Amended tax returns must be paper filed using Form 1040X Tax returns must be amended within 3 years of their original filing. If you are amending more than one year, you should file separate Form 1040x forms for each year. Tax returns should be amended to correct errors such as a change in filing status or to correct income, deductions, or credits. Tax returns shouldn’t be amended for math errors or missing forms. The IRS will automatically correct math errors. The IRS will mail a request for information if needed. If you are due an additional refund, you should wait to
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