1031 Exchange Timeline Calculator

Enter your sale closing date to instantly calculate your IRS 45-day identification and 180-day acquisition deadlines. See days remaining, exchange phase status, and optionally estimate how much capital gains tax you're deferring.

Created by Luis GonzalezLast updated: June 6, 2026

How to Use This Calculator

1
Enter the Sale Closing Date
Input the exact date your relinquished property officially closed. This is the starting point for your 45/180-day clock.
2
Enter Today's Date
Defaults to today. Adjust it to check deadlines for a past or future scenario.
3
Select the Exchange Type
Choose Standard Forward Exchange, DST / Tenants-in-Common, or Reverse Exchange. All types share the same 45/180-day rules.
4
Optionally expand Tax Deferral Estimate
Enter the sale price, cost basis, and combined capital gains tax rate to see how much tax you're deferring with this exchange.
5
Review your results
Examine the Identification Deadline, Acquisition Deadline, Days Since Sale Close, ID Days Remaining, Acquisition Days Remaining, and (if entered) Estimated Tax Deferred. Below the results, the visual timeline shows your exchange phase and the IRS rules summary.

Example Calculation

A real estate investor sold an investment property on March 15, 2026, and needs to understand their 1031 exchange deadlines as of April 1, 2026. The property sold for $500,000 with a $300,000 cost basis and a combined 20% capital gains rate.

Sale Closing Date

March 15, 2026

Today's Date

April 1, 2026

Exchange Type

Standard Forward Exchange

Sale Price ($)

500,000

Cost Basis ($)

300,000

Capital Gains Tax Rate (%)

Results

Identification Deadline

April 29, 2026 (28 days left); Acquisition Deadline: September 11, 2026 (163 days left); Days Since Sale Close: 17; ID Days Remaining: 28; Acquisition Days Remaining: 163; Estimated Tax Deferred: $40,000

Tips

Identify Early, Not Late

Aim to identify replacement properties within the first 20–30 days of the 45-day window, not the last 5. This gives you a buffer for unexpected delays and time to perform due diligence on your top choices.

Use the 200% Rule Strategically

If 3 properties aren't enough, you can identify more under the 200% rule — just ensure their combined fair market value doesn't exceed 2× the relinquished property's sale price. For a $500,000 sale, that means up to $1,000,000 in identified properties.

Remember the Tax Return Deadline

The 180-day window can be shortened if your tax return due date (including extensions) comes first. If you sold near year-end, file for an extension to preserve the full 180 days.

Estimate Your Tax Savings

Expand the 'Tax Deferral Estimate' section to see how much capital gains tax you're deferring. In our example, the $200,000 gain at a 20% combined rate means $40,000 in deferred taxes — a powerful incentive to complete the exchange on time.

The 1031 Exchange Timeline Calculator is an essential tool for real estate investors aiming to defer capital gains taxes on the sale of investment property.

By accurately pinpointing the crucial 45-day identification and 180-day acquisition deadlines, it helps investors avoid costly errors that could trigger significant tax liabilities.

Missing these deadlines by even a single day can convert a tax-deferred exchange into a fully taxable event.

For example, an investor who sold a property for $500,000 with a $300,000 cost basis would owe $40,000 in capital gains taxes (at a 20% combined rate) if they miss either deadline.

The Logic Behind 1031 Exchange Deadlines

The core of a successful 1031 exchange lies in adhering to two non-negotiable timelines: the 45-day identification period and the 180-day acquisition period.

Both begin on the day the relinquished property's sale closes.

Identification Deadline = Sale Closing Date + 45 calendar days
Acquisition Deadline = Sale Closing Date + 180 calendar days
ID Days Remaining = Identification Deadline − Today
Acquisition Days Remaining = Acquisition Deadline − Today
Estimated Tax Deferred = (Sale Price − Cost Basis) × Capital Gains Rate

Where:

Sale Closing Date is the date the relinquished property officially closed
Today is the current date used to calculate remaining days
Sale Price is the gross sale price of the relinquished property
Cost Basis is the adjusted basis (purchase price + improvements − depreciation)
Capital Gains Rate is the combined federal + state long-term capital gains rate

💡 To estimate the capital gains tax you'd owe without a 1031 exchange, try our Capital Gains Tax Calculator.

Worked Example: Calculating a 1031 Exchange Timeline

A real estate investor sold an investment property on March 15, 2026.

