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Section 1031 Like-Kind Exchange in 2026: Real Property Only, 45/180-Day Rules, Reverse Exchanges

By The Ledgerism Editorial Team · The Ledgerism Brief Editorial Team produces original, methodology-disclosed accounting and tax research—data trackers, databases, and reference guides built to be the most-cited source in the field. Every figure is verified against primary sources including FASB, the IRS, the PCAOB, NASBA, the AICPA, and state boards of accountancy.

A Section 1031 exchange lets a taxpayer defer federal capital gains tax on the sale of real property held for productive use in a trade or business or for investment, by reinvesting the proceeds into “like-kind” real property within strict deadlines. Since the Tax Cuts and Jobs Act of 2017 (Public Law 115-97, §13303), only real property qualifies; personal property exchanges were eliminated for transactions completed after December 31, 2017. The two hard deadlines, the 45-day identification window and the 180-day completion window of IRC §1031(a)(3), trip up more exchanges than any other technical requirement.

What is a Section 1031 exchange?

IRC §1031 permits a taxpayer to defer recognition of gain or loss on the exchange of real property held for productive use in a trade or business or for investment, if the property received is of “like kind” and is also held for productive use or investment. The TCJA of 2017 narrowed the statute to real property only, eliminating §1031 treatment for personal property such as art, equipment, livestock, and intangible assets. The deferral is not permanent; the taxpayer’s basis in the replacement property is carried over from the relinquished property under IRC §1031(d), with adjustments for boot received and additional cash invested. The gain is recognized when the replacement property is later sold without another §1031 exchange, or upon death (where IRC §1014 then steps up basis to fair market value).

Why Section 1031 matters

For real estate investors with appreciated property, Section 1031 deferral is the difference between paying 23.8% federal long-term capital gains plus state tax (combined often exceeding 35%) on accumulated appreciation and rolling that capital into a larger or differently-positioned asset. A taxpayer who acquired an apartment building in 2005 for $2 million and sells it in 2026 for $7 million faces $5 million of gain. Without §1031, the federal tax bill is approximately $1.19 million at the 23.8% combined long-term capital gains plus 3.8% NIIT rate. With a fully successful §1031 exchange, that $1.19 million stays invested in the next property. The economic compounding of multiple §1031 exchanges across a holding career is the foundation of much of the U.S. real estate investment thesis. The IRS estimates §1031 exchanges deferred roughly $7.85 billion in revenue in fiscal year 2024 (Joint Committee on Taxation, JCX-2-25).

Beyond the federal deferral, §1031 produces three secondary benefits that drive its use in private investment. First, the carryover basis under IRC §1031(d) means the depreciation schedule effectively resets only to the extent the replacement property’s basis exceeds the relinquished property’s adjusted basis (i.e., to the extent of new cash invested or new debt assumed). This often produces a “step-up plus step-down” effect where investors can layer in incremental depreciation while preserving the bulk of the deferred gain. Second, on the eventual death of the holder, IRC §1014 steps up the basis of inherited real property to fair market value, eliminating the deferred gain entirely. The combination of §1031 deferral during life and §1014 step-up at death is the foundation of multi-generational real estate planning. Third, qualified opportunity zone investments under IRC §1400Z-2 (modified by OBBBA §70403) sit alongside §1031 as a parallel deferral mechanism with a 10-year exclusion benefit, though the two cannot be stacked on the same gain dollar.

How Section 1031 works (mechanics)

A standard “forward” or “delayed” exchange runs through four phases. First, the exchanger sells the relinquished real property. The proceeds are wired directly to a qualified intermediary (QI) under a written exchange agreement that prevents the exchanger from having actual or constructive receipt of cash, satisfying Reg. §1.1031(k)-1(g)(4). Second, within 45 days of the sale closing date, the exchanger identifies replacement property in writing, signed and delivered to the QI or to the seller of the replacement property. The identification must follow one of three permitted rules under Reg. §1.1031(k)-1(c)(4): the three-property rule, the 200-percent rule, or the 95-percent rule. Third, the exchanger closes on the replacement property within 180 days of the original sale, or by the due date (including extensions) of the federal income tax return for the year of sale, whichever is earlier. Fourth, the QI directs the cash to the seller of the replacement property and the exchange completes. If the replacement property value or debt assumption is less than the relinquished property value, the difference becomes “boot” and is taxable to the extent of gain under IRC §1031(b).

