The 1031 Exchange: How Real Estate Investors Defer a Tax Bill That Would Otherwise Run Six Figures

Sell a rental property you’ve held for ten years and you might be looking at a $100,000 capital gains bill due in April. Or you can roll that money into a bigger property, defer every dollar of that tax, and let the compounding work on money you would have sent to the IRS.

That’s the core of a Section 1031 exchange. Not a tax elimination — a deferral. But for real estate investors, the difference between paying that bill now versus never (or much later) is enormous.

Here’s how it actually works.

What a 1031 Exchange Is

The IRS lets you swap one investment property for another “like-kind” property without recognizing the capital gain at the time of sale. The gain doesn’t disappear — it carries over into the new property’s cost basis. But you don’t write a check to the government this year.

For a Long Island investor selling a building with a $400,000 gain, federal capital gains tax alone (at 15–20%) is $60,000 to $80,000. Add New York state tax at up to 10.9% and you’re looking at $103,000 or more out the door — before you even factor in depreciation recapture. A 1031 exchange defers all of it.

The law for this is IRC Section 1031. It’s been around since 1954 and Congress has not touched it for real estate. As of 2026, it is fully intact.

What Qualifies

Both properties — the one you sell and the one you buy — must be held for investment or business use. That covers a lot of ground: single-family rentals, commercial buildings, vacant land, apartment complexes, industrial property. A single-family rental can be exchanged for an apartment building. A warehouse can be exchanged for a strip mall. “Like-kind” in real estate is broad.

What does NOT qualify:

• Your primary residence
• A vacation home you use personally (there are rules about how much personal use disqualifies it)
• Inventory — property you buy and sell as a dealer
• Personal property (equipment, vehicles) — Congress eliminated those in 2018, so only real estate exchanges qualify now

The Clock Starts the Day You Close

Once you sell the property — the “relinquished” property, in exchange terminology — two non-negotiable deadlines start running.

Day 45: You must identify the replacement property.

Within 45 calendar days of closing on your sale, you must deliver written identification of the replacement property to your Qualified Intermediary. That means a specific address or legal description. “A property somewhere in Nassau County” doesn’t count.

You can identify up to three properties regardless of value. Or you can identify more, as long as the total value doesn’t exceed 200% of what you sold.

There are no extensions. Day 45 falls on a Sunday? It’s still Day 45.

Day 180: You must close on the replacement property.

180 calendar days from your sale, you need to be at the closing table for the new property. Not under contract — closed. Again, no extensions.

Most investors who blow a 1031 exchange do it on the timeline. They sell, assume they’ll find something in time, and then scramble at Day 40. Start the property search before you list, not after.

You Cannot Touch the Money

This is the rule that catches people. The IRS requires that you never have “constructive receipt” of the sale proceeds. That means the money goes directly from the buyer to a Qualified Intermediary (QI) — a neutral third party that holds the funds during the exchange. If the proceeds hit your bank account, even for one day, the exchange is blown and the entire gain is taxable.

Choose a QI before you close on the sale. They’re relatively inexpensive — typically $800 to $1,500 — compared to the tax you’re deferring.

”Boot” — The Part That’s Still Taxable

If you receive any cash or non-like-kind property in the exchange, that’s called “boot” — and boot is taxable.

Say you sell for $800,000 and only buy a replacement for $700,000. You pocket $100,000. That $100,000 is boot and gets taxed now. To fully defer, you need to buy equal or greater value and reinvest all the proceeds.

Mortgage math matters here too. If the loan on your old property was larger than the loan on the new one, the difference is also treated as boot unless you cover it with cash.

The Deferred Tax Doesn’t Disappear

When you eventually sell the replacement property without doing another 1031, all the deferred gain comes due — plus any additional gain you’ve built up in the new property. You’re not eliminating the tax, you’re moving it forward.

But there’s a powerful end-game here. If you hold exchange-acquired property until you die, your heirs get a step-up in basis to fair market value. The deferred gain disappears entirely — it’s never taxed. That’s why some investors chain 1031 exchanges for their entire investing career and pass the portfolio to the next generation.

I’ve watched clients in their 60s shift their entire real estate strategy around this once they understood the step-up at death. In real estate, that is a long-term home run.

Depreciation Recapture Is Also Deferred — But It’s Still There

When you’ve been depreciating a building and you sell it, the IRS wants back the taxes you saved on those depreciation deductions. That’s “depreciation recapture,” taxed at a special 25% rate. A 1031 exchange defers that too — the recapture liability carries into your new property. But if you’re planning to sell eventually and exit the exchange chain, factor it in. I covered how depreciation recapture works in detail if you want the full picture.

When a 1031 Makes Sense

If you’re selling investment real estate and reinvesting in other real estate, a 1031 should be part of every conversation — and part of the business tax preparation we do for property owners. The costs are low, the potential deferral is substantial, and the mechanics are straightforward if you plan ahead.

It gets more complicated when you’re also thinking about putting that rental in an LLC or when the property is generating passive losses you’re trying to free up. Those are planning conversations worth having before the deal closes.

This post is for general information only and does not constitute tax or legal advice. 1031 exchange rules involve strict deadlines and requirements; individual situations vary. Consult a qualified tax advisor before initiating a like-kind exchange. Geiger Tax & Accounting, Amityville, NY — (631) 532-5622.