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1031 Exchange Tax Deferral Calculator

Estimate the capital gains tax deferred by using a 1031 like-kind exchange for investment property.

Result

Estimated Tax Deferred
$50,000.00

This is deferral, not elimination - tax is postponed until the replacement property is eventually sold without another exchange (or eliminated entirely if the property passes to heirs, who receive a stepped-up basis). Requires strict timing rules: identifying a replacement property within 45 days and closing within 180 days of the original sale.

About the 1031 Exchange Calculator

The 1031 Exchange Tax Deferral Calculator estimates the capital gains and depreciation recapture tax you can postpone by exchanging one investment property for another under Internal Revenue Code Section 1031, instead of simply selling and cashing out. It is built for real estate investors and their advisors who want a quick, before-the-fact estimate of how much tax can be pushed into the future by structuring a sale as a like-kind exchange. Because the deferred amount depends entirely on the size of the gain and the tax rate that would otherwise apply, the calculator turns those two inputs into a single dollar figure showing what stays working in real estate rather than going to the IRS this year.

How It Works

You enter the sale price of the property you are giving up, your adjusted cost basis in that property, and a combined rate representing federal long-term capital gains tax plus any depreciation recapture you would owe. The calculator subtracts your basis from the sale price to isolate the taxable gain, then applies your combined rate to that gain to produce the estimated tax deferred. The output reflects tax only on the profit above what you originally paid, not on the whole sale price.

Gain = max(Sale Price - Adjusted Cost Basis, 0); Tax Deferred = Gain x (Combined Rate / 100)

Formula & Methodology

To work this out by hand, first find your adjusted cost basis: original purchase price, plus capital improvements, minus depreciation already claimed. Subtract that basis from your sale price to get the realized gain. Then estimate a combined tax rate by adding your expected long-term capital gains rate (often 15% or 20% federally) to a separate rate for unrecaptured Section 1250 depreciation recapture, capped at 25%, plus any applicable state tax. Multiplying the gain by that combined percentage gives the dollar amount deferred rather than paid in the year of sale.

Examples

Selling a Rental at Default Values

Using the calculator's defaults - a $500,000 sale price, a $300,000 adjusted cost basis, and a 25% combined rate - produces a $200,000 gain and $50,000 of tax deferred by exchanging into a replacement property instead of cashing out.

A Larger Property with Heavier Depreciation

An investor sells an apartment building for $900,000 with a $520,000 adjusted basis, lowered by years of depreciation, and estimates a 28% combined rate; the calculator shows a $380,000 gain and $106,400 in tax deferred.

Advantages

  • Turns two numbers most investors already know, sale price and basis, into a concrete deferred-tax estimate before committing to an exchange.
  • Makes the tradeoff visible: a larger deferred-tax figure signals a bigger incentive to meet the exchange's tight deadlines rather than sell outright.
  • Useful for comparing exchange candidates side by side, since basis and combined rate can be swapped quickly to model different properties.

Common Mistakes

  • Entering only a capital gains rate and forgetting to fold in depreciation recapture, which understates both the tax at stake and the deferral benefit.
  • Treating the deferred amount as tax saved permanently rather than postponed, when it becomes due if the replacement property is later sold without another exchange.
  • Overlooking that the 45-day identification and 180-day closing windows are hard deadlines with no extensions, regardless of how the numbers work out.

Edge Cases to Watch For

  • If the adjusted cost basis equals or exceeds the sale price, the calculator floors the gain at zero, so it shows no tax deferred - a loss position has nothing to defer.
  • The single rate entered does double duty for both capital gains and depreciation recapture, so leaving out recapture will understate the benefit of exchanging.
  • The result reflects deferral, not elimination - the gain carries into the replacement property's basis and becomes taxable again if that property is later sold outside another exchange.
  • The calculator does not model the strict 45-day identification and 180-day closing deadlines a real exchange must meet, or the qualified intermediary requirement for holding sale proceeds.

Common Use Cases

  • Real estate investors deciding whether the tax deferral from an exchange is large enough to justify its stricter timeline and paperwork compared to a simple sale.
  • Property owners comparing several possible relinquished properties to see which carries the largest deferred-tax benefit.
  • Tax and real estate professionals giving clients a fast, before-the-fact estimate ahead of a more detailed exchange analysis.
Written & fact-checked by the Calculateus TeamLast updated August 5, 2026How we verify our formulas

Frequently asked questions

Why is a 1031 exchange called "like-kind" if the properties can be very different types of real estate?

Despite the name, "like-kind" for real estate is interpreted very broadly by the IRS - almost any real property held for investment or business use can be exchanged for almost any other real property held for investment or business use (like swapping an apartment building for raw land or a retail strip mall), as long as both properties are real estate and both are held for qualifying purposes, not personal use.

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Conclusion

This calculator gives a straightforward starting estimate of what a 1031 exchange can defer, based on the gain in the property and the tax rate that would otherwise apply. It is meant as a planning input, not a substitute for working through the specific timing rules, intermediary requirements, and basis carryover that govern an actual exchange.

References