Amended Return

What is an amended return?

An amended return corrects errors or reports changes to a previously filed tax return. For federal individual returns, use Form 1040-X. Businesses use amended versions of their original forms. You might amend to claim missed deductions, correct income amounts, change filing status, or respond to audit findings. Amended returns must be filed within three years of the original due date or two years of payment, whichever is later.

When to file an amended return

File when you discover errors that affect tax liability. A missed deduction of $500 might not justify the effort. A missed deduction of $50,000 certainly does. Receiving corrected documents like amended W-2s or K-1s requires evaluation. Mathematical errors are usually caught and corrected by the IRS without amendment. Substantive errors in income, deductions, or credits require formal amendment.

The amendment process

Wait until your original return is fully processed. Prepare the amended return showing original amounts, corrected amounts, and an explanation of changes. Attach supporting documentation for new deductions or credits. Amended returns are processed manually and take longer than original returns. If the amendment increases your refund, expect several months before receiving payment.