1031 Exchange Rules: The Requirements You Must Follow

A 1031 exchange is generous but strict. This complete guide covers every requirement — like-kind, held-for-investment, same taxpayer, equal-or-greater value, debt replacement, the qualified intermediary, the deadlines, and boot — so you can keep the deferral available under the current published rules, subject to eligibility.

The 1031 exchange rewards discipline and punishes shortcuts. Meet every requirement and you defer the entire gain; miss a procedural deadline and the exchange can fail outright; miss a value rule and part of your gain becomes taxable. The rules themselves are not complicated, but they are exacting, and they interlock — which is why understanding all of them together, rather than one at a time, is the difference between full deferral and an unpleasant surprise at tax time. This guide walks through every rule that governs a valid exchange, why each exists, the traps that catch investors, and how the pieces fit into a single, repeatable process.

The Five Pillars of a Valid Exchange

Strip the 1031 rulebook to its structure and you find five load-bearing requirements. First, both properties must be like-kind real property held for investment or business. Second, the transaction must satisfy the same-taxpayer rule. Third, to fully defer you must meet the equal-or-greater-value rule — reinvesting all equity and replacing all debt. Fourth, you must use a qualified intermediary and never take receipt of the proceeds. Fifth, you must meet the 45-day and 180-day deadlines.

Two of these are procedural (the QI and the deadlines) and three are substantive (like-kind, same taxpayer, and value). The procedural rules decide whether you have a valid exchange at all; the substantive value rules decide whether the deferral is complete or whether you've created taxable boot. The rest of this guide takes them one by one, then shows how they combine.

It's worth remembering the larger context: Section 1031 has applied to real property only since the 2017 Tax Cuts and Jobs Act, a framework the 2025 One Big Beautiful Bill Act made permanent. So before any other rule applies, the threshold question is simply whether you're exchanging qualifying real property.

The Like-Kind Property Requirement

Both the relinquished and replacement properties must be U.S. real property held for investment or business use. The phrase "like-kind" misleads many first-timers: for real estate it is remarkably broad and refers to the nature of the property as real estate, not its type, grade, or quality.

That means you can exchange across property types freely. An apartment building is like-kind to raw land; a warehouse to a retail store; a rental house to a Delaware Statutory Trust interest; farmland to an office building; and even to perpetual oil and gas royalties, which are real property. You are not confined to replacing what you sold with the same thing.

What does not qualify is just as important: a primary residence or true vacation home (personal use), property held primarily for sale such as dealer inventory or fix-and-flip stock, foreign real estate (not like-kind to U.S. property), partnership interests, and — since 2017 — any personal property or equipment. If you're unsure whether your asset is real property for these purposes, that's the first question to resolve with counsel.

The Held-for-Investment Requirement

Like-kind is necessary but not sufficient; the property must also be held for investment or for productive use in a trade or business. This is a question of intent and use, not a bright-line holding period. Property you bought to flip — to resell quickly in the ordinary course — is dealer inventory and doesn't qualify, no matter how like-kind it otherwise looks.

There is no statutory minimum holding period, but time helps demonstrate investment intent. Many advisors suggest holding both the relinquished and replacement properties for at least a year (and reporting across two tax years) as a practical guideline, though facts and circumstances ultimately govern. Properties acquired and quickly relisted, or interests acquired just to flip into an exchange, invite scrutiny.

The same intent test underlies why a primary residence converted to a genuine rental can become 1031-eligible over time, and why a rental converted to personal use loses eligibility. Document your investment intent — the leasing, the holding, the business use — because it's the foundation everything else rests on.

The Same-Taxpayer Rule

The taxpayer who sells the relinquished property must be the same taxpayer who acquires the replacement. The name on title — or the tax-disregarded entity behind it, such as a single-member LLC — must match on both sides of the exchange. This sounds simple but is one of the most common sources of trouble.

Partnerships and multi-member LLCs raise a specific problem: the partnership is the taxpayer, not the individual partners, so the partnership must do the exchange — individual partners can't simply take their shares and go separate ways inside the exchange. When partners want different outcomes, planning techniques like a drop-and-swap (distributing tenancy-in-common interests to the partners before the sale) or a swap-and-drop (after) are used, but they carry their own timing and holding-period risks and must be planned well in advance with counsel.

Trusts, disregarded entities, and revocable living trusts generally preserve same-taxpayer status when structured correctly. The key is consistency: whatever taxpayer or disregarded entity sells must be the one that buys.

The Equal-or-Greater-Value Rule

To defer the entire gain, the equal-or-greater-value rule has three parts that work together. You must (1) acquire replacement property of equal or greater value than the property you sold, (2) reinvest all of your net equity (the cash proceeds), and (3) replace any debt that was paid off.

Think of it as two ledgers that both must balance: equity and debt. If you sold a $600,000 property with $400,000 of equity and $200,000 of debt, full deferral requires a replacement worth at least $600,000, with your full $400,000 of equity reinvested and at least $200,000 of debt (or additional cash) on the new side.

Falling short on either ledger creates taxable boot. Buy cheaper and keep the difference, and that's cash boot. Take on less debt without adding cash, and that's mortgage boot. The equal-or-greater-value rule is really the gateway to understanding boot, covered below.

