadlines and Section 1033 replacement periods. Relief is typically available if the relinquished property sold on or before the disaster date and a deadline falls within the postponement window, or if the taxpayer or key exchange parties are located in the disaster area. Check the specific IRS disaster notice for your area — the extensions are date- and county-specific and are not automatic beyond what the notice grants.
Reporting a casualty or condemnation and electing deferral
Report a casualty or theft gain or loss on Form 4684; gains and losses on business or investment property then flow to Form 4797. You elect Section 1033 deferral by simply not reporting the gain on the return for the year you realize it and attaching a statement with the details of the conversion, the proceeds, and your reinvestment plan. If you have not yet replaced the property by the filing date, you still make the election and then report the replacement — or the recognized gain via amended return — once the replacement period closes.
Because casualty timing is unpredictable, keep meticulous records: insurance or condemnation documents, adjusted-basis schedules, and receipts for replacement property. If a casualty strikes mid-1031, contact your qualified intermediary and tax advisor immediately — the correct path may be to convert the transaction to a 1033 or to fall back on an alternate identified property.
Casualty loss deduction versus casualty gain
A casualty does not always produce a gain. If your insurance recovery is less than your adjusted basis, you have a casualty loss on business or investment property, deductible on Form 4684 and flowing to Form 4797 (business and investment casualty losses are not subject to the personal-casualty limitations that restrict losses on a personal residence). If the recovery exceeds basis, you have a casualty gain that Section 1033 can defer. Determine which side of your basis the proceeds land on before deciding whether deferral is even relevant.
Insurance proceeds allocated to lost rental income (business interruption) are ordinary income, not part of the property conversion, and cannot be deferred under Section 1033 — separate the components of your award.
Choosing between a 1031 and a 1033 path
When a casualty interrupts a planned 1031, you may have a choice. Section 1033 offers a longer replacement window (two or three years) and no QI requirement, but the casualty version uses the narrower similar or related in service or use test. Section 1031 offers the broader like-kind standard but tighter 45/180-day deadlines and requires a QI. If your relinquished property was destroyed before any sale, you generally must use 1033. If it was condemned, you may be able to use either, and 1033's three-year window for condemned real property is usually more forgiving.
Work the decision with your advisor promptly — the characterization affects your deadlines, your reinvestment options, and your paperwork.
Keep the exchange proceeds properly held
If a 1031 was underway when the casualty struck, the sale proceeds may still be sitting with your qualified intermediary. Do not take receipt of insurance or exchange funds while sorting out the path forward — constructive receipt can trigger the very gain you are trying to defer. Coordinate the QI, your insurer, and your tax advisor together so the funds move correctly into whichever structure you ultimately use.
Frequently asked questions
How long do I have to replace property under Section 1033?
Generally to the end of the second tax year after the year you first realize gain from the conversion — extended to three years for real property held for business or investment that is condemned. Federal disaster notices can extend these periods further.
Is depreciation recapture deferred in a Section 1033 conversion?
Yes, if you fully reinvest the proceeds in qualifying replacement property. If you keep some proceeds and recognize gain, recapture is generally recognized first, as ordinary income (1245) or unrecaptured 1250 gain.
How do I elect Section 1033 deferral?
You elect by not reporting the realized gain on your return for the year of the conversion and attaching a statement describing the event, the proceeds, and your replacement plan. Report the details on Form 4684 and, for business or investment property, Form 4797.
Is a casualty loss on a rental deductible?
Yes. If your insurance recovery is less than your adjusted basis, the casualty loss on business or investment property is deductible on Form 4684 and flows to Form 4797. It is not subject to the personal-casualty loss limitations that apply to a primary residence.
Can I use Section 1033 instead of Section 1031?
They are separate provisions, but both can defer gain from a real property disposition. Section 1033 applies to involuntary conversions (casualty, condemnation); Section 1031 applies to voluntary like-kind exchanges.
Does a disaster extension apply to 1031 exchange deadlines?
Sometimes. The IRS has issued Revenue Procedures and notices extending 1031 deadlines in certain federally declared disaster areas. Check IRS.gov for current guidance if a disaster affects your exchange.
If my relinquished property burns down, can I still do a 1031?
Generally no — there is no voluntary sale to exchange. The transaction becomes a Section 1033 involuntary conversion. Consult a qualified intermediary and tax attorney immediately.
Sources
Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.