The 1031 Exchange Clock: 45-Day and 180-Day Rules Explained

You closed the sale of a rental three weeks ago and you are only now starting to look at replacements. Or the wire from the title company landed in your operating account because nobody told you it should not. Either of those facts, on its own, can end a 1031 exchange before it really starts, and no amount of good faith afterward brings it back.

Section 1031 is a genuine deferral tool and an unusually unforgiving one. The rules are short. The deadlines inside them do not bend for good intentions.

What the exchange defers, and what it does not

A like-kind exchange under Section 1031 lets you sell investment or business-use real property and roll the proceeds into replacement real property without recognizing gain in the year of sale. The word doing the work is defer. Nothing is forgiven.

Two consequences follow, and investors routinely misread both.

Depreciation recapture rides along. Every year you held the property you were allowed depreciation deductions that reduced taxable income, and the code charges them against your basis whether or not you actually claimed them. When you eventually sell without exchanging, the portion of gain attributable to that depreciation, called unrecaptured Section 1250 gain, is taxed at a maximum rate of 25%, above the 20% top long-term capital gains rate, per IRS Topic no. 409, and the 3.8% net investment income tax can apply on top. If you ran a cost segregation study, the components reclassified as personal property recapture as ordinary income instead, and since 2018 they no longer qualify as like-kind at all. An exchange postpones that bill. It does not delete it.

Your basis carries over. The replacement property does not get a fresh cost basis equal to what you paid. You take a substituted basis, broadly your old basis adjusted for boot and any new cash invested. IRS Publication 544 walks through the computation, and the transaction is reported on Form 8824. A lower carried-over basis means less depreciation to claim on the new building, so some of the benefit is handed back across the hold period. That is usually still a good trade. It is not a free one.

The deferral can become permanent in one narrow circumstance: if you hold until death, heirs generally receive a stepped-up basis. That is an estate planning conversation with your attorney and CPA, not a reason to structure an exchange on its own.

Real property only, since 2017

Before 2018 you could exchange equipment, aircraft, artwork and other personal property. The 2017 tax law removed that. Exchanges are now limited to real property held for productive use in a trade or business or for investment. Treasury’s final regulations on the statutory limitation define what counts as real property for this purpose, including how incidental personal property in a deal is handled.

Note also what never qualified: your primary residence, a second home you use personally, and property held primarily for resale, which is to say the fix-and-flip. Intent at the time of the exchange governs, and it is a facts-and-circumstances question.

The intermediary rule: never touch the money

This is where exchanges die quietly.

If you take actual or constructive receipt of the sale proceeds, the exchange is over. Not delayed. Disqualified. The funds have to go somewhere you cannot reach them. Treas. Reg. section 1.1031(k)-1 sets out four safe harbors for this, including qualified escrow accounts and qualified trusts, but in practice almost every forward exchange runs through a qualified intermediary: an independent party who holds the money and acquires and transfers the properties on your behalf.

Two practical points. First, the intermediary must be engaged and the exchange agreement signed before the relinquished property closes. You cannot retrofit an exchange onto a sale that already happened. Second, “disqualified person” is broader than people expect: it generally captures your attorney, CPA, real estate agent or employee if they served you in that capacity within the two years before the transfer. Your regular CPA cannot be your intermediary.

Intermediaries are unregulated at the federal level, and only a handful of states — California, Nevada, Colorado, Washington and Virginia among them — license or bond them, so how much protection you have depends heavily on where your intermediary is based. Ask about segregated accounts, fidelity bonds and where funds are actually held. A handful have failed over the years and taken client money with them.

The 45-day clock

From the day title to the relinquished property transfers, you have 45 calendar days to identify replacement property in writing. Calendar days, not business days. Weekends and holidays count. The deadline does not move because day 45 lands on a Sunday.

The identification must be signed by you, delivered to the intermediary or another party to the exchange who is not you or a disqualified person, and received by midnight of day 45. It must describe the property unambiguously: a street address or legal description, not “a fourplex in East Austin.”

The three identification rules

You may list more properties than you intend to buy, within limits. Your identification has to satisfy one of three tests.

Rule	What it allows	Where it fits
Three-property rule	Up to three properties, at any value	The default, and enough for most single-replacement exchanges
200% rule	Any number, if combined fair market value is no more than 200% of what you sold	Buying several smaller assets out of one sale
95% rule	Any number at any value, but you must actually acquire at least 95% of the identified value	A backstop; missing it usually fails the exchange

You can revoke and re-identify inside the 45 days, in writing, with the same delivery requirements. After midnight on day 45 the list is frozen. If everything on it falls through, the exchange fails and the gain becomes taxable. Which year it lands in depends on timing: if the intermediary returns your funds in the same year you sold, the gain is recognized that year, but if the exchange period runs into the next tax year and the money does not come back until then, the installment-sale coordination rule in Treas. Reg. section 1.1031(k)-1(j)(2) generally lets you report the gain in the year you actually receive it. Ask your CPA which applies before you assume the worse year.

