The QST
registry on the Revenue Quebec website allows you to confirm a firm's QST number, and
to obtain the name of the Quebec Sales Tax (QST) registrant. See Revenu
Quebec Validation of QST and GST Numbers
For businesses: When
dealing with a new vendor, check to see if their QST
number is valid. This will help ensure that you will
receive your input tax credits.
For individuals: You
can check to see if a firm's QST number is valid, so you
don't pay GST/HST unnecessarily.