1040X: Filing an Amended Tax Return Using IRS Form 1040X
You should file an amended tax return if you need to correct your filing status, total income, tax deductions, or tax credits. You should not file an amended return if you are only correcting math errors. Tips for preparing an amendment.
Amended Returns – IRS Tax Topic 308
Brief overview of how and why to file an amended tax return using Form 1040X.
Instructions for Form 1040X
IRS instructions for preparing Form 1040X to amend a tax return.
Instructions for Form 1040X (PDF format)
IRS instructions for preparing Form 1040X, amended tax return. Requires Adobe Acrobat Reader.