Thank you for the clarification, Parnel. For the past 20--years I have been using an Alberta CA who has always advised -- since GST started -- that I should not factor any expenses made in Quebec or Ontario to include provincial sales tax in that fashion. Guess I should ask her again about that. [Can't really expect Albertans to know much about sales taxes... Live free or die, No taxation without representation, and all of that!]
Not sure if it worth refiling all those Quebec expenses, though.
Always nice to learn something new...