Quebec sales tax calculator: GST and QST

A taxable sale in Quebec carries two taxes: the 5% federal GST and the 9.975% QST, 14.975% in all. Both are calculated on the same price before tax, and one agency collects both: Revenu Québec. Type an amount, choose to add or remove the taxes, and copy the breakdown.

Rates checked on September 25, 2026 against the official sources listed below.

Calculation

Add taxesRemove taxes

Amount before tax

For example 1,234.56 or 1234,56

Province or territory

Amount before tax: $100.00
GST (5%): $5.00
QST (9.975%): $9.98
Total: $114.98

Rates in force

Tax	Rate	Since	Collected by
GST (goods and services tax)	5%	January 1, 2008	Revenu Québec
QST (Quebec sales tax)	9.975%	January 1, 2013	Revenu Québec

Why 14.975% and not 15%

Until the end of 2012, the QST was 9.5% and was charged on a price that already included the GST, a tax on a tax. On January 1, 2013, Quebec took the GST out of the QST base and raised the rate to 9.975%, which was exactly the effective rate before. Each tax has been calculated on the price before tax ever since, which is why the total is 14.975% rather than a round number.

Each tax is rounded to the cent on its own. On a $100 invoice the GST is $5.00 and the QST is $9.975, rounded to $9.98. The total is $114.98, not $114.97 or $114.975.

Revenu Québec collects both taxes

This is what sets Quebec apart: for a business established in Quebec, Revenu Québec administers the GST/HST as well, not the Canada Revenue Agency. You register for both taxes in one place and file one return, the FPZ-500, which covers the GST and the QST. Since January 1, 2024, every registrant except charities has to file it electronically, through My Account for businesses or your financial institution's filing service.

The small supplier threshold is the same for both taxes: $30,000 of taxable supplies over four consecutive calendar quarters, or within a single quarter. Past it, registration is mandatory. Below it you can register voluntarily, which lets you recover the GST and QST you pay on purchases (ITCs and ITRs).

One example, both ways

Adding the taxes: $100.00
Amount before tax	$100.00
GST (5%)	$5.00
QST (9.975%)	$9.98
Total	$114.98

Removing the taxes: $100.00
Amount before tax	$86.97
GST (5%)	$4.35
QST (9.975%)	$8.68
Total	$100.00

To remove the taxes, divide the total by 1.14975, then check that the price you get plus its rounded taxes adds back up to the total.

In QuickBooks Online

In QuickBooks Online, open All apps, then Sales Tax and Overview. Pick Quebec as the province, enter the start of the tax period and the filing frequency Revenu Québec assigned you, and the reporting method (usually accrual). QuickBooks then creates the agency and the most common Quebec tax codes.

At filing time QuickBooks prepares the return for the period. You submit it to Revenu Québec yourself, in My Account with clicSÉQUR, then close the period in QuickBooks and record the payment or refund.

Quick answers

How do I work out the price before tax in Quebec?

Divide the tax-included total by 1.14975. For $100 including tax: 100 ÷ 1.14975 = 86.975…, so $86.97 before tax, $4.35 of GST and $8.68 of QST, which adds back up to exactly $100.00. Because each tax is rounded to the cent, the division alone can be a cent off; the calculator checks that the three amounts rebuild the total.

Is the QST charged on the GST?

No, not since January 1, 2013. The 9.975% QST applies to the price before tax, as the GST does. An invoice that charges QST on the price plus GST overcharges the customer by about 0.5% of the price.

Do I need a QST number if I already have a GST number?

A business established in Quebec that goes past the $30,000 threshold must register for both, and it does so with Revenu Québec. Both numbers then go on its invoices.

Before the return, in QuickBooks

This calculator settles one invoice at a time. If your books are in QuickBooks Online, Caribooks has an Autopilot loop, Sales tax check, that goes over last month before the return. It flags each sale or purchase with no tax code, with a code unusual for that customer or vendor, or with tax that does not match its code's rate, then totals the tax collected, paid and net for each tax agency. It only reads: nothing in your books changes.

What Caribooks does Plans

Other provinces and territories

Sources

Every rate and rule on this page comes from the official pages below, read on September 25, 2026.