What a 1031 Exchange Is (and What It Is Not)

IRC § 1031 permits deferral of capital gains tax on the disposition of real property held for productive use in a trade or business or for investment, provided the taxpayer receives “like-kind” replacement property of equal or greater value. The statute has been around since 1921. The current form reflects the Tax Cuts and Jobs Act of 2017, which limited § 1031 to real property only and eliminated like-kind treatment for personal property, vehicles, machinery, and collectibles.

“Like-kind” is broadly defined for real property. Any U.S. real estate held for investment or productive business use qualifies — regardless of type, grade, or location. A California residential rental can be exchanged for a Texas office building. Raw land in Colorado can be exchanged for an apartment building in Florida. The nature and grade of the properties do not need to match. The key requirement is that both properties are U.S. real property held for investment or business use, not for personal use or resale.

What does not qualify, under current law:

• Primary residence. Your home is not investment property. A vacation home may qualify if it satisfies the use requirements of Rev. Proc. 2008-16 (rented at fair market value for at least 14 days per year and personal use does not exceed the greater of 14 days or 10% of rental days in each of the two years before and after the exchange).
• Property held for sale (inventory). A developer who buys and flips properties holds them as inventory, not for investment. § 1031 does not apply.
• Stock, partnership interests, and securities. These were never like-kind eligible for real property, and the TCJA made the distinction permanent.
• Foreign real property exchanged for U.S. real property. Foreign property is not like-kind to U.S. property under § 1031(h).

The gain is deferred, not forgiven. The deferred gain carries over as a reduction in the basis of the replacement property. If you sell the replacement property in a taxable transaction, the deferred gain — plus any additional appreciation on the replacement property — is recognized at that time. The exchange buys time and preserves capital for reinvestment. It does not eliminate the tax liability permanently (with one important exception, discussed in the estate planning section).

The Rules That Must Be Followed Exactly

A 1031 exchange lives or dies on two deadlines and one prohibition. The deadlines are absolute. The prohibition has no exceptions.

The 45-Day Identification Period

From the date you close on the relinquished property, you have exactly 45 calendar days to identify the replacement property in writing to your Qualified Intermediary (QI). The identification must be signed and delivered before midnight on day 45. There is no extension for weekends, holidays, or circumstances outside your control — including natural disasters, unless a presidentially-declared disaster provides a specific § 7508A extension. If day 45 passes without a proper written identification, the exchange fails and the gain is recognized.

The identification rules under Treas. Reg. § 1.1031(k)-1(c) permit three identification alternatives:

• Three-property rule: Identify up to three properties regardless of value.
• 200% rule: Identify any number of properties, provided their aggregate fair market value does not exceed 200% of the relinquished property’s fair market value.
• 95% rule: Identify any number of properties of any aggregate value, but you must close on at least 95% of the total identified value.

Most investors use the three-property rule. Identifying more creates compliance risk if the additional properties are not acquired.

The 180-Day Exchange Period

You have 180 calendar days from the close of the relinquished property — or, if earlier, the due date (including extensions) of your federal tax return for the year of the transfer — to close on the replacement property. The 180-day period runs concurrently with the 45-day identification period. If you close on the relinquished property in November and your tax return is due April 15 without an extension, the exchange period may end before day 180. Filing an extension to October 15 preserves the full 180 days for November closings. Failing to account for this is a common and costly mistake.

The Boot Problem

Any non-like-kind property received in the exchange is taxable “boot.” This includes cash, net debt relief, and property that is not real estate. To defer the entire gain, the replacement property must satisfy two requirements simultaneously:

• Value rule: The replacement property must be equal to or greater in value than the relinquished property’s sale price.
• Equity rule: The equity in the replacement property (value minus mortgage assumed) must equal or exceed the equity in the relinquished property (net sale price after mortgage payoff).

If you trade down in value or pull cash out, the difference is boot and is taxed. Debt relief — where the new mortgage is smaller than the old one — is also boot unless offset by additional cash into the exchange.

The Prohibition on Touching the Proceeds

You cannot receive the sale proceeds, even temporarily. Once the relinquished property closes, the proceeds must go directly to the QI and stay there until applied to the replacement property purchase. Any actual or constructive receipt of the funds by the exchanger destroys the exchange. “Constructive receipt” under Treas. Reg. § 1.1031(k)-1(f) includes situations where the proceeds are set aside for your benefit, are subject to your unilateral withdrawal, or are otherwise available to you — even if you never actually take the money.

