For residents of Oklahoma preparing their state tax returns, especially those choosing to mail in paper forms rather than file electronically, there’s a small but impactful question that causes confusion each year: Where exactly should you send that envelope?
Why the address matters more than you think
Filing taxes by mail isn’t as common as it once was, but it remains a crucial option for many. While online filing systems are promoted by both state and federal governments, thousands of Oklahomans still print and send their tax paperwork by post—particularly older residents and those living in areas with slow internet access.
Yet the simplicity of putting a stamp on an envelope hides a deeper complexity. Not all Oklahoma tax documents go to the same place, and sending them to the wrong PO box could delay your refund or create confusing IRS or OTC notifications.
Where to mail your Oklahoma income tax return
If you’re mailing your individual income tax return—using forms such as the standard Form 511 or the Form 511-NR for non-residents—the Oklahoma Tax Commission (OTC) states that all paper forms should be sent to:
- Oklahoma Tax Commission
- PO Box 26800
- Oklahoma City, OK 73126-0800
This applies whether you are sending the traditional format or the 2D barcode form. According to documents released by the OTC (official PDF), this box handles all individual income tax mailings.
Don’t mix federal returns into the state envelope
One recurring mistake? Some filers mistakenly include their federal return or send it to the same address. For Oklahoma residents filing their federal IRS Form 1040, the mailing address is entirely different:
| Return type | Mailing address |
|---|---|
| Federal return with no payment | Department of the Treasury, Internal Revenue Service, Austin, TX 73301-0002 |
| Federal return with payment | Internal Revenue Service, P.O. Box 931000, Louisville, KY 40293-1000 |
Combining state and federal forms in a single envelope, or using the wrong federal address, is a known source of tax-season mishaps, according to official IRS instructions (irs.gov).
Voices from the filing line
“I was ready to mail everything off when I noticed I had listed the IRS Austin address for both returns,” said Carol Jenkins, 62, of Norman. “That mistake would’ve caused a mess. I wish it was clearer—‘Where should you mail your Oklahoma tax return?’ sounds simple, but it’s really not.”
Other mailing addresses you might need
Depending on your tax activity or filing frequency, different reports go to different PO boxes. Some of these include:
- Monthly or quarterly withholding returns: PO Box 26860, Oklahoma City, OK 73126-0860
- General correspondence or administrative forms: Oklahoma Tax Commission, Oklahoma City, OK 73194
Additionally, if you’re e-filing but need to mail supplemental documentation, the OTC advises mailing them with a completed Form 511EF to the same PO Box 26800 (Tax Commission Contact Page).
Should you still file by mail?
While mailing is a legal and acceptable way to submit your return, agencies continue to encourage electronic filing for both speed and security. According to the TaxAudit blog, e-filers experience faster refunds and easier corrections.
FAQs about other state tax return addresses
What is the mailing address for Oklahoma corporate tax returns?
Corporate income tax forms should be mailed to:
Oklahoma Tax Commission
PO Box 26800
Oklahoma City, OK 73126-0800
Where do I send my Oklahoma sales tax reports?
Sales tax reports are mailed to:
Oklahoma Tax Commission
PO Box 26850
Oklahoma City, OK 73126-0850
How do I find the mailing address for Oklahoma estate tax returns?
Estate tax returns should be mailed to:
Oklahoma Tax Commission
PO Box 53248
Oklahoma City, OK 73152-3248
What address should I use for Oklahoma gross production tax reports?
Send gross production forms and payments to:
Oklahoma Tax Commission
PO Box 269091
Oklahoma City, OK 73126-9091
Where do I mail my Oklahoma franchise tax reports?
Franchise tax documents go to:
Oklahoma Tax Commission
PO Box 26930
Oklahoma City, OK 73126-0930
