Quebec Reverse Tax Calculator
Estimate the pre-tax price and included GST and QST for Quebec, Canada tax-inclusive prices. You might be backing GST and QST out of one total or checking the pre-tax amount on a receipt—when both taxes sit on one line, the same divide-by step applies. This page uses one combined reference rate so you can check your numbers quickly.
Calculator
Calculate tax backwards
$137.45 at 14.975% GST/QST: pre-tax $119.55, GST/QST $17.90.
Estimate only. Verify official rates before filing, invoicing, or making tax decisions.
Calculator
Quebec Reverse Tax Calculator
Starting rate
14.975%
Rate source
Revenu Québec — basic GST/HST and QST rulesLast updated
2026-05-15
Formula
How reverse tax calculation works
Start with the tax-inclusive total, then divide by 1 plus the tax rate. Use the tax rate as a decimal in the formula.
Pre-tax Price = Total Price / (1 + Tax Rate)
Tax Amount = Total Price - Pre-tax Price
Example
$137.45 CAD with 14.975% GST/QST
- Tax multiplier = 1.14975
- Pre-tax price = 137.45 / 1.14975 = 119.67
- Estimated GST/QST amount = 17.78
Region
Quebec tax context
Country
Canada
Tax system
GST + QST
Rate shown
14.975%
Quebec commonly combines federal GST and Quebec QST for tax-inclusive estimates. Always verify the rate for the exact product, location, and filing period before making tax decisions.
Rate breakdown
Estimated split for $137.45.
- Federal GST5% rate shown
- 5% / $5.98
- Quebec QSTQST is calculated on the selling price excluding GST.
- 9.975% / $11.92
Source checked 2026-05-15: Revenu Québec — basic GST/HST and QST rules. Common taxable goods and services in Quebec use 5% GST plus 9.975% QST. Some goods and services can be exempt or zero-rated.
FAQ
Common questions
How do you reverse calculate tax?
Divide the tax-inclusive total by 1 plus the tax rate. For example, with a 20% tax rate, divide the total by 1.20.
What is the reverse tax formula?
Pre-tax price = total price / (1 + tax rate). Tax amount = total price - pre-tax price.
Is this calculator tax advice?
No. This is an educational calculator for estimates. Confirm official rates and rules before filing, invoicing, or relying on the result.
What Quebec tax rate does this calculator use?
This page starts with 14.975% as a combined GST/QST rate for common estimates.
Does Quebec QST apply on top of GST?
For the current common calculation, QST is calculated on the selling price excluding GST. This page treats 5% GST plus 9.975% QST as a combined 14.975% reference rate.
Can some Quebec items use a different tax treatment?
Yes. Some goods and services can be exempt, zero-rated, or treated differently. Use the rate that applies to the item and verify with Revenu Québec before relying on the result.
How do I reverse GST and QST from a total?
Treat the tax-inclusive total as gross, then divide by one plus the combined decimal rate. For the common 5% GST plus 9.975% QST stack, many receipts behave like a single 14.975% multiplier on the pre-tax base, which is what this calculator starts with. People often phrase the same step as reverse calculating GST and QST from one total.
How do I back out GST from a total that also includes QST?
You still isolate the pre-tax base first by dividing the tax-inclusive amount by 1.14975 when that combined reference matches your line. After you have the net price, you can split GST and QST using Revenu Québec rules if you need separate amounts for accounting.
What is TVQ, and is it the same as QST?
TVQ (taxe de vente du Québec) is the French name for Quebec sales tax. In English contexts you usually see QST; both refer to the same provincial consumption tax that works alongside federal GST.
How do I remove GST from a price in Quebec when the shelf price includes GST and QST?
Removing GST from a price usually means finding the pre-tax base first. When QST is already included in the same all-in figure, divide the total by 1.14975 for the standard stack; that quotient is the pre-tax amount before you split GST and QST using Revenu Québec rules if you need separate lines. For a generic remove-tax flow that is not Quebec-specific, compare the remove tax from price and pre-tax price calculators.
Is this page a GST reverse calculator for Quebec only?
Yes. The defaults use CAD, Quebec context, and the common combined GST and QST reference. If your supply is outside Quebec or uses a different tax treatment, switch to the calculator that matches your jurisdiction or adjust the rate manually.
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