Mail your amended return to the IRS service center that serves your state, not the address on your original return

The mailing address for an amended return depends on where you live, not where you filed originally. The IRS operates 10 regional service centers across the country, and each one handles amended returns from specific states. Sending your Form 1040-X to the wrong address delays processing by weeks or months because the IRS has to forward it internally.

You will need Form 1040-X (Amended U.S. Individual Income Tax Return) and copies of any supporting schedules that changed from your original return. Do not mail the original return documents again — only the amended pages and the new schedules.

Key Takeaways

  • The correct mailing address is determined by your state of residence, and the IRS publishes a specific address for each state on the Form 1040-X instructions.
  • You must use Form 1040-X; mailing a corrected 1040 or a letter explaining the error will not be processed as an amendment.
  • Include only the amended Form 1040-X and the schedules that changed, along with a cover letter explaining what you are correcting.
  • Mail your amended return by certified mail with return receipt so you have proof the IRS received it.
  • Processing an amended return typically takes 8 to 12 weeks after the IRS receives it, longer than an original return.

Find your state's IRS service center address

The IRS Form 1040-X instructions include a table listing the mailing address for each state. Your state determines which service center processes your amended return. For example, California returns go to Fresno, Texas returns go to Austin, and New York returns go to Andover, Massachusetts.

You can find the current addresses in the Form 1040-X instructions PDF on IRS.gov, or call the IRS at 800-829-1040 to confirm the address for your state. Do not use the address from your original return's envelope or from a prior year's instructions — the IRS changes these addresses occasionally.

If you filed a joint return, use the address for the state where you lived when you filed. If you have moved since filing, use the address for your current state of residence.

What to include with your amended return

Your mailing package should contain Form 1040-X, a cover letter, and copies of any schedules or forms that changed. Do not include your original return, W-2s, 1099s, or other supporting documents unless the IRS specifically requested them in a notice.

The cover letter should be brief and state which tax year you are amending, what you are correcting, and why. For example: "I am amending my 2023 tax return to report additional income from Schedule C that was omitted from my original filing." Include your name, Social Security number, and the tax year on the cover letter.

If you are amending multiple years, send each year in a separate envelope to the correct service center for that year. Do not combine multiple years in one mailing.

How to mail your amended return safely

Use certified mail with return receipt requested so you have proof that the IRS received your package. Keep the receipt and the returned postcard in your records. Regular first-class mail works, but you will have no proof of delivery if the IRS later says they never received it.

Do not use a private carrier like FedEx or UPS to mail to an IRS service center address unless you have confirmed with the IRS that the service center accepts packages from that carrier. Some service centers do not accept private carrier deliveries, and your return could be rejected or delayed.

Mail your amended return at least 30 days before any important date you are trying to meet, such as a statute of limitations important date. The IRS does not consider a return filed until they receive it, not when you mail it.

What happens after you mail your amended return

The IRS will send you a notice of receipt within 4 to 6 weeks confirming they received your Form 1040-X. This notice will include a tracking number. Keep this notice in your records.

Processing the amendment itself takes 8 to 12 weeks after receipt. If you are owed a refund, the IRS will mail it to you. If you owe additional tax, they will send you a bill with instructions for payment. Do not contact the IRS before 12 weeks have passed unless you have a specific reason, such as a statute of limitations important date approaching.

When to use electronic filing instead of mailing

If you use tax software or a tax professional, they can file your amended return electronically using e-file. Electronic filing is faster — the IRS acknowledges receipt within 24 hours and processes the amendment in 4 to 6 weeks instead of 8 to 12. You do not need to print, sign, and mail anything.

Not all tax software supports amended returns, so check your software's features before purchasing. Tax professionals can file amended returns electronically for a fee, which is often worth the cost if you are correcting a complex return or need the refund quickly.

Common mistakes that delay amended returns

Sending your amended return to the wrong address is the most common delay. The address on your original return's envelope is not the address for amended returns. Check the Form 1040-X instructions for your state.

Including original supporting documents (W-2s, 1099s, receipts) when the IRS did not ask for them slows processing because the IRS has to separate them from the amended return. Send only the Form 1040-X and changed schedules unless you received a notice requesting specific documents.

Forgetting to sign and date Form 1040-X will cause the IRS to reject it and send it back to you. Sign the form in the same way you signed your original return — both spouses must sign if you filed jointly.

Frequently Asked Questions

Can I file an amended return online instead of mailing it?

Yes, if you use tax software that supports amended returns or work with a tax professional who can e-file. Electronic filing is faster and you receive confirmation within 24 hours. Not all software supports amendments, so check before you buy or contact a tax professional for pricing.

How long does it take the IRS to process an amended return?

The IRS typically takes 8 to 12 weeks to process a mailed amended return after they receive it. Electronic filing takes 4 to 6 weeks. You will receive a notice of receipt within 4 to 6 weeks confirming they got your Form 1040-X.

What if I mail my amended return to the wrong address?

The IRS will eventually forward it to the correct service center, but this adds 2 to 4 weeks to processing time. Use certified mail so you have proof of when you mailed it. If a important date is approaching, contact the IRS at 800-829-1040 to confirm they received your return and ask them to expedite it.

Do I need to mail an amended return if I already filed electronically?

No. If you filed your original return electronically, you can file your amended return electronically as well using the same software or a tax professional. You do not need to print and mail anything.

Can I amend a return that the IRS is currently auditing?

You can file an amended return, but the IRS may suspend processing it while the audit is ongoing. Contact the IRS agent handling your audit before mailing an amended return to ask whether you should wait or file now.