How do you fill out a form 1040x?

To fill out Form 1040X, first obtain the form from the IRS website. Start by entering your personal information at the top, including your name, address, and Social Security number. Then, indicate the tax year you are amending and complete the sections to show the original amounts, the changes, and the corrected amounts. Finally, provide an explanation for the changes made and sign the form before submitting it to the IRS.