Updated July 1st 2010
For all Canadian Customers taxes are added according to the province in which you reside. The following are the applicable taxes for each province:
Alberta - GST 5%
British Columbia - HST 12%
Manitoba - GST 5%
New Brunswick - HST 13%
Newfoundland - HST 13%
Northwest Territories - GST 5%
Nova Scotia - HST 15%
Ontario - HST 13%
Prince Edward Island - GST 5%
Quebec - GST 5%
Saskatchewan - GST 5%
Yukon - GST 5%
Customers located outside of Canada, are not charged sales tax. 
