CAF Provisioning & Troubleshooting

What Is a CAF Number — And Why Your Practice Needs One

The Centralized Authorization File (CAF) is the IRS's database of third-party authorizations. Every time a taxpayer signs a Form 2848 (Power of Attorney) or Form 8821 (Tax Information Authorization) naming a representative or appointee, that authorization is routed to a CAF processing unit and associated with a CAF number unique to the rep. Until your CAF number exists and your specific 2848 or 8821 has posted under it, the IRS systems — Transcript Delivery System, A2A, e-Services — treat you as a stranger to that taxpayer's account.

Practically, the CAF number is the key that unlocks:

• Pulling transcripts (TDS, A2A, manual phone requests).
• Speaking with PPS or an assigned employee about the taxpayer.
• Receiving copies of IRS notices.
• Signing agreements, returns (with 2848 signature authority), and correspondence on the taxpayer's behalf.

A nine-digit number, format XXXX-XXXXX, it is assigned once and stays with the practitioner for life — even if they change firms. It is not firm-specific, and it is not the same as any other IRS practitioner identifier.

See also: Chapter 2 — Getting your first CAF, Chapter 3 — CAF vs PTIN vs EFIN.

Getting Your First CAF — The 2848/8821 That Assigns It

There is no separate application for a CAF number. You do not file a form titled "Apply for CAF." Your CAF is created the first time you submit a Form 2848 or Form 8821 on which you are the named representative and the IRS does not already have a CAF on file for you.

The mechanics

Fill out a 2848 or 8821 for a real client, including your name, address, professional designation (CPA, EA, attorney, etc.), and — critically — leave the CAF number blank or mark "None" if that is the form's current instruction. When the CAF unit processes the form, they assign you a new CAF and notify you, usually by mail. You should also see the number reflected on the processed copy returned to you (where applicable).

Processing timelines vary considerably. Historically this has ranged from a few days to many weeks depending on submission channel and backlog. Submission channels are, roughly in order of speed:

• Tax Pro Account online submission — generally the fastest path when available and when the taxpayer completes their side.
• Fax to the appropriate CAF unit — faster than mail, with confirmation.
• Mail to the CAF unit — the slowest and most error-prone channel.

Getting notified of your assigned CAF

The CAF unit sends a notice confirming your assigned CAF number. Historically this is CP547, though notice numbers change over time. Once you have it, record it in:

• Your firm profile in TRH (or your transcript software of choice).
• Your standard 2848/8821 template, so future filings carry your CAF pre-populated.
• Your Tax Pro Account profile, if you use it.

See also: Chapter 4 — CAF sync window, TRH Form 2848 guide.

CAF vs PTIN vs EFIN — Which Is Which

Three IRS-issued identifiers sit on most tax pros' credentials pages, and they are routinely confused. They are not interchangeable.

Common points of confusion

• You can have a PTIN without a CAF — you prepare returns but have never been formally authorized to represent. Resolution work starts the moment a CAF enters the picture.
• You can have a CAF without an EFIN — you represent taxpayers on collection and audit matters but do not e-file returns through your own system.
• EFIN is the firm-level e-file license; PTIN is individual; CAF is individual.
• None of these numbers on their own authorize anything. A CAF without a processed 2848 does not let you see any specific taxpayer's account.

What an EA, CPA, or attorney needs specifically

Representing clients in front of the IRS requires eligibility under Circular 230 — typically an EA credential, CPA license, or law license. Unenrolled preparers have limited representation rights and cannot sign a 2848 for representation purposes in most matters. Having a CAF number does not grant representation authority on its own; you still need the underlying credential.

See also: Chapter 1 — What is a CAF.

The "CAF Sync Window" — Why Newly-Filed 2848s Don't Work Immediately

Every practitioner runs into this once: you file a fresh 2848, wait a day, try to pull transcripts, and the IRS systems report that you are not authorized. The form is in processing. There is a gap between when a 2848 is filed and when the authority becomes live across the various IRS systems that need to see it.

