That's a good question you brought up, Billy. I agree, you shouldn't be paying GST on both ends of a gift certificate...my guess would be that if you pay GST on the certificate up front on say $100(total $105 w GST), then when you spend your certificate on a $1000 purchase, you'll pay $900 plus GST which means you only pay GST on the $900 as long as the certificate is applied BEFORE the GST is worked out. Hope that makes sense.

Half of communication is listening. You can't listen with your mouth.