The 1031 Exchange Timeline: 45 and 180-Day Deadlines Explained

You're selling a rental property. You want to defer the capital gains.

The 1031 exchange lets you do that—but the clock starts the day you close. Miss the deadlines and the IRS treats it as a taxable sale.

Day 0: Close the Sale

The moment you close on the sale of your relinquished property, the exchange clock starts. That's Day 0.

Critical: the sale proceeds cannot go to you. They must go to a qualified intermediary (QI)—a third party who holds the funds until you close on your replacement property. If the money hits your bank account, the exchange is dead. No do-overs.

Your closing documents should specify the QI as the recipient of the funds. The title company wires the proceeds to the QI, not to you.

The 45-Day Identification Period

You have 45 calendar days from the closing date to identify your replacement property in writing. Not 45 business days. Calendar days. Weekends and holidays count.

You can identify up to three properties of any value. Or you can identify more than three if their combined value doesn't exceed 200% of the value of the relinquished property (the "200% rule"). Or you can identify any number of properties if their combined value doesn't exceed 95% of what you acquire (the "95% rule").

Most investors identify one to three properties and keep it simple.

The identification must be in writing, signed by you, and delivered to the QI (or the seller of the replacement property, depending on the structure) by midnight on Day 45. Email counts if the QI accepts it. Certified mail is safer for your records.

This deadline is hard. The IRS does not grant extensions. Not for illness, not for market conditions, not for anything. If you miss Day 45, your exchange fails. You owe the tax.

The 180-Day Closing Period

You have 180 calendar days from Day 0 to close on one of the identified replacement properties. Again, calendar days. The 180-day period includes the 45-day identification period—so you don't get 45 plus 180. You get 180 total, and the first 45 are for identification.

If your tax return due date (including extensions) falls before Day 180, the exchange period is cut short. You must close by your tax return due date. For most investors, that means April 15 of the following year (or October 15 if you extend). Plan accordingly.

Boot: Cash You Take Out Is Taxable

If you sell for $400,000 and buy a replacement for $350,000, you've taken $50,000 in cash—"boot." Boot is taxable. You've effectively cashed out part of your equity, and the IRS taxes that portion.

To defer all gains, you need to reinvest all the equity (and usually more, to avoid boot) into the replacement property. Or you can take some boot and pay tax on that amount. The choice is yours, but know the tradeoff.

The Qualified Intermediary

The QI is the middleman. They hold your sale proceeds. They disburse them at closing when you buy the replacement property. They're not your attorney, your accountant, or your real estate agent—they must be an independent third party.

Typical fee: $750–1,500 for a standard exchange. Shop around. Cheaper isn't always better—you want a QI with a solid reputation. If they go out of business or misuse the funds, your exchange can collapse.

What Qualifies as Like-Kind

Like-kind is broad for real estate. Any investment or business real estate in the U.S. can be exchanged for any other investment or business real estate. A single-family rental in Texas for a 12-unit apartment building in Ohio? Like-kind. A warehouse for a strip mall? Like-kind.

What doesn't qualify: your primary residence (unless you've converted it to a rental and held it as such), vacant land held for personal use, property outside the U.S. (in most cases). A duplex you've lived in for two years and then rented for three? That can qualify—you've held it as investment property. The rules have nuance. When in doubt, ask a tax pro before you close.

Common Mistakes

Missing the 45-day deadline. The number one killer of 1031 exchanges. Start looking for replacement properties before you close. Have a short list. Don't assume you'll find something in six weeks. We've seen investors lose six-figure tax deferrals because they closed on a Friday and didn't have their identification letter to the QI until Monday—Day 46. The IRS doesn't care.

Touching the funds. If you receive the sale proceeds, the exchange fails. The QI must hold them. The title company wires to the QI. You never see the money until it goes toward the replacement property.

Identifying too few properties. If your top choice falls through and you only identified one, you're stuck. Identify two or three to give yourself options. The 200% and 95% rules exist for a reason—use them if you need flexibility.

Not getting the identification in writing. Verbal doesn't count. Email or signed letter, delivered on time. Some QIs accept fax. Confirm with your QI before Day 45 what format they require.

Choosing the wrong QI. Your QI holds your money for up to 180 days. If they're undercapitalized, disorganized, or slow to respond, your exchange can fail. Check references. Use a QI that's been in business for years and has a clean record.

Closing on the wrong day. If you close on the relinquished property on January 15, Day 180 is July 14. Not July 15. Count carefully. Some investors assume they have "about six months" and miss by a day. The IRS does not round up.

Tax Implications of a Failed Exchange

If you miss the 45-day deadline or the 180-day deadline, or if you receive the funds, the exchange fails. You're treated as having sold the property. Capital gains tax (and depreciation recapture) apply. The deferral is gone.

That's why the timeline matters. Plan ahead. Use a QI from the start. Set calendar reminders for Day 44 (identification due) and Day 175 (closing window closing). One missed deadline can cost you tens of thousands in taxes. We've seen it. A $300,000 gain deferred becomes $90,000 in taxes if you miss the deadline. The calendar is your friend. Mark Day 45 and Day 180 now. Set two reminders. One for Day 44 (identification due tomorrow). One for Day 175 (closing window closing). Miss either and the exchange fails. No exceptions. The IRS does not grant extensions. For a full overview of scaling with 1031s—including reverse exchanges—see our portfolio scaling guide.