A 1031 exchange takes a maximum of 180 calendar days from start to finish. The clock starts the day you close on the sale of your relinquished property and ends when you close on the replacement. Inside that window sits a stricter deadline: within the first 45 days, you must identify your replacement property in writing. Both deadlines are set by federal statute, count every calendar day including weekends and holidays, and carry no flexibility from the IRS in ordinary circumstances.
When the Clock Starts
Day zero is the closing date of your relinquished property, meaning the date the deed transfers and the settlement statement is finalized. Every calendar day after that counts toward both the 45-day identification deadline and the 180-day acquisition deadline. There is no pause for weekends, federal holidays, or bank closures. If day 45 falls on a Saturday or Christmas, that day is still your deadline.
This matters practically because closings require title companies, lenders, and escrow agents who don’t work weekends. If your deadline falls on a non-business day, everything needs to be wrapped up before that day arrives. Planning backward from your deadlines is more important than most investors realize until they’re scrambling on day 43.
The 45-Day Identification Deadline
Within 45 calendar days of selling your property, you must submit a written, signed document identifying the replacement properties you intend to buy. This document goes to your qualified intermediary (or to the person obligated to transfer the replacement property to you) and must describe each property clearly enough that there is no ambiguity. A street address or legal parcel description works. “A duplex somewhere in Phoenix” does not.
Federal regulations give you three ways to identify properties:
- The three-property rule lets you name up to three properties regardless of their combined value. This is the most common approach.
- The 200% rule lets you name any number of properties as long as their total fair market value doesn’t exceed twice the value of what you sold.
- The 95% rule is a safety valve: if you exceed both limits above, the exchange still survives, but only if you actually acquire at least 95% of the total value of everything you identified.
The identification window closes at midnight on day 45. After that, you cannot add, swap, or revise your list under any circumstances.1eCFR. 26 CFR 1.1031(k)-1 – Treatment of Deferred Exchanges If you identified nothing by then, the exchange fails entirely. Getting this document delivered early, with proof of delivery, is one of the simplest ways to protect yourself.
The 180-Day Closing Deadline
You must close on at least one of your identified replacement properties within 180 calendar days of selling the original property. The 45-day and 180-day periods run concurrently, so the identification phase eats into your total acquisition time. After identification, you have roughly 135 days left to complete due diligence, secure financing, and close.2Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Real Property Held for Productive Use or Investment
Closing even one day late kills the exchange. The IRS then treats the entire transaction as a straight sale, which typically triggers long-term capital gains tax at 15% or 20%, depreciation recapture taxed at up to 25%, and potentially an additional 3.8% net investment income tax if your income exceeds $200,000 (single) or $250,000 (married filing jointly).3Internal Revenue Service. Property (Basis, Sale of Home, Etc.) 54Internal Revenue Service. Net Investment Income Tax On a property with significant appreciation and years of depreciation, that combined hit can easily reach 30% or more of the gain.
The Tax Return Deadline That Can Shorten Your 180 Days
The 180-day period isn’t always 180 days. Federal law says you must close by the earlier of day 180 or the due date of your federal income tax return for the year you sold the property.2Office of the Law Revision Counsel. 26 USC 1031 – Exchange of Real Property Held for Productive Use or Investment This creates a problem for anyone who sells late in the year.
Say you close on your relinquished property on December 1. Day 180 falls around late May. But if you file your tax return by the standard April 15 deadline, your exchange window slams shut on April 15 instead. You just lost six weeks. The fix is simple: file IRS Form 4868 for an automatic extension, which pushes your filing deadline to October 15 and preserves the full 180-day window.5Internal Revenue Service. Get an Extension to File Your Tax Return The extension is free, takes five minutes, and protects the exchange. Forgetting to file it is one of the most expensive clerical mistakes in real estate tax planning.
Reverse Exchanges: Same 180 Days, Different Order
Sometimes you find the perfect replacement property before your current property sells. A reverse exchange lets you buy first and sell second, but the timeline stays the same. Under the IRS safe harbor established in Revenue Procedure 2000-37, an exchange accommodation titleholder takes title to the new property on your behalf through a qualified exchange accommodation arrangement. The entire transaction, including selling your original property, must still wrap up within 180 days.6Internal Revenue Service. Revenue Procedure 2000-37
The 45-day identification and 180-day completion deadlines still apply, just in a different sequence. The accommodation titleholder must be unrelated to you, must hold actual legal title to the property, and a written agreement must be signed before the titleholder takes title. Reverse exchanges cost more than standard forward exchanges because you’re paying someone to hold and finance a property temporarily. Most investors use them only when the replacement property is too good to pass up and the relinquished property hasn’t yet found a buyer.
When Deadlines Can Be Extended
The IRS has authority under Section 7508A to postpone tax deadlines by up to one year for taxpayers affected by federally declared disasters, significant fires, or military actions.7Office of the Law Revision Counsel. 26 USC 7508A – Authority to Postpone Certain Deadlines by Reason of Federally Declared Disaster, Significant Fire, or Terroristic or Military Actions When the IRS exercises this authority, it issues a notice specifying which deadlines are extended, for how long, and which geographic areas qualify. These extensions have historically applied to 1031 exchange deadlines, but each event requires its own IRS notice, and relief is limited to taxpayers whose principal place of business or residence falls within the declared disaster area.
Outside of these narrow federal declarations, the 45-day and 180-day deadlines are absolute. Personal emergencies, financing delays, title complications, seller disputes, and natural events that don’t trigger a federal declaration get no accommodation. Tax courts have consistently refused to create exceptions.
Planning the Timeline With a Cushion
Working backward is the safest approach. Pick a target closing date on the replacement property that sits at least a week or two before day 180. Have your qualified intermediary agreement signed before the relinquished property closes; if funds pass through your hands at any point, the exchange is disqualified.8Internal Revenue Service. Sales Trades Exchanges 2 Two more boundaries are worth knowing, because they interact with timing. The taxpayer who sells must be the taxpayer who buys, so any entity restructuring should happen well outside the exchange window. And any exchange funds still held by the intermediary after day 180 come back to you as taxable boot, so a late close doesn’t just delay the exchange, it partially unwinds it.
Line up financing early. Order title work early. Identify well before day 45 rather than on day 45. Assume nothing will be extended, because in almost every case, nothing will be.