1031 Exchange Rules: The 7 Requirements You Must Follow
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Key Takeaways
Seven specific IRS rules govern every 1031 exchange. Miss any one of them — even by a day or a technicality — and the exchange fails. Understanding all seven is the foundation of a successful exchange.
- Rule 1: Property must be held for business or investment
- Rule 2: Like-kind means real property for real property
- Rule 3: A qualified intermediary must hold the funds
- Rule 4: Identify replacement property within 45 calendar days
- Rule 5: Close on replacement property within 180 calendar days
- Rule 6: Reinvest all equity and replace all debt for full deferral
- Rule 7: Same taxpayer on both sides
- When an exchange fails
- Reporting requirement: Form 8824
Every 1031 exchange must satisfy seven requirements. Violate any one and the exchange fails, the proceeds are released, and the full capital gains tax comes due. There are no do-overs, so understanding each rule precisely is the best protection.
Rule 1: Property must be held for business or investment
What it requires. Section 1031 applies only to real property held for productive use in a trade or business or for investment. The IRS evaluates how you actually held and used the property, not just what you intended.
What qualifies. Rental properties (single-family through commercial), farmland, raw land held for appreciation, industrial properties, and commercial buildings used in your business.
What does not qualify. Your primary residence. Property bought and sold as inventory, including fix-and-flip projects and development lots held for resale. These are dealer properties, and Section 1031 does not apply.
How people get this wrong. Buying a property, renovating it, and selling it six months later without documented rental activity. The IRS views that pattern as dealing, not investment.
Practical fix. Hold for at least 12 months with documented rental income reported on Schedule E. Two full tax years is more conservative and stronger in an audit. If you have mixed use (part personal, part rental), consult a tax advisor before selling.
Rule 2: Like-kind means real property for real property
What it requires. Any U.S. real property held for business or investment is like-kind to any other U.S. real property held for business or investment. The IRS cares about the nature of the asset (real property), not its type, grade, or quality.
What qualifies. A single-family rental exchanged for a 50-unit apartment building. A strip mall exchanged for farmland. A warehouse exchanged for an office building. All qualify.
What does not qualify. U.S. real property exchanged for foreign real property. Personal property of any kind (post-2017 TCJA, only real property qualifies). A rental property exchanged for a partnership interest, though interests in certain real-property-holding entities may work with careful structuring.
How people get this wrong. Assuming that "like-kind" means the same property type, or attempting cross-border exchanges.
Practical fix. Confirm both properties are U.S. real property held for investment or business. Beyond that, the like-kind requirement is broadly satisfied.
Rule 3: A qualified intermediary must hold the funds
What it requires. In a deferred exchange, a qualified intermediary (QI) must hold the sale proceeds between your sale and purchase. This prevents constructive receipt, which would kill the exchange instantly.
Who can serve as QI. A professional exchange accommodation company that has had no prior agency relationship with you.
Who cannot serve as QI. Anyone who has acted as your agent, employee, attorney, accountant, broker, or similar within the two years before the exchange. These are "disqualified persons" under the regulations. (Routine legal services unrelated to the exchange are an exception, but using an independent QI firm is the safest approach.)
How people get this wrong. Closing the sale before the QI agreement is signed. If the sale closes first, constructive receipt has occurred and the exchange fails.
Practical fix. Engage your QI and sign the exchange agreement before the sale closes. Confirm the QI's wire instructions with the title company so proceeds go directly to the QI.
Rule 4: Identify replacement property within 45 calendar days
What it requires. A written document, signed by you, delivered to your QI before midnight on Day 45, describing each potential replacement property with enough specificity to be unambiguous. A street address or legal description works.
The three identification sub-rules:
| Rule | What you can identify | Constraint |
|---|---|---|
| 3-Property Rule | Up to 3 properties | No value limit |
| 200% Rule | Any number of properties | Combined FMV cannot exceed 200% of sale price |
| 95% Rule | Any number at any value | Must acquire at least 95% of total identified value |
Most exchangers use the 3-Property Rule. The 95% Rule is almost never practical.
How people get this wrong. Treating the 45 days as discovery time instead of confirmation time. Waiting until Day 44 and then facing delivery problems (bounced email, fax failure, courier delay).
Practical fix. Start identifying properties before you sell. Have 2-3 strong candidates ready by closing day. Submit your identification by Day 40 at the latest.
Rule 5: Close on replacement property within 180 calendar days
What it requires. The replacement property must be closed and recorded by Day 180 or by the due date of your tax return (including extensions), whichever comes first.
The tax-return trap. If you sell in late October, November, or December and your return is due April 15, that deadline arrives before Day 180 — cutting your window short unless you file an extension. File Form 4868 to secure the full window. There is no cost to filing an extension.
How people get this wrong. Being under contract or in escrow on Day 180 but not yet closed. "Under contract" is not sufficient. The deed must be recorded.
Practical fix. Plan to close by Day 160 to leave a buffer. File Form 4868 automatically in any exchange year.
Rule 6: Reinvest all equity and replace all debt for full deferral
What it requires. To defer 100% of your gain, the replacement property's total acquisition cost must equal or exceed the net sale price of the relinquished property, and the new debt must equal or exceed the old debt.
| Shortfall type | What triggers it | Tax consequence |
|---|---|---|
| Cash boot | Buying a cheaper replacement property | Difference is taxable (up to your realized gain) |
| Mortgage boot | Taking on less debt than you retired | Difference is taxable unless offset by additional cash |
Tax composition when boot is taxed. Recognized gain is not taxed uniformly at capital gains rates. Depreciation recapture (Section 1250 unrecaptured gain) is taxed first at a maximum rate of 25%. Any remaining gain above the recaptured amount is taxed at federal long-term capital gains rates. High-income taxpayers may also owe the 3.8% Net Investment Income Tax on investment income above certain thresholds ($200K single / $250K married AGI).
How people get this wrong. Paying off a $300,000 mortgage on the old property but only taking a $200,000 mortgage on the new one, without adding $100,000 of personal cash.
Practical fix. Work with your QI and CPA to model the equity and debt numbers before you make offers. Partial exchanges (deliberately taking some boot) are allowed and sometimes strategic, but they should be intentional.
Rule 7: Same taxpayer on both sides
What it requires. The entity or individual that sells the relinquished property must be the exact same entity or individual that buys the replacement property.
How people get this wrong. Selling from one LLC and buying through a different LLC, even though the same person controls both. Married couples selling jointly but taking replacement title individually. Partners in a partnership trying to buy replacement property individually.
Practical fix. Plan entity structure before the exchange. If you need to change entities, consult a tax attorney about restructuring before or after the exchange, not during it.
When an exchange fails
If any rule is broken, the exchange fails. Your QI releases the held proceeds to you, and you owe capital gains tax on the full realized gain as if the exchange never happened. There is no mechanism to correct a failed exchange after the fact. The only protection is getting the rules right from the start.
Reporting requirement: Form 8824
Every completed 1031 exchange must be reported to the IRS on Form 8824, filed with your tax return for the year the exchange was initiated. If the exchange straddles two calendar years — you sell in December and close the replacement in February — you still report it on the year-of-sale return. Form 8824 calculates the deferred gain and the adjusted basis carried into the replacement property. Your CPA uses it to establish the new property's basis, which determines future depreciation and the gain recognized when you eventually sell.
The Bottom Line
The 1031 exchange rules are precise but not complicated. Property use, like-kind matching, QI requirement, 45-day identification, 180-day closing, full reinvestment, and same-taxpayer consistency — master these seven and you're positioned for a successful exchange.
Frequently Asked Questions
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