Adjusted Basis

The proportionate value of an asset or security that reflects any deductions taken on, or capital improvements to the asset or security.

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Adjusted basis is used to compute the gain or loss on the sale of an asset or a security.

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Base price from which to judge capital gains or losses upon sale of an asset like a stock or bond. The cost of commissions in effect is deducted at the time of sale when net proceeds are used for tax purposes. The price must be adjusted to account for any stock splits that have occurred since the initial purchase before arriving at the adjusted basis.