Compute GST/HST by province.
Total with tax
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Tax
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Pre-tax
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Your breakdown
Updates live as you type| Step (Ontario, add tax) | Amount (CAD) |
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Worked example
Take a $100 pre-tax purchase in Ontario, which is an HST province at 13 percent. In add-tax mode the calculator multiplies $100 by 0.13 to get $13.00 of HST, then adds it to reach a $113.00 total. Now flip to extract-tax mode with a $113.00 tax-inclusive price: it divides $113.00 by 1.13 to recover the $100.00 base, and the difference of $13.00 is the embedded HST. The same input produces a very different answer in British Columbia, where only the 5 percent federal GST is shown here ($5.00 of tax on $100) because BC charges its 7 percent provincial sales tax separately rather than harmonizing it. That province-by-province split is the whole point of the tool.
How it is calculated
There are two modes. Add-tax (exclusive) takes a pre-tax figure and multiplies by the province rate to get the tax, then sums the two for the total. Extract-tax (inclusive) assumes the price already contains tax, so it divides by one plus the rate to back out the base, and the remainder is the tax. The rate itself depends entirely on the province. GST is the flat 5 percent federal tax. Five provinces, Ontario at 13 percent and Nova Scotia, New Brunswick, Newfoundland and Labrador, and Prince Edward Island at 15 percent, harmonize federal and provincial tax into a single HST. The rest charge the 5 percent GST plus a separate provincial sales tax (BC, Manitoba, Saskatchewan) or QST (Quebec), which this tool reports on its own dedicated pages.