Two clocks start the moment your property sells: 45 days to identify a replacement, 180 days to close. Miss either deadline, even by a day, and the exchange fails, which is why the timeline is worth mapping before you list.
A 1031 exchange runs on two hard deadlines. Miss either one and the exchange fails: no extensions, no exceptions. Everything else in the process is choreography around those two clocks.
Timeline at a glance
Phase | Window | What happens |
|---|---|---|
Pre-sale planning | Weeks or months before close | Engage QI, run numbers, build replacement-property pipeline |
Day 0 | Sale closes | Proceeds go to QI; both clocks start |
Days 1-45 | Identification period | Narrow candidates, submit written ID to QI by midnight on Day 45 |
Days 46-180 | Closing period | Execute purchase agreements, complete inspections, close on replacement |
Tax return | Following April (or extension) | File Form 8824 with your return |
Before the sale: planning phase
The best exchanges are decided before Day 0. Three things matter most.
Engage a qualified intermediary. The QI is the independent party that holds your proceeds between the sale and the repurchase, and the exchange agreement has to be signed before your sale closes. Shopping for a QI on closing day is a crisis.
Run your numbers. Use a 1031 tax savings calculator to estimate capital gains, depreciation recapture, the net investment income tax (NIIT), and state tax. A deferral that is small next to the constraints an exchange imposes may not justify the effort.
Build a replacement-property pipeline. Start reviewing markets, talking to brokers, and researching options such as Delaware Statutory Trusts (DSTs), a fractional-ownership structure that qualifies for a 1031. Three strong candidates on Day 0 turn the 45-day window into confirmation time instead of a scramble.
Also notify your real estate agent, title company, and closing attorney that this is a 1031 exchange. The closing documents have to route proceeds to your QI, not to your bank account. And consult a tax advisor to confirm your basis, depreciation history, entity structure, and state tax exposure.
Day 0: the sale closes
Day 0 is the day your relinquished property closes. Title transfers, proceeds are disbursed to your QI, and both clocks start:
- 45-day clock to identify replacement property in writing
- 180-day clock to close on it
You receive nothing. The funds sit in your QI's escrow account until you buy.
Right away, confirm three things with your QI: the exact dollar amount received, the precise Day 45 date, and the precise Day 180 date. Put both dates on every calendar you use.
Days 1-45: identification period
Sub-window | Priority actions |
|---|---|
Days 1-15 | Narrow candidates from your pipeline; begin due diligence on top picks; request DST offering materials if applicable; confirm financing pre-approval |
Days 16-35 | Finalize your identification list by roughly Day 30; make offers and negotiate terms; stay in close contact with your QI |
Days 36-44 | If you are behind, consider adding a DST as a backup (DSTs can close in 3-5 business days); use all three slots under the 3-Property Rule, which lets you identify up to three replacement properties |
Day 45 | Written identification must reach your QI before midnight; this deadline is absolute |
After Day 45 your list is locked. You cannot add, substitute, or revoke a property; you can only close on what you identified. Identify nothing and the exchange fails, and your QI returns the proceeds.
Common mistake: filling the list with properties you have not evaluated just to put three names on it. The list locks you in. Three bad options chosen in a panic are still three bad options.
Days 46-180: closing period
With the list locked, the work shifts to execution.
- Finalize purchase agreements on your chosen replacement property
- Complete inspections, appraisals, and financing
- Coordinate fund releases with your QI
- Watch for closing delays; if one identified property falls through, you can close on another from your list
Days 151-175: If you still haven't closed, daily contact with everyone involved keeps things moving. If a Day 180 close looks unlikely, a DST you identified as a backup can typically close in 3-5 days.
Day 180, the hard stop: You must have closed on the replacement property by Day 180, or by the due date of your tax return including extensions, whichever comes first. Being under contract on Day 180 counts for nothing if the deed records on Day 181.
The return-due-date trap: Sell in November with a return due April 15, and Day 180 may fall after that date, which makes April 15, not Day 180, your real deadline. Filing Form 4868 gets an automatic six-month extension, pushing the return due date to October 15 and preserving the full 180 days.
After closing
Your replacement property inherits the adjusted basis of the one you sold, with adjustments for boot (any cash or non-like-kind value you take out of the deal), exchange expenses, and related factors. That has three consequences:
- Depreciation starts from the carried-over basis, not the new purchase price
- Your future gain ties back to the original property's basis
- Sell later without exchanging again, and the entire deferred gain comes due
Report the exchange on Form 8824 with your tax return for the year of the sale. There is no limit on how many times you can do this; many investors exchange every 5-10 years, compounding equity tax-deferred over decades.
Example timeline: Maria's exchange
March 1 (Day 0): Maria closes on the sale of her San Francisco rental. Proceeds of $870,000 go to her QI.
March 1 - April 10: She reviews three multifamily properties she scouted before the sale and evaluates two DST offerings her advisor recommended.
April 10 (Day 40): She submits written identification to her QI: two multifamily properties and one DST.
May 15 (Day 75): Financing is approved for Multifamily Property 1, and she goes under contract.
June 20 (Day 111): A title issue surfaces. Closing is delayed.
July 10 (Day 131): The title issue is resolved and Maria closes, 49 days before her Day 180 deadline. Her QI releases the funds. Had the title problem dragged on, she could have closed on the DST instead.
The following April: Maria's CPA files Form 8824 with her tax return.
The 1031 timeline is unforgiving but predictable. The exchanges that go smoothly tend to have a replacement pipeline in place before Day 0, treat the 45-day window as confirmation rather than discovery, and use a tax extension to keep all 180 days available.
Frequently asked questions
What counts as Day 1 of the 1031 exchange timeline?
Day 0 is the date your relinquished property closes, when title transfers and proceeds are disbursed. Day 1 is the next calendar day. Both the 45-day and 180-day counts start from Day 0.
Are weekends and holidays counted in the 45 and 180 days?
Yes. Both deadlines count calendar days, not business days. If Day 45 lands on a Sunday or holiday there is no automatic extension, so the identification has to reach your QI before the weekend.
What if my property sale closes in December?
Your 180-day window runs into the following year, but your tax return for the year of the sale may be due before Day 180 arrives. Filing [Form 4868](https://www.irs.gov/forms-pubs/about-form-4868) gets an automatic extension that protects the full 180-day window.
Can I close on the replacement property before Day 45?
Yes. You can close any time after Day 0. You still have to formally identify the property, but identification and closing can happen on the same day.
What happens if I identify three properties and two fall through?
You can still close on the remaining one. The 3-Property Rule covers identifying up to three; you only need to close on one or more. That is exactly why backup options matter.
Can my QI help me find replacement property?
A QI handles the mechanics: holding funds, managing paperwork, tracking deadlines. Finding replacement property is not typically part of that. That falls to your real estate broker, advisor, or your own research.