Add or remove Quebec sales taxes
GST is 5% and QST is 9.975%. Both apply to the price before tax. For an estimate before cent rounding, multiply the price by 1.14975; divide a tax-included total by 1.14975 to work backwards. This calculator rounds each tax separately and reconstructs the invoice in reverse mode.
Worked invoice example
A CAD 250.00 purchase has CAD 12.50 GST and CAD 24.94 QST, for CAD 287.44. Select “Remove GST and QST” and enter 287.44 to recover that example. A CAD 100.00 purchase totals CAD 114.98.
When does this apply?
This is a standard Quebec purchase subject to both taxes, not a Canada-wide tax calculator. Exempt or zero-rated supplies, rebates, special tax regimes and invoice-specific rounding may differ. A reconstructed total can differ slightly from the amount entered; any adjustment is shown.
Source: Revenu Québec: calculating GST and QST (French source).