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 you find the information you need to interpret the provisions of the Income Tax Act.


To be eligible for this service, you must be a small or medium income tax service provider who prepares, or assists in the preparation of, Canadian income tax returns on behalf of individuals or businesses.

An income tax service provider is a firm, organization, or tax practitioner, such as an accountant, bookkeeper or lawyer, that provides audit, accounting, tax, and other advisory services.

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

Register for the DTS

  1. Complete the registration form and agree to the terms and conditions of using the service.
  2. Save and then email the completed registration form to:

As long as you meet the eligibility requirements, you may register as an individual, or one person may register on behalf of the firm/organization.

Email us if you need help filling out the form or if you want more information about the service.

After registration

Once registered, you will receive an email with our telephone number and an exclusive telephone access code (TAC). Each TAC is for the registered individual or firm/organization's exclusive use and should not be shared.

In the case of a firm/organization, all members of the firm/organization are bound by the terms and conditions of using the service. The full terms and conditions can be found on the DTS registration form.

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