If you discover an error after filing your return, you may need to amend your return. The IRS may correct errors in math on a return and may accept returns without certain forms or schedules. In these instances, there is no need to amend your return! However, do file an amended return if there is a change in your filing status, income, deductions, or credits.
Generally, to claim a refund, you must 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. Returns filed before the due date (without regard to extensions) are considered filed on the due date.
File a separate Form 1040X for each tax year you are amending. Mail each form in a separate envelope. Be sure to enter the year of the return you are amending at the top of Form 1040X. The form has three columns.
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