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A 1031 exchange lets you sell an investment property and defer the capital gains tax by buying replacement property. The catch is the clock. The IRS gives you two hard deadlines, and missing either one can turn a tax-deferred exchange into a fully taxable sale. This free calculator takes your closing date and shows both dates, how many days you have left, and what has to be done by each one.
This tool is for education only. It is not tax or legal advice. Talk to your qualified intermediary and your CPA before you rely on any date.
How this calculator works
The 45-day identification deadline
You have 45 calendar days from the day you transfer the property you sold to identify replacement property in writing. The list must be signed and delivered to your qualified intermediary (QI) by midnight on day 45. Day 1 is the day after closing, so a closing on October 1 puts the deadline on November 15.
The 180-day exchange deadline
You must close on the replacement property by the earlier of two dates: 180 days after the transfer, or the due date (including extensions) of your tax return for the year you sold. For most sales, 180 days is the earlier date. Sales that close in the fall can run into the return date first. For example, a December 1 closing has a 180-day date in late May, but the return due date is April 15 unless you file an extension. That is why the calculator asks whether you have filed one.
The return due date logic
The calculator uses April 15 of the year after the sale, or October 15 if you have extended. If those dates land on a weekend or a legal holiday, the tax return deadline moves to the next business day, and the calculator does the same. Your CPA can tell you whether an extension makes sense for your situation.
Weekends and holidays do not help you
The 45-day and 180-day deadlines do not move for weekends or holidays. If day 45 is a Sunday, the list still has to be in by midnight Sunday. The practical advice is to deliver your identification early, ideally a week ahead. The only exception is a published IRS disaster-relief notice, which your QI or CPA would flag.
What has to happen by each date
- Before closing: hire a QI, sign the exchange agreement, and add exchange language to your sale contract. If the sale money touches your bank account, the exchange can fail.
- By day 45: give your QI a signed list of replacement properties. The common limits are three properties of any value, or any number whose total value is no more than 200% of what you sold, or more if you end up closing on 95% of the value you identified.
- By day 180: close on at least one identified property. Buy equal or greater value and reinvest all of the net proceeds to avoid taxable boot.
Reverse exchanges
In a reverse exchange you buy the new property first. An exchange accommodation titleholder holds title to one of the properties, and the same 45 and 180 days run from the date it takes title. Reverse exchanges are more complex and cost more, so work with an experienced QI and attorney.
Why Kentucky investors should start early
Louisville investors often sell a rental or small commercial property and look for the next deal at the same time. Good replacement options can be thin in any market, and financing, inspections and title work all take time. Many exchanges that fail do so because the buyer waited until day 30 to start looking. Build your target list before you close the sale, not after. If you want help with timing in Kentucky, see our 1031 exchange deadline help page and our guide to 1031 exchanges in Kentucky. To estimate the tax you may be deferring, try the capital gains and 1031 exchange estimator.
Assumptions
- Dates are counted in calendar days from the transfer (closing) date, under Internal Revenue Code Section 1031(a)(3).
- Days remaining are measured from today's date in your browser.
- The extension option assumes a timely extension request for the tax year of the sale.
- Only real property qualifies for exchanges under current law, and it must be held for investment or business use. Your own primary home does not qualify.
- Disaster-area postponements, partial-year or multi-asset exchanges, and related-party rules are not modeled.
Frequently asked questions
Do the 45 and 180 days overlap?
Yes. Both periods start on the same day, the transfer of the property you sold. The 180 days include the first 45, so you do not get 180 days after identifying. If you identify on day 45, you have 135 days left to close.
What if day 45 or day 180 falls on a weekend or holiday?
The deadline does not move. You must still meet it on that date, so plan to finish a business day or more early. Only a specific IRS disaster-relief announcement can extend the dates, and only for taxpayers it covers.
Why would my exchange period be shorter than 180 days?
The exchange period ends on the earlier of 180 days or your tax return due date for the year of the sale. If you sell late in the year and your return is due before day 180, the shorter period applies unless you file an extension. Ask your CPA to confirm before your closing.
Can I get more time if I cannot find a property?
Generally no. The IRS does not grant case-by-case extensions of the 45-day or 180-day periods. That is why many investors identify a backup property and line up financing early.
Do I need a qualified intermediary?
In practice, yes. A QI holds the sale proceeds so you never have control of the money, which is what keeps the exchange valid. Hire one before you close the sale. This calculator does not replace your QI's guidance.
Questions about your dates? Text or email Rob at Winner Realty and we will help you plan your timeline. Browse more free calculators on our tools page.