The Oklahoma Tax Commission mailing address depends on what you’re sending. The commission uses a set of dedicated P.O. boxes in Oklahoma City, each tied to a specific form or payment type, and mail sent to the wrong box can delay processing or push back a refund. The list below covers the addresses most filers need.
Oklahoma Tax Commission Addresses at a Glance
- Individual income tax returns (Form 511, Form 511-NR): P.O. Box 26800, Oklahoma City, OK 73126-0800
- Individual income tax payments (Form 511-V, EF-V): P.O. Box 26890, Oklahoma City, OK 73126-0890
- Estimated income tax payments: P.O. Box 269027, Oklahoma City, OK 73126-9027
- Sales, use, franchise, mixed beverage, waste tire, telephone surcharge, vehicle rental, and tourism taxes: P.O. Box 26850, Oklahoma City, OK 73126-0850
- Withholding reports and payments: P.O. Box 26860, Oklahoma City, OK 73126-0860
- Estate tax and gross production tax: Oklahoma City, OK 73194-1000 (no P.O. box)
- General correspondence: Oklahoma City, OK 73194
Individual Income Tax Returns
Resident filers using Form 511 and nonresidents or part-year residents using Form 511-NR mail to the same address:
Oklahoma Tax Commission
P.O. Box 26800
Oklahoma City, OK 73126-0800
This covers both the standard paper version and the 2D-barcode version of each form.
Individual Income Tax Payments
If you owe a balance, mail your check or money order with a Form 511-V payment voucher. The voucher helps the commission match your payment to the right account. Skipping it does not create a penalty, but it raises the chance the payment is misapplied.
The same P.O. box handles the EF-V voucher, which is used when you e-filed your return but need to mail the payment:
Oklahoma Tax Commission
P.O. Box 26890
Oklahoma City, OK 73126-0890
Make checks payable to the Oklahoma Tax Commission. Write your Social Security number, the tax year, and “Form 511-V” or “EF-V” on the check. Don’t send cash, and don’t staple the check to the voucher.
Estimated Tax Payments
Estimated income tax has its own P.O. box, separate from the return and payment voucher addresses:
Oklahoma Tax Commission
P.O. Box 269027
Oklahoma City, OK 73126-90271Oklahoma.gov. Mailing Addresses for Reporting and Remittances
Oklahoma’s estimated tax due dates generally follow the federal quarterly schedule: April 15, June 15, September 15, and January 15 of the following year. If a due date lands on a weekend or holiday, the deadline moves to the next business day.
Sales, Use, Franchise, and Related Business Taxes
Several business tax types share one P.O. box. Sales tax, use tax, franchise tax, mixed beverage tax, waste tire fees, telephone surcharge, vehicle rental tax, and tourism tax reports and payments all go to:
Oklahoma Tax Commission
P.O. Box 26850
Oklahoma City, OK 73126-0850
Withholding Tax
Monthly and quarterly withholding reports, payment vouchers, and remittances use a dedicated box:
Oklahoma Tax Commission
P.O. Box 26860
Oklahoma City, OK 73126-0860
Corporate Income Tax
Oklahoma requires all corporate income tax returns to be filed electronically, a mandate in place since tax year 2020.2Legal Information Institute. Oklahoma Admin Code 710-50-17-1 – Corporate Returns A paper Form 512 cannot substitute for an e-filed return.
For a mailed corporate tax payment, the addresses in the official OTC guidance don’t fully agree. The commission’s mailing address sheet lists P.O. Box 26800, Oklahoma City, OK 73126-0800 for corporate income tax forms.1Oklahoma.gov. Mailing Addresses for Reporting and Remittances The Form 512 instruction packet directs mailed payments to P.O. Box 26890.3Oklahoma.gov. 2025 Form 512 Oklahoma Corporation Income Tax Return Packet and Instructions If you’re mailing a corporate payment voucher, use the address printed on the voucher itself.
Estate Tax and Gross Production Tax
These filings don’t use a numbered P.O. box:
Oklahoma Tax Commission
Oklahoma City, OK 73194-10001Oklahoma.gov. Mailing Addresses for Reporting and Remittances
Amended Returns
Oklahoma has no separate amended return form. To amend, check the “Amended Return” box at the top of a new Form 511, complete Schedule 511-I (Amended Return Information), and mail it to the same address as an original return:
Oklahoma Tax Commission
P.O. Box 26800
Oklahoma City, OK 73126-08004Oklahoma Tax Commission. Form 511 Packet
If a change to your federal return triggered the Oklahoma amendment, include a copy of your federal Form 1040-X and any IRS documentation approving the federal change. The state amendment is due within one year of the federal change. Mail each tax year’s amendment in a separate envelope.
If the error affects only your Oklahoma return, the OTC suggests calling the Taxpayer Resource Center at 405-521-3160 before filing an amended return. A phone correction may be faster.
General Correspondence and In-Person Visits
For mail that isn’t a return, payment, or report, use the OTC’s central address:
Oklahoma Tax Commission
Oklahoma City, OK 731945Oklahoma Tax Commission. Contact
Don’t send returns or payments here. They won’t reach the correct processing unit, and your filing date could be delayed.
The OTC’s physical headquarters is at 2501 North Lincoln Boulevard, Oklahoma City, OK 73194. The Taxpayer Resource Center is open 7:30 a.m. to 4:30 p.m.5Oklahoma Tax Commission. Contact
You can also skip the envelope entirely by filing and paying through the Oklahoma Taxpayer Access Point (OkTAP), the commission’s online portal.6Oklahoma Tax Commission. Oklahoma Tax Commission
Protecting Your Postmark Date
When you mail a return or payment, the postmark on the envelope is your official filing date. Under USPS rules that took effect in late 2025, the postmark reflects the date of the first automated processing operation, which can be a day or more after the postal service took possession of the piece.
Near a deadline, certified mail is the safest option. The date on the certified mail receipt counts as your postmark, removing the risk of a delayed automated postmark. A certificate of mailing at the post office counter, available at no extra charge, is another option. You can also ask for a manual postmark at a retail counter, which will carry that day’s date.
If you use a private carrier, only certain services qualify for the timely-mailing-equals-timely-filing rule. Approved options include specific service levels from FedEx (such as Priority Overnight and Standard Overnight), UPS (such as Next Day Air and 2nd Day Air), and DHL Express.7Internal Revenue Service. Private Delivery Services (PDS) Standard ground shipping does not qualify.