Audited 05 Aug 2026·Last updated 08 Aug 2026·3 citations·Tier 2·0 uses

Step Up In Basis Calculator

Step Up In Basis Calculator: compare inherited-property gain using date-of-death value with gain using the decedent's old basis.

Step Up In Basis Calculator

Taxable gain after basis adjustment
10,000.00
Taxable gain after basis adjustment under the page's named tax convention.
Basis adjustment from decedent basis to valuation-date FMV
500,000.00
Comparison gain using decedent basis
510,000.00

Background.

Use Step Up In Basis Calculator when you need to compare inherited-property gain using date-of-death value with gain using the decedent's old basis. Inherited property generally receives a basis tied to fair market value at death or an authorized alternate valuation date. Here the arithmetic follows “later gain = max(net sale proceeds − applicable valuation-date basis, 0); basis adjustment compares that basis with decedent's basis,” rather than silently mixing alternatives.

The editable entries are fair market value at applicable valuation date, decedent's adjusted basis, later sale price, selling costs on later sale. Use values from the document or measurement that governs this step up in basis question; the defaults are only the worked fixture below. The most consequential input mistake would be to ignore that community-property rules, income in respect of a decedent, alternate valuation elections and appraisal disputes can change the basis.

IRS Publication 544, Sales and Other Dispositions of Assets; section 1250 gain and depreciation recapture documents the convention or governing rule used here. The step up in basis output is a transparent scenario under those facts: it does not manufacture an unentered market price, professional determination, carrier quote, legal eligibility finding or locally adopted code value.

What is step up in basis calculator?

Step Up In Basis is the relationship behind this decision: inherited property generally receives a basis tied to fair market value at death or an authorized alternate valuation date. On this page it means later gain = max(net sale proceeds − applicable valuation-date basis, 0); basis adjustment compares that basis with decedent's basis. Community-property rules, income in respect of a decedent, alternate valuation elections and appraisal disputes can change the basis; that is the line between the reported quantity and a broader tax analysis.

How to use this calculator.

  1. Confirm that “later gain = max(net sale proceeds − applicable valuation-date basis, 0); basis adjustment compares that basis with decedent's basis” matches the step up in basis convention you need.
  2. Replace the fixture values for fair market value at applicable valuation date, decedent's adjusted basis, later sale price, selling costs on later sale with dated values from the governing record.
  3. Keep all currencies, measurement units and time periods on the same basis before calculating.
  4. Read taxable gain after basis adjustment together with this boundary: Community-property rules, income in respect of a decedent, alternate valuation elections and appraisal disputes can change the basis.

The formula.

later gain = max(net sale proceeds − applicable valuation-date basis, 0); basis adjustment compares that basis with decedent's basis
dateOfDeathFairMarketValue · Fair market value at applicable valuation datedecedentAdjustedBasis · Decedent's adjusted basispostValuationSalePrice · Later sale pricesellingCosts · Selling costs on later sale

The calculation uses later gain = max(net sale proceeds − applicable valuation-date basis, 0); basis adjustment compares that basis with decedent's basis. In this step up in basis model, the entered terms are fair market value at applicable valuation date, decedent's adjusted basis, later sale price, selling costs on later sale. Inherited property generally receives a basis tied to fair market value at death or an authorized alternate valuation date, which is why the relationship is presented under this name rather than as a universal alternative. Community-property rules, income in respect of a decedent, alternate valuation elections and appraisal disputes can change the basis. Calculations keep full decimal precision through the relationship and round only the returned display values.

A worked example.

Example

Start with Fair market value at applicable valuation date = 750,000; Decedent's adjusted basis = 250,000; Later sale price = 800,000; Selling costs on later sale = 40,000. Following “later gain = max(net sale proceeds − applicable valuation-date basis, 0); basis adjustment compares that basis with decedent's basis” gives Taxable gain after basis adjustment = 10,000; Basis adjustment from decedent basis to valuation-date FMV = 500,000; Comparison gain using decedent basis = 510,000. The taxable gain after basis adjustment of 10,000 is therefore traceable to the visible entries rather than a hidden default. A hand check should perform the named operations in their printed order and keep intermediate values unrounded. Community-property rules, income in respect of a decedent, alternate valuation elections and appraisal disputes can change the basis.

decedent Adjusted Basis250,000
post Valuation Sale Price800,000
selling Costs40,000
date Of Death Fair Market Value750,000

Frequently asked questions.

What exactly does the taxable gain after basis adjustment represent?
For Step Up In Basis, it represents the result of later gain = max(net sale proceeds − applicable valuation-date basis, 0); basis adjustment compares that basis with decedent's basis under the entered facts. Inherited property generally receives a basis tied to fair market value at death or an authorized alternate valuation date; the 10,000 fixture should be read on that basis.
Which step up in basis convention does this page choose?
It chooses “later gain = max(net sale proceeds − applicable valuation-date basis, 0); basis adjustment compares that basis with decedent's basis.” That step up in basis variant is supported by IRS Publication 544, Sales and Other Dispositions of Assets; section 1250 gain and depreciation recapture; a governing contract, policy, tax year or locally adopted rule that specifies another treatment must take priority.
What is the easiest way to get this step up in basis result wrong?
Community-property rules, income in respect of a decedent, alternate valuation elections and appraisal disputes can change the basis. Check that step up in basis issue before interpreting the output or comparing it with another model.
Can the worked step up in basis example be checked without this site?
Yes. Use Fair market value at applicable valuation date = 750,000; Decedent's adjusted basis = 250,000; Later sale price = 800,000; Selling costs on later sale = 40,000, follow later gain = max(net sale proceeds − applicable valuation-date basis, 0); basis adjustment compares that basis with decedent's basis, and compare your final figures with Taxable gain after basis adjustment = 10,000; Basis adjustment from decedent basis to valuation-date FMV = 500,000; Comparison gain using decedent basis = 510,000. Keep the step up in basis intermediates unrounded so formatting does not create a false difference.

References& sources.

  1. [1]IRS Publication 544, Sales and Other Dispositions of Assets; section 1250 gain and depreciation recapture. Retrieved 2026-08-07. access: open unless marked otherwise.
  2. [2]U.S. Internal Revenue Service. Publication 551, Basis of Assets. Retrieved 2026-08-07. independence: primary; access: open.
  3. [3]U.S. Internal Revenue Service. Topic no. 703, Basis of assets. Retrieved 2026-08-07. independence: primary; access: open.

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later gain = max(net sale proceeds − applicable valuation-date basis, 0); basis adjustment compares that basis with decedent's basis
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