Section 1031 timeline and identification rules

Worked example

Riverbend Holdings LLC, an Illinois limited liability company taxed as a partnership, owns an industrial warehouse in Joliet acquired in 2012 for $4,500,000 with $1,200,000 of accumulated depreciation by 2026. On March 1, 2026, Riverbend sells the warehouse for $9,500,000, with $1,800,000 of mortgage payoff. Adjusted basis is $3,300,000 ($4,500,000 cost minus $1,200,000 depreciation). Realized gain is $6,200,000 ($9,500,000 amount realized minus $3,300,000 adjusted basis). At combined 23.8% federal plus 4.95% Illinois (Illinois Income Tax Act §201), the tax bill on a fully taxable sale would be roughly $1,786,000. Riverbend instead executes a §1031 exchange. On March 1, 2026, $7,700,000 net proceeds (after mortgage payoff and closing costs) wire directly to QualifiedExchange Services LLC under a §1031 exchange agreement signed before closing. Within 45 days, by April 15, 2026, Riverbend delivers a written identification of three potential replacement properties under Reg. §1.1031(k)-1(c)(4)(i)(A). By August 28, 2026 (180 days from March 1), Riverbend closes on a $10,200,000 multi-tenant flex industrial property in Naperville, assuming $2,500,000 in new acquisition debt. Because Riverbend reinvested all $7,700,000 of equity and the replacement property exceeds the relinquished property in both value and debt, no boot is received. The full $6,200,000 of gain is deferred. New basis in the Naperville property is $4,000,000 ($3,300,000 carryover basis plus $700,000 of incremental cash invested), which becomes the depreciation base going forward. The deferred gain reduces the carryover basis and will be recognized only on a future taxable sale.

Recent changes (TCJA and 2026 status)

The TCJA of 2017 at §13303 limited §1031 to real property effective for exchanges completed after December 31, 2017. Personal property exchanges (equipment, vehicles, art, intangibles) lost §1031 treatment permanently. The OBBBA of 2025 (Public Law 119-21) did not modify §1031. Section 1031 remains a focus of recurring legislative proposals; the Treasury Green Book for fiscal year 2024 proposed capping §1031 deferrals at $500,000 per taxpayer per year ($1 million for joint filers), but the proposal was not enacted in either H.R. 7024 of 2024 or the OBBBA of 2025. The Trump administration’s fiscal year 2026 Green Book did not propose §1031 changes. The Joint Committee on Taxation (JCT) estimated §1031 deferrals at approximately $7.85 billion in fiscal year 2024 (JCX-2-25, Estimates of Federal Tax Expenditures). For practitioner purposes, the rule and the 45/180 deadlines have been stable since 2018.

Common pitfalls

• Constructive receipt of sale proceeds. Under Reg. §1.1031(k)-1(g)(4), the exchanger cannot have the right to receive, pledge, borrow, or otherwise benefit from the cash held by the QI before the exchange completes. Any breach (a wire to the taxpayer’s account, a personal use of escrow funds, a side letter allowing pledging) breaks the exchange and triggers full gain recognition.
• Missing the 45-day identification by even one day. The 45-day window under IRC §1031(a)(3)(A) does not extend for weekends, holidays, or natural disasters absent specific IRS disaster relief. The clock starts the day after the sale closes. Identification must be in writing, signed, and delivered to a person not disqualified under Reg. §1.1031(k)-1(k).
• Treating a tenancy-in-common (TIC) interest incorrectly. Rev. Proc. 2002-22 sets 15 conditions under which a TIC interest may qualify as real property eligible for §1031 treatment. A “TIC” that is in substance a partnership interest is ineligible under IRC §1031(a)(2)(D).
• Failing the like-kind test for foreign property. IRC §1031(h)(1) provides that U.S. real property and foreign real property are not like-kind to each other. An exchange of a Florida office building for a Costa Rica resort fails §1031.
• Receiving cash boot without recognizing it. Under IRC §1031(b), if the exchanger receives cash or relief from debt beyond what is reinvested, that amount is taxable up to the realized gain. A common pitfall: net debt boot occurs when the replacement property carries less mortgage than the relinquished property, even if all cash is reinvested.
• Using a disqualified person as QI. Reg. §1.1031(k)-1(k) disqualifies the exchanger’s attorney, accountant, real estate agent, or other agent who has acted as such within the prior two years. A QI must be an independent third party.
• Mishandling related-party exchanges. IRC §1031(f) requires a two-year holding period for property exchanged with a related party (as defined in §267(b) or §707(b)(1)). If either party disposes of the property within two years, gain is recognized retroactively.

Frequently asked questions

What qualifies as real property for Section 1031?

A. Under Reg. §1.1031(a)-3, real property includes land, buildings, permanent structures, and inherently permanent improvements. The 2020 final regulations (T.D. 9935) provide a state-law-driven definition. Like-kind treatment is broad within the real property category: raw land can be exchanged for an apartment building, a warehouse for a retail strip, agricultural land for an office building. The properties simply must both qualify as real property held for productive use or investment.

