1031 exchanges: how to defer the gain without tripping on a deadline

By Tom, CPA · Updated October 25, 2026

TL;DR: A 1031 exchange lets you swap investment or business real estate for other like-kind real estate and defer the gain, as long as you hit the 45-day identification and 180-day closing deadlines, never touch the cash, and use a qualified intermediary. Cash or debt relief you walk away with ("boot") is taxable. The deferred gain follows you into the new property's basis.

Educational only, not tax, legal, or investment advice. Examples are illustrations, not predictions. Rules and limits change; verify current figures and talk to a qualified professional about your situation.

Lavish Larry sold a fourplex, saw a six-figure gain, and announced at a barbecue that he would "just 1031 it" sometime next year. Tax law heard this and quietly picked up a red pen. A 1031 exchange isn't something you do after the fact. It's a set of steps you arrange before the sale closes, with deadlines that run whether you're paying attention or not.

For FIRE-minded landlords, a 1031 can be a powerful way to keep compounding equity instead of handing part of it over at each sale: trading up from a high-maintenance duplex to a simpler property, moving to a cheaper market, or consolidating doors. This guide covers the rules as of Oct 2026, with official sources linked at the bottom.

CPA Warning Label: A 1031 deadline missed by one day is a missed deadline. There is no grace period for a slow title company, and once the cash is in your hands, the deal is done.

Like-kind rules

Under Internal Revenue Code Section 1031, if you exchange real property held for use in a trade or business or for investment solely for other like-kind real property, you generally recognize no gain or loss at the time of the exchange. A few key points from IRS guidance:

• Real property only. For exchanges after 2017, Section 1031 applies only to real property. Swaps of equipment, vehicles, artwork, collectibles, intellectual property and other personal or intangible property generally no longer qualify. (The IRS has also concluded in internal advice that certain crypto-for-crypto swaps did not qualify even under the old rules; see crypto and FIRE.)
• "Like-kind" is broad for real estate. Like-kind refers to the nature or character of the property, not its grade or quality. Raw land for a rental house, or an apartment building for a small commercial building, can work, provided both are held for investment or business use.
• Investment or business use on both sides. Your home doesn't qualify, and neither does property held primarily for sale, such as a flip. A vacation home that is mostly personal use generally doesn't qualify either. The IRS has a safe harbor (Rev. Proc. 2008-16) describing when a dwelling unit with limited personal use can be treated as investment property.
• Domestic for domestic. US real property and foreign real property aren't like-kind to each other.

The deal is reported on Form 8824 for the year you transferred the relinquished property.

Timelines

Most exchanges are "delayed" exchanges: you sell the old property first and buy the new one later. Two clocks start the day you transfer the old property:

The two periods run at the same time, not back to back. Day 180 is 180 days from the sale, not 180 days after day 45. And the "or your return due date if earlier" clause catches people who sell late in the year: a December sale can collide with an April filing deadline, which is one reason people file an extension.

Identification has its own rules about how many properties you can name and their combined value. These are worth reviewing with whoever handles the exchange, because naming too many properties without meeting an exception can blow the identification.

Illustration: Fran sells a rental on March 3. Her 45th day lands in mid-April and her 180th day in late August. If she identifies three candidate properties by the 45-day mark and closes on one of them by the 180th day, the timing is met. If she finds the perfect place on day 46, it's too late, no matter how perfect it is.

Qualified intermediary

The heart of a delayed exchange is that you can't receive the sale proceeds, not even for an afternoon. If you have actual or constructive receipt of the money, the IRS treats it as a sale and the gain is taxable. That's why exchanges use a qualified intermediary (QI), who holds the cash and steps into the chain of transfers.

• Your recent agent, such as someone who has served as your employee, attorney, accountant, broker or real estate agent within the prior two years, generally can't be your QI.
• The exchange documents need to restrict your access to the funds during the exchange period.
• Pick the intermediary before closing the sale. Bringing one in after the funds hit your account doesn't fix anything.

Not to be dramatic, but intermediaries hold large sums of other people's money. It's normal to ask how funds are safeguarded and whether the intermediary carries bonding or insurance.

Boot

"Boot" is anything you receive that isn't like-kind property: cash, a note, personal property, or relief from debt. You can still do an exchange with boot, but gain is recognized up to the amount of the boot. You can't recognize a loss in a like-kind exchange.

Two common ways boot sneaks in:

1. Cash out. You sell for $800,000, buy for $750,000, and the $50,000 difference comes back to you. That $50,000 is taxable to the extent of your gain.
2. Debt reduction. The old property had a $400,000 mortgage and the new one has $300,000. Being relieved of $100,000 more debt than you take on can be treated like receiving cash unless you offset it, for example by adding cash to the purchase.

Illustration: Larry's fourplex has an adjusted basis of $300,000 (after years of depreciation) and sells for $900,000 net, a $600,000 realized gain. He buys a $1,000,000 apartment building using all the exchange proceeds and a larger loan, and receives no cash. Recognized gain: $0. His basis in the new building is roughly the old $300,000 basis plus the extra $100,000 he invested in the purchase. That works out to about $400,000 against a $1,000,000 purchase price, which means smaller depreciation deductions going forward. Form 8824 does the exact math.

Deferral isn't forgiveness. The deferred gain, including prior depreciation that would otherwise be recaptured, carries into the replacement property. See real estate depreciation.

Step-up at death

This is where the strategy some investors call "swap till you drop" comes from. Under the general rule in IRS Publication 551, the basis of property inherited from a decedent is usually its fair market value at the date of death, not the decedent's old basis. A chain of 1031 exchanges defers the gain during life. If the owner dies while holding the property, heirs generally receive a basis equal to fair market value, and the deferred gain may never be taxed as income. Estate tax is a separate question. As of tax year 2026, the IRS basic exclusion amount is $15,000,000 per decedent, which is far above most FIRE estates.

Caveats worth noting:

• Community property, jointly held property, and trusts follow specific basis rules.
• Step-up rules are a recurring target of legislative proposals. Treat them as the law as of Oct 2026, not a promise.
• Holding property until death is a lifestyle choice too. A FIRE plan that requires you to manage rentals at 85 should be tested against the person you'll be at 85.

Other strategies people use alongside or instead of a 1031: selling and paying the tax, especially in a low-income early retirement year when part of the gain may land in the 0% or 15% long-term bracket (see the taxable account guide); converting a rental into a primary residence (see the restrictions in the Section 121 guide); or moving into REITs (REITs vs rentals).