The amended Federal income tax return (1040X) is part of the 1040 form series. The purpose of form 1040X is to correct an error made on the already filed Federal tax return.
You may need to file an amended return if there is a change in your filing status, income, deductions, credits, or tax liability.
Info: Sprintax can prepare an amended Federal income tax return for you, in case you need to correct your originally filed Federal tax return.