Why am I being charged GST or HST?

all killer.  no filler.

All residents of Canada and customers using a credit card issued by a Canadian bank must pay the Canadian Goods and Services Tax (GST), which is currently 5%.

Some provinces charge a Harmonized Sales Tax (HST), which blends the federal GST with the provincial sales tax. Nova Scotia, New Brunswick, Newfoundland and Labrador, Ontario, and British Columbia all charge HST.