Reviewed July 10, 2026 by Samera Harvey, EA · Free Browser-Based Tool
1031 Exchange Deadline Calculator
Enter the relinquished-property transfer date to calculate the 45-day identification deadline, 180-day outside date, and earlier return-due-date limit.
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Calculate Your 1031 Deadlines
How the 1031 Deadline Calculation Works
A deferred exchange starts when the relinquished real property is transferred. Two periods run from that date at the same time: a 45-day identification period and an exchange period that can last no longer than 180 days. The exchange period can end sooner when the applicable federal income tax return is due before day 180.
The calculator adds 45 and 180 calendar days to the transfer date. If you enter the applicable federal return due date, including a valid extension, it compares that date with day 180 and displays the earlier date as the controlling completion deadline.
First clock
45-Day Identification Period
Replacement property must be identified in a timely written identification that satisfies the applicable rules. A property search, letter of intent, or verbal discussion does not itself establish a valid identification.
Second clock
Exchange Completion Period
Replacement property must be received by the earlier of day 180 or the federal return due date, including extensions, for the transfer year. Filing an extension can preserve the full period in some late-year exchanges.
What This Calculator Does Not Decide
- Whether either property is held for qualified investment or business use
- Whether a written identification satisfies the three-property or 200% rules
- Whether the qualified intermediary and proceeds restrictions are satisfied
- Whether taxpayer identity, related-party, or ownership rules create a problem
- How cash, debt relief, or other property creates taxable boot
- Whether a specific IRS disaster notice postpones a deadline
Use the Dates in a Complete Exchange Plan
Engage a qualified intermediary before closing and have the tax economics modeled before the transaction becomes irreversible. The educational 1031 exchange guide explains qualification, identification, boot, and basis. The 1031 exchange planning service applies those rules to a specific sale and replacement strategy.
Frequently Asked Questions
Does the transfer date count as day one of a 1031 exchange?
The standard calculation adds 45 and 180 calendar days to the date the relinquished property is transferred. The transfer date is effectively day zero for those calculations. Confirm the transfer date shown in the qualified intermediary and closing records.
Do weekends and federal holidays extend a 1031 deadline?
Generally no. The 45-day and 180-day periods use calendar days, and the standard rules do not move a deadline merely because it lands on a weekend or holiday. Specific IRS disaster-relief guidance can postpone certain time-sensitive acts for eligible taxpayers, so confirm any claimed relief before relying on it.
Why can my exchange period be shorter than 180 days?
The exchange period ends on the earlier of 180 days after the transfer or the due date, including extensions, of the federal income tax return for the transfer year. A valid filing extension can matter when a late-year transfer would otherwise run beyond the unextended return due date.
Does identifying a replacement property complete the exchange?
No. Timely written identification addresses the 45-day requirement, but the replacement property still must be received before the controlling exchange-period deadline. Identification rules, taxpayer identity, qualified use, proceeds, and transaction structure also matter.
Can this calculator tell me whether my exchange qualifies?
No. It calculates dates from the information entered. It does not test qualified use, like-kind status, identification validity, related-party restrictions, qualified intermediary requirements, boot, basis, state reporting, or disaster relief.
Official Sources & Review Standard
The deadline logic and explanatory content were reviewed against the following government sources on July 10, 2026. Always use current exchange documents and confirm later agency guidance.
Planning a Sale or Exchange?
Review gain, recapture, boot, ownership, replacement basis, and state reporting before the relinquished property closes.