1031 Exchange Rules: Deferring Capital Gains on Real Estate

A 1031 exchange lets a real estate investor sell a property and reinvest the proceeds into a new property of the same type, deferring federal capital gains taxes and depreciation recapture until a future taxable sale. The deferral can be indefinite, and some investors use successive exchanges to roll gains forward across an entire real estate portfolio. To qualify, the transaction must satisfy strict rules about property type, identification deadlines, and how proceeds are handled.

What Is a 1031 Exchange, and Who Qualifies?

Named for Internal Revenue Code Section 1031, a like-kind exchange is available to any U.S. taxpayer who holds real property for use in a trade or business or as an investment. Individuals, corporations, partnerships, LLCs, and trusts may all use the provision.

What qualifies: Under the Tax Cuts and Jobs Act of 2017, only real property qualifies. Personal property, equipment, vehicles, artwork, and collectibles no longer qualify. The “like-kind” standard for real property is broad: a residential rental can be exchanged for a commercial building, raw land for a multifamily complex, a strip mall for a warehouse. The exchanged properties simply must both be real property held for productive use in a business or investment, not primarily for sale (i.e., a dealer’s inventory does not qualify).

What does not qualify:

• Primary residences (though a partial exclusion strategy exists when combined with Section 121)
• Real property outside the United States exchanged for U.S. property
• Properties held primarily for sale rather than investment or business use
• Personal property of any kind (since 2018)

The IRS Like-Kind Exchanges overview and the full text of 26 U.S.C. Section 1031 are the authoritative starting points for any exchange.

The Core 1031 Exchange Mechanics

Deferred Exchange Structure

Most 1031 transactions are “deferred” exchanges, meaning the investor sells the relinquished property first and then acquires the replacement property within the statutory window. Simultaneous exchanges happen rarely. The deferred structure requires a qualified intermediary (QI).

The QI is an independent third party who:

1. Takes assignment of the purchase and sale contracts from the taxpayer.
2. Receives the sale proceeds from the closing directly so the taxpayer never has constructive receipt.
3. Purchases the replacement property on the taxpayer’s behalf.
4. Transfers that property to the taxpayer to complete the exchange.

Using a QI who meets the safe harbor in Treasury Regulation Section 1.1031(k)-1(g)(4) is essential. If proceeds hit the taxpayer’s own account, even for a day, the IRS treats that as constructive receipt and the entire gain becomes currently taxable. Under Treasury Regulation Section 1.1031(k)-1(k), the QI cannot be a disqualified person, which includes anyone who served as the taxpayer’s employee, attorney, accountant, investment banker, or real estate agent or broker within the two years before the relinquished property closes.

The 45-Day Identification Rule

From the date the relinquished property closes, the taxpayer has exactly 45 calendar days to identify, in writing, the replacement property or properties they intend to acquire. There are no extensions for weekends, holidays, or good intentions. The identification must be:

• Written and signed by the taxpayer.
• Delivered to the QI (or another party involved in the exchange other than the taxpayer’s agent) on or before midnight of Day 45.
• Specific enough to identify the property by street address, legal description, or distinguishable name.

A vague reference such as “a multifamily property in Denver” does not satisfy the requirement. If no valid identification is made by Day 45, the exchange fails entirely.

The 180-Day Completion Rule

The taxpayer must actually close on the replacement property within 180 calendar days of the sale of the relinquished property, or by the due date of the tax return for the year of the sale (including extensions), whichever comes first. This is a frequent trap: if the relinquished property closes in October, the 180-day window may close before the April 15 return deadline, and requesting an extension to October may be necessary to use the full 180 days.

Identification Rules: Three Options

The IRS allows three alternative methods for identifying replacement properties. A taxpayer must comply with at least one.

The 3-Property Rule: Identify up to 3 properties of any value. This is the most commonly used approach because it is straightforward and does not require tracking aggregate values.

The 200% Rule: Identify any number of properties, provided their combined fair market value does not exceed 200% of the relinquished property’s sale price. This is useful when a taxpayer wants to keep more options open but can still estimate values.

