Taxes, payroll and business
GST and QST calculator
Add tax to a price or find the pre-tax amount of an invoice in Quebec.
Rates checked October 1, 2026
Your amount
Enter the amount of a taxable sale in Canadian dollars.
Quebec · CAD · GST 5% · QST 9.975%
Your result
Total including tax
$114.98
Calculation breakdown
- Before tax
- $100.00
- GST (5%)
- $5.00
- QST (9.975%)
- $9.98
- Total taxes
- $14.98
- Total including tax
- $114.98
How the taxes are calculated
GST (5%) and QST (9.975%) are calculated separately on the same pre-tax price. QST does not apply to GST. Each tax is rounded to the nearest cent; half a cent rounds up.
To remove taxes, the total is divided by 1.14975. We check nearby cent values for a price that matches the total after tax rounding. If none matches, a one-cent difference is shown in the breakdown.
For fully taxable sales in Quebec. Zero-rated or exempt sales and input tax credits are not calculated here.
Source: Revenu Québec| Before tax | GST | QST | Total including tax |
|---|---|---|---|
| $25.00 | $1.25 | $2.49 | $28.74 |
| $100.00 | $5.00 | $9.98 | $114.98 |
| $500.00 | $25.00 | $49.88 | $574.88 |
| $1,000.00 | $50.00 | $99.75 | $1,149.75 |