Independent information. Official sources. Better business decisions.About this resource
FrançaisStart a business

Verify a QST registration number

Check standard QST account format, request a transient official Revenu Québec API validation, and understand returned status and limitations.

An active corporation is not necessarily registered for sales tax. Tax registration and business incorporation are separate checks.
Ten digits, TQ and four digits. Do not enter an NEQ or payment information.

Checking sends this number to Revenu Québec’s API. We retain neither the number nor the result.

Open the official QST service (French)

  1. Use the right identifier

    A QST number has ten digits, TQ and four digits. A ten-digit NEQ alone does not validate QST registration.

  2. Ask Revenu Québec

    Submitting sends a request to the official API. An acceptable format does not establish registration. This site does not retain the response.

  3. Read the status and effective date

    The service can return registered or cancelled status, an effective date and a business name where supplied. Compare the supplier with your document.

Unexpected results and common errors

A local format error is not a Revenu Québec determination. The API may reject a number even when its structure looks correct. If no result is found, check the number on the document or ask the supplier.

A nine-digit QST number identical to a GST/HST number, without TQ, can relate to a selected listed financial institution. CRA handles those cases; do not enter them in this standard form.

Does correct format prove registration?

No. Only the official service can confirm the information it returns. Our format check is not confirmation.

Does this guarantee a trustworthy business?

No. Tax registration does not guarantee supplier quality or absence of fraud. Also compare the legal name, corporation number and official documents.

Official sources

Sources checked October 30, 2026. A QST response, when available, has its own check timestamp.

Revenu QuébecTechnical guidance and applicable conditions