what is form 1040 x amended u s individual income tax return 
the 1040 x amended u s individual u s income tax return is a form used by taxpayers who need to correct an error in a previously filed federal tax return common mistakes corrected with this form include errors in the taxpayer s filing status or number of dependents or omissions of credits or deductions form 1040 x should not be used to correct simple mathematical errors in a tax return as the internal revenue service irs routinely corrects such mistakes while processing returns who can file form 1040 x a 1040 x form should be filed by anyone who has already filed a tax return and needs to amend it for any of the following reasons 1all pages of form 1040 x can be found on the irs webpage 