1031 Exchange Calculator

About the 1031 Exchange Calculator

A 1031 exchange (also called a like-kind exchange) allows real estate investors to defer capital gains taxes by reinvesting the proceeds from the sale of an investment property into another qualifying property. Named after Section 1031 of the Internal Revenue Code, this powerful tax strategy can defer tens or hundreds of thousands of dollars in taxes, allowing investors to compound their equity growth.

The rules are strict: you must identify a replacement property within 45 days and close within 180 days. The replacement must be of equal or greater value, and you must reinvest all equity to achieve full deferral. Any cash or debt relief not reinvested is called “boot” and is taxable.

This calculator determines the minimum replacement property value needed for full tax deferral, calculates any taxable boot, and estimates the tax consequences. It also provides a timeline for the required identification and closing deadlines.

Homebuyers, investors, and real-estate professionals all benefit from precise 1031 exchange figures when evaluating properties, negotiating deals, or planning long-term investment strategies. Save this calculator and revisit it whenever market conditions or your financial situation changes.

When This Page Helps

A 1031 exchange can defer $20,000–$200,000+ in capital gains taxes, but the rules are complex. This calculator shows your minimum reinvestment requirements, calculates any taxable boot, and maps out the critical 45/180-day deadlines.

How to Use the Inputs

1. Enter the sale price and adjusted cost basis of the property being sold.
2. Input selling costs (commissions, title, etc.).
3. Enter the expected replacement property value.
4. Input the new mortgage amount on the replacement property.
5. Set the sale closing date to see the 45-day and 180-day deadlines.
6. Review boot calculation, tax deferral, and timeline.

Example Calculation

Tips & Best Practices

• The replacement property must be of equal or greater VALUE than the property sold — not just equal equity.
• You must use the same taxpayer entity for both the sale and purchase (personal name, LLC, etc.).
• Use a Qualified Intermediary (QI) to hold funds during the exchange — touching the money disqualifies you.
• The 45-day identification deadline is strict and cannot be extended, even for weekends or holidays.
• You can identify up to 3 properties (Three-Property Rule) or any number totaling ≤200% of the sold property's value.
• Primary residences do NOT qualify for 1031 exchanges — only investment or business-use properties.

How a 1031 Exchange Works Step by Step

First, you sell the relinquished property and a Qualified Intermediary holds the proceeds (you cannot touch the money). Within 45 days, you identify replacement properties in writing. Within 180 days, you close on one or more replacement properties using the held funds. The QI transfers the proceeds directly to the closing, and you receive the replacement property with a deferred gain basis.

Boot Calculation and Tax Impact

Boot is taxed at capital gains rates (currently 15–20% federal plus state taxes). There are two types: cash boot (net proceeds not reinvested) and mortgage boot (if new debt is less than old debt). You can offset mortgage boot by adding more cash to the exchange. Proper planning can eliminate all boot for full tax deferral.

The Stepped-Up Basis Strategy

Many investors use serial 1031 exchanges throughout their lifetime, deferring all capital gains. At death, heirs receive the property with a stepped-up basis (fair market value at death), permanently eliminating all deferred gains. This “buy, exchange, die” strategy can save families hundreds of thousands in taxes.

Frequently Asked Questions

• What is a 1031 exchange?

  A 1031 exchange is a tax-deferred swap of investment properties under IRC Section 1031. Instead of paying capital gains tax when you sell, you reinvest the proceeds into a “like-kind” replacement property and defer the tax until you eventually sell without exchanging. Properties must be held for investment or business use.

• What is boot in a 1031 exchange?

  Boot is any value received in the exchange that isn't like-kind property. Cash not reinvested (cash boot) and reduced mortgage (mortgage boot) are both taxable. For example, if you had a $200,000 mortgage and only get a $150,000 new mortgage, the $50,000 difference is mortgage boot subject to capital gains tax.

• What are the 1031 exchange deadlines?

  Two critical deadlines: (1) 45-day identification period — you must identify potential replacement properties in writing within 45 calendar days of closing the sale. (2) 180-day exchange period — you must close on the replacement within 180 calendar days. Both are strict and non-extendable.

• Can I exchange into multiple properties?

  Yes. You can acquire multiple replacement properties as long as you meet the identification rules: Three-Property Rule (up to 3 properties regardless of value), 200% Rule (any number of properties with combined value ≤200% of sold property), or 95% Rule (any number if you acquire 95% of the identified value).

• Does a 1031 exchange work for personal residences?

  No. Section 1031 applies only to property held for investment or business use. Personal residences, vacation homes used primarily for personal enjoyment, and property held primarily for sale (flips) do not qualify. However, you may convert a personal residence to a rental and later exchange it after meeting holding requirements.

• What happens when I sell the replacement property?

  When you eventually sell without exchanging, all deferred gains become taxable. The basis of the replacement property is reduced by the deferred gain, increasing the future taxable gain. However, you can continue doing 1031 exchanges indefinitely. At death, heirs receive a stepped-up basis, effectively eliminating the deferred tax permanently.