GST calculator for Canada

How to calculate GST

To calculate GST, multiply the price before tax by 0.05; to find the total, multiply by 1.05. The Goods and Services Tax is a 5% federal tax charged on most sales in Canada, and in five provinces it is combined with the provincial tax into one Harmonized Sales Tax (HST).^[cra_rates]

Worked example. A $250 purchase in British Columbia carries $12.50 GST and $17.50 PST, $280.00 in total. BC's PST is a separate 7% tax charged on the price before GST, so it is never tax on tax. In Quebec the QST works the same way: 9.975% of the price before GST.^[rq_rules]

Remove GST from a total

To remove GST or HST from a total, divide the total by 1 plus the rate, not multiply it by the rate. A $113 receipt in Ontario is $100.00 before tax plus $13.00 HST; taking 13% of $113 would give $14.69, which is wrong. In Alberta, $1,000.00 paid includes $47.62 of GST (1,000 ÷ 1.05 = $952.38). Choose "Total paid" in the calculator to do this for any province; the lines always add back to the cent. To take the tax out of several receipts at once, use the reverse HST calculator.

GST calculator for BC and Alberta

In British Columbia the GST calculator adds two separate taxes, 5% GST and 7% PST, both on the price before tax, so $100 is $112.00 ($5.00 GST + $7.00 PST); in Alberta it adds 5% GST only, so $100 is $105.00.^[cra_rates] B.C.'s PST is administered by the province, not the CRA, so a B.C. business claims back only the GST part as an input tax credit. Choose British Columbia or Alberta in the calculator above.

GST rate in Canada by province

The GST rate in Canada is 5% in every province and territory; what changes is the provincial tax added to it. The table compares a $100 purchase.^{[cra_rates][rq_rates]} For all 13 provinces and territories at once, with any amount, use the sales tax calculator for Canada, and for HST provinces, including the federal and provincial split of each HST dollar, use the HST calculator.

Do you have to charge GST? The $30,000 small supplier threshold

You must register for and charge GST/HST once your worldwide taxable sales go over $30,000 in a single calendar quarter or over the last four consecutive calendar quarters; below that you are a "small supplier" and registering is optional.^{[cra_register]} Public service bodies such as charities use $50,000. Taxi and commercial ride-share drivers must register from their first fare whatever their sales.^[cra_rc4022]

The two triggers have different start dates. If one quarter alone goes over $30,000, you stop being a small supplier on the sale that crosses the line and charge GST/HST on that sale; register within 29 days. If you cross the line only over four quarters, small supplier status ends at the end of the month after that quarter, and tax starts on your next sale.^{[cra_register]} Registering voluntarily lets you claim input tax credits for the GST/HST you pay on business costs, but you must stay registered for at least a year.

What a GST/HST receipt must show

To claim the GST/HST it paid as an input tax credit, a business needs a receipt or invoice whose required details depend on its total: under $100, from $100 to $499.99, and $500 or more.^[itc_regs] These thresholds replaced the old $30 and $150 limits in 2021, and each calculator result on this site states the rule for its own total. Without the supplier's GST/HST number on a receipt of $100 or more, the CRA can deny the credit.

Charging customers? Check whether you have to register first with the small supplier test above, and see the HST calculator for HST receipts and Ontario's 5% point-of-sale rebate items.

Common GST mistakes

• Removing tax by subtracting the rate from the total (113 − 13%) instead of dividing by 1.13.
• Charging QST or BC PST on top of GST. Both are calculated on the price before GST.
• Using 15% for Nova Scotia. The HST there has been 14% since April 1, 2025.^[cra_rates]
• Using your own province's rate for a sale shipped to another province: the place-of-supply rules usually tax a delivered good at the buyer's rate.
• Forgetting the GST/HST credit, now the Canada Groceries and Essentials Benefit with its own payment dates, is a benefit for households, not a refund of tax paid by a business.

More Canadian tax and pay calculators

Each tool below answers one question with dated official figures and a worked example.

• HST calculator: Ontario 13%, Nova Scotia 14%, New Brunswick, Newfoundland and Labrador and PEI 15%.
• Reverse HST calculator: take GST, HST, PST or QST out of up to five receipt totals at once.
• GST/HST explained: which rate to charge across provinces, zero-rated and exempt sales, your GST number and filing deadlines.
• Sales tax calculator Canada: one amount, all 13 provinces and territories side by side.
• GST payment dates: 2026 dates and a calculator for the Canada Groceries and Essentials Benefit.
• Minimum wage Ontario, minimum wage BC, minimum wage Alberta, minimum wage Manitoba, minimum wage Nova Scotia and minimum wage Quebec: current rates with every province compared.
• Vacation pay calculator Ontario, overtime calculator Ontario and severance pay Ontario: Employment Standards Act minimums.
• Property tax Toronto: 2026 City of Toronto rates by property class.