My boyfriend just ordered $21 worth of food on Uber Eats, of which he used a $15 off coupon (EATS-R1HZWBSHJ8). He has to pay $6 for the food and still pay $2.73 worth of HST on the food he ordered. This $2.73 is calculated by 13% of Ontario province. So he made up his mind, and he is searching for the tools to get the amount. He calculates the GST/PST through the tax calculator at  HSTCalculator.onl. https://hstcalculator.onl/