T
The Daily Insight

What is CAF number for CPA?

Author

Andrew Mclaughlin

Published Feb 24, 2026

A CAF number is a unique nine-digit identification number and is assigned the first time you file a third party authorization with IRS. A letter is sent to you informing you of your assigned CAF number. Use your assigned CAF number on all future authorizations.

Why do I need a CAF number?

A Centralized Authorization File (CAF) number is a nine-digit number assigned to you by the IRS the first time you file a Power of Attorney or a Tax Information Authorization. The number is used by the IRS to track your requests for client information, such as transcripts.

How do I look up my IRS CAF number?

Enrolled Agent, Paralegal 20,880 satisfied customers Currently, I have a CAF number (Form 8821) that is Second opinion] Currently, I have a CAF number (Form 8821) that is associated with a client matter. Because the client has been noncommunicative for more than a year, and I have received no correspond…

How is the CAF number assigned to you?

A letter is sent to you informing you of your assigned CAF number. Use your assigned CAF number on all future authorizations. The Centralized Authorization File (CAF) allows the input of codified additional acts authorized on a Form 2848, Line 5a.

How is a CAF number different from a tin?

CAF numbers are different from the third party’s TIN (Taxpayer Identification Number), EIN (Employer Identification Number) or PTIN (Preparer Identification Number).  CAF numbers may be assigned to an individual or a business entity. What is a CAF number? | Internal Revenue Service Skip to main content

What to do if you lose your CAF number?

If you are a tax professional and cannot remember your CAF number, you may call the Practitioner Priority Service, otherwise known as PPS. PPS may be reached at (866) 860-4259. To obtain or hear instructions on how to retrieve a lost or forgotten CAF number, you must first choose from the initial prompts.