Application Programming Interface (API) Used to Validate a QST Registration Number

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Purpose of the service

To validate a business's QST registration number using an application programming interface (API).

The service provides the following information:

  • the status of the registration number;
  • the description of the status of the registration number;
  • the effective date;
  • the business's name;
  • the business's commercial name (if applicable).
Users Businesses, individuals in business, corporations and suppliers outside Québec
Required information The registration number (ten digits followed by the letters TQ and four more digits).
Note

If the QST registration number you wish to validate has only nine digits, does not include the letters TQ and is identical to the GST/HST registration number, the business is a selected listed financial institution. Revenu Québec has mandated the Canada Revenue Agency to administer the QST collected by such businesses.

To validate such a number, use the GST/HST Registry, available on the Governement of Canada website.

Important You can also use the Validate a QST Registration Number online service to validate a QST registration number.
How to use the API

To use this API, you must:

  • have abilities in application programming;
  • refer to the User Guide: Application Programming Interface Used to Validate a QST Registration Number (SW-340-V);
  • connect your tools to the API.
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