The Debt-Replacement Requirement

The debt rule trips up more careful investors than any other, because it's counterintuitive: you must replace not just your equity but your leverage. Debt that was paid off on the relinquished property must be matched by new debt on the replacement, or by adding equivalent cash out of pocket.

If your relinquished property had $300,000 of debt and your replacement carries only $200,000, you have $100,000 of debt relief — mortgage boot — unless you contribute $100,000 of additional cash. The IRS treats the reduction in your liabilities as value received.

The cleanest solution when you don't want to personally qualify for a new loan is a leveraged Delaware Statutory Trust, which carries pre-arranged, non-recourse debt at the trust level. Your beneficial interest comes with its proportionate share of that debt, replacing your old leverage automatically — no new loan application, no personal guarantee. This is one of the most common reasons retirees and investors with changing income use DSTs as replacement property.

The Qualified Intermediary Requirement

A deferred 1031 exchange legally requires a qualified intermediary (QI) to hold the sale proceeds between the sale of the relinquished property and the purchase of the replacement. You are not allowed to touch the money — that's the whole point of the QI.

The doctrine behind this is constructive receipt: if you have actual or even constructive access to or control over the proceeds, the IRS treats you as having received the cash, and the exchange fails. Routing funds through your own account, or having the ability to draw on them, counts as receipt even if you never spend a dollar. The QI holds the funds in a segregated account and disburses them directly to the replacement closing, keeping them out of your control.

Engage the QI before your relinquished property closes — ideally while the purchase and sale agreement is being negotiated. Engaging one after closing is too late and is the single most common fatal mistake. Because QIs are lightly regulated and hold your entire proceeds, choose one with segregated qualified accounts, dual-authorization controls, fidelity bonding, and adequate insurance.

The 45- and 180-Day Deadlines

Two deadlines begin the day your relinquished property's sale closes and run concurrently. Within 45 days, you must identify replacement property in writing, signed and delivered to your QI. Within 180 days, you must close on the identified property — or by your tax-return due date including extensions, if that's earlier.

Identification follows one of three rules. The 3-property rule lets you name up to three properties of any value. The 200% rule lets you name more than three, as long as their combined value stays within 200% of what you sold. The rarely used 95% exception lets you name any number, but only if you acquire at least 95% of the identified value.

These deadlines are counted in calendar days, including weekends and holidays, with no grace period and no extension on request. The most reliable protection is to pre-identify a fast-closing DST as a backup, so a stalled primary deal can't push you past day 180.

Avoiding Boot

Boot is any non-like-kind value you receive in an exchange, and it's taxable up to the amount of your gain even when the exchange is otherwise valid. There are two kinds, and avoiding both is how you achieve full deferral.

Cash boot is net sale equity you don't reinvest — money you keep. Mortgage boot is debt relief — the amount by which the debt you paid off exceeds the debt (or cash) you put on the replacement. The two can combine, as the worked example below shows.

Sell for $600,000 with a $200,000 mortgage ($400,000 equity). Buy a $500,000 replacement with a $100,000 loan: you've kept $100,000 in cash (cash boot) and dropped $100,000 of debt (mortgage boot) — roughly $200,000 of taxable boot. Buy a $600,000 replacement with a $200,000 loan, reinvesting all equity and replacing all debt, and you have zero boot and full deferral.

Scenario Result Why

Reinvest all equity + replace all debt Full deferral Equal-or-greater value met on both ledgers

Keep some cash proceeds Cash boot Unreinvested equity is taxable

Take on less debt, no added cash Mortgage boot Debt relief is treated as value received

Buy cheaper property Taxable shortfall Replacement below relinquished value

Exhibit 1 — How the value and debt rules produce full deferral or taxable boot.

What Disqualifies a 1031 Exchange

Beyond falling short on value, certain missteps disqualify an exchange entirely — converting the whole transaction into a taxable sale. The most common is constructive receipt: closing before a QI is engaged, or letting proceeds reach your control.

Others include missing the 45-day or 180-day deadline; exchanging property that isn't like-kind (personal-use, dealer inventory, or non-real property); a same-taxpayer mismatch where the buyer and seller differ; and invalid identifications that are vague, unsigned, or delivered to the wrong party. Related-party exchanges have their own two-year holding rules that can unwind the deferral if violated.

Each of these is avoidable with planning. The throughline is that the procedural rules — QI, deadlines, identification, same taxpayer — are strict and unforgiving, so they deserve the most attention up front.

Related-Party Exchange Rules

Exchanges between related parties — family members, or entities you control — are allowed but carry an extra rule designed to prevent basis-shifting abuse. When you exchange directly with a related party, both you and the related party generally must hold the properties you each received for at least two years. If either disposes of its property within that window, the original exchange is retroactively disqualified and the deferred gain becomes taxable.

The rule also reaches indirect arrangements. Buying replacement property from a related party through a qualified intermediary has drawn IRS scrutiny, particularly where the structure lets the related party cash out while you defer — the so-called related-party "swap" that shifts a low basis. Limited exceptions exist (for death, involuntary conversion, or transactions not principally tax-motivated), but they are narrow.