Qualified Intermediary: Why This Choice Matters

A Qualified Intermediary is not optional — it is the structural requirement that makes a deferred exchange possible. The QI holds the sale proceeds, enters into an exchange agreement with the taxpayer, and facilitates the transfer to the replacement property. Without a QI, there is no valid deferred exchange under Treas. Reg. § 1.1031(k)-1(g)(4).

The disqualified person rules matter. Under Treas. Reg. § 1.1031(k)-1(k), the following cannot serve as your QI:

• Your attorney, if that attorney has performed legal services for you within the prior two years (other than exchange-related services).
• Your CPA or accountant.
• Your real estate agent or broker for the transaction.
• Any employee, related party, or person who has a business relationship with you outside of the exchange.

The QI must be a genuinely independent third party. Most QIs are title companies, exchange companies, or dedicated intermediary firms. They are unregulated at the federal level — no licensing requirement, no bonding requirement, no mandatory segregation of exchange funds from operating capital. This is a real risk. Several prominent QIs have become insolvent or committed outright theft of exchange funds over the past two decades. Investors who chose a QI based on price alone and did not vet the company’s financial health and escrow practices have lost their exchange proceeds — and still owed the tax.

When we handle a 1031 exchange, QI selection and vetting is part of the engagement. We review the QI’s exchange agreement for compliance with Treas. Reg. § 1.1031(k)-1, confirm that exchange funds are held in segregated, insured accounts, and ensure the assignment of the sale contract to the QI is properly structured. A QI exchange agreement that is deficient on its face — wrong notice provisions, improper receipt language, missing assignment mechanics — can fail the exchange even when the deadlines are met.

Exchange Agreement and Contract Assignment

The QI structure requires that your sale contract be assigned to the QI, or that the QI be substituted as the seller in the exchange documents, before the closing. The buyer must receive notice of the assignment. An exchange agreement entered into after the relinquished-property closing is too late. The exchange agreement and QI engagement must be in place before the deed transfers. This is a sequencing requirement, not a formality — and it is the reason we prefer to be brought in before the sale contract is signed, not after.

Reverse and Improvement Exchanges

A standard deferred exchange requires that you sell first and buy second. When you need to acquire the replacement property before the relinquished property closes, or when you want to use exchange proceeds to improve the replacement property before taking title, the structure is significantly more complex — and significantly more attorney-dependent.

Reverse Exchanges

A reverse exchange allows you to acquire the replacement property first and sell the relinquished property afterward. The IRS provided a safe harbor for reverse exchanges in Rev. Proc. 2000-37, later clarified by Rev. Proc. 2004-51. The safe harbor requires that an Exchange Accommodation Titleholder (EAT) — a separate LLC or entity that is not the taxpayer — take title to either the replacement property (parked with the EAT while you sell the relinquished property) or the relinquished property (parked with the EAT after acquisition of the replacement property). The exchange must be completed within 180 days of the EAT taking title.

Reverse exchanges are more expensive to structure, require additional legal work to establish and operate the EAT, and carry more financing complexity because most lenders will not lend directly to an EAT. The added cost is frequently justified when: (1) the replacement property is available now at an attractive price and you cannot close on the relinquished property in time; or (2) the real estate market conditions in your target market make it impossible to reliably acquire replacement property within 45 days of a relinquished property closing.

Build-to-Suit (Improvement) Exchanges

An improvement exchange — sometimes called a build-to-suit exchange or construction exchange — allows exchange proceeds to be used to improve the replacement property before the exchanger takes title. The authority is Treas. Reg. § 1.1031(k)-1(e). Like a reverse exchange, this structure requires an EAT to hold title during the improvement period, and the improvements must be substantially completed within the 180-day exchange period. Any exchange proceeds not applied to improvements before the period ends are treated as boot.

The practical constraint: the 180-day period runs from the relinquished property closing. Construction projects that overrun the deadline expose the unspent proceeds to tax. We build a contingency schedule into improvement exchange engagements and monitor the timeline actively.

Delaware Statutory Trust (DST) Interests

A Delaware Statutory Trust (DST) allows investors to hold a fractional beneficial interest in a real estate trust that qualifies as replacement property for § 1031 purposes under Rev. Rul. 2004-86. DSTs are commonly used by investors who want to exit active property management, diversify across multiple properties, or complete an exchange when they cannot identify suitable direct replacement property within 45 days.

