Sometimes notes are buried in miscellaneous tabs, and filed by date, making them difficult to find.

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Do file form 1040X within 3 years after the date you filed your original return or within 2 years after the date you paid the tax, whichever is later.

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When to file Generally, to claim a refund, you must file Form 1040X within three years from the date you filed your original tax return or within two years from the date you paid the tax, whichever is later.

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