A corrected return filed after the original, on Form 1040-X for individuals. Used to fix errors, claim a missed credit, or report income left off the original.
An amended return replaces what the IRS has on file for that year. It is how you claim a refund you missed, correct a basis error on a crypto sale, or report income that was left off before the IRS notices the mismatch. Amending to add income is generally treated more favorably than waiting for a notice.
The IRS quotes up to 16 weeks and often takes longer. Refunds from amended returns are not fast; file as soon as the error is found.
Last reviewed September 10, 2026. Tax rules change; confirm current law before acting.
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