GST and QST calculator

An amount, a province, the tax breakdown. Reverse calculation from a tax-included amount works too.

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Understanding GST and QST calculation

Two taxes, one calculation base

In Quebec, a pre-tax price has the 5% federal GST and the 9.975% QST added to it. Both apply to the same amount — the one before tax. There has been no cascade since 1 January 2013: before that date, QST was calculated on the GST-included price, at a rate of 9.5%. The reform was revenue-neutral — 9.5% × 1.05 is exactly 9.975% — which is why the mistake still goes unnoticed among those who apply today's rate to the old base.

Working back to the pre-tax amount

This is the most requested calculation: you have a tax-included total and need to isolate the pre-tax portion, for instance to record a receipt. In Quebec, divide the tax-included amount by 1.14975. A total of $114.98 therefore corresponds to $100.00 before tax, $5.00 of GST and $9.98 of QST. Cent rounding does not always land cleanly: a one-cent gap can appear between the sum of the breakdown and the amount entered. The calculator reallocates it to the largest tax so the breakdown matches exactly what you typed.

Rates in other provinces

Ontario applies 13% HST, Nova Scotia 14% since 1 April 2025, and New Brunswick, Newfoundland and Labrador and Prince Edward Island 15%. British Columbia adds 7% PST on top of GST, Saskatchewan 6%, and Manitoba a 7% retail sales tax. As in Quebec, these provincial taxes apply to the pre-GST price, with no compounding. Alberta, the Northwest Territories, Nunavut and Yukon collect only the 5% GST.

And in France

French mainland VAT has a standard rate of 20%, an intermediate rate of 10%, a reduced rate of 5.5% and a special rate of 2.1%. The calculator offers all four, in both directions.

Official sources

Frequently asked questions

How do I remove tax from an amount in Quebec?

Divide the tax-included amount by 1.14975 to get the pre-tax amount. GST is then 5% of that result and QST 9.975%. Select "Tax included" in the calculator to have it done automatically.

Why is the combined rate 14.975% and not 14.9875%?

Because QST has not been calculated on the GST-included amount since 1 January 2013. The two taxes simply add up on the pre-tax base: 5% + 9.975% = 14.975%. The 14.9875% figure corresponds to the old cascading calculation, which no longer applies.

What is the sales tax rate in Nova Scotia?

Nova Scotia's HST has been 14% since 1 April 2025, down from 15%. It is the first GST/HST rate change in Canada since 2016.

Are the calculator's rates up to date?

Each rate is dated and linked to its official source in the calculator's code, and the rate applied is the one in force on the calculation date. Rates were verified against Revenu Québec, the Canada Revenue Agency and provincial governments.