To address an envelope to the IRS, look up the correct mailing address for your specific form, your state of residence, and whether you’re enclosing a payment, then write it in standard USPS format with your return address in the upper left and no Social Security number anywhere on the outside. That sounds like a lot of variables, and it is. There is no single IRS address that works for every return.
Find the Right IRS Address for Your Return
Different IRS processing centers handle different forms and different parts of the country. A Form 1040 mailed from California with a payment goes to a P.O. Box in Louisville, Kentucky. The same form filed from California without a payment goes to Ogden, Utah.1Internal Revenue Service. Where to File Addresses for Taxpayers and Tax Professionals Filing Form 1040 or Form 1040-SR A Form 4868 extension request uses a completely different set of addresses.2Internal Revenue Service. Where to File Addresses for Businesses and Tax Professionals Filing Form 4868
The reliable way to get this right is to check the IRS “Where to File” page for the specific form you’re mailing, or use the address printed in that form’s instructions. Addresses change from year to year, so verify each time even if you mailed the same form last spring.3Internal Revenue Service. Where to File – Forms Beginning with the Number 1
Filing From Outside the United States
U.S. citizens and residents mailing from a foreign country, a U.S. territory, or an APO/FPO address use a separate set of addresses. For Form 1040 with no payment, the address is Department of the Treasury, Internal Revenue Service, Austin, TX 73301-0215, USA. With a payment, it goes to Internal Revenue Service, P.O. Box 1303, Charlotte, NC 28201-1303, USA.4Internal Revenue Service. International – Where to File Form 1040 Addresses for Taxpayers and Tax Professionals
How to Lay Out the Envelope
Once you have the correct address, the envelope itself follows the same conventions as any other piece of mail.
Put your return address in the upper left corner: your full name (both names if you’re filing jointly), street address, city, state, and ZIP code. Put the IRS address in the center. Line one is “Internal Revenue Service.” Line two is the P.O. Box or street address. Line three is the city, state, and ZIP.
USPS sorting equipment reads addresses most reliably when they’re in all uppercase with no punctuation. A typical envelope looks like this:
JANE DOE
123 MAIN ST
ANYTOWN CA 90210
INTERNAL REVENUE SERVICE
PO BOX 931000
LOUISVILLE KY 40293-1000
Never Put Your SSN on the Outside
Your Social Security number belongs on the return inside the envelope, not on the envelope itself. The Social Security Number Fraud Prevention Act restricts displaying SSNs on documents sent through the mail, and the IRS has been working to reduce unnecessary use of full SSNs.5Internal Revenue Service. What Are We Doing to Protect Taxpayer Privacy If the envelope is damaged or misrouted, you don’t want that number readable to anyone who handles it.
If You’re Enclosing a Payment
Including a payment changes the mailing address. The IRS “Where to File” tables list a separate address for returns sent with payments, and it almost always points to a different P.O. Box than the no-payment version.1Internal Revenue Service. Where to File Addresses for Taxpayers and Tax Professionals Filing Form 1040 or Form 1040-SR Check the payment column, not the no-payment column.
Inside the envelope, include Form 1040-V (the payment voucher) with your check or money order. Don’t staple or clip the payment or voucher to the return. Everything goes in loose.6Internal Revenue Service. Form 1040-V Payment Voucher for Individuals Processing centers separate payments from returns as soon as they arrive, and staples slow that down.
Make the check or money order payable to “United States Treasury.” Write your SSN, phone number, and the tax year on the payment itself so it can be matched back to your return if the two get separated.
Postage and Proof That You Mailed It
A tax return with schedules and supporting documents is heavier than an ordinary letter, and many returns qualify as large envelopes (flats) because of their size. Weigh the envelope on a scale or take it to the post office rather than guessing at the postage. Under-stamped mail comes back to you, and by the time you re-send it, the filing deadline may have passed.
Regular first-class mail is legal, but it leaves you with nothing to prove you sent the return. USPS Certified Mail gives you proof of mailing and proof of delivery; adding a Return Receipt gets you the recipient’s signature. USPS specifically recommends keeping your mailing receipt or a Certificate of Mailing when sending tax documents.7USPS. Mailing Your Tax Return Under federal law, sending a return by registered or certified mail creates strong legal evidence that it was delivered to the IRS.8Office of the Law Revision Counsel. 26 USC 7502 – Timely Mailing Treated as Timely Filing and Paying
The Postmark Is the Filing Date
Federal law treats the postmark date as the filing date if three conditions are met: the return is properly addressed to the correct IRS office, postage is prepaid in full, and it’s postmarked on or before the deadline.8Office of the Law Revision Counsel. 26 USC 7502 – Timely Mailing Treated as Timely Filing and Paying With registered or certified mail, the registration or certification date is the postmark date. All three conditions have to be satisfied, which is another reason to double-check the address and weigh the envelope.
Using FedEx, UPS, or DHL
You can also use a designated private delivery service. The IRS recognizes specific service levels from DHL Express, FedEx, and UPS for the timely-mailing rule.9Internal Revenue Service. Private Delivery Services (PDS) Not every service level qualifies. FedEx Priority Overnight is on the list; FedEx Ground is not. Confirm the service level on the IRS page before you ship.
Private carriers can’t deliver to P.O. Boxes, so the IRS publishes separate street addresses for private delivery. All returns sent this way go to one of three submission processing centers:
- Austin: 3651 S IH35, Austin, TX 78741
- Kansas City: 333 W. Pershing, Kansas City, MO 64108
- Ogden: 1973 Rulon White Blvd., Ogden, UT 84201
Which center you use depends on your form and state. The “Where to File” page for your form tells you which city handles your return, and the PDS street address page gives you the matching physical address.10Internal Revenue Service. Submission Processing Center Street Addresses for Private Delivery Service (PDS) With a private carrier, both payment and no-payment returns go to the same street address.
What Happens If You Send It to the Wrong Address
A misaddressed return doesn’t automatically trigger a penalty. The IRS generally forwards it to the correct center, so the return isn’t lost. The real cost is time. Refunds get delayed. And if you were mailing close to the deadline, forwarding may mean the return isn’t treated as filed on time at the correct office.
A simple addressing mistake typically doesn’t qualify as reasonable cause for penalty relief. The IRS evaluates each case individually, but mistakes and oversights generally aren’t enough on their own.11Internal Revenue Service. Penalty Relief for Reasonable Cause The failure-to-file penalty is 5% of the unpaid tax per month or partial month, capped at 25%, with a $525 minimum for returns due after December 31, 2025 that are more than 60 days late.12Internal Revenue Service. Failure to File Penalty Verifying the address is a minute of work against numbers like that.
Before You Seal the Envelope
- Confirmed the address on the IRS “Where to File” page for your form, state, and payment status.
- Return address in the upper left: full name (both names if joint), street, city, state, ZIP.
- If you’re paying, Form 1040-V and the check are loose, not stapled or clipped.
- Check made out to “United States Treasury” with your SSN, phone number, and tax year written on it.
- No SSN visible anywhere on the outside of the envelope.
- Envelope weighed and postage applied for its actual weight and size.
- Certified Mail, Return Receipt, or an IRS-designated private carrier used for proof of timely filing.
- Full copy of the return and every mailing receipt saved with your records.