Hi Deep R,
From what I know, If you sell more than 30,000 of goods or services per year you MUST charge the GST on all sales in Canada.
The PST I believe is optional (not sure). The main advantage in charging it is that you can get back the PST that YOU pay for items related to your business.
If you are charging the PST, you ONLY charge it for sales in your province.
You could ask a lawyer or accountant - that would be safest. You could also call revenue Canada for the GST and the ministry of finance in your province for the PST. I have found both services to be reasonably friendly and helpful for basic stuff.
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