Tax Guide Form 1040x: What if You’ve Made a Mistake on Your Tax Form? This post was updated in April 2018 Form 1040x: Amended U.S. Individual Income Tax Return With all the tax filing that you have to do by a particular due ... Tax Guide Form 1040X: A Second Chance to Get Your Return Right IRS Form 1040X – the Amended U.S. Individual Income Tax Return PDFfiller focuses on one more form related to the individual tax return, Form 1040x, which lets you amend ... Tax Guide Other Types of IRS Form 1040 As we discussed in last week’s post, Form 1040 is the IRS form that most Americans will use to file their tax returns this year. Beyond the most common versions, ...