How the Quebec Reverse Sales Tax Calculator Works
This reverse tax calculator extracts the before-tax amount from any Quebec receipt. Enter the total amount paid (taxes included) and it accurately separates the 14.975% combined tax into the base price, GST (5%), and QST (9.975%).
- Reverse calculation (tax included): Turn on “Amount includes tax?”. Enter the total from any Quebec receipt and the tool works backward to separate the 14.975% combined rate into its exact base price, GST, and QST components.
Understanding GST and QST in Quebec
The system consists of 5% TPS and 9.975% TVQ. Historically, TVQ was charged on top of the TPS ('tax on tax'), but this was abolished in 2013. Now, both taxes are calculated directly on the base subtotal.
Quebec is unique in Canada: Revenu Québec administers and collects both the 9.975% QST and the 5% federal GST on behalf of the CRA — meaning businesses with Quebec customers file both returns with a single provincial authority, not with the CRA. Since 2019, foreign digital service providers (Netflix, Spotify, Airbnb) exceeding $30,000 in annual sales to Quebec consumers must also register with Revenu Québec to collect QST, even without any physical presence in Canada.
- GST (Federal): 5%
- QST (Provincial): 9.975%
- Total: 14.975%
In Quebec, shelf prices are strictly displayed before tax. When you receive a receipt, you will see the 5% GST and 9.975% QST listed as two separate lines. Use the “Amount includes tax?” toggle to instantly reverse-calculate any Quebec total and recover the original before-tax price.
This table provides an overview of Canada's sales tax rates for 2026, broken down by province and
territory. It shows how the GST combines with provincial taxes - including
HST, PST, and QST - to determine the total sales tax rate applied to purchases across Canada.
The Total column reflects the combined tax rate consumers typically pay at checkout, helping
individuals and
businesses quickly estimate the final cost of goods and services depending on location.
At a combined rate of 14.975%, Quebec has one of the highest sales tax rates in Canada. The unique 3-decimal QST makes mental math particularly difficult without a calculator.
| Province / territory |
GST / HST |
PST |
QST |
Total |
| Alberta (AB) |
5% |
0% |
- |
5% |
| British Columbia (BC) |
5% |
7% |
- |
12% |
| Manitoba (MB) |
5% |
7% |
- |
12% |
| New Brunswick (NB) |
15% |
- |
- |
15% |
| Newfoundland and Labrador (NL) |
15% |
- |
- |
15% |
| Nova Scotia (NS) |
14% |
- |
- |
14% |
| Northwest Territories (NT) |
5% |
0% |
- |
5% |
| Nunavut (NU) |
5% |
0% |
- |
5% |
| Ontario (ON) |
13% |
- |
- |
13% |
| Prince Edward Island (PE) |
15% |
- |
- |
15% |
| Quebec (QC) |
5% |
- |
9.975% |
14.975% |
| Saskatchewan (SK) |
5% |
6% |
- |
11% |
| Yukon (YT) |
5% |
0% |
- |
5% |
Rates shown are based
on the most commonly applied public tax rates and may vary for certain goods, services,
or tax-exempt situations.
How to reverse-calculate GST QST in Quebec (tax-included to before-tax)
To reverse-calculate Quebec sales tax, divide the total including tax by 1.14975. For example, a receipt showing $114.98 means the before-tax price was $100.00 (114.98 ÷ 1.14975 = $100.00). The calculator splits the result into the exact GST and QST portions.
Before-tax amount = Total including tax ÷ (1 + 14.975%)
Before-tax amount = Total including tax ÷ 1.14975
Rules & Exemptions
- Physical books are exempt from QST (you pay only the 5% GST). However, digital books and audiobooks sold by foreign platforms are fully taxed.
- Most other goods, services, restaurant meals, and digital subscriptions are taxed at the full 14.975% rate.
