To mail a federal tax return, confirm the correct IRS destination for your exact form, tax year, state or location, and whether you are enclosing payment. Then send it through USPS or an IRS-approved private delivery service, and keep proof of the mailing date. There is no single IRS address that applies to every return.
1. Confirm which return you are mailing
Check the form number and tax year before addressing the envelope. A Form 1040 or 1040-SR may go to a different destination than Form 1040-X, an estimated tax payment, or another return. The IRS address lookup covers many form types and circumstances; use the live page rather than an address copied from an older return:
IRS: Where to file paper tax returns with or without a payment.
The lookup is location- and payment-sensitive. Its state table reviewed for calendar-year 2025 filings and the 2025 Form 1040 instructions for returns filed in 2026 are not interchangeable with future-year directions. Recheck the current IRS page each time you mail a return.
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2. Choose USPS or an IRS-designated private delivery service
USPS can deliver to IRS P.O. boxes. Private carriers cannot deliver to P.O. boxes, and their timely-mailing treatment applies only to service levels currently designated by the IRS—not automatically to every shipment from a named carrier. Check the IRS list before purchasing a label: IRS Publication 17 (2025) and the current IRS private delivery service street-address page.
| Consideration | USPS | IRS-designated private delivery service |
|---|---|---|
| Address | Use the IRS lookup; USPS can deliver to an IRS P.O. box. | Use the IRS street address for the applicable form and processing center; do not use a P.O. box. |
| Mailing-date evidence | The IRS describes evidence rules for registered mail and a certified-mail receipt postmarked by a postal employee. The Taxpayer Advocate Service suggests certified mail with return receipt. | Ask the carrier how to obtain written proof of the mailing date, and confirm that the exact service level is IRS-designated. |
| Main risk | Wrong destination, insufficient postage, or no useful postmark evidence. | An unapproved service level or a P.O. box destination can defeat the intended method. |
For private delivery service, the IRS lists these street destinations for the relevant processing centers: Austin, Internal Revenue Submission Processing Center, 3651 S IH35, Austin, TX 78741; Kansas City, Internal Revenue Submission Processing Center, 333 W. Pershing, Kansas City, MO 64108; and Ogden, Internal Revenue Submission Processing Center, 1973 Rulon White Blvd., Ogden, UT 84201. These are not universal addresses: select the right center using the IRS instructions for your form and circumstances.
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3. If enclosing a check or money order, recheck the address
The IRS may direct a return sent with payment to a different address than one sent without payment. Follow the payment-specific result in the IRS lookup, including any instructions for the check or money order. If the appropriate destination is a P.O. box, use USPS; if you intend to use a private carrier, verify the IRS street-address route that applies to your return.
4. Address, postage, and mail the envelope by the deadline
The IRS says a paper return is timely mailed if it is in an envelope that is properly addressed, has enough postage, and is postmarked by the due date. Publication 17 (2025) explains that standard: IRS Publication 17 (2025). A due date that falls on a weekend or legal holiday may shift, and special rules can apply to some filers, so check the instructions for your return and tax year.
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- Income Tax Return Envelopes: can decorate every tax return and report in your office, use address cover to mail large documents and tax returns easily, they are the solution to store and hide data; The way you present your work needs to match the professionalism of your company; Both the recipient address and the return address are displayed through the envelope window
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- Use the current IRS address for your form, location, and payment status.
- Confirm the package has adequate postage and is addressed legibly.
- If using a private carrier, verify the specific service level qualifies and use the matching IRS street address.
- Mail early enough to meet the applicable due date and retain the receipt or carrier record.
A filing extension does not extend the time to pay tax due. The 2025 Instructions for Form 1040 distinguish the filing deadline from payment timing.
5. Keep proof of when you mailed it
For USPS, registered mail provides evidence of its registration date. For certified mail, the IRS says a receipt postmarked by a postal employee carries the postmark date and is evidence of delivery. The Taxpayer Advocate Service recommends USPS certified mail with return receipt when you need proof of both the mailing date and when the IRS received the return: Taxpayer Advocate Service: Taxpayer Mails Return. Keep the receipt and any return receipt or delivery record with your tax documents.
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- TAX MAILER ENVELOPE: ComplyRight Income Tax Return Single Window Envelope serves as a multi-purpose tax return envelope that will dress up every tax return and report from your office. Easily mail large documents and tax returns with an address cover sheet, they are a perfect solution to quickly seal and protect data. The way you present your work needs to match your firm's professionalism every step of the way. Both the recipient address and return address show through the envelope windows
- PACKAGING: They come 50 per pack. Double window first class mailer envelopes measure 9-5/8" x 11-1/8", and open on the short side. This envelope has a peel and seal closure, as well as first class mail and diamond border imprinted in green on the envelope.
- WINDOW DIMENSIONS: The top window is 1-1/2” x 4”; 1-1/4” from left and 9” from bottom while the mid window is 1-13/16” x 5-5/8”; 2-3/8” from left and 5-1/8” from the bottom.
- COMPLYRIGHT: At ComplyRight, our mission is to free employers from the burden of tracking and complying with the complex web of federal, state, and local employment laws. ComplyRight is the market leader in government compliant products such as tax forms, tax software, HR products and services, labor law solutions, and health insurance claim forms.
For an IRS-designated private carrier service, retain the carrier’s written mailing-date proof and shipment records. A tracking page or service from the same company is not, by itself, confirmation that the service level qualifies for the IRS timely-mailing rule.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.6. Allow for paper-return processing
The Taxpayer Advocate Service estimates that a mailed Form 1040 can take six to eight weeks to process. That is an estimate, not a guarantee or a deadline that applies to every form or filing circumstance. See its mailing guidance for context.
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- TAX MAILER ENVELOPE: ComplyRight First Class Double Window Envelope serves as a multi-purpose tax return envelope that will dress up every tax return and report that leaves your office. Easily mail large documents and tax returns with an address cover sheet, they are a perfect solution to quickly seal and protect data. Both the recipient address and return address show through the envelope windows.
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Federal and state returns use different destinations
This guidance is for individual federal paper returns. State tax returns go to the relevant state tax agency and have separate addresses and rules. For business returns, amended returns, nonresident filings, territories, foreign addresses, or other unusual situations, follow the IRS instructions for the exact form rather than assuming the Form 1040 address applies.
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