1031 Exchanges: What Actually Happens When You Sell an Investment Property

Most people learn about 1031 exchanges about two weeks too late.

The call usually goes the same way. Someone sold a rental they'd owned for fifteen years, the closing already happened, the proceeds are sitting in their checking account, and they're asking whether anything can be done about the tax bill. By that point, unfortunately, the door has closed. Once the sale proceeds reach your account, the transaction no longer qualifies as an exchange. That rule sits in the code itself, and if there were room in it, I'd be the first to tell you.

None of this is obvious, and nobody hands you a checklist when you decide to sell. So here is the version I'd walk you through if we were sitting down together, before the property goes on the market.

What is a 1031 exchange?

A 1031 exchange lets you sell real property held for investment or business use, reinvest the proceeds into other real property, and defer the capital gains tax rather than paying it that year.

Defer is doing real work in that sentence. The tax doesn't disappear. Your basis carries over into the new property, so the gain follows you and comes due whenever you eventually cash out. People sometimes hear "tax-free exchange" and understandably assume the liability is gone. It's waiting.

What makes the strategy worth the effort is what happens in the meantime. You keep the full pre-tax amount working for you instead of handing a sizable share to the IRS at every sale, and over three or four transactions that compounds into meaningful money. If you hold until death, your heirs generally take a stepped-up basis and the deferred gain goes away entirely. That last piece is a big part of why exchanges matter so much in family wealth planning.

What qualifies?

Real property held for investment or business use. Since the 2017 tax law, that's the whole list. Equipment, vehicles, and artwork used to qualify and no longer do.

"Like-kind" is broader than most people expect. It doesn't mean duplex-for-duplex. Raw land for an apartment building works. A rental condo for self-storage works. Almost any U.S. investment real estate can be exchanged for almost any other.

What doesn't qualify: your primary residence, which falls under a different rule (Section 121); property you bought to flip; and foreign real estate exchanged for U.S. property.

The 45-day and 180-day clock

The timing rules are the strictest part of all this, and they're where exchanges most often run into trouble.

The clock starts the day your sale closes. From there you have 45 days to identify replacement property in writing and 180 days to close on it.

Two details worth pinning down, because they surprise people. The two windows overlap rather than stack, so you have 135 days after identification, not 180. And the 180-day window is capped at your tax return due date, which means a fourth-quarter sale can quietly lose weeks off the back end. Filing an extension solves that, and it's an easy thing to forget.

The IRS won't extend these for holidays, financing delays, or a seller who backs out on day 170, so it's worth building in more room than you think you'll need.

The identification rules

You have to pick one of three ways to identify replacement property. Almost everyone uses the first.

If I could give you one piece of advice here, it's to identify backups. The three-property rule costs nothing extra, and having a second and third option is often what separates a clean deferral from an unexpected tax bill.

Why you can't hold the proceeds yourself

An exchange requires a qualified intermediary, sometimes called an accommodator. They hold the sale proceeds and acquire the replacement property on your behalf, so the money never passes through your hands. If it lands in your account, even briefly, even by accident, the exchange no longer qualifies.

One thing I like to say plainly: I can't serve as your QI. Neither can your attorney or your real estate agent. The code calls us disqualified persons. So there's no self-interest anywhere in this recommendation. The law simply requires an independent third party, and it's worth choosing carefully, because QI firms are lightly regulated and they'll be holding a great deal of your money.

Three questions I'd ask any QI you're considering: Are client funds held in segregated accounts? What's your fidelity bond and errors-and-omissions coverage? Who authorizes disbursements?

How much do you have to reinvest?

To defer the full gain, the replacement property needs to cost equal to or more than what you sold, and you need to reinvest all the equity and replace the debt you paid off.

Anything you keep is called boot, and boot is taxable. Cash boot is money that comes back to you at closing. Mortgage boot is debt relief. Sell a property carrying a $400,000 mortgage, buy one with a $250,000 mortgage, and that $150,000 gap is taxed as gain even though you never saw a dollar of it. That one catches almost everybody the first time.

It also helps to know what's actually in the tax bill you're deferring. Capital gains at 15% or 20% is only part of it. Depreciation recapture can run as high as 25%, there's a 3.8% net investment income tax for higher earners, and state tax sits on top. Together that can approach a third of the gain. The recapture piece is the one long-time landlords are most often surprised by, since it comes from deductions they took years ago and have long since forgotten.

Where exchanges usually run into trouble

In twenty years of this work, I've watched exchanges come apart in the same handful of ways. None of them are obvious in advance, which is exactly why they're worth flagging.

1. Starting the conversation after closing. The exchange has to be set up beforehand, and this is the one that can't be fixed later.
2. Identifying only one property. If that deal falls through on day 50, there's nowhere to go.
3. Buying down. Trading a $900,000 property for a $700,000 one leaves the difference taxable, and that's easy to miss when you're focused on the new property.
4. Overlooking debt replacement. Mortgage boot tends to stay invisible until the return is prepared.
5. Missing state rules. California, for example, requires ongoing annual reporting when you exchange California property into another state.
6. Letting the deferral drive the decision. A mediocre replacement property bought under deadline pressure can cost more than the tax would have. Sometimes paying the tax on a great sale is simply the right answer, and that's a fine outcome.

A client of ours nearly closed on a rental sale without setting up the exchange first. We caught it the week before closing, brought in a qualified intermediary, and identified three backup properties in the first two weeks. They ended up in a stronger asset and deferred roughly $180,000 in federal and state tax that would have been due that April.

Are 1031 exchanges going away?

Not at the moment. Proposals to cap deferral come up regularly, including one that didn't make it into the 2025 tax legislation. Section 1031 remains fully available for real property.

My guidance here is fairly dull, and I think that's appropriate. Plan under the law that exists, and don't rush into a deal you don't love because of a bill that hasn't passed.

If you're thinking about selling in the next year

A few things make everything downstream easier:

• Talk to your CPA before you list, not before you close
• Run the actual tax number on a straight sale, so you know what deferral is genuinely worth to you
• Line up a qualified intermediary early and ask how they hold funds
• Start looking at replacement property before your sale closes
• File an extension if you're selling late in the year

Every exchange is reported on Form 8824 with your return, and good documentation along the way makes that part straightforward.

If you're weighing a sale and want to think it through with someone before anything is on the market, that's exactly the conversation I'd rather have with you now than in two weeks.

Frequently asked questions

Craig Lloyd, CPA

Craig is the founder of The C Lloyd Group. For more than twenty years he has advised individuals and closely held businesses on real estate, investment, and personal tax planning. More about Craig →

This article is general information and not advice for your particular situation. Section 1031 outcomes depend heavily on specific facts, entity structure, and state law. Please talk with a qualified advisor before you act.