1031 Exchange Timeline: 45-Day and 180-Day Rules Explained

A 1031 exchange lets you defer capital-gains-tax-investor when you sell one rental property and buy another. But the IRS enforces two rigid deadlines: you have exactly 45 days to identify your replacement property, and 180 days to close. Miss either one by a single day and the entire tax deferral vaporizes.

The Two Core Deadlines

Section 1031 of the Internal Revenue Code permits like-kind exchanges—swaps of real property that allow you to defer tax on the gain. To qualify, you must follow two strict sequential deadlines.

The 45-Day Identification Deadline

After your relinquished property (the one you are selling) closes, you have exactly 45 calendar days to identify the replacement property or properties you intend to acquire.

“Identification” does not mean you need to make an offer, sign a contract, or commit to purchase. It means you must provide written notice to a qualified intermediary—a neutral third party that holds proceeds from your sale and oversees the exchange.

The notice must include:

• A clear legal description of each property you are identifying (street address is acceptable)
• The city and state
• A signed statement that you intend to exchange into these properties

The intermediary must receive this written identification by the end of the 45th calendar day. Email counts, as long as it reaches the intermediary before midnight on day 45.

Critical caveat: You cannot receive or control the sale proceeds directly. The qualified intermediary must hold the funds. If the money touches your account, the exchange dies immediately and the entire gain becomes taxable.

The 180-Day Closing Deadline

After your relinquished property closes (day 1), you have 180 calendar days to actually close on the replacement property (or properties). “Close” means the deed is recorded and legal title passes to you.

The 180-day clock runs continuously and cannot be paused. Weekends, holidays, and any other delays count. If your replacement closes on day 181, you miss the deadline and the exchange is invalid.

The 180 days and 45 days overlap: the identification deadline falls within the first 45 days of the 180-day window. You must identify by day 45 and close by day 180.

Counting Calendar Days: The Mechanics

The IRS counts calendar days from the day after your relinquished property closes.

Example: Your rental house closes on June 1. Day 1 is June 2. The 45-day identification deadline is July 16 (45 days later). The 180-day closing deadline is November 28.

• June: June 2–30 = 29 days
• July: July 1–16 = 16 days
• Total to day 45: 45 days ✓

Weekends, holidays (including federal holidays), and leap years do not suspend the clock. If day 45 falls on a Sunday, your identification is due on that Sunday. If your intermediary’s office is closed, you should have emailed or faxed before the close of business Friday.

The closing deadline is equally unforgiving. If you are negotiating to close on day 180 and the title company cannot close until day 181, you have lost the entire deferral.

The Three Identification Rules

The IRS offers three alternative ways to identify replacement properties. You may use only one.

Rule 1: The Three-Property Rule

You may identify up to 3 replacement properties, regardless of their value. This is the simplest approach for most small exchanges. You do not need to acquire all 3—you need only close on one. But you must identify exactly 3 or fewer, or your identification becomes invalid.

Example: Your relinquished house was worth $500,000. Within 45 days, you identify three potential replacements: a duplex in State A ($400,000), a cottage in State B ($350,000), and a commercial building in State C ($650,000). You are not required to acquire all three. If you later close on the cottage alone on day 150, the exchange is valid.

Rule 2: The 200% Rule

You may identify more than 3 properties if the aggregate fair market value of all properties identified does not exceed 200% of the value of your relinquished property.

Example: Your relinquished property was worth $300,000. You may identify replacement properties with a combined value of up to $600,000. You could identify 5 properties worth $120,000 each. You close on 2 of them (totaling $240,000). The exchange is valid—you do not need to close on all identified properties, only on properties worth at least the value you deferred.

Rule 3: The 95% Rule

If you identify more than 3 properties and the aggregate value exceeds 200%, you must close on properties worth at least 95% of the aggregate identified value.

Example: Your relinquished property was worth $300,000. You identify 6 properties worth a combined $750,000 (250% of the relinquished value). You must close on replacement properties totaling at least $712,500 (95% of $750,000) by day 180. This rule allows you to identify many properties but locks you into closing on most of them.

Most investors stick with Rule 1 (three properties) to avoid the complexity and risk of 95% closings.

What Counts as a Valid Closing

Your replacement property must close on or before day 180. “Close” means:

• The deed is signed and notarized
• The deed is recorded in the county recorder’s office
• Title passes to you
• Funds are disbursed

Contingencies, inspections, and appraisals do not delay the deadline. If your inspector finds problems and you need extra time to renegotiate, day 180 still ticks away. Many investors close on or before day 179 to provide a one-day buffer for recording delays.

If you identify property A but later decide to acquire property B instead, you may abandon A and close on B—provided you identified B within the 45-day window and close on B by day 180.

When the Deadlines Fall on Weekends or Holidays

If day 45 or day 180 falls on a weekend or federal holiday, the deadline is not automatically extended. However, the IRS allows a few narrow accommodations:

• If day 45 falls on a Saturday and you email identification Friday, that counts as timely.
• If day 180 falls on a holiday, you may close the next business day if the closing was arranged in good faith and the delay was beyond your control.

In practice, investors treat weekend deadlines as if they apply on Friday (the last business day). The IRS has been lenient on narrow technical delays if parties acted in good faith, but do not bet on it—treat the literal calendar day as your deadline.

The Consequences of Missing a Deadline

If you miss either the 45-day or 180-day deadline, no portion of the gain is deferred. The entire realized gain from your relinquished property becomes taxable in the year the original sale closed.

You will owe capital-gains-tax-investor, marginal-tax-rate-investor brackets, and potentially net-investment-income-tax-real-estate, as if you had sold and pocketed the cash.

Example: You sell a rental property in 2025 and realize a $200,000 gain. You plan a 1031 exchange. The IRS accepts your identification on day 42 (within the window). But your replacement property does not close until day 185 (five days late). The deadline was missed. In 2025, you report the full $200,000 gain on your tax return and pay tax as if the exchange never happened.

There is no such thing as a partial deferral. The exchange either works within the deadlines or it does not.

Using a Qualified Intermediary

A qualified intermediary is essential and non-negotiable. The intermediary must be an unrelated third party who holds the sale proceeds and oversees the exchange. Your real estate agent, accountant, or attorney cannot serve as the intermediary if they have had a relationship with you within the past two years (with limited exceptions).

The intermediary ensures:

• Sale proceeds do not pass through your hands (which would disqualify the exchange)
• Identification is properly documented and delivered on time
• Replacement property funds are disbursed on closing
• IRS regulations are followed

Fees for intermediary services typically range from $500 to $2,000 per exchange, depending on complexity.

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