If your amended return can't be e-filed, you'll need to print, sign, and mail Form 1040-X to the IRS.
Looking for what happens after your return is received, processing times, or how to check your status? See How to Amend a Tax Return: When, Why, and What Happens Next.
What Do I Need to Mail With Form 1040-X?
- Form 1040-X
- Any new or corrected federal forms and schedules related to the amendment
- Supporting tax documents that explain or verify your changes (only include what's needed)
Examples: Form W-2, Form 1099, Schedule K-1, credit-related forms and schedules, or other schedules affected by the amendment.
Do I Need to Sign Form 1040-X?
Yes. Paper amended returns must be signed before mailing — if you're Married Filing Jointly, both spouses must sign. Unsigned returns can be delayed or returned by the IRS.
(If you're e-filing instead, your PIN or AGI serves as your signature.)
Where Do I Mail Form 1040-X?
The correct address depends on:
- Your state of residence
- Whether you're including a payment
- The tax year you're amending
Because IRS mailing addresses can change, always confirm using the current Form 1040-X instructions or IRS guidance.
Tips Before You Mail
- Double-check that all changes are complete and accurate
- Confirm the Original Return Information is entered correctly in the program (include any refund received or payment made after the original return was processed)
- Attach all required forms and schedules
- Sign where required
- Keep copies of everything for your records
- Consider a mailing method with delivery confirmation for peace of mind