We received your Form 2848, 8821, or 706, and we assigned you a Centralized Authorization File (CAF) number.
What you need to do
- Keep this notice so you know what your CAF number is for all future third party authorization requests and telephone contacts with the IRS on behalf of the taxpayer.
You may want to
- Keep your CAF number in a safe place for future reference.
- Notify the IRS if this was assigned without your knowledge.
Answers to Common Questions
Q. What is a CAF number?
A. A CAF number is a unique nine-digit identification number that we assign to you the first time you file a third party authorization with the IRS. We send a CP547 notice to you informing you of your assigned number. Use your assigned number on all future authorizations.
Q. What should I do if I don’t remember my CAF number?
A. If you’re a tax professional and can’t remember your CAF number, you can call the Practitioner Priority Services (PPS) at 1-866-860-4259. Once you provide your authenticating information, they can verbally give your CAF to you over the phone. If PPS is unable to authenticate you as the owner of the CAF number, they will mail the number to the CAF address of record.
Tax publications you may find useful
- Publication 1, Your Rights as a Taxpayer (PDF)
- Form 8716, Election To Have a Tax Year Other Than a Required Tax Year (PDF)
- Form W-7A Application for Taxpayer Identification Number for Pending U.S. Adoptions (PDF)
- Form W-7 (SP) Solicitud de Número de Identificación Personal del Contribuyente del Servicio de Impuestos Internos (PDF)
- Full list of tax forms and instructions
How to get help
- Call the 800, 866 or 888 number listed on the top right corner of your notice.
- Authorize someone (such as an accountant) to contact the IRS on your behalf using Form 2848, Power of Attorney and Declaration of Representative (PDF)
- See if you qualify for help from a Low Income Taxpayer Clinic.