Can a primary residence be used in a Section 1031 exchange?

A. No. IRC §1031(a)(1) requires the property to be “held for productive use in a trade or business or for investment.” A personal residence does not qualify. The taxpayer’s primary residence is instead governed by IRC §121, which allows exclusion of up to $250,000 of gain ($500,000 joint) on sale of a principal residence held and used as such for two of the prior five years. A mixed-use property may apply §121 to the residential portion and §1031 to the investment portion under the Rev. Proc. 2005-14 split treatment.

What is a reverse 1031 exchange?

A. A reverse exchange occurs when the taxpayer acquires the replacement property before disposing of the relinquished property. Rev. Proc. 2000-37 establishes a safe harbor for reverse exchanges using an Exchange Accommodation Titleholder (EAT), an independent party who holds either the relinquished or replacement property for up to 180 days while the exchange is structured. The taxpayer cannot directly own both properties simultaneously and still claim §1031 treatment.

How long must the taxpayer hold the replacement property?

A. The IRC does not specify a minimum holding period. IRC §1031(a)(1) requires that the replacement property be “held for productive use in a trade or business or for investment.” The Service has historically scrutinized exchanges where the replacement property is sold or converted to personal use shortly after acquisition. Private letter rulings (PLR 8429039, PLR 200329021) suggest a holding period of at least one year, and frequently two years, demonstrates investment intent. There is no statutory bright-line.

Can I exchange one property for multiple replacement properties?

A. Yes. Reg. §1.1031(k)-1(c) and (e) permit one-to-many and many-to-one exchanges. The 45-day identification rules apply collectively. Under the three-property rule, up to three replacement properties may be identified regardless of total value. Under the 200% rule, any number of properties may be identified so long as aggregate FMV does not exceed 200% of relinquished property FMV. Under the 95% rule, if both prior rules are blown, the taxpayer must actually acquire 95% by value of all identified properties.

What happens if my exchange fails after the 45-day deadline?

A. If the 45-day identification window passes without proper written identification, or if the 180-day completion window expires without closing on identified property, the exchange fails. The full realized gain is recognized in the year of sale. The QI returns any remaining funds to the taxpayer; the receipt of returned funds is the trigger date for gain recognition. The taxpayer cannot retroactively cure a missed deadline. Some QIs offer “savings clauses” allowing the taxpayer to convert to a Delaware Statutory Trust (DST) interest at the eleventh hour to preserve §1031 treatment, but this requires actual acquisition within the 180-day window.

How does Section 1031 interact with depreciation recapture?

A. Real property depreciation recapture under IRC §1250 is deferred in a §1031 exchange to the extent the deferred gain exceeds prior depreciation. The recaptured depreciation rides forward into the replacement property’s basis. When the replacement property is ultimately sold outside §1031, both the deferred capital gain and the deferred §1250 recapture are recognized. Unrecaptured §1250 gain is taxed at a maximum 25% federal rate. For deeper context on the analytical treatment of carryover basis in due diligence work, see our Quality of Earnings report guide.

Can a Delaware Statutory Trust (DST) interest qualify for Section 1031?

A. Yes. Rev. Rul. 2004-86 confirmed that a beneficial interest in a properly structured Delaware Statutory Trust is treated as a direct interest in the underlying real property for federal tax purposes, qualifying as like-kind replacement property under §1031. The DST must satisfy the seven prohibitions of Rev. Rul. 2004-86, often called the “seven deadly sins,” including no new contributions of capital after closing, no renegotiation of debt, and no power to enter new leases after the initial offering closes.

Does Section 1031 apply at the state level?

A. State conformity varies. Most states with income tax conform to federal §1031 treatment, deferring state-level gain in parallel with the federal deferral. California has historically been an exception under former CA Rev. & Tax Code §18032, which required information reporting on out-of-state replacement property and a “claw-back” if the eventual sale was a taxable event without further §1031 treatment, even after the taxpayer moved out of California. Pennsylvania does not conform §1031 for personal income tax purposes (only for corporate net income tax), so individual taxpayers face Pennsylvania state tax even on a federally-deferred exchange. Practitioners should run state-by-state analysis whenever the relinquished property is in a different jurisdiction from the replacement property.

What is a build-to-suit or improvement exchange under Section 1031?

A. A build-to-suit (improvement) exchange allows the taxpayer to use exchange proceeds to construct improvements on the replacement property within the 180-day window. Rev. Proc. 2000-37 explicitly endorses parking of the replacement property with an Exchange Accommodation Titleholder (EAT) while improvements are constructed. The improvements must be completed and the property transferred to the exchanger within 180 days. This is one of the most common reverse exchange variations and is widely used by build-to-suit retail tenants and industrial developers.