What is actually happening

A 2848 moves through several steps:

1. Receipt at the CAF unit (online, fax, or mail).
2. Review for completeness — rep info, taxpayer info, forms and periods, signatures.
3. Posting to the CAF database under the rep's CAF number.
4. Propagation to downstream systems: TDS, A2A, PPS call-routing, e-Services.

Each step takes some amount of time, and the propagation step is not instantaneous. Even after a 2848 has "posted" in the CAF database, it can take additional hours to a day or two before TDS and A2A honor it.

Realistic timelines

• Tax Pro Account online with taxpayer completing their side: shortest. Sometimes same-day, often within a few business days.
• Fax to CAF unit: historically 2–10 business days under normal conditions. Longer during peaks.
• Mail to CAF unit: several weeks is typical during busy seasons.

These ranges shift over time with IRS workload. The only reliable way to know whether your 2848 is live is to check: pull a transcript, or run a CAF list (see Chapter 7).

Speeding things up

• Prefer Tax Pro Account online submission when your client can participate.
• Fax rather than mail.
• Get the form right the first time — rejected filings restart the clock.
• Match rep information exactly (name, address, CAF) to what the IRS already has on file.

See also: Chapter 5 — Provisioning failures, Chapter 10 — When to call PPS.

Common CAF Provisioning Failures

When a 2848 gets rejected, the reason is almost always one of a short list. Knowing the list means you rarely file one that fails.

1. Rep information mismatched to IRS records

If your CAF record has you at an old firm address and you list a new one on the 2848 without updating your CAF profile, the form can bounce. Same for name changes, name suffix changes, or email changes. The 2848 rep block should match what the CAF unit has on file for you, or you should update your CAF record (Form 8822-B or similar process) before filing new 2848s.

2. Missing or incomplete Line 2 (tax matters)

Line 2 of the 2848 identifies the tax matters covered. The failure modes are:

• Form number blank or ambiguous.
• Tax period listed as a single year when multiple years apply.
• "All years" or "every year" language without specifying a range.
• Listing only "Form 1040" when you also need to represent the client on 941s or related forms.

Be specific. List every form number you need authority for, and every tax period. Ranges are generally acceptable in the form's own convention, but open-ended entries ("all years") are usually rejected.

3. Taxpayer identification errors

SSN or EIN typos, name-control mismatches (see the Transcripts guide, Chapter 2), and outdated addresses. The IRS matches the 2848 against the taxpayer's account; mismatches cause rejection even when the form is otherwise correct.

4. Missing or wrong signatures

The rep must sign. The taxpayer must sign. Joint returns generally require both spouses' signatures for joint matters. Date fields must be recent — 2848s older than a certain age at submission can be rejected as stale.

5. Missing designation information

Representative type (EA, CPA, attorney, enrolled actuary, etc.) and the corresponding credential number (bar number, EA number, state CPA license number) are mandatory for representation authority. Form 2848 rejects a rep who checks a box without supplying the required credential data.

6. Processing backlog ("it's not rejected, it's not processed")

Sometimes a 2848 has not failed — it has simply not been reached yet. Backlog is part of the IRS reality; during busy seasons, CAF processing has run weeks behind at times. Before assuming rejection, verify the form was received and is in queue (fax confirmation, online submission receipt) and check your CAF list (Chapter 7).

See also: TRH Form 2848 walkthrough, Form 8821 walkthrough.

When the IRS Strips Your CAF Authority

A processed 2848 is not permanent. Several events can remove your authority for a specific taxpayer or, in rare cases, disable your CAF entirely.

Taxpayer revocation

The taxpayer can revoke your authority at any time by notifying the IRS — typically by filing a new 2848 that supersedes the prior, or by a written revocation mailed or faxed to the CAF unit. When revocation posts, the Account Transcript typically shows a TC 961 entry. You will lose access on your next transcript pull without warning.

New rep supersedes old rep

When a taxpayer signs a new 2848 naming a different rep, the new form generally supersedes prior authorizations for the same tax matters unless the new form explicitly retains them. Tax pros are sometimes surprised to find they have lost access to a client simply because the client engaged another rep for an unrelated matter. The fix is a new 2848 that explicitly does not revoke the prior authorization, or simply a fresh filing re-establishing your access.

