Two separate clocks start ticking the moment your sale closes, and neither shows mercy: identification of replacement property is due within 45 days, while the closing itself must land within 180 days. Both figures come straight from the statute — every weekend and holiday counts against you — and the two periods run concurrently rather than back-to-back, so once the 45-day window closes, only 135 days remain to reach the closing table. Miss either cutoff and the exchange collapses into an ordinary taxable sale for that year.
Meeting the deadline is only step one. That same 45-day window also requires your identification to satisfy one of three IRS formats — the 3-property rule, the 200% rule, or the 95% rule — captured in a signed, written document delivered to your qualified intermediary. Sloppy identification can disqualify an otherwise timely deal. Florida adds no state-tax wrinkle here, so for local investors the entire exchange rides on these federal timing and identification mechanics.
Why Both Clocks Start Together
The countdown for both windows starts on the exact date you transfer the relinquished property — closing day, when the deed actually transfers, not the date you signed a contract. Every calendar day after that counts, and days 45 and 180 themselves are firm cutoffs, not approximate targets.
A common misreading treats the two periods as consecutive — 45 days, then a fresh 180. That is not how it works. Both start on the same closing date and run in parallel, so time spent identifying eats directly into your closing window. Use the full 45 days to pick property and only 135 days remain to actually close.
| Milestone | Timing | Counts weekends & holidays? |
|---|---|---|
| Deed transfers on the relinquished property | Day 0 — both clocks start | N/A |
| Cutoff for naming replacement property | Day 45 | Yes |
| Cutoff for closing on replacement property | Day 180 | Yes |
| Real-world closing runway if identification runs late | As few as 135 days | Yes |
Investors often miss a second constraint layered on top of the 180 days: the period actually runs until "180 days or your tax-filing deadline for that year, including extensions — whichever arrives first." Close near the end of the calendar year and an April filing deadline can quietly shrink your 180 days. If your exchange spans year-end, file an extension so the full 180 days stays available.
Rules for Naming Replacement Property
Your candidates need to go in writing within the 45-day window, delivered to your qualified intermediary or another party to the exchange who isn't disqualified from receiving it. Vague descriptions won't hold up — a street address or legal description is required, not "a building downtown." Three rules govern how you can identify, and you must pick one.
The 3-property rule
Name up to three candidate properties, no matter what they're worth individually or combined, then close on any one, two, or all three. Most investors default to this rule simply because it's straightforward and doesn't require valuing anything.
The 200% rule
List as many properties as you like, provided their combined fair market value stays under 200% of what you sold. This opens the door to more than three candidates when each one is relatively modest in price.
The 95% rule
Name an unlimited number of properties at any value, on the condition that you close on at least 95% of what you named by total value. Complex or large portfolios sometimes rely on this fallback, though few can actually clear the 95% bar.
A valid identification has to be in writing, carry your signature, and reach your qualified intermediary (or the replacement property's seller) before midnight strikes on day 45. Verbal understandings, notes to your own agent, or properties you merely intend to buy won't count. Revising the list is fine any time before day 45 — after that, it's frozen, and you're limited to whatever made the cut.
Where Exchanges Actually Fail
Bad property selection rarely sinks a 1031 exchange. What actually kills most deals is the calendar and the paperwork — preventable, mechanical slip-ups made under deadline pressure.
- Assuming a weekend day 45 automatically pushes to the following Monday, then missing the real deadline
- Naming a single property, watching that deal fall apart after day 45, and having nothing else on the list
- Closing on a lower-value replacement or taking cash out, which creates taxable boot even though the exchange technically went through
- Skipping the tax-return extension on a year-end exchange, which quietly cuts the 180-day window short
- Writing a description too vague to meet the unambiguous-identification standard
- Naming so many high-value candidates that the 200% rule gets violated
- Putting off financing until late in the 45-day window, then running out of runway to close by day 180
Name backups every time. The 3-property rule costs nothing extra, so list all three candidates even when you only plan to buy one. Should your top choice fall apart after day 45, having a named backup is what separates a completed exchange from a fully taxable sale — and naming just one property, with nothing behind it, is the single costliest identification mistake investors make.
