1031 Exchange Deadline Calculator
45-day identification and 180-day exchange completion deadlines.
These calculators are for informational purposes only and do not constitute legal, financial, or professional advice.
How the 1031 Exchange Deadline Calculator works
The 1031 Exchange Deadline Calculator computes the two hard deadlines that govern a like-kind exchange under Internal Revenue Code Section 1031: the 45-day identification period and the 180-day exchange completion period, both counted from the day the relinquished property closes — not from the date the exchange agreement was signed or any earlier milestone.
Both deadlines run in calendar days and are famously rigid: unlike many legal deadlines, they are not extended when the 45th or 180th day falls on a weekend, a holiday, or a day your qualified intermediary's office happens to be closed. There is effectively no administrative grace period, which is exactly why investors run this calculation the day the sale closes rather than waiting.
The 180-day deadline carries a second, less obvious constraint: it is also capped by the due date of the tax return for the year the relinquished property was sold, including any extension actually filed. If that return's due date falls before the 180th day, the earlier date controls — a detail that catches exchanges closing late in the calendar year off guard.
Worked example
A relinquished property closes on November 1. Counting forward, the 45-day identification deadline lands on December 16 and the 180-day exchange deadline lands on April 30 of the following year. But if the investor's tax return for that year is due April 15 and no extension is filed, the exchange must actually complete by April 15 — two weeks earlier than the 180-day count alone would suggest.
Frequently asked questions
Do weekends or holidays extend either deadline?
No. Both the 45-day identification deadline and the 180-day exchange deadline are calendar-day counts with no extension for weekends, federal holidays, or any other closure — a rarity among the deadlines this site tracks, and one of the most common ways an exchange fails.
Why would my real exchange deadline be earlier than 180 days?
Because the 180-day period is also capped by your tax-return due date (with extensions actually filed) for the year the relinquished property sold. If that filing deadline arrives before day 180, it — not the 180-day count — is the operative deadline for completing the exchange.
Is this tax advice?
No — this is general information based on IRC Section 1031 and its regulations, not tax or legal advice for a specific transaction. Like-kind exchange rules involve technical requirements around identification format, qualified intermediaries, and eligible property well beyond the two deadlines shown here — work with a qualified intermediary and a tax professional before relying on any date from this tool.