Oklahoma Tax Commission (OTC) Edition Form BT-129, Revised 7-2026 3 pages Oklahoma

Form BT-129 — Oklahoma Power of Attorney

The Oklahoma Tax Commission form that lets a named person represent you, or your business, and receive your tax information for the tax types and periods you choose.

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Form BT-129 · Oklahoma Power of Attorney
The official Oklahoma Tax Commission (OTC) form, edition Form BT-129, Revised 7-2026 — blank
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Form BT-129 (2026) Oklahoma Power of Attorney — page 1 of 3
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Form BT-129 (2026) Oklahoma Power of Attorney — page 2 of 3
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Form BT-129 (2026) Oklahoma Power of Attorney — page 3 of 3
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Fill this form online Blank PDF from Oklahoma Tax Commission (OTC)

What is Form BT-129?

Form BT-129 is the Oklahoma Tax Commission's power of attorney. It authorizes one or more individuals to act for a taxpayer before the OTC and to get the forms and documents the taxpayer could get, for the tax types and reporting periods listed: individual income, corporate income, sales, withholding, gross production, use tax or another tax you name.

The form covers individuals and businesses. A business signs through an authorized officer, member, partner or fiduciary, who prints their name and title. You can't appoint a firm as such: you name a person within it, and you can add more representatives on page 2. Filing a new BT-129 automatically revokes earlier powers of attorney for the same matters and periods unless you tick the box to keep them. For future years, the OTC recognizes the POA for three years from December 31 of the year it receives the form, and it won't process a form that says "All" periods.

FileIt guides you through each section, checks that every tax type you tick has its period dates and that they run forwards, and fills the OTC's own PDF (Revised 7-2026). The taxpayer and the first representative can sign with FileIt's eSignature or by hand. You then submit it to the OTC yourself by fax, mail, in person or through OkTAP's power of attorney portal.

Who fills it
The taxpayer (person or business) and the representative being authorized.
Submit to
The Oklahoma Tax Commission: fax 405.522.1942, mail, in person at 300 N Broadway Ave, Oklahoma City, or online through OkTAP.
Pages
3: taxpayer, tax types and first representative; up to four more representatives; instructions.
Signatures
The taxpayer in Section III and one representative in Section IV.
Edition
Form BT-129, Revised 7-2026
Agency
Oklahoma Tax Commission (OTC)

Who needs to fill out Form BT-129?

  • Oklahoma taxpayers who want a CPA, enrolled agent, attorney or bookkeeper to deal with the OTC for them.
  • Business owners who want their accountant to handle sales tax or withholding questions and notices.
  • Spouses who each want to authorize the same representative (each files a separate BT-129).
  • Representatives who need a signed authorization before the OTC will discuss a client's account.

When to use Form BT-129

  • When you hire a tax professional to respond to an OTC notice, audit or account question.
  • When you change representatives (a new form revokes the old one for the same matters and periods unless you keep it).
  • When you add a tax type or a later period to an existing representative's authority.

What you need before you start

  • The taxpayer's legal or business name, SSN, FEIN or ITIN, mailing address, email and phone.
  • Each tax type to cover and the first and last reporting period for each.
  • Each representative's name, whether they are an attorney, tax preparer or other, mailing address, email and phone.
  • For a business: the name and title of the officer, member, partner or fiduciary signing. If they aren't on the OTC's records, Form BT-191 comes first.

What’s on Form BT-129

The 2026 edition has 3 pages. FileIt asks for it in 8 parts, and it is signed by Taxpayer and Representative:

  1. Section I: Taxpayer informationTaxpayer
  2. Section II: Tax types and periodsTaxpayer
  3. Section III: Taxpayer signatureTaxpayer
  4. Section IV: RepresentativeRepresentative
  5. Section IV-A: Additional representative 1Taxpayer
  6. Section IV-A: Additional representative 2Taxpayer
  7. Section IV-A: Additional representative 3Taxpayer
  8. Section IV-A: Additional representative 4Taxpayer

How to fill out Form BT-129, step by step

1 Section I: Taxpayer

Choose SSN, FEIN or ITIN and enter the number, then the legal name, mailing address, email and phone.

2 Section II: Tax types

Tick each tax type and give the period start and end dates. Use Other for a tax not listed. Tick the retention box only if you want earlier powers of attorney to stay in force.

3 Section III: Taxpayer signature

Sign and date. Someone signing for a business also prints their name and title.

4 Sections IV and IV-A: Representatives

Name each individual representative, mark attorney, tax preparer or other, and give their contact details. Only the representative in Section IV needs to sign.

Common mistakes to avoid

  • Writing "All" for the periods: the OTC won't process it.
  • Leaving out an end date, which limits the authority to the start date's reporting period.
  • Naming a firm instead of an individual within the firm.
  • Forgetting that a new BT-129 revokes earlier ones for the same matters and periods unless you tick the retention box.
  • Signing for a business when you aren't listed with the OTC as an officer, member or partner, without filing Form BT-191 first.

After you fill it out

Submit the signed form by fax, mail, in person or online through OkTAP. Mailed forms can take up to 10 business days to process.

Let your representative know when it has been submitted so they can contact the OTC.

FileIt keeps the signed copy in your vault in case you need to show who you authorized and when.

Fill out Form BT-129 online with FileIt

  1. Pick the person. Choose someone from People and FileIt fills in their name, date of birth, address and other details it already knows.
  2. Answer plain-language questions. One part of the form at a time, with the official help text beside each question — 96 fields in all. Your answers save as you go.
  3. Check the live preview. Watch your answers land on the real Oklahoma Tax Commission (OTC) form, and let FileIt do any worksheet arithmetic.
  4. Generate the official PDF. FileIt prints your answers into the agency’s own PDF and files it in that person’s folder in your vault. Sign it, or send it for e-signature.

FileIt fills the form — it never files or submits anything for you. Deliver the finished form to whoever asked for it, the way the form’s instructions say.

Start Form BT-129 now — it’s free

Form BT-129: frequently asked questions

What does Form BT-129 do?

It authorizes the individuals you name to represent you before the Oklahoma Tax Commission and to receive the tax forms and documents you would be entitled to, for the tax types and periods you list.

How long does an Oklahoma power of attorney last?

It covers the periods you list. For future years or periods, the OTC recognizes it for three years from December 31 of the year it receives the form.

Does a new BT-129 cancel my old one?

Yes, for the same matters and periods, unless you tick the box at the end of Section II to keep your prior power of attorney.

Can I name more than one representative?

Yes. Use Section IV-A on page 2 for up to four more. Only one representative signature is needed, in Section IV.

My spouse and I file jointly. Can we use one form?

No. The instructions say each of you submits your own Form BT-129.

How do I submit Form BT-129?

By fax to 405.522.1942, by mail to the Oklahoma Tax Commission, Oklahoma City, OK 73194, in person at 300 N Broadway Ave, Oklahoma City, or online through OkTAP's Access Power of Attorney Portal.

Official sources

FileIt is not affiliated with or endorsed by Oklahoma Tax Commission (OTC) or any government. This page explains the form in general terms and is not legal, tax or immigration advice. Always read the official instructions, and check that you are using the edition the recipient accepts. Page last reviewed 2026-10-19.

Fill out Form BT-129 online