Like-Kind Exchange (1031 Exchange): IRS Requirements

A like-kind exchange — commonly called a 1031 exchange after the governing Internal Revenue Code section — allows property owners to defer federal capital gains tax when exchanging one qualifying business or investment property for another of like kind. The deferral mechanism can preserve substantial capital that would otherwise be remitted to the IRS at the time of sale, making 1031 exchanges a significant planning tool in real estate and certain other asset classes. This page covers the statutory definition, the procedural mechanics, common property scenarios, and the boundary conditions that determine whether a transaction qualifies.

Definition and Scope

Under 26 U.S.C. § 1031, no gain or loss is recognized when property held for productive use in a trade or business, or for investment, is exchanged solely for property of like kind that will also be held for productive use or investment. The statute was significantly narrowed by the Tax Cuts and Jobs Act of 2017, which restricted 1031 treatment exclusively to real property; prior to that change, personal property — including equipment, aircraft, and intangible assets — could also qualify (IRS Publication 544).

"Like kind" under the IRS interpretation is broader than most property owners expect. The IRS confirms in Revenue Procedure 2008-16 and related guidance that virtually all U.S. real property held for investment or business use is considered like kind to other U.S. real property. An apartment building exchanges as like kind with raw land; a commercial warehouse exchanges as like kind with a strip mall. The classification does not require identical property types — only that both properties are real property held for qualifying purposes.

Crucially, the exchange must be for business or investment property on both sides of the transaction. A primary residence does not qualify under § 1031 (though it may receive separate treatment under 26 U.S.C. § 121). For context on how capital gains interact with real estate dispositions generally, see Capital Gains Tax Rules and Real Estate Tax Rules.

How It Works

A 1031 exchange is not a simultaneous property swap. The IRS allows a deferred (or "Starker") exchange structure in which the taxpayer sells the relinquished property and then identifies and acquires replacement property within strict statutory windows.

The procedural sequence under Treasury Regulation § 1.1031:

1. Sale of the relinquished property. The taxpayer sells the property being given up. Proceeds must be held by a qualified intermediary (QI) — a third party who holds the exchange funds and is structurally prohibited from being the taxpayer's agent, attorney, or accountant.
2. 45-day identification window. Within 45 calendar days of closing on the relinquished property, the taxpayer must identify replacement property in writing. The IRS permits identification under one of three rules:
3. 3-Property Rule: Up to 3 properties of any value.
4. 200% Rule: Any number of properties whose combined fair market value does not exceed 200% of the relinquished property's value.
5. 95% Rule: Any number of properties, provided the taxpayer actually acquires at least 95% of the total identified value.
6. 180-day exchange period. The taxpayer must close on the replacement property within 180 calendar days of the relinquished property's closing (or by the tax return due date for that year, including extensions — whichever is earlier).
7. Boot recognition. Any cash or non-like-kind property received — collectively called "boot" — is taxable in the year of the exchange. Mortgage relief on the relinquished property that exceeds mortgage assumed on the replacement also constitutes boot (IRS Publication 544, Chapter 1).
8. Basis carryover. The taxpayer's adjusted basis in the relinquished property carries over to the replacement property, reduced by deferred gain. This affects future Depreciation and Amortization Rules on the replacement asset.

The gain deferred is not eliminated — it is rolled into the basis of the replacement property and becomes taxable upon an eventual taxable sale, or upon death (where a stepped-up basis may eliminate it under current estate rules).

Common Scenarios

Scenario 1 — Standard Real Estate Reinvestment. A taxpayer sells a rental apartment building with a realized gain of $400,000 and acquires a commercial office building of equal or greater value using a QI. If all identification and timing rules are met and no boot is received, the entire $400,000 gain is deferred. The Net Investment Income Tax otherwise applicable at 3.8% on passive investment gains is similarly deferred.

Scenario 2 — Partial Exchange (Boot Received). A taxpayer exchanges a warehouse worth $1,000,000 but acquires replacement property worth only $850,000. The $150,000 difference is boot — taxable as capital gain in the exchange year, even though the remaining gain rolls over.

Scenario 3 — Reverse Exchange. The taxpayer acquires the replacement property before selling the relinquished property. IRS Revenue Procedure 2000-37 provides a safe harbor for reverse exchanges, capping the parking arrangement at 180 days. This structure is more complex and requires an exchange accommodation titleholder (EAT) to hold title.

Scenario 4 — Improvement (Build-to-Suit) Exchange. Also called a construction exchange, this allows proceeds to fund improvements on the replacement property before title transfers to the taxpayer, within the 180-day window, per the safe harbor in Revenue Procedure 2000-37.

Decision Boundaries

Not every real property transaction qualifies, and several boundary conditions determine whether § 1031 deferral applies or fails.

Qualifying vs. Non-Qualifying Property

Timing Failures. Missing either the 45-day identification deadline or the 180-day closing deadline disqualifies the entire exchange — there are no statutory extensions except for presidentially declared disasters (IRS Notice 2020-23 extended deadlines for COVID-19-affected transactions expiring between April 1 and July 15, 2020).

Qualified Intermediary Disqualification. If the taxpayer has actual or constructive receipt of exchange funds — for example, because the QI is a disqualified person under Treasury Regulation § 1.1031(k)-1(k) — the exchange fails and the full gain is recognized.

Related-Party Exchanges. Exchanges between related parties (as defined under 26 U.S.C. § 267 and § 707(b)) are permitted but carry a two-year holding requirement. If either party disposes of the exchanged property within two years, the deferred gain becomes taxable (§ 1031(f)).

State Tax Conformity. Federal deferral does not automatically produce state-level deferral. Taxpayers selling property in a state that does not conform to § 1031 may owe state capital gains tax in the year of exchange even while deferring federal tax. For the broader state and local tax overlay, see State and Local Tax Deduction (SALT).

The distinction between a qualifying exchange and a taxable sale frequently turns on procedural compliance rather than economic substance. The IRS scrutinizes whether the qualified intermediary was properly structured, whether identification was timely and sufficiently specific, and whether the taxpayer had constructive receipt of proceeds. For the broader framework governing how real property gains interact with passive activity and depreciation recapture, Real Estate Tax Rules provides additional context.

References

• 26 U.S.C. § 1031 — Internal Revenue Code (Cornell LII)
• Treasury Regulation § 1.1031 — 26 CFR (eCFR)
• [IRS Publication 544: Sales and Other Dispositions of Assets](https://www.