1031 Exchange Calculator: How to Calculate Tax Deferral (2026)

Updated July 2026
12 min read
By ArvCalc Editorial

Picture this: you bought a rental duplex in Phoenix eight years ago for $300,000. Today you have a buyer offering $450,000. After closing costs, your net gain is north of $140,000 — and the IRS wants a chunk of it. Between federal capital gains tax at 15–20%, depreciation recapture at 25%, and state tax that can add another 3–13%, you could hand over $40,000–$60,000 before you even touch the next deal.

A 1031 exchange calculator lets you model exactly how much of that bill disappears when you reinvest the proceeds into a like-kind replacement property instead of pocketing the cash. This guide walks through the rules, the math, two detailed worked examples, every deadline you need to hit, and the mistakes that blow up otherwise solid deals.

What Is a 1031 Exchange — and What Does the Calculator Actually Measure?

Section 1031 of the Internal Revenue Code lets real estate investors defer capital gains taxes when they sell a property and reinvest the proceeds into a “like-kind” replacement. The tax does not go away permanently — it rolls forward into the basis of the new property — but deferral keeps your full equity working in the next deal rather than shrinking by 20–40% on the way out.

A 1031 exchange calculator measures three things simultaneously:

• Realized gain — the difference between your net sale price and your adjusted basis (original cost minus accumulated depreciation)
• Recognized gain — the portion of that gain you must pay tax on right now, usually because you received cash out (called “boot”)
• Deferred gain — the portion successfully rolled over, which becomes the carry-forward basis of the replacement property

For a complete primer on the mechanics, see our full 1031 exchange real estate guide. For the strict IRS rules that govern what qualifies, the primary authority is IRS Publication 544: Sales and Other Dispositions of Assets and the IRS like-kind exchange guidance.

Realized Gain vs. Recognized Gain: The Core Calculation

Before you can use a 1031 exchange calculator, you need two foundation numbers.

Step 1 — Calculate Adjusted Basis

Your adjusted basis starts with what you paid, then shifts over time:

Use our depreciation calculator to get your annual deduction figure if you are not sure how much basis you have already used up. This matters because the IRS taxes depreciation recapture at a flat 25%, separate from the long-term capital gains rate.

Step 2 — Calculate Realized Gain

That $180,220 breaks into two tax “buckets”: $72,720 of depreciation recapture (taxed at 25%) and $107,500 of long-term capital gain (taxed at 15% or 20% federally, depending on your income).

1031 Exchange Calculator: Worked Example 1 — Full Deferral

Maria sells her Phoenix duplex for $450,000 (net proceeds after costs: $427,500) and uses a qualified intermediary to buy a replacement property in Scottsdale for $500,000. She does not pocket any cash.

Tax Saved in Example 1

Maria defers $42,415 in tax by doing the exchange. That capital stays fully deployed into the $500,000 replacement property, compounding rather than evaporating.

The replacement property’s starting basis is $500,000 minus the $180,220 deferred gain, leaving Maria with a carryover basis of $319,780. If she sells later without another exchange, that deferred gain surfaces at that point — but by then, she may have stepped up the property’s value considerably.

1031 Exchange Calculator: Worked Example 2 — Partial Deferral with Boot

James sells the same duplex but buys a smaller replacement property for $400,000, keeping the $27,500 difference in cash. That $27,500 in cash plus any mortgage relief he received is “boot” — and it triggers a partial tax bill immediately.

Boot Calculation

Mortgage relief counts as boot because James is walking away from less debt than he carried before. For a full breakdown of every item that triggers boot, see our dedicated 1031 exchange boot guide.

Recognized (Taxable) Gain

Recognized gain equals the lesser of (a) total boot received or (b) total realized gain.

Tax Owed on Boot

Note that the IRS applies boot first to depreciation recapture, then to capital gains. Because the $52,500 boot is less than the $72,720 depreciation recapture, James’s entire taxable gain falls into the 25% recapture bucket — he owes nothing at the capital gains rate yet.

Boot Calculator: What Counts as Boot and How to Avoid It

Boot is any value you receive that is not “like-kind” real property. It collapses your deferral dollar-for-dollar, up to the limit of your realized gain. There are two types:

Cash Boot

• Cash or near-cash items you receive at closing
• Closing costs paid from exchange proceeds that are not “exchange expenses” (e.g., property inspections, prorated rent, security deposits)
• Personal property received (appliances, vehicles, equipment transferred separately)

Mortgage Boot (Debt Relief)

• If the old mortgage was $200,000 and the new mortgage is $150,000, the $50,000 difference is mortgage boot
• You can offset mortgage boot with cash — pay an extra $50,000 into the replacement to neutralize it
• You cannot offset cash boot with mortgage boot — they run in one direction only

Boot Avoidance Checklist

• Replacement property purchase price equal to or greater than net sale price
• New debt equal to or greater than old debt (or make up the difference in cash)
• All proceeds flow through the qualified intermediary — never touch them yourself
• Pay allowable exchange expenses from exchange funds only
• Avoid receiving personal property in the deal (negotiate separate transfer outside the exchange if needed)

1031 Exchange Timeline: The Deadlines That Can Kill Your Deal

The IRS gives you a strict two-step deadline. Miss either one and the exchange fails — full stop. See our dedicated 1031 exchange timeline and deadlines guide for how to build a compliant calendar.

