GST QST Calculator Quebec 2026 (reverse included)
Enter a price before tax to see GST, QST, and total, or use reverse mode to find the pre-tax amount from a tax-included total. Current rates: GST 5%, QST 9.975% (two-step method, as used by Revenu Québec).
- 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.
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 this calculator on my phone?
Yes. The UI is mobile-first with instant updates and a copy button for the breakdown.
CalcQC is an independent website. We are not affiliated with Revenu Québec, Hydro-Québec, or any government agency. Results are for informational purposes only.