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IRS.gov Website
Instructions for Form 1040
taxmap/instr/i1040gi-029.htm#TXMP519346fe

Amended Return(p88)

rule
File Form 1040X to change a return you already filed. Generally, Form 1040X must be filed within 3 years after the date the original return was filed or within 2 years after the date the tax was paid, whichever is later. But you may have more time to file Form 1040X if you live in a federally declared disaster area or you are physically or mentally unable to manage your financial affairs. See Pub. 556 for details.