1031 Exchange Timeline: The 45-Day and 180-Day Rules
A 1031 exchange runs on two deadlines that begin the moment your relinquished property closes. You have 45 calendar days to identify replacement property in writing, and 180 calendar days to close on it. They run at the same time, not one after the other, and neither can be extended by agreement. Almost every failed exchange fails on the first one.
1031 deadline calculator
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Day 45 · identification deadline
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Day 180 · exchange deadline
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Calendar days, counted from the closing date. Not extended for weekends or holidays. The 180-day period is the earlier of 180 days or your tax return due date for that year including extensions, so read the tax return trap below. This calculator is an educational tool, not tax advice.
Day zero: what actually starts the clock
Both periods begin on the date the relinquished property closes, meaning the date title transfers and the sale is complete. Not the date you listed it, accepted an offer, opened escrow, or signed a purchase agreement. The closing date is day zero and the following day is day one.
One condition has to hold for any of this to matter: the proceeds must never touch you. They go directly from closing to a qualified intermediary, an independent party who holds the funds and later sends them to the seller of your replacement property. If you take receipt of the money, even briefly, even into an account you intend to leave untouched, the exchange is over and the sale is taxable. The intermediary must be engaged before closing, which is the other common way exchanges are lost before they begin.
The 45-day identification period
By midnight on day 45 you must have delivered a written identification of your replacement property. Treasury Regulation 1.1031(k)-1(c) sets out what that requires:
- In writing. A conversation, an email to your agent, or a verbal instruction is not an identification.
- Unambiguous. A street address or legal description. For a DST, the name of the trust and the interest being acquired.
- Signed by you, the taxpayer completing the exchange.
- Delivered to the qualified intermediary, or to another person involved in the exchange who is not a disqualified person. Your own attorney, accountant, agent or employee generally does not count.
You can revoke and re-identify as many times as you want, in writing, before the deadline. After midnight on day 45 the list is fixed. You may acquire only what is on it.
The three identification rules
How many properties you may identify is governed by three alternative rules. You need to satisfy only one.
1
Three property rule
You may identify up to three properties of any value, and you may acquire any or all of them. This is the rule the large majority of exchangers use, because it has no valuation test to fail.
2
200 percent rule
You may identify any number of properties, provided their combined fair market value does not exceed 200 percent of the value of everything you relinquished. Useful when you want to spread an exchange across many smaller assets.
3
95 percent rule
You may identify any number of properties of any total value, but you must actually acquire at least 95 percent of the total value you identified. This is a fallback, and it is unforgiving: missing the threshold invalidates the identification entirely.
Most exchangers use the three property rule and identify their intended purchase plus one or two backups. The value of a backup is entirely in what happens if the primary deal collapses on day 60, when there is no legal way to identify anything new.
The 180-day exchange period
You must receive the replacement property by day 180. Not be in contract, not be in escrow. Closed and title transferred. The 180 days run from the same closing date as the 45, so by the time identification is settled you have 135 days left, not 180.
The tax return trap
This is the part that surprises people. Section 1031(a)(3)(B) sets the exchange period as the earlier of 180 days or the due date of your tax return for the taxable year in which the relinquished property was transferred, including extensions.
For an individual who closes in the second half of the year, that matters. Close on November 15 and day 180 falls in mid-May, but an individual return is due April 15. Without an extension the exchange period ends on April 15 and roughly a month of it disappears. Filing a valid extension restores the full 180 days. If you close in the fourth quarter, file the extension. It costs nothing and it is the difference between having your full period and not.
Weekends, holidays, and the absence of mercy
Most tax deadlines that land on a Saturday, Sunday or legal holiday roll to the next business day. The Section 1031 periods do not. They are counted in calendar days and the final day is the final day. If day 45 is Christmas Day, the identification is due on Christmas Day.
The one meaningful exception is federally declared disaster relief. The IRS periodically issues notices postponing Section 1031 deadlines for taxpayers in affected areas, generally under the framework of Rev. Proc. 2018-58. That relief is granted by notice, not on request, and you cannot plan around it.