Example Timeline: Sale Closes August 1, 2026

5 Common 1031 Exchange Mistakes That Cost Investors Thousands

• 1

  Missing the 45-Day Identification Window

  This is the most common failure point. Investors close the sale, then spend weeks searching for properties before realizing the 45-day clock started the day they closed — not the day they started looking. Prepare your short-list of replacement candidates before you list the relinquished property. Forty-five days sounds like a lot until escrow delays, inspection issues, and holiday weekends eat into it.

• 2

  Accidentally Triggering Boot

  Paying for repairs, inspections, or prorated HOA dues from exchange funds creates boot if those costs are not “exchange expenses.” Similarly, buying a replacement for less than the relinquished net sale price creates cash boot equal to the difference. Run the boot calculation before you go under contract, not after.

• 3

  Related-Party Transactions

  Buying a replacement property from a family member (spouse, parent, sibling, or entity you control) requires a 2-year holding period for both parties after the exchange. If either party sells within 2 years, the exchange is disallowed retroactively. The IRS watches related-party exchanges closely — document your arm’s-length rationale carefully if the situation arises.

• 4

  Converting to Personal Use Too Quickly

  A replacement property must be held for productive use in a trade or business or for investment. Moving into it or converting it to a vacation home too quickly can disqualify the exchange. The IRS Rev. Proc. 2008-16 safe harbor requires 24 months of qualified use before any personal-use conversion, with personal use capped at 14 days or 10% of rental days per year.

• 5

  Forgetting Depreciation Recapture on the Carry-Forward Basis

  When you eventually sell the replacement property without another exchange, the IRS collects both the current gain and the previously deferred depreciation recapture. Investors who plan to hold forever sometimes forget this liability sitting in their basis. Use our depreciation calculator to track cumulative recapture exposure across properties so you are never surprised.

Capital Gains Tax Rates in 2026: Why Deferral Matters More Than Ever

Understanding the tax rates your calculator is working against puts the savings in context. For 2026, federal long-term capital gains rates are:

On top of federal rates, high earners may owe the 3.8% Net Investment Income Tax (NIIT) on gains, and state tax varies widely — from 0% in Texas and Florida to over 13% in California. Our capital gains tax calculator lets you model the combined federal + state + NIIT liability before you decide whether to exchange or simply sell. See also our capital gains tax calculator guide for a walkthrough of all the inputs.

Depreciation recapture runs at a separate flat 25% federal rate regardless of your income bracket, plus applicable state tax. This is often the largest single tax item for long-term holders, because rental properties accumulate depreciation steadily — approximately 3.636% of the building value per year over 27.5 years. For a property with a $250,000 building value, that is $9,090 per year compounding into recapture exposure.

If you are exploring ways to reduce your overall tax exposure beyond the 1031 exchange, our article on how to avoid capital gains tax on real estate covers opportunity zones, installment sales, charitable remainder trusts, and stepped-up basis strategies.

What Property Qualifies for a 1031 Exchange?

The IRS definition of “like-kind” for real property is broad — almost any real estate used for investment or business qualifies:

• Residential rentals (single-family, duplexes, apartments)
• Commercial properties (office, retail, industrial, storage)
• Raw land held for investment
• Triple-net leased properties
• Tenant-in-common (TIC) interests
• Delaware Statutory Trust (DST) interests

What does not qualify:

• Primary residence or personal vacation home (unless you meet mixed-use carve-out rules)
• Property held primarily for sale (fix-and-flip inventory, dealer property)
• Stocks, bonds, partnership interests, or other securities
• Foreign real estate exchanged for U.S. real estate (must be like-kind in the same country)

According to the National Association of Realtors, 1031 exchanges account for a meaningful share of commercial real estate transactions annually — investors cite tax deferral as the primary reason they reinvest rather than cash out. The Tax Foundation’s analysis of like-kind exchange rules estimates that eliminating Section 1031 would significantly reduce real estate investment and property maintenance nationwide.

