This makes sence, I am from Canada and have a HST account but does it go the other way to? If in Canada I do not charge tax in any other country like the US? when I order goods on line in the US to be shipped to me, sometimes I have to pay duty and tax when the package is delivered but sometimes not. Very confusing but don't want to make a mistake with the government. LOL
I can't see opening a tax account in every country you sell to.
If your in Canada selling to the US - No you do not charge Canadian taxes GST/HST ect.
Selling and shipping to different Provinces: If your in Ontairo and selling/shipping to Alberta you shound not be charging the HST because Alberta does not have a "harmonized tax" they pay only GST, you as the supplier in Ontari should only be charging GST. however If I am in Alberta and Shipping to Ontario I MUST charge the customer the HST . In the words of the CRA it's the desitantion that counts for tax calculation NOT the origin.
On-line for our US counter parts no if someone orders a product from you in say California you should not be charging us for and of your taxes. However if a Canadian comes into your store and buys from you yes.... you have to charge us taxes.