A 1031 exchange timeline runs on two hard deadlines: 45 calendar days from the sale of your old property to identify replacement property in writing, and 180 calendar days from that same sale to close on it. Both clocks start the day you transfer title to the property you’re selling, both count every day on the calendar, and missing either one turns the transaction into a taxable sale.1Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Real Property Held for Productive Use or Investment The tax you defer can be significant — long-term capital gains rates run from 0% to 20% depending on income, with a possible 3.8% net investment income surtax on top — so the deadlines deserve real planning.
When the Clock Starts
The statute measures both deadlines from “the date on which the taxpayer transfers the property relinquished in the exchange.”1Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Real Property Held for Productive Use or Investment In practice that means the closing date: the day the deed records, the settlement statement is signed, and funds disburse. Your closing disclosure is the document that fixes the date. Keep it where you can find it, because every day counted in the exchange runs from that page.
Both deadlines count calendar days. Weekends, federal holidays, and every other day on the calendar are inside the window. Neither deadline slides forward if it lands on a Saturday, Sunday, or holiday.2Internal Revenue Service. Like-Kind Exchanges Under IRC Section 1031
The 45-Day Identification Deadline
You have exactly 45 calendar days from the sale closing to tell your qualified intermediary, in writing, which properties you intend to buy. There is no extension, no grace period, no business-day cushion. If day 45 falls on a Sunday, the deadline expires at midnight that Sunday.
Forty-five days sounds comfortable until you factor in searching, inspections, and negotiating with sellers willing to wait for you. Most experienced investors have their replacement candidates lined up before the first closing, which turns the identification step into paperwork rather than a hunt. If you’re drafting an identification notice on day 44, something earlier in the process broke.
You can revoke and replace an identification any time before midnight on day 45. The revocation has to be written, signed by you, and delivered to the same person who received the original notice — usually the qualified intermediary. Once day 45 passes, the list is locked. No additions, no swaps, no substitutions, even if a deal later collapses.
How to Identify Properties
The identification notice has to describe each property clearly enough that anyone could find it: a street address, a legal description, or a recognized property name. You sign the notice yourself, and you deliver it to someone actually involved in the exchange, such as the qualified intermediary or the seller of the replacement property. Delivery to your attorney, accountant, or real estate agent does not satisfy the rule.2Internal Revenue Service. Like-Kind Exchanges Under IRC Section 1031
Treasury regulations cap how many properties you can list through three alternative rules:
- Three-property rule: up to three replacement properties, at any market value. This is the simplest and most commonly used approach.
- 200% rule: any number of properties, provided their combined fair market value does not exceed twice the value of the property you sold.
- 95% rule: if you exceed both prior limits, the identification still works only if you actually acquire at least 95% of the total value of everything you identified. In practice this is very hard to hit.
Identify too many properties without satisfying the 95% rule and the IRS treats you as if you identified nothing, which fails the exchange entirely.3GovInfo. Treasury Regulation 1.1031(k)-1 For most investors, the three-property rule is the safe path: a first choice, a backup, and one more just in case.
The 180-Day Closing Deadline
You have to take title to at least one identified replacement property within 180 calendar days of the original sale. The 180 days runs from the same starting point as the 45 days — they overlap. Once you use up your 45-day identification window, roughly 135 days remain to close.1Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Real Property Held for Productive Use or Investment
The 180th day does not shift for weekends or holidays either. Title transfer, deed recording, and fund disbursement all have to be finished by midnight on day 180. Your qualified intermediary uses the sale proceeds it has been holding to fund the purchase, so coordinate the wire and title logistics well before the last week. A delayed wire or a title snag can push a closing past the deadline, and there is no fixing it afterward.
The Tax Return Deadline That Shortens 180 Days
The 180-day window can shrink. The statute says the exchange must be completed by the earlier of 180 days or the due date of your federal tax return for the year of the sale.1Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Real Property Held for Productive Use or Investment Sell in October and file on the normal April 15 deadline and April 15 arrives before day 180. Your exchange period ends on April 15 in that scenario, not day 180.
The fix is a tax extension. The statute says the due date is “determined with regard to extension,” so an automatic six-month extension moves the return deadline to October 15 and restores the full 180 days.2Internal Revenue Service. Like-Kind Exchanges Under IRC Section 1031 Filing the extension does not increase your tax bill or invite IRS scrutiny; it only moves the filing date. If you sold in the second half of the year, the extension should be filed automatically.
Timeline Rules for Reverse and Improvement Exchanges
The 45- and 180-day deadlines apply the same way in variations of the standard forward exchange, but the mechanics change.
In a reverse exchange, you find the replacement property before selling the old one. An exchange accommodation titleholder acquires and parks the replacement property while you work to sell your original. Revenue Procedure 2000-37 provides a safe harbor: you identify the property you intend to sell within 45 days of the titleholder acquiring the parked property, and the exchange has to be completed within 180 days.4Internal Revenue Service. Revenue Procedure 2000-37 Miss 180 days and the safe harbor protection disappears, leaving you to argue the tax treatment without any presumptions in your favor.
In an improvement or build-to-suit exchange, you use exchange funds to construct or renovate on the replacement property. All improvements have to be substantially complete and the property has to be transferred to you within the 180-day window. Materials sitting on the site waiting to be installed on day 180 are not real property, so their value is treated as boot and taxed. Cost overruns and weather delays do not extend the deadline, so construction schedules for these exchanges need real slack.
Disaster Relief Extensions
The 45-day and 180-day deadlines can be postponed when the IRS issues disaster relief for taxpayers affected by a federally declared disaster. The authority sits in Revenue Procedure 2018-58, which lets the IRS extend both exchange deadlines for taxpayers who live or run a business in a designated disaster area. A presidential declaration or FEMA notice alone does not do it. The IRS has to issue its own specific relief notice for the postponement to apply, and the scope varies by disaster — sometimes both deadlines are extended, sometimes only one.
If you think you qualify, contact your qualified intermediary right away and document your eligibility. This is the only routine mechanism for getting more time on 1031 deadlines, and it only reaches affected taxpayers inside the designated area.
What Happens If You Miss a Deadline
Miss the 45-day identification, miss the 180-day closing, or violate the constructive receipt rules by touching the sale proceeds, and the transaction becomes a regular sale. You owe capital gains tax on the full profit in the year the original property was sold. For 2026, long-term capital gains rates are 0% on taxable income up to $49,450 for single filers and $98,900 for joint filers, 15% up to $545,500 and $613,700 respectively, and 20% above those thresholds.5Internal Revenue Service. Topic No. 409, Capital Gains and Losses Higher-income taxpayers may also owe the 3.8% net investment income tax on top.
The consequences reach past the tax bill. The qualified intermediary still holds your funds, and release timing depends on your exchange agreement, so cash may not be available when you expect it. If a purchase contract was written assuming the exchange would close on day 180 and the exchange collapses on day 46, you may lose the property under contract as well. Build exchange-failure contingencies into your purchase agreements even when you expect to close on time.
One planning note that changes the arithmetic on the entire strategy: if you complete exchanges throughout your lifetime and hold the final property until death, your heirs receive a stepped-up basis at fair market value. The gain deferred across every exchange in the chain is permanently eliminated and never taxed to anyone.