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IRS Basis Reconstruction

The Internal Revenue Service's rules and guidelines for reconstructing basis in property, including what records are acceptable and how to estimate basis when original records are missing.

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Jan 26, 2026
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What documentation does the IRS accept to substantiate reconstructed cost basis for lost receipts?

’s starting rule is simple: basis is generally the cost to the taxpayer and should be supported by records, but when original receipts are lost the agency accepts reconstructed documentation drawn fro...