GST QST Calculator Quebec 2026 (reverse included)
Enter a pre-tax amount or a tax-included total. QST applies to the price excluding GST (5% and 9.975%), the same way Revenu Québec calculates it on a bill.
Total (tax included)
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- Amount before tax
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- GST (5%)
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- QST (9.975%)
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- Total (tax included)
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2026 rates: GST 5% · QST 9.975% on price excluding GST.
Sources. Revenu Québec — GST and QST rates (new tab) · CRA — goods and services tax (new tab) · Last updated: 27 October 2026
Frequently asked questions
What are the GST and QST rates in Quebec in 2026?
GST (federal) is 5% and QST (provincial) is 9.975% on the selling price excluding GST. These rates have been unchanged since 2008 (GST) and 2013 (QST).
How is QST calculated relative to GST?
Revenu Québec commonly uses a two-step method: 5% GST applies to the pre-tax price, then 9.975% QST applies to the same pre-tax price (not on the GST-included amount).
What is reverse (tax-included) mode?
You enter the shelf price (tax included) and the tool estimates the pre-tax amount plus GST and QST portions. Cent rounding means some totals cannot be matched exactly.
Are these results official?
No. CalcQC is an independent informational tool. For filing or compliance, refer to Revenu Québec or a qualified professional.
Why might my total differ by a cent?
Each tax line is rounded to the nearest cent (half-cent rounds up). With the two-step method, this can differ slightly from a single combined 14.975% shortcut.
Can I use a single 14.975% rate?
Only as a rough shortcut. Revenu Québec applies QST to the price excluding GST, not to a GST-included amount. This calculator uses the two-step method with cent rounding on each tax line.
CalcQC is an independent website. We are not affiliated with the Tribunal administratif du logement, the SAAQ, Retraite Québec, the QPIP (Conseil de gestion de l’assurance parentale), the Canada Revenue Agency, Revenu Québec, Hydro-Québec, or any other government body. Results are for information only.