Always use a secure method, such as certified mail, return receipt requested, when you're sending returns and other documents to the IRS. It will provide confirmation that the IRS has actually received your documents or payment.

Can I send a certified letter to IRS?

The IRS relies on the U.S. Postal Service to deliver mail to millions of Americans. ... If problems aren't addressed, the IRS will resort to sending certified letters. IRS certified mail has these specific characteristics: Mailing receipt: Certified mail comes with a mailing receipt for the sender, in this case, the IRS.

Where do I send my IRS certified mail?

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.