DST interests are securities — they must be offered by registered broker-dealers under a Private Placement Memorandum. From a § 1031 perspective, they are treated as direct ownership of real property for exchange purposes. The investor’s QI transfers exchange proceeds directly to the DST at closing.

DSTs have structural limitations: no refinancing, no capital calls, and no modification of the lease terms during the trust period. They are passive investments. For investors primarily motivated by deferral rather than active management, they are often the cleanest exit available.

Tenancy-in-Common (TIC) Interests

Tenancy-in-common interests in real property also qualify as like-kind replacement property. Under Rev. Proc. 2002-22, TIC arrangements with up to 35 co-owners can be structured as direct ownership (rather than a partnership interest) if they satisfy specific management and decision-making requirements. TICs are more complex to document than DSTs but allow greater flexibility in how the co-owners manage and eventually sell the property.

The California Trap: FTB Clawback on Out-of-State Replacement Property

California conforms to federal § 1031 — but with a significant catch that most real estate attorneys and CPAs outside California do not know about. If you exchange California property for out-of-state replacement property, California defers the gain on the exchange but requires annual reporting on Form 3840 until the replacement property is eventually sold. When it is sold, California taxes the original deferred gain, even if you have since left California.

Here is the mechanics. Under California Revenue and Taxation Code § 18032, a California-source exchange that involves out-of-state replacement property triggers an annual reporting obligation. Each year, the taxpayer must file Form 3840 (California Like-Kind Exchanges) disclosing the exchange, the deferred gain, and the current status of the replacement property. The Form 3840 obligation continues until the replacement property is sold in a taxable transaction.

When the replacement property is eventually sold — even decades later, even after the taxpayer has moved out of California — California asserts tax on the deferred gain from the original California exchange. The theory: the gain was California-source income when it arose, the taxpayer elected to defer it, and the California-source character of that gain does not disappear just because the replacement property is in Nevada.

This is the trap most California investors miss. They complete the exchange cleanly, move the equity into Texas or Arizona, stop filing California returns because they are no longer California residents, miss the Form 3840 obligation, and eventually sell the replacement property without notifying California. The FTB then asserts the deferred gain plus penalties and interest, sometimes years after the sale.

Two specific scenarios where we see this problem:

• California residents exchanging into out-of-state property. The FTB follows the gain. Annual Form 3840 is required regardless of where you live or where the replacement property is located. If you leave California after the exchange, you still owe this obligation and need to budget for California tax on the eventual sale of the replacement property.
• Former California residents who moved before the exchange. If you were a California resident when you owned the relinquished property and accumulated the gain, California may still assert sourcing rights on the deferred gain depending on the facts. This is a more contested area but one where we see FTB audits.

If you are a California resident contemplating a § 1031 exchange into out-of-state property, we model the California tax obligation before you commit to the exchange structure. In some situations — particularly where the replacement property is likely to be sold within a few years — a straight taxable sale, combined with other deferral strategies, produces a better net outcome than a § 1031 exchange that preserves the California clawback obligation.

One more California note: California has its own like-kind exchange rules for California-to-California exchanges under R&TC § 18031, which tracks federal § 1031 with California basis adjustments. For in-state-to-in-state exchanges, the federal analysis governs and there is no Form 3840 obligation.

1031 and Estate Planning: Swap Till You Drop

The most powerful feature of a 1031 exchange is not the deferral — it is the combination of deferral with the stepped-up basis at death. If the taxpayer dies holding the replacement property, heirs inherit it at fair market value under IRC § 1014. The deferred gain disappears permanently.

This is the “swap till you drop” strategy. An investor who acquires a $500,000 rental property, exchanges into a $1.2M replacement property, exchanges again into a $2.5M commercial building, and dies holding that building — that investor’s heirs take the building at its $2.5M date-of-death fair market value. The carried-over basis from the original purchase, reduced further through each exchange, is irrelevant. The entire accumulated gain — deferred through each exchange, California clawback obligation and all — is permanently extinguished at death.

For high-net-worth investors with large accumulated real estate gains and estate planning goals, the 1031 exchange is frequently part of a broader exit conversation. The decision tree: if you need liquidity now, sell and pay the tax. If you need liquidity eventually but not urgently, exchange into a larger asset and revisit at the next transition point. If your goal is to pass appreciated real estate to heirs, exchange and hold indefinitely — the step-up eliminates the deferred gain at death.

