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IRS.gov Website
Instructions for Form 1040
taxmap/instr/i1040gi-034.htm#en_us_publink24811vd0e97655

Amended Return(p90)

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.
Use the Where's My Amended Return application on IRS.gov to track the status of your amended return. It can take up to 3 weeks from the date you mailed it to show up in our system.