Identity-theft indicator on the taxpayer's account

When an ID-theft case opens (TC 971 AC 121), the IRS may freeze transcript access for all reps, not just the fraudulent one. Your legitimately filed 2848 still exists, but the account is under a broader hold. Resolution typically requires working through the ID-theft process and, sometimes, re-verifying rep authority after the freeze lifts.

Fraud or criminal referral on the rep

If the IRS Office of Professional Responsibility (OPR) opens a case against a practitioner, the outcome can range from a private reprimand to suspension or disbarment from practice before the IRS. A suspended rep's CAF-based access is disabled during the suspension. This is a rare but serious event; Circular 230 governs the process.

Revocation by the IRS for administrative reasons

Deceased practitioners, retired practitioners who have requested removal, and practitioners whose credentials (EA, CPA, bar) have been revoked at the state level all lose CAF access. Administrative revocations of this type are rare and almost always follow an event the rep is aware of.

What to do when you lose access unexpectedly

1. Pull your CAF list (Chapter 7) to confirm the scope of what changed.
2. Check the taxpayer's Account Transcript for a TC 961 (if you still have any access) or a TC 971 AC 121.
3. Contact the taxpayer to confirm whether they revoked or engaged a new rep.
4. If nothing on the taxpayer side changed, call PPS — there may be an administrative issue the CAF unit can explain.

See also: Chapter 7 — CAF list, Chapter 10 — PPS.

Monitoring and Maintaining Your CAF

The CAF is not a set-and-forget database. You should be checking it periodically — both to confirm that recent filings posted and to catch drift, like clients who added or removed authorizations without telling you.

Running a CAF list

A CAF list (sometimes called a CAF77 list, for the internal form number) is a report of every taxpayer and tax period currently authorized under your CAF number. You can request it through e-Services or by written request. The report shows:

• Taxpayer name and TIN.
• Form numbers authorized.
• Tax periods authorized.
• Authorization type (2848 vs 8821).
• Posting date.

Pull a CAF list quarterly at minimum, monthly in active practice. It is the single best tool for catching both posted-but-you-didn't-know-it authorizations and revoked-authorizations-you-didn't-expect.

Keeping your rep record current

Update your CAF record whenever:

• You change firms (address, phone, fax).
• Your credentials renew (EA every three years; CPA state renewals).
• You legally change your name.

Stale rep records are a leading cause of 2848 rejects even when the substantive form is correct.

Annual hygiene

Once a year, pick a slow week and:

1. Run a full CAF list.
2. Match it against your active client list.
3. Revoke authorizations for clients you no longer represent, especially ones where you still have access you do not need.
4. Confirm active clients have the form and period coverage you expect.
5. Update rep record fields that have drifted.

See also: Chapter 5 — Provisioning failures.

Adding a Secondary CAF — Firm, Personal, Multi-State

A CAF number is per-practitioner, not per-firm. However, there are scenarios where more than one CAF is in play.

A firm does not have its own CAF

There is no "firm CAF." 2848s name individual reps, each with their own CAF. When a firm refers to "the firm's CAF" informally, they usually mean the CAF of the partner who signs most 2848s. Multi-practitioner firms typically have multiple CAFs — one per credentialed rep — all referenced on 2848s as appropriate.

Listing multiple reps on a 2848

Form 2848 allows more than one representative. When you list two reps, both CAFs are associated with the authorization, and both can act on the case. This is the standard mechanism for "my partner handles the CP2000 responses while I handle audits" setups — list both on the same 2848 from the start.

When you move firms

Your CAF stays with you. Existing 2848s listing you as rep stay valid with respect to your authority, but the address on file for you may now be wrong. Update your rep record promptly; otherwise the IRS may send correspondence and notices to your old firm.

Multi-state or specialty practice

A state CPA license does not limit CAF authority geographically — a CAF rep can represent a taxpayer anywhere in the US, provided they have the underlying credential (EA, CPA, attorney). Attorneys licensed in one state can represent federal-tax matters nationally under Circular 230. There is no geographic sub-CAF.

