GST and QST Rates in Quebec
Quebec charges two sales taxes on most purchases: the federal GST at 5% and the Quebec Sales Tax (QST, labelled TVQ on French receipts) at 9.975%. Both rates have been frozen since January 1, 2013, so the math has not changed in over a decade. Added together they produce a combined rate of 14.975% applied to the pre-tax price.
The combined rate is exactly 14.975%, not 15%, and that quarter-point difference shows up on every receipt. On a $100 purchase the two taxes add $14.98 — $5.00 of GST and $9.98 of QST after cent rounding. That puts Quebec just below the 15% HST provinces of Nova Scotia, New Brunswick, Newfoundland and Labrador, and Prince Edward Island.
Other provinces differ enough to matter on big purchases: Ontario charges a single 13% HST, while British Columbia and Alberta apply only the 5% GST to most goods. Saskatchewan adds a 6% PST on top of GST and Manitoba a 7% retail sales tax. For comparisons south of the border, the California sales tax calculator and the Florida sales tax calculator break down US state rates.
How the GST QST Calculator Works
The tool runs in two directions. Add mode takes a pre-tax amount and stacks the 5% GST and 9.975% QST on top; remove mode takes a tax-included total and backs out the pre-tax price along with each tax component. Both modes use the same category rates, so the math stays consistent whichever way the receipt was written.
On the default $100 entry in add mode, the tool returns $5.00 of GST, $9.98 of QST, and a $114.98 total. The QST line shows $9.98 rather than $9.975 because merchants round each tax line to the nearest cent with half-cents rounding up. A $2,500 laptop order produces $125.00 of GST and $249.38 of QST for a $2,874.38 checkout price.
Component rounding can differ from the exact total by a cent on odd amounts. A $57.50 restaurant subtotal rounds to $2.88 GST and $5.74 QST, summing to a $66.12 bill even though the unrounded math gives $66.1106. Revenu Québec accepts either approach provided the merchant applies it consistently; most point-of-sale systems calculate tax on the ticket total rather than per item.
Why QST Is 9.975% and Not 9.5%
The odd 9.975% rate is the residue of a 2013 base change rather than a random number. Before January 1, 2013, QST was calculated on the price after GST was added. The rate was 9.5%, so a $100 item carried $5.00 of GST and then 9.5% of $105 — $9.98 — in QST.
When Quebec moved the QST base to exclude GST, it raised the rate to 9.975% so consumers would see no change: 5% plus 9.975% of the same $100 base still equals $114.98 at the register. The identity is exact — 1.05 × 1.095 equals 1.14975, the same factor as 1 + 0.05 + 0.09975. That is why the combined rate carries three decimal places instead of a clean 15%.
Earlier history shows the rate climbing toward that change: 8.5% in 2011 and 9.5% in 2012, both still calculated on the GST-included price. Anyone reconciling old invoices from those years needs the old base, since extraction math that assumes today's rules will misstate 2012 receipts by roughly 1.3% of the QST line. The current system is simpler: one base, two rates.
Removing GST and QST from a Receipt Total
Extracting the taxes from an all-in price requires division, not multiplication. The pre-tax amount equals the total divided by 1.14975 — so a $114.98 receipt hides a $100.00 base, $5.00 of GST, and $9.98 of QST. In remove mode the tool performs this division and reports each component separately.
The common mistake is multiplying the total by 14.975%. On that same $114.98 receipt, 14.975% of the total is $17.22 — overstating the true tax of $14.98 by $2.24. The percentage applies to the pre-tax base, which is smaller than the total, so any percent-of-total shortcut inflates the tax line on every single calculation.
Dividing by a rounded 1.15 is a second trap that stays small on receipts but grows with scale. On a $66.11 bill, 1.15 gives $57.49 while the correct 1.14975 divisor gives $57.50. On a $3,000 invoice the gap widens to $0.56 ($2,608.70 versus $2,609.26) — enough to matter when reconciling expense claims, which pairs naturally with the budget calculator for monthly tracking.
