Just to add a detail, using compounding Tax Rates is not necessary. The tax rules are 5% GST applied to the SubTotal, then 9.5% QST applied to the SubTotal+GST. However, the latter is the same as 9.975% QST applied to the SubTotal, with the SubTotal, 5% GST and 9.975% QST then arithmetically added to arrive at the total. So it can be either 9.5% QST compounded on 5% GST or 9.975% QST arithmetically added to 5% GST.