If the errors are in the arithmetic, the service center will usually correct them. If forms or schedules were left out, the service center will request additional information from you and you do not need to file an amended return.

But if you find that you did not report some income, you claimed deductions or credits you should not have claimed, you failed to claim some deductions or credits you are entitled to, or you should have used a different filing status, you should file an amended return.

Please note that amended tax returns Form 1040X can not be efiled.

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