The 180-day exchange period is the second hard deadline in a 1031 exchange — the date by which you must close on your replacement property. This guide explains how to count it, how it overlaps the 45-day period, and the tax-return wrinkle that can shorten it.
General information only — not tax, legal, or financial advice. A 1031 exchange has strict, unforgiving deadlines and significant tax consequences. Work with a CPA and a qualified intermediary (QI) before you act. A REALTOR® cannot serve as your QI. Verify current IRS and California FTB rules with a licensed tax professional.
How the 180-day clock works
Like the 45-day rule, you begin counting the day after your relinquished property closes. You then count 180 consecutive calendar days. The replacement property purchase must close on or before day 180.
- Record the closing/transfer date of your relinquished property.
- Day 1 is the next calendar day.
- Count 180 consecutive calendar days, weekends and holidays included.
- Close on all identified replacement property by day 180.
- Confirm the funds flow through your qualified intermediary, not your own account.
The tax-return shortening trap
Your exchange period ends on the earlier of (a) 180 days, or (b) the due date — including extensions — of your tax return for the year the relinquished property was sold. If you sell late in the year, filing your return before day 180 can cut the period short. Many exchangers file an extension to preserve the full 180 days.
If you sell in the fourth quarter, talk to your CPA about filing an extension so you do not lose days off the back end of your 180-day window.
Worked example
Say your relinquished property closes on May 1. Day 1 is May 2. Counting 180 calendar days forward puts your closing deadline on October 28. Because that is well before the following April tax deadline, the 180-day limit controls and no shortening applies. If instead you closed on November 15, your 180th day would fall after the April filing deadline — so unless you extend your return, the earlier tax-return date governs.
Concurrent, not sequential
A common misconception is that the 180 days begin after the 45-day identification period ends. They do not. Both clocks start the same day. By the time you identify on day 45, you have 135 days left to close.
- Day 0: relinquished property closes.
- Day 45: written identification deadline.
- Day 180: replacement property closing deadline.
Keeping the closing on schedule
Use a qualified intermediary; deadlines are strict and not extendable except by federal disaster relief. Build your replacement timeline to close well before day 180.
- Pre-qualify financing before you sell so the replacement loan does not slip past day 180.
- Order inspections and appraisals early on identified properties.
- Confirm title and escrow timelines with all parties up front.
- Build a buffer — never aim to close on day 180 itself.
How Brian helps
Brian manages the replacement-side transaction timeline alongside your QI, pushing escrow, lender, and inspection milestones so the closing lands comfortably inside 180 days — whether the replacement property is in Ventura County or out of state.
Frequently Asked Questions
When does the 180-day clock start?
The day after your relinquished property closes. Day 1 is the next calendar day, and you count 180 consecutive calendar days from there.
Do the 45 and 180 days run back-to-back?
No. They run concurrently from the same start date. After the 45-day identification deadline you have 135 days remaining of the 180.
Can my tax return shorten the 180 days?
Yes. The exchange period ends on the earlier of 180 days or your tax-return due date (with extensions) for the year of sale. Filing an extension often preserves the full 180 days.
Is the 180-day deadline extendable?
Only by federally declared disaster relief published by the IRS. Routine delays do not extend it.
What happens if I miss day 180?
The exchange fails and the gain on your relinquished property generally becomes taxable. Confirm consequences with your CPA.
Is this calculator tax advice?
No. It is general educational information. Verify your exact dates with a CPA and qualified intermediary.