Do you ever actually "add a second CAF"?

In practice, rarely. A practitioner should have one CAF. If you have accidentally been assigned two CAFs (e.g., one from an early filing that slipped through without a prior check), contact the CAF unit to merge. Two active CAFs for a single person is an administrative error, not a feature.

Delegated-User Access — Multiple Pros Sharing a CAF

The IRS's e-Services and Tax Pro Account systems support delegated-user access: a practitioner with their own credentials can grant limited system access to employees or partners. This is distinct from CAF authority.

What delegation covers

A delegated user can, under the principal's supervision:

• Log into e-Services / Tax Pro Account using their own identity.
• Access transcript products for which the principal has 2848/8821 authority.
• Initiate certain requests on the principal's behalf.

Delegation does not grant the delegated user their own CAF authority — they act under the principal's. If the principal's authorization is revoked, the delegated user's access to that client disappears.

What delegation does not cover

• Signing 2848s or 8821s in the principal's name.
• Representing taxpayers at audit or appeal in the principal's place (this requires the delegated user to be named on the 2848 themselves, with their own credential).
• Any action that requires the principal's personal credential verification.

Setting up delegation

Delegation is configured in the principal's e-Services account. The exact UI has changed over the years as the IRS has moved toward the Tax Pro Account; current instructions should be checked against live IRS documentation. General pattern:

1. Principal logs into e-Services or Tax Pro Account.
2. Navigates to delegated-user / authorized-user administration.
3. Invites the delegated user by email or identifier.
4. Delegated user accepts the invite and verifies their own identity.
5. Principal assigns specific permissions (transcript access, etc.).

When delegation makes sense

• A practitioner with a staff assistant who pulls transcripts on their behalf.
• A multi-partner firm where one partner's CAF handles a client family, but associates need access.
• Any workflow where an unenrolled staffer is doing routine file work under supervision.

When an associate needs independent authority, the right answer is usually their own CAF and their own 2848, not delegation.

When to Call PPS — And What to Have Ready

The Practitioner Priority Service (PPS) is the IRS's dedicated line for tax pros. It is faster than the general taxpayer line but can still involve significant hold time during busy periods. The goal on every PPS call is to finish the case on the call — which means being prepared before you dial.

When PPS is the right tool

• Stale TC 570 with no apparent resolution.
• A 2848 you can see is filed but is not yielding transcript access (i.e., propagation issue you want confirmed).
• Unrecognized CAF revocation you want explained.
• Adjustments that appear on a transcript but no notice received.
• Installment agreement balance questions or setup when the online system will not work.
• Reasonable-cause penalty-abatement requests when online / written processes have failed.

When PPS is not the right tool

• CDP hearings — go to Appeals, not PPS.
• Exam questions where you have an assigned examiner — call the examiner.
• Collection cases with an assigned Revenue Officer — work the RO.
• Offers in Compromise under consideration — work the assigned offer specialist.

Pre-call checklist

Before you dial, have:

1. A current 2848 on file for the taxpayer and year in question.
2. The taxpayer's SSN/EIN and name control.
3. Your own CAF number, PTIN, and a photo ID reference (they may ask).
4. The specific Account Transcript for the year at issue, printed or on a second screen.
5. The notice number if a notice triggered the call.
6. Your question, written down in one or two sentences.
7. A time block — do not start a PPS call with a hard stop in 20 minutes.

During the call

• Identify yourself and your authority early. "I am [name], CAF [number], calling with authority on Form 2848 for [taxpayer], tax year [YYYY]."
• Answer the authentication questions cleanly — taxpayer's address, filing status, prior-year AGI.
• State the specific question.
• Ask the employee's name and ID number for the call log.
• Take notes on what they say, and read back anything critical.

When to escalate above PPS

• If you have an economic-hardship or immediate-collection situation, the Taxpayer Advocate Service (TAS) is the right channel — Form 911.
• If an employee on the call refuses to answer something you believe you are entitled to, ask politely for a manager.
• Circular 230 issues with the rep's own access belong with OPR or the rep's professional organization.