How to Use the ArvCalc 1031 Exchange Calculator

Our 1031 exchange calculator walks through four input sections:

1. Relinquished property details — sale price, selling costs, original purchase price, capital improvements, accumulated depreciation. If you need the depreciation figure, use the depreciation calculator first.
2. Replacement property details — purchase price, buying costs, new debt. This lets the calculator determine boot automatically.
3. Tax profile — filing status, total household income, state of sale. These inputs determine which capital gains rate applies.
4. Results — the calculator shows realized gain, recognized gain, deferred gain, depreciation recapture amount, total tax without exchange, tax with exchange (if any boot), and dollars saved.

Run the calculator at the beginning of your deal analysis, not at the end. Knowing the tax exposure upfront shapes how aggressively you need to replace — sometimes a partial exchange with modest boot is actually smarter than overpaying for a replacement just to avoid a small recapture bill.

For a broader picture of your investment returns, pair the 1031 analysis with our rental property calculator to project cash-on-cash return, cap rate, and annual cash flow on the replacement. The real estate ROI calculator guide explains how to read those outputs in the context of an exchange — especially when your carry-forward basis changes future depreciation on the replacement.

Frequently Asked Questions

• 
  Can I do a 1031 exchange on my primary residence?
  +
  

  No — Section 1031 applies only to property held for investment or productive use in a trade or business. Your primary home qualifies for a different exclusion: up to $250,000 (single) or $500,000 (married filing jointly) of gain is excluded under IRC Section 121 if you lived there 2 of the past 5 years. If you have a rental portion of a mixed-use property, a partial exchange may be possible for the rental fraction — consult a tax advisor for split-use situations.

• 
  How many replacement properties can I identify?
  +
  

  Under the standard 3-property rule, you can identify up to three replacement properties regardless of their combined value. Under the 200% rule, you can identify any number of properties as long as their combined fair market value does not exceed 200% of the relinquished property’s value. Under the 95% rule, you can identify any number of properties of any value, but you must close on at least 95% of the total identified value — a very high bar that trips up most investors who try it.

• 
  What happens to the deferred gain if I die before selling the replacement?
  +
  

  This is one of the most powerful estate planning aspects of the 1031 exchange. When the property passes to your heirs at death, it receives a stepped-up basis equal to fair market value at the date of death. The accumulated deferred gain — including all the depreciation recapture — permanently disappears. Heirs inherit the property with a clean slate and owe no tax on the gain you built up. This makes long-term hold-and-exchange strategies particularly effective for estate planning.

• 
  Do I need a qualified intermediary (QI)?
  +
  

  Yes, in virtually all cases. A qualified intermediary holds the exchange proceeds between the sale and the replacement purchase, preventing you from having “actual or constructive receipt” of the funds. If you receive the money — even briefly — the exchange fails and the full gain becomes taxable in the year of sale. Your attorney, accountant, or real estate agent generally cannot serve as QI due to the “disqualified person” rules. Always use an independent, established QI with errors-and-omissions coverage and segregated client accounts.

• 
  Can I exchange into multiple replacement properties?
  +
  

  Yes. You can buy more than one replacement property as long as each property was on your identified list and you close on all of them within the 180-day window. This is common when investors use exchange proceeds to diversify from one large property into several smaller ones. Each replacement property gets its own portion of the carry-forward basis, allocated in proportion to the price paid for each.

• 
  Is boot always bad? Should I always try to avoid it?
  +
  

  Not necessarily. Sometimes taking boot makes financial sense — if the only available replacement properties are overpriced, overpaying by $80,000 to avoid a $20,000 tax bill is a poor trade. The question is whether the after-tax cash from boot is more valuable than the equity locked into an inferior replacement. Run both scenarios through the calculator: full exchange vs. partial exchange with boot. The answer depends on your income tax rate, the replacement’s expected returns, and your alternative investment options.

• 
  What is a reverse 1031 exchange and can I calculate it the same way?
  +
  

  A reverse exchange lets you acquire the replacement property first, before selling the relinquished property. An Exchange Accommodation Titleholder (EAT) takes title to the parked property while you line up the sale. The same 45-day identification and 180-day closing rules apply, running from the date the EAT takes title. The tax math is identical — realized gain, boot, deferred gain all calculate the same way. The difference is complexity and cost: reverse exchanges typically cost $10,000–$20,000 more in fees than forward exchanges.

Related Calculators and Guides

Further Reading

• Complete 1031 Exchange Guide for Real Estate Investors
• 1031 Exchange Timeline and Deadlines — How to Build a Compliant Calendar
• 1031 Exchange Boot: What It Is and How to Avoid It
• Capital Gains Tax Calculator Guide
• How to Avoid Capital Gains Tax on Real Estate
• Real Estate ROI Calculator Guide

Sources and Further Reading

• IRS Publication 544 — Sales and Other Dispositions of Assets
• IRS.gov — Like-Kind Exchanges: Real Estate Tax Tips
• National Association of Realtors — Research & Statistics
• Tax Foundation — Economic Analysis of Like-Kind Exchange Rules