This guide by @ekryski is excellent: “Sales Tax 101 for Canadian Startups” https://medium.com/@ekryski/sales-tax-101-for-canadian-startups-98d1a3df0bbe#---0-201.v8txh0vom …pic.twitter.com/oL7iyTGWk5
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I spent all day Friday and Saturday working on HST return stuff and have determined it's actually impossible to be accurate 
The best I can do is prove I tried really, really, hard, but because of multiple currencies and stuff perfection is unachievable 
deal with the us taxes and the IRS and then see if you feel the same, ours looks bad but it's actually pretty tame
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