What happens if you miss a deadline
The exchange fails and the transaction is treated as an ordinary sale in the year the relinquished property closed. The consequences arrive together: federal capital gains tax on the appreciation, depreciation recapture on everything you deducted over the holding period, the 3.8 percent net investment income tax if applicable, and state tax. In California, where state capital gains is taxed as ordinary income, that combined figure is substantial.
There is no partial relief for a good faith effort. This is the reason the identification list is worth taking seriously on day 30 rather than day 44.
Where a DST fits in the timeline
A Delaware Statutory Trust is assembled, financed and closed by its sponsor before it is offered to investors. There is nothing to negotiate and no loan to personally qualify for, so identifying one is paperwork rather than a transaction. Exchangers use that property in three ways:
- As the destination, when the goal is a passive interest rather than another property to manage.
- As a backup identification, so a collapsed primary purchase does not turn a deferred gain into a taxable one.
- To absorb residual proceeds, when the replacement property costs slightly less than the relinquished one and the difference would otherwise be taxable boot.
DST interests are securities and are offered to accredited investors. Which structure is appropriate depends on your exchange and your circumstances.
Have a licensed advisor review your exchange
If you are inside a 45-day window, tell us your closing date and a licensed advisor from Alta Investment Group will follow up. There is no cost and no obligation.
Timeline questions, answered
How long do you have to complete a 1031 exchange?
You have 45 calendar days from the closing of your relinquished property to identify replacement property in writing, and 180 calendar days from that same closing to complete the acquisition. The two clocks run concurrently, not consecutively, so the 180-day period includes the 45-day period. Both are counted in calendar days and neither is extended for weekends or federal holidays.
When does the 1031 clock start?
The clock starts on the date your relinquished property closes, meaning the date title transfers, not the date you accepted an offer, opened escrow, or signed a purchase agreement. The closing date itself is day zero, and day one is the following day.
Can the 45-day or 180-day deadline be extended?
Not by agreement, by the qualified intermediary, or by the IRS on request. These deadlines are statutory. The only routine extension comes from a federally declared disaster: the IRS periodically issues relief notices that postpone Section 1031 deadlines for affected taxpayers, typically under Rev. Proc. 2018-58. Absent that, missing a deadline ends the exchange.
What is the tax return trap in a 1031 exchange?
The 180-day period is actually the earlier of 180 days or the due date of your tax return for the year the relinquished property was sold, including extensions. If you close late in the calendar year, your return due date can arrive before day 180. Filing a valid extension restores the full 180 days. An exchanger who closes in November and files on time in April can lose weeks of the exchange period without realizing it.
What happens if the 45th day falls on a weekend or holiday?
Nothing changes. Unlike most tax deadlines, the Section 1031 periods are not extended when the final day falls on a Saturday, Sunday, or legal holiday. If day 45 is a Sunday, the identification is due that Sunday. Treasury Regulation 1.1031(k)-1 sets the periods in calendar days with no such adjustment.
How do I identify replacement property?
Identification must be in writing, must unambiguously describe the property (a street address or legal description; for a DST, the trust and the interest), must be signed by you, and must be delivered before midnight on day 45 to the qualified intermediary or another party involved in the exchange who is not a disqualified person. Telling your real estate agent does not count. You may revoke and re-identify as many times as you like, in writing, up until the deadline, and not after it.
What happens if I miss the 45-day deadline?
The exchange fails and the transaction is treated as a sale. The full capital gain becomes recognizable in the year the relinquished property closed, along with depreciation recapture and any applicable state tax and net investment income tax. There is no partial credit for having tried. This is why many exchangers identify a backup property alongside their primary target.
Why do exchangers identify a DST as a backup?
Because a DST is already acquired, financed, and closed by the sponsor before it is offered, it can be identified inside the 45 days and closed inside the 180 days without negotiating a purchase or qualifying for a loan. That makes it usable as a fallback if a primary purchase collapses after day 45, when there is no longer time to find anything else. It is also used to absorb residual proceeds that would otherwise be taxable boot.
Sources
- Internal Revenue Code Section 1031(a)(3), setting the 45-day and 180-day periods.
- Treasury Regulation 1.1031(k)-1, on deferred exchanges, identification requirements and the three identification rules.
- IRS Revenue Procedure 2018-58, on postponement of deadlines for federally declared disasters.
- IRS Form 8824, Like-Kind Exchanges, and its instructions.