What Do I Mail With Form 8453?

When you e-file your federal return but still need to send supporting documents, Form 8453 acts as your paper trail. It tells the IRS exactly why physical copies are arriving after your digital filing. Without it, the IRS can’t link those mailed documents to your electronic return.

What’s the deal with Form 8453?

You’ve just filed your federal return electronically, but the IRS wants to see the actual transaction details—usually from Forms 1099-B, 1099-S, or similar paperwork. Instead of mailing your entire return, the IRS asks for Form 8453 to bridge the gap between your digital filing and the physical evidence. That way, the IRS can process both your return and the supporting documents without a hitch.

According to the IRS, Form 8453 is specifically for sending required paper documents when an e-filed return includes transactions that need documentation—like capital gains or losses on Form 8949.

How do I actually use Form 8453?

1. Round up your paperwork. Grab all your brokerage statements, 1099-Bs, 1099-Ss, and any Forms 8949. Double-check that each statement matches what’s in your tax software—no mismatches allowed.
2. Fill out Form 8453. You can complete it through your tax software or by hand. Just check the boxes for the forms you’re mailing (like Form 8949 or 1099-B schedules). Skip Forms W-2, W-2G, or 1099-R here—they follow different rules.
3. Sign your name. A handwritten signature is mandatory. Even if your return was e-filed, digital signatures won’t cut it for Form 8453 itself.
4. Find the right mailing address. Where you send it depends on your state. As of 2026, use these addresses:
   • Florida, Louisiana, Mississippi, Texas: Internal Revenue Service, P.O. Box 1214, Charlotte, NC 28201-1214
   • Alaska, Arizona, California, Colorado, Hawaii, Idaho, New Mexico, Nevada, Oregon, Utah, Washington, Wyoming: Internal Revenue Service, P.O. Box 7704, San Francisco, CA 94120-7704

   All other states? Check your tax software or Form 1040 instructions for the general IRS filing address.

5. Seal and ship it. Toss Form 8453 and all required paper documents into one envelope. Certified mail with tracking is the way to go. The IRS suggests mailing within 48 hours of your return being accepted to dodge processing delays.

What if my Form 8453 mailing disappears?

If your mailing hasn’t shown up after 10 business days, here’s what to do:

• Double-check the address. Pull up the P.O. box on the IRS website or your tax software’s mailing instructions. Addresses can change every year, so don’t assume it’s the same.
• Send it again—this time with proof. Switch to a different carrier (UPS or FedEx work) or use certified mail with a return receipt. You’ll get solid proof that the IRS got it.
• Give the IRS a ring. Call 1-800-829-1040 and have your EIN, SSN, and return confirmation number ready. They can check if your package landed in their system.

How can I avoid Form 8453 headaches next year?

Want to dodge delays next filing season? Try these tricks:

• Review your tax software ASAP. Some programs automatically flag certain forms for Form 8453. Check your “Transmit to IRS” checklist before you finalize your return.
• Get those PDFs in January. If your brokerage offers it, download 1099-Bs and 1099-Ss early. Stash them in a dedicated tax folder so you’re not scrambling later.
• Try IRS Free File if you qualify. Filing through IRS Free File often handles Form 8453 for you—one less thing to worry about.
• Update your address now. Moved recently? File Form 8822 to make sure IRS mailings (including Form 8453) reach you.

Think of Form 8453 as a routing slip, not a return. It keeps your e-filing fast while making sure the IRS gets the paperwork it needs. Mail it fast, track it, and keep a copy with your tax records for at least 3 years.