The 180-day clock, and the trap inside it

You have 180 calendar days from the transfer of the relinquished property to receive the replacement. Two details cause most of the damage.

It runs concurrently, not consecutively. The 180 days includes the 45. You do not get 45 plus 180. Spend the full identification window and you have 135 days left to close.

It is capped by your return due date. The exchange period ends on the earlier of day 180 or the due date, including extensions, of your tax return for the year the relinquished property transferred. Sell in late autumn and the 180 days can be cut short by the following spring’s filing deadline unless an extension is filed. If your sale closed after mid-October, talk to your CPA about extending before anything gets filed.

Federally declared disasters can postpone these deadlines under Rev. Proc. 2018-58. Relief is area-specific and date-specific, so confirm eligibility rather than assuming it.

Boot: how a working exchange still produces tax

Boot is anything you receive that is not like-kind property, and it comes in two forms.

• Cash boot. Proceeds you keep rather than reinvest, and in practice any non-transaction costs paid out of exchange funds.
• Mortgage boot. Debt relief. If the relinquished property carried a mortgage and the replacement carries a smaller one, that reduction is treated as value received unless you offset it with new cash.

The working rule practitioners use: to fully defer, buy replacement property of equal or greater value, reinvest all the net equity, and carry equal or greater debt. Recognized gain is generally limited to the lesser of realized gain or boot received, computed on Form 8824. Partial boot means partial tax, not a failed exchange.

Reverse and improvement exchanges

Reverse exchange. You buy first and sell after. Because you cannot own both properties at once and still qualify, an exchange accommodation titleholder parks one of them under the safe harbor published as Rev. Proc. 2000-37 in Internal Revenue Bulletin 2000-40, as later modified by Rev. Proc. 2004-51, which withdrew the safe harbor where you owned the intended replacement property at any point in the 180 days before the titleholder takes title. The 45- and 180-day clocks still apply, running from the parking date. These cost more, usually require cash or a lender comfortable with the structure, and have to be set up before anything closes.

Improvement exchange. Sometimes called a construction exchange. Exchange funds can be spent improving the replacement property while the accommodation titleholder holds title, but only improvements actually completed and in place by day 180 count toward exchange value. Work still in progress does not. On a tight schedule this gets oversold by promoters and underestimated by contractors.

The sequencing failure nobody plans for

The most common way an exchange comes apart is also the most avoidable: closing the sale before the replacement search was serious.

In a market with thin inventory, 45 days to find, negotiate and put a property under contract is not generous. The exchanges that work are the ones where the replacement is already identified, often already under contract, before the relinquished property reaches the closing table. Order it that way: line up the buy, then run the listing.

Other failure modes worth naming: financing that collapses on day 150 with no backup identified; a seller who will not close inside your window; an identification letter that describes a property ambiguously; and a partnership where one member wants cash and the others want to exchange, which is its own planning problem and needs attention months before the sale.

State rules and clawbacks

Federal deferral does not automatically mean state deferral. Most states conform, but several operate clawback provisions: they track gain deferred on property sold inside their borders and tax it when you finally cash out, even if by then you live and invest elsewhere. California is the most active, requiring an annual information return, Form 3840, for every year a replacement property is held after an exchange out of California real estate.

For Texas investors this cuts both ways. Texas levies no personal income tax, so an in-state exchange raises no state-level gain question, though the Texas franchise tax may still bear on how your holding entity is structured. Exchange out of a clawback state into Austin or Dallas and that state’s rules follow the deferred gain across the line. Check both jurisdictions, not only the one you are buying in.

The concrete next step

Before you list anything:

1. Ask your CPA whether the exchange actually beats paying the tax, given your basis, holding period and depreciation position. Sometimes it does not.
2. Engage a qualified intermediary in writing, before the relinquished property closes.
3. Start the replacement search now, across whichever of our market areas fits the thesis, and aim to be under contract by listing day.
4. Put day 45 and day 180 on a calendar with real reminders, and settle the filing-extension question early.
5. Line up property management for the replacement before closing, not after.

If you are working through a sale in Austin, Dallas-Fort Worth, Houston, Phoenix-Scottsdale, Miami or Nashville, our investment team runs the listing and the replacement search on one timeline and works alongside your CPA and intermediary rather than around them. Tell us the target closing date and we will build the search backward from it. Get in touch once you have that date.