The 95% Rule: Identify any number of properties of any combined value, provided the taxpayer ultimately acquires at least 95% of the total identified value. This rule is rarely practical because failing to close on a single identified property could invalidate the entire exchange.

Boot, Partial Exchanges, and Depreciation Recapture

What Is Boot?

“Boot” is any value received in the exchange that is not like-kind real property. It triggers gain recognition on the lesser of the boot received or the total gain realized. Boot takes two forms:

• Cash boot: The taxpayer receives cash from the QI, or the replacement property is priced lower than the relinquished property with no mortgage offset.
• Mortgage boot: Net mortgage relief, where the debt on the relinquished property exceeds the debt assumed on the replacement property. Mortgage boot can be offset by contributing additional cash at closing.

A partial exchange is intentional: the taxpayer intentionally takes some boot, recognizes tax on that portion, and defers the remainder. This can be a planning tool when a taxpayer needs some cash now but wants to defer the bulk of the gain.

Depreciation Recapture in a 1031 Exchange

A full exchange defers both capital gain and depreciation recapture. However, when the taxpayer eventually sells the replacement property in a taxable event, both the deferred gain and any additional depreciation taken on the replacement property will be recognized. Unrecaptured Section 1250 gain (depreciation on real property) is taxed at a maximum federal rate of 25%, which is higher than the long-term capital gains rates of 0%, 15%, or 20% that apply to the balance of the gain. If the taxpayer receives boot in a partial exchange, depreciation recapture is recognized first before regular capital gain.

For real estate held inside a partnership or LLC, additional rules apply, including Sections 704(c) and 1245/1250 gain allocations. Investors in these structures should consult their Modus tax advisor before proceeding.

2026 Status: What Changed (and What Did Not)

As of 2026, Section 1031 is unchanged from its post-TCJA form. The One Big Beautiful Bill Act (OBBBA), signed into law on July 4, 2025, was closely watched by the real estate industry because proposals had circulated in prior years to cap the deferral at $500,000 or to limit its use. None of those proposals appeared in the final legislation. Congress preserved Section 1031 without modification.

Key rules in force for 2026:

• Like-kind exchanges apply to real property only.
• There is no dollar cap on the amount of gain that can be deferred.
• There is no limit on how many times a taxpayer may use a 1031 exchange.
• The 45-day and 180-day rules are unchanged.
• The real-property-only restriction has no sunset date.

This stability matters for tax planning. Investors who delayed dispositions over legislative uncertainty can now proceed knowing the exchange mechanism remains available on the same terms.

Common Mistakes That Disqualify an Exchange

Even experienced investors trip on the following:

1. Missing the 45-day deadline. No exceptions exist outside of a federally declared disaster zone.
2. Using a disqualified intermediary. A QI who is the taxpayer’s own attorney, CPA, or recent agent will not satisfy the safe harbor.
3. Receiving proceeds directly. If the closing agent wires proceeds to the taxpayer instead of the QI, the exchange is over.
4. Vague property identification. “An apartment complex in Dallas” is insufficient. A street address or legal description is required.
5. Net mortgage boot. Selling a property with a $1 million mortgage and buying a replacement with a $700,000 mortgage creates $300,000 of mortgage boot unless offset with cash.
6. Dealer property. A developer’s inventory properties held for sale do not qualify, regardless of how long they have been held.
7. Related-party exchanges without proper holding. Under Section 1031(f), exchanges with related parties are permitted, but both parties generally must hold the exchanged properties for at least 2 years. An early disposition by either party retroactively disqualifies the exchange and triggers recognition of the deferred gain, subject to limited exceptions for death, involuntary conversion, and transactions lacking a tax-avoidance purpose.