Zero-Rated and Special Categories
Not everything carries the full 14.975%. Basic groceries — plain bread, milk, produce, unprepared meats — are zero-rated for both GST and QST, so a $25 basket of staple foods rings up at exactly $25.00. The grocery category in the tool models this 0% + 0% treatment for basket checks and receipt audits.
Printed books get split treatment that exists almost nowhere else in Canada: GST does not apply, but QST does, at the full 9.975%. A $30 novel carries $2.99 of QST and zero GST for a $32.99 shelf total; a $20 textbook shows exactly $2.00. Quebec removed its long-standing book exemption in 2012, and the rule remains one of the province's most-searched tax questions.
The taxable side of the food aisle catches shoppers too: candy, soft drinks, snack foods, and heated prepared meals are fully taxable at the combined rate, and restaurant food always is. Prescription drugs and most medical devices are zero-rated for both taxes. When a markdown changes the price, the discount calculator shows the new pre-tax figure to feed into this tool before the taxes are applied.
How Quebec Compares Across Canada and Abroad
Quebec's 14.975% is the highest provincial sales-tax burden outside the 15% HST provinces, and just 0.025 points under them. On a $1,000 purchase the difference between Quebec and a 15% HST province is a quarter — $149.75 versus $150.00. The gap against Ontario's 13% HST is more meaningful at $19.75 per $1,000 of taxable spending.
Alberta's 5% GST-only system makes it the cheapest province for taxable purchases at $50 per $1,000, while British Columbia matches that GST and layers a 7% PST on most goods. Saskatchewan at a combined 11% and Manitoba at 12% sit between the extremes. For big-ticket buys, multiplying the pre-tax price by each province's combined factor gives a direct apples-to-apples cost comparison.
Beyond North America, VAT and GST systems vary widely — Australia at 10%, New Zealand at 15%, Singapore at 9%. For the Indian system with its CGST/SGST split and 5/12/18/28 slab rates, the GST calculator for India handles the equivalent add-and-reverse math, and the currency converter converts amounts before comparing tax-inclusive prices across currencies.
Small Suppliers, Registration and Input Tax Credits
Businesses must register once worldwide taxable sales exceed $30,000 over four consecutive quarters — the same threshold Revenu Québec uses for QST that the CRA uses for GST. Below it, registration is optional; small sellers who register voluntarily must then charge both taxes and file returns even on modest volumes.
Registered businesses recover the GST and QST they pay on business expenses through input tax credits. A $1,000 equipment purchase costs $1,149.75 at the register, but the full $149.75 returns as an ITC on the next filing — so pre-tax prices, not gross prices, should drive purchasing decisions. Quarterly filers watch that refund cycle turn four times a year.
The registration status matters for quoting too. An unregistered freelancer billing $1,000 keeps the full amount, while a registered one charging $1,000 pre-tax collects $1,149.75 and remits $149.75 to the tax authorities. Planning cash flow around that remittance cycle fits neatly into the business budget calculator, which tracks the operating envelope the remittances draw from.
Everyday Uses: Restaurant Bills, Tips and Price Checks
Restaurant bills are the most common place the two taxes collide with a third number: the tip. Tips are not subject to GST or QST in Quebec — the tax lines are calculated on the food and drink subtotal only. On the $57.50 example, taxes add $11.62 while a 15% tip adds $8.63 to the pre-tax base; the tip calculator settles the gratuity side of the math.
Sale pricing follows the same base logic. A coupon or markdown reduces the taxable price before either tax applies, so a $120 jacket marked down 25% is taxed on $90 — $4.50 of GST plus $8.98 of QST — never on the original sticker. Shelf comparisons should also use per-unit figures; the unit price calculator normalizes package sizes before tax so the comparison is honest.
Receipt audits are where remove mode earns its keep. To verify a merchant charged 14.975% and not 15% on a $2,874.38 laptop order, divide by 1.14975 — the $2,500 base, $125.00 of GST and $249.38 of QST confirm the correct rates were applied. Separating tax from spend across a month of Quebec purchases also makes monthly expense reviews far easier to reconcile.