A CAF number, PTIN and EFIN each serve distinct roles in tax practice operations. A CAF number is a nine-digit identifier the IRS assigns when a third-party authorization is first filed, whether for an individual or a business entity. A PTIN identifies paid tax return preparers and may not be shared among individuals. An EFIN is issued to individuals or firms approved as authorized IRS e-file providers. Treating these identifiers as interchangeable or mistaking a number for authorization itself creates operational risk.
What Each Identifier Does
The IRS issues a CAF number when you file Form 2848 or Form 8821 on behalf of a client. The number stays with the designee or representative—individual or entity—and should appear on later authorizations for the same party. The CAF number does not grant authority; it identifies the party named on filed authorization forms.
A PTIN identifies paid tax return preparers, and the IRS FAQ explains which covered work triggers the requirement, including exclusions for purely mechanical or administrative assistance. Each preparer must obtain their own PTIN; sharing is not permitted. Check the current PTIN FAQ to determine whether a specific task requires an individual PTIN. Holding a PTIN does not make a person eligible for every IRS service or automatically grant access to client transcripts.
An EFIN identifies a provider approved to participate in IRS e-file. The approval process and the identifier itself are separate from third-party authorization and from preparer tax identification.
Identifier/Task Matrix
| Identifier | Assigned To | Primary Role | What It Is Not |
|---|---|---|---|
| CAF | Individual or entity | Links filed third-party authorizations | Client authorization or access credential |
| PTIN | Individual preparer | Identifies paid return preparers | Representation authority or e-file approval |
| EFIN | Individual or firm | Identifies approved e-file provider | Transcript access or preparer identifier |
CAF Pending Review vs. Form Pending
The IRS may place a CAF number in pending review, which can suspend activity including transcript requests. This status applies to the CAF identifier itself. The IRS describes activity including transcript requests as suspended; it does not state that every authorization linked to the number is revoked. It is not the same as a single submitted form waiting for processing.
When a CAF number enters pending review, follow current IRS guidance and any notice you receive for the affected activity, including transcript requests. Track that status separately from the receipt and processing of each submitted Form 2848 or 8821. A receipt alone does not establish that an authorization has been accepted or that a particular request will succeed.
Check the status of both the CAF number and individual submitted forms. A form may be delivered and awaiting processing while the CAF number remains active, or a CAF number may enter review after forms were already processed. Document which state applies when access attempts fail.
Common Operational Mix-Ups
Assuming a CAF number means current access. The presence of a CAF number confirms that at least one authorization was filed at some point. It does not prove a current, processed authorization exists for a specific client, tax period or type of matter. Before attempting to retrieve transcripts or represent a client, verify that a properly executed, in-scope authorization has been filed and processed.
Treating a PTIN as an access credential. A PTIN identifies a paid preparer. It does not grant eligibility for IRS Transcript Delivery System access or substitute for client authorization. TDS access requires separate eligibility as an Electronic Return Originator or Circular 230 practitioner, a properly executed Form 2848 or 8821 on file, and login credentials.
Confusing EFIN approval with authorization to act. An EFIN allows a provider to submit returns electronically. It does not authorize the provider to request client information, represent clients before the IRS, or access transcripts without a separate, properly filed authorization form.
Sharing identifiers. PTINs are individual and may not be shared. CAF numbers identify the party named on authorization forms; they are not credentials to distribute. EFINs belong to the approved provider. Operational processes should prevent identifier misuse and keep access responsibilities clear.
Tracking Status When Access Fails
When a transcript request or representation attempt is denied, check each layer:
- [ ] Confirm the correct CAF number appears on the authorization form.
- [ ] Verify the CAF number is not in pending review status.
- [ ] Check whether the submitted authorization form has been processed and recorded.
- [ ] Confirm the person attempting access meets the eligibility requirements for the specific service they are using, using current IRS guidance for that service rather than assuming one credential set covers all of them.
- [ ] Review the scope and tax periods listed on the processed authorization.
- [ ] Document the observed failure and the status of each identifier.
Separate identifier status from form status from access-test results. An active CAF number does not mean the most recent form was processed. A processed form does not guarantee that the person logged in matches the named representative or that the request falls within the authorized scope.
Preparing Authorization Requests
When preparing a new authorization, use the CAF number already assigned to the designee or representative if one exists. If this is the first third-party authorization filed for that party, the IRS assigns a CAF number when that authorization is first filed. The number will then appear on future authorizations for the same individual or entity.
Include the appropriate identifiers where the form instructions call for them, but recognize that the signature, scope and eligibility of the named party determine authority. The identifiers link records; they do not create permission. Refer to current submission guidance for signature requirements, delivery methods and processing expectations.
Coordinating Identifiers Across Staff
In a multi-person practice, document which staff member holds which identifier and what authority each has been granted on client matters. A staff member who holds a PTIN may prepare returns but still lack representation authority. A person named on a Form 2848 may represent a client on specified matters, but representation authority on that form does not by itself establish that the person meets the paid-preparer PTIN requirement, which the IRS determines separately. A firm EFIN does not make every employee an authorized e-file provider for every client.
Build intake and assignment procedures that confirm the right person, with the right credentials and the right client authorization, handles each task. When access fails, the record of who attempted what with which identifier speeds diagnosis.
CAF, PTIN and EFIN in Context
When setting up a new engagement: Confirm the person who will act has the appropriate credentials, determine whether disclosure or representation authority is required, prepare the correct form with the correct CAF number, and plan how to track submission and processing.
When onboarding staff: Verify that anyone performing paid preparer work holds their own PTIN where the current IRS FAQ says one is required, confirm the eligibility required for each service that person will use, and clarify which authorizations each person may rely on. Staff obtain their own identifiers from the IRS rather than receiving them from the firm.
When access is denied: Check identifier status separately from form status, document what was attempted and what failed, and identify which layer needs resolution before the next attempt.
A tax practice relies on these identifiers daily. Knowing what each one does and does not do prevents wasted effort, failed requests and compliance gaps. For a coordinated view of how identifiers, authorizations and access fit together, see the IRS transcript software workflow guide.
Frequently asked questions
Does a CAF number mean I have permission to act for a client?
No. A CAF number is a nine-digit identifier the IRS assigns when a third-party authorization is first filed, and you use the assigned number on later authorizations for the same party. It identifies the party named on the form; it does not grant authority. Authority comes from the form itself and its scope, which differ depending on whether you filed Form 2848 or Form 8821.
Does everyone on my team need a PTIN to work on client matters?
It depends on the task. A PTIN identifies paid tax return preparers, and the IRS FAQ page explains which covered work triggers the requirement and which assistance does not. Each preparer holds their own PTIN and may not share it. Representation on a client matter is a separate question answered by the authorization you hold, so confirm the eligibility required for each service the person will use rather than assuming one credential covers everything.
A request failed. Does that mean my CAF number is suspended or my client's form was never received?
Not necessarily. A failed request gives you an error, not a diagnosis. Two different states exist: the IRS may place a CAF number in pending review, which can suspend activity including transcript requests, and receipt and processing of an individual authorization form are separate statuses to verify. Record the exact error and its scope, check the identifier and the authorization you are relying on separately, and confirm current IRS guidance before deciding what to do next.
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