1031 Exchanges and Broader Transaction Planning

A 1031 exchange is a powerful tool but rarely stands alone in a real estate transaction strategy. Common considerations include:

• Opportunity Zone funds (Section 1400Z-2): A taxpayer who receives taxable boot can reinvest that amount into a Qualified Opportunity Fund within 180 days to defer gain on the boot itself.
• Delaware Statutory Trust (DST) replacement properties: DSTs are a widely used vehicle for fractional 1031 exchange replacement when a taxpayer wants passive income without active management.
• Installment sales coordination: A 1031 exchange generally cannot be combined with installment sale reporting because the gain is deferred rather than recognized. Planning the sequence of transactions matters.
• Estate step-up: If a taxpayer holds a property acquired through a 1031 exchange until death, the heirs receive a stepped-up basis under Section 1014, eliminating the deferred gain entirely. This “swap till you drop” strategy is a legitimate planning approach that some investors use intentionally.

Modus advisors work with clients on the full spectrum of real estate transaction advisory services, from pre-sale structuring through post-acquisition integration.

Reporting a 1031 Exchange on Your Tax Return

A like-kind exchange is reported on Form 8824, filed with the taxpayer’s federal income tax return for the year in which the exchange occurred. The form captures the property descriptions, dates, values, realized and recognized gain, and the basis of the replacement property. The basis of the replacement property is the basis of the relinquished property, minus any cash boot received, plus any gain recognized and any additional cash paid. Tracking this carryover basis is important because it determines the future gain when the replacement property is eventually sold.

For multi-year or multi-property exchanges, working with a qualified tax preparer ensures the basis calculations are carried forward correctly and do not create surprises on a later disposition.

Related reading: Cost Segregation Study: How It Accelerates Depreciation

Frequently Asked Questions

Can I do a 1031 exchange on my primary residence?

No. A primary residence does not qualify because it is not held for use in a trade or business or as an investment. However, if a property served as a rental for a period and then was converted to a primary residence (or vice versa), a partial Section 1031 and partial Section 121 analysis may apply. These situations require careful structuring and documentation.

What is the minimum holding period before I can do a 1031 exchange?

There is no statutory minimum holding period in Section 1031. However, the IRS looks at whether the property was held for investment or business use rather than primarily for sale. Short holding periods, especially if the taxpayer had a plan to flip, can invite scrutiny. Two years is commonly cited as a comfortable marker, but the actual test is intent and use, not a fixed number of days.

Does a 1031 exchange eliminate the capital gains tax permanently?

No. A 1031 exchange defers the tax, it does not eliminate it. The deferred gain is embedded in the lower basis of the replacement property and will be recognized on a future taxable sale. The exception is if the taxpayer holds the property until death, in which case heirs receive a stepped-up basis and the deferred gain is never recognized.

Can a 1031 exchange be used for vacation homes or short-term rentals?

Vacation homes and short-term rentals can qualify if the taxpayer can demonstrate the property was held for investment rather than personal use. The IRS issued Revenue Procedure 2008-16 providing a safe harbor for vacation rental properties: the property must have been owned for at least 24 months before and after the exchange, rented at fair market value for at least 14 days in each 12-month period, and personal use must not exceed 14 days or 10% of rental days. Properties that miss this safe harbor are not automatically disqualified, but the burden of proof is higher.

What happens if I cannot close on the replacement property within 180 days?

The exchange fails for any portion not closed within the 180-day window. Proceeds held by the QI that were not used to acquire a replacement property are released to the taxpayer and become taxable as ordinary boot. The exception is a federally declared disaster, under which the IRS may administratively extend the deadline. No other extensions are available.

Can a single-member LLC or partnership use a 1031 exchange?

Yes, with important caveats. A single-member LLC disregarded for tax purposes is treated as the same taxpayer as the owner, so exchanges are straightforward. For multi-member LLCs and partnerships, the exchange must be conducted at the entity level, not the individual partner level. A common problem is when partners disagree on the reinvestment strategy; one partner cannot drop out of the partnership and do a personal 1031 exchange on their share unless the partnership is dissolved and the property distributed first, which requires careful advance planning.

*Modus is a national AI-native audit, tax, and advisory firm serving mid-market businesses. For questions about structuring a 1031 exchange or integrating it into a broader real estate tax strategy, contact the Modus tax team or visit our advisory services page.*