---
title: "The 1031 Exchange Timeline: How the 45-day and 180-day Clocks Really Work"
description: "A 1031 exchange gives you 45 calendar days to identify a replacement property and 180 days to close, both starting the day you sell. How the clocks really work."
published: "2026-08-15"
canonical: "https://blog.saltharborrealestate.com/blog/1031-exchange-timeline"
author: "Everitt Gill"
---

A 1031 exchange runs on two hard deadlines that both start the day you close on the sale of your investment property: 45 calendar days to identify your replacement property in writing, and 180 calendar days to close on it. The two clocks run at the same time, not one after the other, so the 45 days are part of the 180, not added on top. Everything is counted in calendar days, weekends and holidays included, and the IRS does not extend either deadline because you were busy.

That second sentence is where deals die. People hear "45 and 180" and pencil in almost eight months, when what they actually have is six. I once watched an investor lose the deferral on a marsh-front duplex because he spent six weeks shopping before he understood the 45-day window had already half closed. The math is unforgiving, but it is simple once you see it laid out on a calendar.

## When does the 1031 clock start?

Both deadlines start on the day your relinquished property closes, meaning the day the deed records and the proceeds leave the table. Not the day you sign a contract, and not the day you list. If your Fernandina rental closes on March 3, day one is March 4, your 45-day identification deadline is April 17, and your 180-day closing deadline is August 30. Those dates are locked the moment you sell.

Almost every 1031 today is a delayed exchange, where you sell first and buy later. That structure is exactly why the 45-day and 180-day deadlines exist: the IRS gave investors a defined window to find the replacement instead of forcing a same-day swap. (Buying first and selling later is a reverse exchange, where the same two clocks run in the opposite order. That is its own topic, covered on our [reverse 1031 page](https://blog.saltharborrealestate.com/blog/reverse-1031-exchange).)

One thing has to be true before that closing: a [qualified intermediary](https://blog.saltharborrealestate.com/blog/1031-exchange-qualified-intermediary) has to already be in place to receive the funds. You can never touch the proceeds yourself, not even overnight, or the exchange is dead before the clock starts. For the timeline, what matters is that the intermediary exists and is signed on before you close. Who can serve in that role, and what they charge, is covered separately.

## What is the 45-day identification rule?

Within 45 calendar days of selling, you must identify your replacement property or properties in writing, sign the document, and deliver it to your qualified intermediary. A verbal shortlist or a browser full of open tabs does not count. The identification has to describe each property clearly enough that there is no doubt which one you mean, usually by street address or legal description. You can change or revoke your list any time before day 45; once day 45 passes, it freezes.

You also have to stay inside one of three identification limits:

| Identification rule | What it lets you do |
|---|---|
| Three-property rule | Identify up to three properties at any value, and buy one, two, or all three. |
| 200% rule | Identify any number of properties, as long as their combined fair market value is no more than 200% of what you sold. |
| 95% rule | Identify more value than the 200% cap allows, but only if you then close on at least 95% of the total value you identified. |

Most investors use the three-property rule because it is the simplest and rarely a real constraint. The 200% rule comes into play when you are spreading proceeds from one larger sale, say a downtown commercial building, across several smaller rentals. The 95% rule is a trap dressed as an option: almost nobody can promise to close 95% of a long list, so treat it as a last resort, not a plan.

Miss day 45 and the exchange is over. There is no partial credit and no informal extension. Whatever you identified by 11:59 p.m. on day 45 is the entire universe of property you are now allowed to buy.

## What is the 180-day rule for 1031 exchanges?

You have 180 calendar days from the sale of your old property to take title to your replacement, and you can only buy from the list you locked in on day 45. There is no separate clock here. The 180 days include the first 45, so by the time identification closes you are already a quarter of the way through your total window. Closing on day 181 defers nothing.

The catch that surprises year-end sellers: your replacement has to close by the earlier of 180 days or the due date of your tax return for the year of the sale. Sell in November or December and your normal April 15 filing deadline can arrive before your 180 days are up, quietly cutting the window short. The fix is to file for an extension on that year's return, which restores the full 180 days. If you sell late in the year and a 1031 is on the table, talk to your CPA about the extension before you file anything.

## Do weekends, holidays, or hurricanes change the deadline?

Calendar days mean calendar days. If day 45 lands on a Sunday or Thanksgiving, it is still day 45, and the deadline does not roll to the next business day the way an ordinary tax filing does. There are two real exceptions, and one of them comes up here more than you would like.

When a hurricane triggers a federal disaster declaration for Nassau County and the surrounding coast, the IRS's standing disaster-relief rules can push both the 45-day and 180-day deadlines out, often to a single later date set weeks ahead. An investor caught mid-exchange when a named storm hits may qualify automatically based on the affected area, without filing anything special. This is not a strategy, since you cannot schedule a hurricane, but if you are in the middle of an exchange during an active declaration, read the relief notice before you assume you have blown a deadline. More than one Amelia Island exchange has been rescued by a September storm nobody wanted.

## How long must you own a property before you can do a 1031 exchange?

There is no fixed minimum holding period written into Section 1031. The law requires that both the property you sell and the one you buy be held for investment or for productive use in a business, which is a test of intent, not a stopwatch. In practice, many advisors suggest holding at least a year, partly so the investment shows up across two tax years, and the IRS has questioned exchanges on property flipped within months.

Holding period gets genuinely complicated when you later want to move into a property you acquired through an exchange, which pulls in a separate five-year rule and the homeowner exclusion. That is its own subject, covered on our [1031 five-year-rule page](https://blog.saltharborrealestate.com/blog/1031-exchange-5-year-rule). For a straight investment-to-investment swap, there is no magic number of days. Hold it, rent it, and document that you treated it as the investment it is.

## A realistic timeline, start to finish

Here is how the dates stack up for a typical exchange, using that March 3 closing:

- Day 0 (March 3): Old property closes and the proceeds go to your qualified intermediary, never to you.
- Days 1 through 45 (ending April 17): Tour and get a replacement under contract, then deliver your signed identification to the intermediary by day 45.
- Days 46 through 180 (ending August 30): Close on an identified property, sending the intermediary the funds and instructions so the purchase settles before the deadline.
- Day 181 onward: Too late. The deferral is gone and the gain is taxable.

The whole timeline rewards work you do before you ever sell. By the time the relinquished property closes, you want your intermediary signed, your target market scouted, and ideally a replacement already identified. When we list an investment property for a seller planning an exchange, we calendar both deadlines on the day we go under contract and work the search backward from day 45, because the buyer side is where these deals get tight. Forty-five days to find the right rental in thin coastal inventory is not long, and an August closing competes with peak season on the island.

None of this changes the broader rules of a like-kind exchange, the equal-or-greater-value requirement, the same-taxpayer rule, and the rest, which live on our [main 1031 rules page](https://blog.saltharborrealestate.com/blog/1031-exchange-rules). The timeline is just the part with the least mercy. The deadlines are firm, the IRS publishes them plainly, and a good intermediary will hold you to them. Miss one and the deferral disappears, and the gain you were rolling forward becomes taxable this year.