Adjusted basis

Cost basis after adjustments for capital improvements added and depreciation taken. This is the number used to figure the taxable gain when a property sells.

Investment terms · Updated September 2026

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Part 1 of 4

Why a seller cares

Your adjusted basis is what the gain on the sale is measured against: what you paid, plus improvements, minus any depreciation. For a rental it is smaller than you think, because depreciation has been taking it down every year.

Part 2 of 4

A simple example

You bought a rental for $200,000, added a $20,000 roof, and claimed $50,000 of depreciation. Your adjusted basis is $170,000.

Adjusted basis: a simple example
The pieceWhat it does to the basis
Purchase price, $200,000The starting point
The $20,000 roofAdds; basis is $220,000
$50,000 of depreciation claimedSubtracts; basis is $170,000

Adjusted basis is the cost the tax code remembers, and depreciation has been quietly lowering it.

Part 3 of 4

What people get wrong

That the basis is what you paid. It moves with every improvement and every year of depreciation.

Part 4 of 4 · where to read next

Where it appears in the sale

What a definition is, and what it isn't

Keighbor is a software company, not a law firm, brokerage, or tax adviser. This is general information, not legal, tax, financial, or real estate advice about your sale. Your situation may differ. Before acting on a contract, disclosure, title, tax, or pricing question, ask an appropriately licensed professional in your state.

Written and researched by Keighbor Research · drawn from the reference glossary · how we research and check what we publish

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