My understanding is that Alberta has no provincial sales tax, so the priority setting shouldn't be an issue (ie: 0% of subtotal, or 0% of subtotal+GST will give the same number... $0.00)
The priority setting is used when you want, for example, Tax#1 to be calculated directly on the subtotal, and Tax#2 to be calculated on subtotal+Tax#1. Since this is not what you need, just leave priority at 1 and everything should work out well.
Hope this is helpful,
Alan
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