You usually have three years from the date you filed your original tax return to file Form 1040X to claim a refund. You can file it within two years from the date you paid the tax, if that date is later.
Please read this IRS document for more information.
The amendment forms (form 1040X) are now available on both TurboTax Online and TurboTax Desktop.
Please see this TurboTax FAQ for instructions on how to amend your tax return in TurboTax.
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