Anybody do Ecommerce in Canada? Do I charge tax on shipping?

I'm charging provincial rates + federal rates specific for each province, depending on where the customer lives.

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However, do I apply tax to what they pay in shipping? When Shopify pumps out a shipping quote, if it says $45, that's how much I pay to print the label. I never looked if I pay FedEx tax or not.

I wonder if these laws are different per province.

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God help me.