Oklahoma Form BT-129 is the Power of Attorney form the Oklahoma Tax Commission (OTC) uses to authorize someone to represent you on state tax matters. Once the OTC accepts it, your representative can receive your confidential tax information, talk to OTC staff, and act for you on the specific tax types and periods you list. The form is free, and you can download the current version from the OTC’s site at oklahoma.gov.
Information to Gather Before You Start
Missing fields will get the form rejected as invalid, so pull everything together before you begin.
- Your full legal name and mailing address, exactly as they appear on your Oklahoma tax accounts.
- Your SSN if you’re filing as an individual, or your FEIN if you’re filing for a business.
- Your phone number.
- Any Oklahoma sales tax permit number or other OTC-issued permit number. Skip this line if it doesn’t apply.
- The representative’s name, mailing address, and phone number. Fax number is optional.
- The tax types and periods you want covered. Common ones are individual income tax, corporate income tax, sales tax, and withholding tax, but the OTC administers many others.
Decide in advance whether you want the authorization to cover specific periods or every period on file.
Who Can Represent You
Most people name an attorney, a CPA, or an enrolled agent. Under Oklahoma Administrative Code 710:1-5-27, those professionals are automatically recognized to represent taxpayers in administrative proceedings before the OTC. You can also name a family member, business partner, or another individual, but if the matter reaches a formal hearing, the OTC’s Administrative Law Judge may require that person to show good character and adequate qualifications before letting them participate.
Filling Out the Form
Taxpayer and Representative Information
The top of the form has two parallel blocks. Your identifying details go on the left, the representative’s contact information on the right. Check every field twice. The OTC’s own instructions warn that a POA with any missing information is invalid.
Tax Types and Reporting Periods
The middle of the form is a table for each tax type, the state tax number or description, and the years or periods covered. Be specific. For income tax, a tax year is enough, such as “2024” or “2023–2025.” For sales tax, you need actual start and end dates that match the reporting periods. To grant access to every tax type or every period on your account, write “ALL” in the relevant column.
Exceptions to Authority
By default, the form authorizes your representative to receive confidential information, obtain copies of any tax documents you could receive yourself, and represent you before the OTC on the listed matters. If you want to narrow that, for instance to let someone pull records but not negotiate for you, write those limits in the exceptions area below the authorization language. Leave the space blank if you want full authority.
Retention of Prior Powers of Attorney
Near the bottom is a retention/revocation section. Filing a new BT-129 automatically cancels every earlier POA on file for the same tax types and periods. If you want a prior representative to keep working alongside the new one, check the box to keep earlier POAs in effect. Overlook that box and your old representative loses access the moment the OTC processes your new form.
Signature Rules That Trip People Up
Both you and your representative have to sign. The OTC accepts electronic signatures, so you don’t have to print, sign, and scan.
A few things void the form:
- The same person cannot sign as both taxpayer and representative. The OTC rejects those outright.
- If the taxpayer is a corporation, a corporate officer with signing authority must sign. For a partnership, an authorized partner signs. For an estate or trust, the fiduciary signs. The signature certifies that the signer has authority to execute the POA for the taxpayer.
- The representative’s signature block includes checkboxes for the type of representation (attorney, CPA, enrolled agent, and so on). If none fit, check “Other” and add a brief description. Skipping this box makes the POA invalid.
Where to Send It
You can submit the completed form by mail or fax. No street address is needed.
Oklahoma Tax Commission
Oklahoma City, OK 73194
Fax: 405-522-1942.
The OTC doesn’t publish a guaranteed processing time. Allow several business days for staff to verify the information and record the authorization. Once processed, your representative can start contacting the OTC on your behalf about the matters you listed. If you’re up against an audit deadline, fax is faster than mail, and a follow-up phone call to confirm receipt is worth the effort.
Changing or Revoking a BT-129
A BT-129 stays in effect until you revoke it or file a replacement. It does not expire on its own.
Replacing the Representative
The simplest route is to file a new BT-129 for the same tax types and periods. The new filing automatically cancels prior POAs covering those matters unless you check the retention box. One form updates the representative and revokes the old authorization at the same time.
Revoking Without Replacing
To remove a representative without naming a new one, send the OTC a signed, dated written statement with your name, your SSN or FEIN, the representative’s name, and the tax types and periods affected. Use the same mailing address or fax number. Until the OTC processes the revocation, the prior representative technically still has access, so send it promptly if the situation is sensitive.
Representative Withdrawal
A representative can end their own authority by sending the OTC a written withdrawal with the taxpayer’s name, ID number, and the specific matters covered, so the OTC knows which authorization to close.