The interaction with the California clawback is important here. The Form 3840 obligation runs with the California-source gain. At the taxpayer’s death, the California gain is also stepped up under R&TC § 18036 conformity to § 1014. The clawback obligation is extinguished along with the federal deferred gain. Heirs inherit the property free of both the federal deferred gain and the California-source tracking obligation.

For investors in this position, the estate plan typically coordinates 1031 exchange strategy with revocable trust ownership, irrevocable trust gifting (for estate-tax-exposed investors), and the overall real estate portfolio succession plan. We work with estate counsel on these matters and can refer to trust counsel when the estate planning component is primary. Our tax advisory practice handles the transactional planning side.

Alternatives: Opportunity Zones and Installment Sales

A 1031 exchange is the primary deferral tool for investment real estate, but it is not the only one. Depending on the nature of the gain, the investor’s tax position, and whether the replacement property requirement is a practical constraint, two alternatives are worth evaluating: Opportunity Zone investment under § 1400Z-2 and the IRC § 453 installment method.

Opportunity Zone Investment (§ 1400Z-2)

The Opportunity Zone program allows a taxpayer who recognizes a capital gain to defer that gain by investing an amount equal to the gain in a Qualified Opportunity Fund (QOF) within 180 days of recognition. Unlike a 1031 exchange, the OZ program applies to any capital gain — real estate, stock, business interests — and does not require reinvestment in real property specifically.

The deferral runs until the earlier of the sale of the QOF investment or December 31, 2026, at which point the original deferred gain is recognized (as adjusted for any basis step-up earned by holding the investment through 2026). If the QOF investment is held for at least 10 years, the post-investment appreciation — everything above the invested gain amount — is permanently excluded from income under § 1400Z-2(c).

The OZ program is a complement to, not a substitute for, a 1031 exchange. Real estate investors with gain that does not qualify for 1031 treatment (property held for sale, stock, business interests) should evaluate whether a QOF investment achieves comparable deferral with the added benefit of post-investment exclusion on appreciation. The TCJA’s OZ provisions were extended and modified by subsequent legislation — confirm the current program status before structuring.

§ 453 Installment Sale

For investors who need partial liquidity but do not want to recognize the full gain in the year of sale, a § 453 installment sale allows gain to be recognized proportionally as principal payments are received over multiple years. The installment method is available alongside a partial 1031 exchange: exchange the equity you want to redeploy into replacement property, take the remainder as an installment note, and spread the taxable portion of the gain across the note’s payment schedule.

The installment method does not eliminate the California clawback problem on deferred § 1031 gain. It does provide a mechanism for managing the taxable boot from a partial exchange across multiple years rather than concentrating it in the sale year. And for investors who are fully liquidating and not exchanging, it remains a useful tool for spreading gain recognition when the buyer is willing to issue a note.

How Brotman Law Handles 1031 Exchange Transactions

Brotman Law approaches 1031 exchange engagements as transactional tax matters, not administrative paperwork. The legal analysis begins before the relinquished property closes and runs through the replacement property acquisition and any ongoing California Form 3840 obligations.

What we do on a standard deferred exchange engagement:

• Pre-closing review. Review the sale contract to confirm it includes the proper exchange cooperation language and that the assignment to the QI can be properly executed before closing.
• QI selection and vetting. Identify and review qualified intermediaries, confirm fund segregation and insurance, and review the exchange agreement for compliance with Treas. Reg. § 1.1031(k)-1. We do not have referral arrangements with QIs — we recommend based on the QI’s qualifications, not compensation.
• Exchange agreement review. The QI’s exchange agreement is the controlling legal document. We review and, when needed, negotiate the terms — particularly the notice provisions, receipt prohibition language, and identification procedures.
• Identification letter preparation. A properly formatted, timely, signed written identification delivered to the QI before day 45. We draft it; you sign it; we track the deadline.
• Replacement property review. Confirm the replacement property qualifies as like-kind, the exchange satisfies the value and equity requirements, and any boot exposure is understood before closing.
• California Form 3840 analysis. For California-source exchanges into out-of-state property, we advise on the ongoing reporting obligation and model the eventual California tax exposure on a sale of the replacement property.

For reverse exchanges and improvement exchanges, the engagement expands to include EAT formation and operation, financing coordination, and active timeline management through the 180-day period. These engagements are structured as fixed-fee projects so the scope is clear before we start.

We work with your CPA, your commercial real estate counsel, and the title company. The exchange closes as one coordinated transaction, not as separate engagements running in parallel without communication.

Written by Sam Brotman, JD, LLM (Taxation), MBA. Last updated June 2026.