Today is April 1, 2026.

The property sold for $500,000 with a $300,000 adjusted cost basis, and the investor's combined capital gains rate is 20%.

Step 1: Calculate the Identification Deadline. March 15, 2026 + 45 days = April 29, 2026.

Step 2: Calculate the Acquisition Deadline. March 15, 2026 + 180 days = September 11, 2026.

Step 3: Calculate days elapsed and remaining.

Days Since Sale Close: April 1 − March 15 = 17 days (Identification phase, day 17 of 45)
ID Days Remaining: April 29 − April 1 = 28 days (On track)
Acquisition Days Remaining: September 11 − April 1 = 163 days (On track)

Step 4: Estimate the tax deferred.

Capital Gain: $500,000 − $300,000 = $200,000
Tax Deferred: $200,000 × 20% = $40,000

The investor has 28 days left to identify replacement properties and 163 days to close.

Successfully completing this exchange defers $40,000 in capital gains taxes.

💡 If you're considering a replacement property with rental income, our Rental Property Calculator can help you evaluate potential returns.

Compliance and Filing Context

The 1031 exchange, governed by Section 1031 of the Internal Revenue Code, allows investors to defer capital gains taxes when exchanging one investment property for another of "like-kind." The IRS rules allow three identification methods:

3-Property Rule: Identify up to 3 replacement properties of any value.
200% Rule: Identify any number of properties, provided their combined fair market value does not exceed 200% of the relinquished property's value. For a $500,000 sale, that means up to $1,000,000 in identified properties.
95% Rule: Identify any number of properties of any value, but you must acquire at least 95% of the aggregate value identified.

A Qualified Intermediary (QI) must hold all sale proceeds throughout the exchange.

Taking constructive receipt of the funds — even briefly — disqualifies the exchange.

The QI facilitates the transfer of funds from the sale of the relinquished property to the purchase of the replacement property.

How Professionals Interpret 1031 Exchange Timelines

Real estate attorneys, qualified intermediaries, and tax advisors use timeline outputs as critical project management tools.

A "Days Remaining" count below 10–15 for the identification deadline signals immediate urgency to finalize the property identification list.

If acquisition days remaining drops below 60, it triggers accelerated due diligence, financing, and closing preparation.

A well-managed exchange typically follows this pattern:

Days 1–20: Research and evaluate potential replacement properties
Days 20–35: Narrow choices and begin due diligence
Days 35–45: Finalize and submit written identification to QI
Days 45–150: Negotiate, inspect, finance, and close on replacement
Day 180: Absolute deadline — all transactions must be complete

Tight deadlines increase the risk of overpaying for a replacement property under time pressure.

Starting the identification process early provides the best outcomes.

Frequently Asked Questions

What is the 45-day rule in a 1031 exchange?

The 45-day rule requires you to identify potential replacement properties in writing within 45 calendar days of selling your relinquished property. The identification must be delivered to a qualified intermediary or other specified party. You can identify up to 3 properties of any value (3-property rule) or more under the 200% rule.

What is the 180-day rule for a 1031 exchange?

The 180-day rule requires that you close on the replacement property within 180 calendar days after the sale of the relinquished property, or by the due date (including extensions) of your income tax return for that tax year — whichever comes earlier.

Can 1031 exchange deadlines be extended?

Generally, no. The 45-day and 180-day deadlines are strict and cannot be extended. The only exception is for presidentially declared disaster areas, where the IRS may grant specific relief. For example, after major hurricanes, some deadlines have been extended by 60 days for affected taxpayers.

What happens if I miss a 1031 exchange deadline?

Missing either deadline disqualifies the exchange entirely. The transaction becomes a taxable sale, and you owe capital gains taxes on the full gain. For a $200,000 gain at a 20% combined rate, that means $40,000 in taxes that could have been deferred.

How much tax does a 1031 exchange actually defer?

The tax deferred equals your capital gain multiplied by your combined federal and state capital gains tax rate. For example, selling a property for $500,000 with a $300,000 cost basis produces a $200,000 gain. At a combined 20% rate (15% federal + 5% state), you defer $40,000 in taxes.

What types of property qualify for a 1031 exchange?

Both the relinquished and replacement properties must be held for investment or productive use in a trade or business. Personal residences and property held primarily for sale (like fix-and-flips) do not qualify. The properties must be 'like-kind,' which for real estate is broadly defined — any real property can be exchanged for any other real property.