Learn what Third-Party Administrator (TPA) authorization is, why some tax agencies require it, and how it affects payroll tax filing and payments.
When using a payroll provider to file and pay payroll taxes on your behalf, some federal, state, and local tax agencies require additional authorization before they will allow a third party to act for your business.
Without the required authorization, payroll tax filings and payments may be delayed or rejected by the agency.
Understanding when TPA authorization is required can help prevent filing delays and ensure payroll taxes are submitted successfully.
What is Third-Party Administrator (TPA) authorization?
Third-Party Administrator (TPA) authorization is permission granted by an employer that allows a payroll provider to communicate with certain tax agencies and, when permitted, file returns and submit tax payments on the employer's behalf.
Each tax agency determines whether TPA authorization is required and establishes its own registration process.
Depending on the agency, authorization may allow the payroll provider to:
- File payroll tax returns
- Submit payroll tax payments
- Receive tax notices
- Communicate with the agency regarding payroll tax accounts
- View account information needed to process filings
Not every agency requires TPA authorization, and the requirements vary by jurisdiction.
Why is TPA authorization important?
If an agency requires TPA authorization and it has not been completed, the payroll provider may be unable to:
- File required payroll tax returns
- Submit tax payments electronically
- Access account information needed for filing
- Resolve filing issues with the agency
As a result, filings may be delayed until the required authorization has been completed.
In some situations, employers may need to file or pay directly with the agency until authorization is established.
When is TPA authorization required?
TPA authorization requirements vary by agency.
Some agencies require authorization before any payroll tax filing can be submitted, while others allow filings without additional authorization.
Requirements may also differ based on:
- Tax type (withholding, unemployment, paid leave, or local taxes)
- State or local jurisdiction
- Agency-specific enrollment processes
- Whether the employer has recently registered for payroll taxes
Because requirements vary, it's important to complete any requested authorization as soon as possible after registering with a tax agency.
What happens if TPA authorization is missing?
If required authorization has not been completed, you may experience one or more of the following:
- Payroll tax filings cannot be submitted
- Tax payments cannot be remitted electronically
- Filing attempts are rejected by the agency
- Payroll provider cannot communicate with the agency on your behalf
- Additional action is required before filing can continue
If this occurs, you may be asked to complete the authorization process directly with the agency before payroll tax processing can resume.
How do I complete TPA authorization?
The process depends on the tax agency.
Some agencies require employers to:
- Log in to the agency's online portal
- Approve or assign a Third-Party Administrator
- Complete an electronic authorization request
- Submit a paper authorization form
- Verify business registration information
Follow the instructions provided by the agency to complete any required authorization.
Best practices
To help avoid payroll tax delays:
- Complete all requested agency registrations promptly.
- Review onboarding tasks carefully to identify any required authorizations.
- Respond quickly to requests for additional documentation.
- Verify that tax account numbers and business information are accurate.
- Complete TPA authorization before your first payroll tax filing whenever possible.
Frequently asked questions
Is TPA authorization required for every tax agency?
No. Each federal, state, and local tax agency determines its own requirements. Some agencies require authorization, while others do not.
Can payroll taxes be filed without TPA authorization?
If an agency requires authorization, payroll taxes generally cannot be filed until the authorization has been completed.
Does TPA authorization give the payroll provider ownership of my tax account?
No. TPA authorization only allows the payroll provider to perform approved activities on your behalf. You remain the owner of your payroll tax accounts.
Can I revoke TPA authorization?
Yes. Most agencies allow employers to revoke or update authorization by following the agency's procedures.
Next steps
If you're unsure whether a tax agency requires Third-Party Administrator authorization, review the agency's registration requirements before your first payroll tax filing.
Completing any required authorization early can help prevent filing delays and ensure payroll taxes are