The 1031 Exchange Timeline: 45 Days, 180 Days, and the Rules That Kill Deals

What a 1031 actually does

A Section 1031 exchange lets you sell investment real estate and buy other investment real estate without paying tax on the gain today. The gain does not disappear. It rides into the replacement property as a reduced carryover basis and waits there until you sell without exchanging again. Depreciation recapture rides along with it.

That is worth real money. A sale with $396,000 of realized gain and $100,000 of prior depreciation can carry a federal bill near $99,248 when you sell outright. Structured as an exchange with a modest amount of cash taken out, the immediate bill in that same scenario drops to $14,400 and roughly $84,848 is postponed. The full breakdown of that arithmetic is in depreciation recapture when you sell.

The catch is that a 1031 is not a tax strategy you apply to a sale. It is a structure you build around a sale, in advance, on a calendar that does not bend. Miss a date and the exchange simply becomes a taxable sale with extra paperwork.

Rule one: the intermediary comes before the closing

The most common way an exchange dies is that the seller closes first and asks about a 1031 afterward. There is no rescue from that position. You must engage a qualified intermediary and sign the exchange documents before the sale of the relinquished property closes.

The reason is a doctrine called constructive receipt. If the proceeds land in your bank account, or in your attorney's escrow on your behalf, or anywhere you could reach them, the IRS treats you as having received the money and the exchange fails. The intermediary exists so you never touch the funds. That is also why you cannot serve as your own intermediary, and why your regular CPA, attorney, or agent generally cannot serve either if they have worked for you recently.

Practical version: the moment you accept an offer on a property you might exchange, hire the intermediary. The fee is modest and it preserves an option worth tens of thousands.

Rule two: both clocks start together

You have 45 days to identify replacement properties in writing and 180 days to close on one. Here is the part that catches people: those clocks are concurrent, not sequential. Both start the day the relinquished sale closes. The 45 days sit inside the 180, they are not added to them.

I got this wrong the first time I looked at an exchange seriously. I read the two numbers, added them, and told a partner we had 225 days to find something. We had 180, and the useful part of that window is shorter still, because you cannot spend day 100 shopping for a property you never identified on day 45.

Both counts include weekends and federal holidays, and neither deadline slides to the next business day. Take a sale that closes on Tuesday, March 3, 2026. Day 45 is Friday, April 17. Day 180 is Sunday, August 30. The purchase has to be done by that Sunday, which in practice means the Friday before, because title companies and lenders do not fund on weekends.

• Day 0: relinquished property closes and both clocks start.
• Day 45: written identification must reach the intermediary by midnight, with no extension for weekends.
• Day 180: replacement property must be closed and acquired.
• Filing note: the 180 days can be cut short by your tax return due date for the year of sale, so a late-year closing may need an extension filed to preserve the full window.

Rule three: how identification actually works

Identification is a document, not a plan. It must be in writing, signed by you, delivered to your qualified intermediary before the 45-day deadline, and specific enough that a stranger could find the property. Street address or legal description, not a description of what you are hunting for.

You are not limited to one candidate, and you should not use one. The three-property rule lets you identify up to three properties of any value, and you can buy one, two, or all three. This is what most individual investors use, and it exists precisely so a single deal collapsing does not end the exchange. The 200% rule lets you identify any number as long as their combined fair market value stays within twice what you sold, so a $900,000 sale supports a list of up to $1,800,000. A third path, the 95% rule, permits an unlimited list if you actually acquire 95% of the value identified. It exists, it is rarely useful, and missing it fails everything.

What like-kind really means

Like-kind is far broader than the phrase suggests, and investors leave money on the table assuming otherwise. For real property held for investment or business use, essentially any US real estate is like-kind to any other. A duplex exchanges into raw land. A strip retail center exchanges into a rental house. A long ground lease exchanges into a warehouse.

The boundaries matter more than the categories. Personal property no longer qualifies at all, so equipment, vehicles, and artwork are out. Your primary residence is out. Property held primarily for resale is out, which is why a flipper's inventory does not qualify and a long-held rental does. And US real estate is not like-kind to foreign real estate.

One more that surprises people: the taxpayer who sold must be the taxpayer who buys. Selling in your own name and buying in an LLC you formed last week is a question to settle with your advisors before the sale, not at the replacement closing.

When the identified property falls through

Deals collapse. Inspections find things, sellers get cold feet, lenders reprice. If your only identified property dies on day 60 you cannot substitute a new one, because the list closed on day 45. What you can do is close on one of the others you were smart enough to identify.

If nothing on the list closes by day 180, the exchange fails and the sale is taxable in the year the relinquished property sold. The intermediary returns your funds at the earliest point the exchange agreement permits and you file as though you had sold outright.

This is the mechanical reason a rushed exchange is dangerous. A 180-day clock is excellent motivation for a seller to hold firm on price when they know your alternative is a tax bill, and I have watched investors overpay by more than the tax they were deferring. Run the numbers both ways in the 1031 exchange calculator before you commit. Sometimes selling, paying, and buying calmly is the better trade.

The calendar I keep

Before the property goes under contract I do four things. Engage the intermediary. Total the depreciation claimed to date, which the rental depreciation calculator reconstructs quickly and which every downstream number depends on. Estimate net proceeds with the seller net proceeds calculator so I know how much cash must be reinvested to avoid the partial tax bill covered in what is boot in a 1031 exchange. And start shopping for replacements before closing, because day 1 of 45 is a terrible day to begin looking.

Then two dates go on the calendar with reminders at 30 and 15 days out: identification day and closing day. Not the month, the date. There is no partial credit in this part of the code.

One last note in the same spirit as everything else on this site. This is arithmetic and a summary of published rules, not tax or legal advice. Exchanges involve entity questions, state rules, and financing details only your own CPA and attorney can weigh, so confirm the structure with them before you sign the listing agreement.