Quebec Sales Tax Calculator

How This Quebec Sales Tax Calculator Works

Quebec is unique among Canadian provinces: it charges the federal 5% GST plus its own 9.975% Quebec Sales Tax (QST), administered by Revenu Québec rather than the Canada Revenue Agency. This Quebec sales tax calculator handles both taxes simultaneously, showing GST, QST, subtotal, and total for any pre-tax amount or tax-included receipt. The combined effective rate is 14.975%.

Use the “Add Tax to Price” mode to add GST and QST to a quoted price, or “Remove Tax from Total” to extract them from a receipt. Both rates are editable so you can model rate changes or special cases. For businesses operating in multiple provinces, the all-province Canada sales tax calculator lets you switch between Quebec, HST provinces, and PST provinces in one place.

Quebec GST and QST Rates (2025)

• GST (federal): 5%
• QST (Quebec): 9.975%
• Combined: 14.975%

QST has been at 9.975% since January 1, 2013, when Quebec changed the calculation base. Before 2013, QST was applied to the GST-inclusive amount, which made the effective rate roughly 9.5% on 1.05 = ~9.975% — the headline number was adjusted at the same time the base changed so that the effective combined rate stayed close to 14.975%. Today both taxes apply directly to the pre-tax subtotal.

Quebec Sales Tax Formulas: Forward and Reverse

• GST amount = Subtotal × 0.05
• QST amount = Subtotal × 0.09975
• Total = Subtotal × 1.14975
• Subtotal (from total) = Total ÷ 1.14975

Worked example: a $500 pre-tax purchase → GST = $25.00, QST = $49.88, total = $574.88. Reverse a $574.88 receipt ÷ 1.14975 = $500.00 pre-tax. Worked example on a smaller purchase: $19.99 × 1.14975 = $22.98 total, with $1.00 GST and $1.99 QST. The reverse formula is the standard divide-by-one-plus-combined-rate approach — never multiply the total by 14.975% to extract tax, which overstates by about 2%.

QST vs PST vs HST: Why Quebec Is Different

QST looks like a provincial sales tax on the surface but operates as a value-added tax with full Input Tax Credit recovery for registered businesses — the same model GST and HST use. By contrast, the PSTs in British Columbia, Saskatchewan, and Manitoba are traditional retail sales taxes that cascade through the supply chain because registrants generally cannot recover PST paid on inputs.

This makes Quebec’s system functionally more like Ontario’s HST than like BC’s PST — the bookkeeping for QST-registered businesses parallels GST/HST closely. Quebec also has its own administrative agency (Revenu Québec) that collects both GST and QST under an agreement with the federal government, which is why Quebec businesses file with Revenu Québec rather than the CRA for both taxes.

QST for Small Businesses and Out-of-Province Sellers

Quebec uses the same $30,000 small-supplier threshold as the federal GST system. Once worldwide taxable revenue exceeds $30,000 in a calendar quarter or four consecutive quarters, registration for both GST and QST is mandatory. Registration happens through Revenu Québec via the joint GST/QST registration form. Once registered, you charge both taxes, claim Input Tax Credits and Input Tax Refunds (the QST equivalent), and file a combined return.

Since 2019, out-of-province and foreign suppliers of digital services to Quebec consumers must register for QST under a simplified system, even if they have no physical presence in Quebec. Specific thresholds and registration rules apply — consult Revenu Québec or a Canadian tax professional before assuming an out-of-province business is not subject to QST.

Pricing Strategy: Showing QST on Quotes and Receipts

Quebec law requires registrants to show GST and QST as separate line items on invoices and receipts — you cannot combine them into a single “sales tax” line. Many point-of-sale systems print “TPS” (Taxe sur les produits et services) for GST and “TVQ” (Taxe de vente du Québec) for QST, which are the official French names. Display GST/QST registration numbers on invoices over $30 to allow business customers to claim their own ITCs.

When pricing for the Quebec market, use this calculator together with our markup calculator to figure out a shelf price that hits your margin after both taxes, then check your unit economics with the profit percentage calculator.

Common Quebec Sales Tax Mistakes

• Applying QST to the GST-inclusive amount. The pre-2013 rule no longer applies — both taxes apply to the same pre-tax subtotal.
• Charging QST to out-of-Quebec customers. Place-of-supply rules send most sales to the destination province’s rate. An Ontario customer pays Ontario HST, not Quebec QST.
• Filing with CRA instead of Revenu Québec. Quebec businesses register and file both GST and QST through Revenu Québec.
• Forgetting that books are QST-exempt but GST-taxable. Books are one of the items where the two taxes diverge.
• Combining taxes on receipts. Invoices must show GST and QST as separate amounts, with both registration numbers visible on amounts over $30.

Disclaimer

This calculator is for informational purposes only. GST and QST rules change; verify current rates with Revenu Québec or the Canada Revenue Agency before relying on a calculation for a business filing or contract. Consult a Quebec tax professional for guidance specific to your situation.