Dedicated telephone service for income tax service providers: How to register

The Dedicated Telephone Service (DTS) offers free technical help for small and medium income tax service providers. Experienced CRA officers are available by telephone to help service providers find answers to complex income tax questions about the Income Tax Act.


To be eligible for this telephone service, you must be:

  • a small or medium income tax service provider who prepares Canadian income tax returns on behalf of clients; or
  • a Chartered Professional Accountant (CPA) or a non-CPA (such as a lawyer, bookkeeper, notary, or tax preparer) who prepares at least ten Canadian income tax returns for clients during a filing season.

Specialized tax professionals belonging to large firms – those with more than 50 partners – are not eligible for this service. They should continue to use the CRA’s Income Tax Rulings Directorate’s advance income tax rulings or technical interpretations service to address their tax issues.

Register for the DTS

  1. Complete the registration form.
  2. Email the completed registration form to:
    You can also email us if you need help or more information about the service.

After registration

After registration, you will receive a telephone number and a personal telephone access code (TAC) to connect with the DTS.

TACs are issued to registered participants for their exclusive use. If a registered participant permits another individual in the firm to use their TAC, that individual must follow the rules that would otherwise apply to the registered participant. These rules are described in the terms and conditions found on the DTS registration form.

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