Why the Clock Almost Never Stops
Both deadlines are written into the statute itself. Neither the IRS nor your qualified intermediary has the discretion to extend them just because financing fell through, an appraisal came in low, or a seller dragged their feet. The clocks run regardless.
Does NOT extend the deadlines
- A replacement deal falling through
- Financing or appraisal delays
- A weekend or federal holiday landing on day 45 or 180
- The seller of your replacement property stalling
- Your own scheduling conflicts or travel
Can extend the deadlines
- A federally declared disaster with IRS relief covering the exchange
- IRS disaster-relief notices that specifically postpone Section 1031 deadlines
- In practice, essentially nothing else
IRS disaster relief is the one genuine exception. Following a federally declared disaster — a Florida hurricane, say — the IRS sometimes issues notices that push back 1031 deadlines for taxpayers in the affected area. These postponements are narrow, temporary, and tied directly to the disaster declaration, so you can't plan around one before it's actually announced.
Working the Calendar in Reverse
Since the deadlines don't bend, it helps to plan backward from day 180 and build in a cushion at each step along the way.
| Task | Target |
|---|---|
| Line up your qualified intermediary and financing | Before the relinquished sale closes |
| Relinquished property closes and both clocks begin | Day 0 |
| Get replacement candidates under LOI or contract | Day 20–30 |
| Deliver your written identification to the QI | By day 40 (buffer before day 45) |
| Finish due diligence and financing on the chosen property | Day 45–150 |
| Close on the replacement property property property | By day 170 (buffer before day 180) |
| File a tax-return extension if the exchange spans year-end | Before your original filing deadline |
Every delayed 1031 exchange hinges on the same two numbers: 45 and 180. Both clocks start at closing, run at the same time rather than in sequence, and count weekends and holidays with zero room for discretionary extensions. Put your replacement property in writing by day 45 under one of the three identification rules, always with backups named. Close by day 180, matching or exceeding value and reinvesting all proceeds to steer clear of boot. Exchanges that straddle year-end need a filed extension to keep the full 180 days intact. Treat these numbers as fixed engineering constraints, not aspirational targets, and they're straightforward to manage.
Don't Let the Calendar Cost You the Exchange
A blown 45- or 180-day window converts a tax-deferred exchange into a fully taxable sale — which is why the calendar deserves as much attention as the paperwork itself. Reach out to our team before you close on the relinquished property, so your filings and your qualified intermediary stay in sync from day one.
Talk to Our TeamSources
- IRC Section 1031(a)(3) — Identification and receipt requirements (45-day and 180-day periods)
- IRS — Instructions for Form 8824, Like-Kind Exchanges
- Treasury Regulation Section 1.1031(k)-1 — Identification rules (3-property, 200%, and 95% rules)
- IRS — Like-Kind Exchanges Fact Sheet (FS-2008-18)
- IRS — Disaster relief guidance postponing Section 1031 deadlines (e.g., Rev. Proc. 2018-58 as applied in disaster notices)
Frequently asked questions
Both windows open on the identical date: the day your relinquished property's deed transfers at closing. From there you get 45 calendar days to name replacement property and 180 calendar days to close on it — and because the two run at the same time rather than one after the other, the 180-day count already includes those first 45 days.
Three formats are available: the 3-property rule, which lets you name up to three properties regardless of value; the 200% rule, which allows unlimited properties as long as their combined fair market value stays within 200% of your sale price; and the 95% rule, which permits unlimited properties of any value provided you end up closing on at least 95% of the total value you named.
Rarely, if ever. These periods come from the statute itself and run through weekends and holidays without pause — a day-45 deadline that lands on a Sunday is still day 45. The sole path to an extension is IRS disaster relief tied to a federally declared disaster. Financing hiccups, a collapsed deal, or simple bad luck won't buy you extra time.
You're limited to whatever made your written list. Once the 45-day window shuts, only property named during that window is eligible for purchase. If that lone candidate falls apart and nothing else was identified, you won't close within 180 days, the exchange fails, and the gain becomes taxable — precisely why seasoned investors always name more than one option.
