The rates. The Agency's GST/HST rates table lists 5% GST for Alberta, British Columbia, Manitoba, Saskatchewan, Quebec, Northwest Territories, Nunavut, and Yukon; 13% HST for Ontario; 14% HST for Nova Scotia; and 15% HST for New Brunswick, Newfoundland and Labrador, and Prince Edward Island. The same table lists the separate provincial sales taxes that this calculator does not compute: 7% PST in British Columbia, 7% PST in Manitoba, 6% PST in Saskatchewan, and 9.975% QST in Quebec. Alberta and the three territories have no provincial sales tax.
Nova Scotia at 14%, not 15%. The Agency's historical table shows Nova Scotia at 15% from October 1, 2016 to March 31, 2025, and at 14% on or after April 1, 2025, when the province cut its provincial portion of the HST from 10% to 9%. This calculator uses 14%. A table or calculator still showing 15% for Nova Scotia is using the pre-April 2025 rate.
The two calculations. Add-tax: on a $100 pre-tax price in Ontario, the tax is $100 times 13%, which is $13.00, and the total is $113.00. Remove-tax: on a $114 tax-included total in Nova Scotia, the pre-tax price is $114 divided by 1.14, which is $100.00, and the tax is $114.00 minus $100.00, which is $14.00. On a $200 pre-tax price in Quebec, the GST is $200 times 5%, which is $10.00, and the total before QST is $210.00 — the 9.975% QST is charged on top of that and is not included here.
Place of supply. The Agency says the rate of tax to charge depends on the place of supply, which is where the sale, lease, or other supply is considered to be made. Its example: a furniture store in Vancouver that delivers a mattress to a customer in Toronto charges 13% HST, because the place of supply is Ontario. Choose the province or territory where the supply is made, not where the seller sits.
Zero-rated and exempt supplies. A zero-rated supply has a 0% GST/HST rate throughout all of Canada — basic groceries are the Agency's example — and some supplies are exempt. This calculator assumes the supply is taxable at the standard rate. If your sale is zero-rated or exempt, the tax is $0, whatever this calculator shows.
What this calculator leaves out. Provincial sales tax in British Columbia (7%), Manitoba (7%), and Saskatchewan (6%); Quebec sales tax (9.975%); whether a supply is taxable, zero-rated, or exempt; place-of-supply rules for services, digital products, and cross-border sales, which can change the province that applies; and input tax credits, which reduce the tax a registered business remits but do not change the tax charged on a sale.
Sources: Canada Revenue Agency, GST/HST calculator (and rates) (the GST/HST and PST rate table for every province and territory; Nova Scotia 14% on or after April 1, 2025 and 15% before that), and Canada Revenue Agency, Charge and collect the GST/HST (the rate depends on the place of supply; zero-rated supplies are 0% everywhere; provincial sales tax is calculated on the price without the PST), both opened at build time on November 8, 2026. No figure on this page comes from anywhere else.