1031 Exchange in Real Estate: Rules, Timelines, and How to Defer Capital Gains

You bought a rental property in 2018 for $240,000. It's worth $400,000 today. Sell it outright and you're looking at federal capital gains tax on $160,000 of appreciation — plus depreciation recapture on whatever you've written off over the years. That's a tax bill potentially north of $40,000 before your state takes its cut. Or you could roll every dollar into a better property and defer that tax entirely.

That's what a 1031 exchange does. It's one of the most powerful tools in real estate investing, and it's been part of the tax code since 1921. But the rules are strict, the timelines are unforgiving, and getting it wrong means you owe the taxes anyway — plus penalties.

The Basic Mechanics

Section 1031 of the Internal Revenue Code allows you to defer capital gains taxes on the sale of investment property if you reinvest the proceeds into another like-kind property within specified timeframes. The property you sell is called the relinquished property. The property you buy is the replacement property.

To defer 100% of your capital gains, you must:

1. Reinvest all of the net proceeds from the sale (no cash-out)
2. Buy a replacement property of equal or greater value
3. Take on equal or greater debt on the replacement
4. Meet the 45-day identification and 180-day closing deadlines
5. Use a qualified intermediary to hold the funds

Miss any of these, and either the entire exchange fails (fully taxable) or you receive "boot" — the taxable portion of the exchange.

The 45-Day Identification Rule

You have exactly 45 calendar days from the closing of your relinquished property to identify potential replacement properties. You must submit this identification in writing to your qualified intermediary. The clock starts ticking the moment you close — weekends and holidays count.

There are three identification rules. You only need to follow one:

• 3-Property Rule: Identify up to 3 properties of any value. This is what most investors use.
• 200% Rule: Identify any number of properties, as long as the total fair market value doesn't exceed 200% of the relinquished property's sale price.
• 95% Rule: Identify any number of properties, but you must close on 95% of the total identified value. This one is almost impossible to hit in practice and rarely used.

The 45-day window is tight. If you close your relinquished property and then start your property search, you're already behind. Start identifying replacement candidates before you close the sale — ideally before you even list the relinquished property.

The 180-Day Closing Rule

You have 180 calendar days from the sale of your relinquished property — or the due date of your tax return for the year of the sale, whichever comes first — to close on your replacement property. There are no extensions. The IRS has not granted extensions for COVID, hurricanes, or market volatility. A few disaster-area exceptions exist, but they're rare.

That "whichever comes first" clause is a trap that catches investors. If you sell your relinquished property in October and your tax return is due in April (without extension), your closing deadline might be April — not the full 180 days. Filing a tax extension extends your return deadline and therefore gives you the full 180 days. Talk to your CPA about this before the exchange, not after.

Like-Kind Property: Broader Than You Think

The "like-kind" requirement is one of the most misunderstood parts of the 1031 exchange. It does not mean you have to exchange a house for a house. Any U.S. investment real estate is like-kind to any other U.S. investment real estate. This includes:

• Single-family rentals into multifamily apartment buildings
• Commercial office space into industrial warehouse
• Raw land into a fully operational retail strip
• A vacation rental into a net-lease commercial property
• Your portion of a TIC (tenancy in common) interest into a DST (Delaware Statutory Trust)

The only hard lines: the property must be held for investment or productive use in a trade or business — not personal use. Your primary residence doesn't qualify. A vacation home you use personally for more than 14 days per year likely doesn't qualify. And a fix-and-flip property held primarily for resale won't qualify either, because it's treated as inventory rather than a capital asset.

House flipping does not qualify for 1031 exchange treatment. The IRS views properties held primarily for resale as dealer property, not capital assets. If you flip and resell within 12 months, you're paying ordinary income tax rates — not capital gains rates — and no 1031 exchange will help you.

Your Basis Carries Over

When you complete a 1031 exchange, you don't start fresh with a new basis on the replacement property. Your adjusted basis from the relinquished property carries over to the replacement.

Here's what that means in practice. Say you bought the relinquished property for $240,000, took $30,000 in depreciation over the years, and sold it for $400,000. Your adjusted basis is $210,000. You exchange into a $550,000 replacement property. Your basis in the new property starts at roughly $210,000 (adjusted for the additional equity you brought in and the difference in debt), not $550,000.

This matters because depreciation on the replacement property is calculated from that lower basis. You also inherit the depreciation recapture liability from the relinquished property. The tax isn't erased — it's deferred.

A Real Example: Sell $400K, Buy $550K

Let's walk through a complete exchange scenario:

• Relinquished property sale price: $400,000
• Original purchase price: $240,000
• Accumulated depreciation: $30,000
• Adjusted basis: $210,000
• Gross gain: $190,000 (sale price minus adjusted basis)
• Existing mortgage paid off at closing: $180,000
• Net equity (exchange funds): $220,000
• Replacement property purchase price: $550,000
• New mortgage: $330,000
• Capital gains tax deferred: all of it — $0 owed at exchange

In this scenario, you rolled $220,000 in equity into a $550,000 property, took on more debt than you had before (satisfying the equal-or-greater-debt rule), and deferred the entire $190,000 gain. The $30,000 in depreciation recapture still exists as a future liability — but it's a future problem, not a current one.

Boot and Partial Exchanges

Not every exchange has to be all-or-nothing. If you don't buy a property of equal or greater value, or if you take some cash out, you'll have a partial exchange. The portion that doesn't get reinvested — the boot — is taxable in the year of the exchange.

Boot comes in two forms:

• Cash boot: Cash you receive because the replacement property is cheaper than the relinquished property
• Mortgage boot: Net debt relief when the mortgage on the replacement is less than the mortgage on the relinquished property

You can offset mortgage boot with cash — meaning you can put extra cash into the replacement to make up for taking on less debt. What you can't do is offset cash boot with mortgage.

The Qualified Intermediary Requirement

You cannot touch the exchange funds at any point. That's the rule. If the proceeds from the sale of your relinquished property flow through your bank account — even for a day — the exchange is disqualified.

A qualified intermediary (QI) is a third-party company that holds your exchange funds between the sale and the purchase. They must be someone who isn't your agent — not your attorney, your CPA, your real estate agent, or anyone else who has had a principal relationship with you in the past two years. You hire a dedicated QI company.

QI fees run $800 to $1,500 for a standard exchange. That's not the place to cut corners. There have been cases of QI fraud where the intermediary absconded with exchange funds, so use a reputable company with bonding, E&O insurance, and a solid track record. Your title company or real estate attorney can usually refer you to someone they trust.

Depreciation Recapture Still Applies

This catches people off guard. A 1031 exchange defers capital gains tax. It does not eliminate depreciation recapture. Every year you've taken depreciation on the relinquished property, you've reduced your basis and created a recapture liability taxed at 25% federally when you eventually sell.

When you exchange, that recapture liability transfers to the replacement property. When you eventually sell the replacement without exchanging, you'll owe recapture on all the depreciation taken on both properties. This is the deferred tax that never quite goes away — unless you use the swap-till-you-drop strategy.

Swap Till You Drop

"Swap till you drop" is the colloquial name for the strategy of continuously exchanging into larger properties throughout your lifetime, deferring all capital gains and depreciation recapture indefinitely. When you die, your heirs receive the property with a stepped-up basis to fair market value at the date of death. The deferred gains and recapture liability disappear entirely.

This is a legitimate, legal strategy that real estate investors have used for decades. There are ongoing discussions in Congress about eliminating or limiting 1031 exchanges and stepped-up basis rules, so it's worth staying current on tax law changes — but as of today, both provisions remain in place.