If you didn't claim the correct filing status or you need to change your income, deductions, or credits, you should file an amended or corrected return using Form 1040-X, Amended U.S. Individual Income Tax Return.
If you are paper-filing the amended to the IRS... send the 1040x, the amended forms with a watermark ``As Amended''. Original forms with a watermark ``As Originally Filed''. You can write on the form, it doesn't have to be a ``watermark''. One big staple, with 1040x on top, next the amended, last as originally filed.
Sample Letter to the IRS Dear Sir/Madam, I am writing to request a correction to my tax return. My social security number is 123-45-6789, and I filed my tax return for the 2020 tax year. I received a notice from the IRS stating that I owe additional taxes due to an error in my return.
File an amended return using Form 1040-X, Amended U.S. Individual Income Tax Return as soon as possible.
Mailing Addresses AreaAddress IL-1040-X, Amended Illinois Individual Income Tax Return ILLINOIS DEPARTMENT OF REVENUE PO BOX 19047 SPRINGFIELD IL 62794-90476 more rows
See TC 976-977 for amended return.
On Form 1040-X, enter your income, deductions, and credits from your return as originally filed or as previously adjusted by either you or the IRS, the changes you are making, and the corrected amounts. Then, figure the tax on the corrected amount of taxable income and the amount you owe or your refund.