Finance Calc App

Canada GST/HST calculator

Add GST/HST to a price, or extract it from a tax-inclusive total. Pick 5% GST or your province's HST rate.

By Mitch Duncan Last reviewed Methodology
GST/HST rate: 5.00%

Federal GST is 5%. HST provinces combine it with provincial tax (e.g. 13% ON, 15% Atlantic). PST/QST may stack on top in others.

Price before GST/HST
$100.00
GST/HST amount
$5.00
Total incl. GST/HST
$105.00
Effective rate
5.00%

How GST, HST, and PST work in Canada

Canada layers a 5% federal Goods and Services Tax (GST) with provincial sales tax — and how they combine depends on the province. Five provinces (Ontario and the four Atlantic provinces) merge the two into a single Harmonized Sales Tax (HST): 13% in Ontario, 15% in Nova Scotia, New Brunswick, PEI, and Newfoundland & Labrador. Others charge GST plus a separate PST (or Quebec's QST) that you calculate alongside it. Alberta and the territories charge GST only — 5%.

Total = price × (1 + combined rate)

Worked example

A $100 purchase in Ontario at 13% HST: tax is $13, total $113. The same item in Alberta is $100 + 5% GST = $105. In a PST province like British Columbia you'd add 5% GST and 7% PST separately, both on the $100 base, for $112.

Zero-rated and exempt supplies

Basic groceries, prescription drugs, and most medical devices are zero-rated (taxed at 0%). Some supplies — residential rent, most health and educational services — are exempt, meaning no GST/HST is charged. Businesses registered for GST/HST claim back the tax they pay on inputs through input tax credits.

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Frequently asked questions

How do I add sales tax to a price?
Multiply the net (pre-tax) price by the tax rate to get the tax, then add it back. At a 10% rate, a 100 item carries 10 of tax for a 110 total — or in one step, 100 × 1.10 = 110. The calculator does this automatically in 'add' mode.
How do I remove tax from a tax-inclusive price?
Divide the gross (tax-inclusive) price by 1 plus the rate. At 10%, a 110 total divided by 1.10 is 100 net, leaving 10 of tax. A common mistake is to subtract 10% of the gross price — that gives the wrong answer, because the tax is a share of the net price, not the total.
What's the difference between sales tax, VAT, and GST?
They're all consumption taxes on goods and services, but they differ by country. The US charges state and local sales tax added at checkout; the UK charges Value Added Tax (VAT) at a 20% standard rate; Canada uses GST/HST (and sometimes PST); Australia charges a flat 10% GST. The arithmetic is the same — only the rate and rules differ.
Is the tax rate the same everywhere?
No. The US has no national rate — it's set by each state, county, and city and they stack, so it varies widely by location. The UK's standard VAT is 20% with reduced and zero rates for some goods. Canada's rate depends on the province. Australia is a flat 10%. Always use the rate that applies where the sale happens.
Are some goods tax-free?
Yes. Most systems exempt or reduce tax on essentials. The UK zero-rates most food, books, and children's clothing; Canada zero-rates basic groceries and prescription drugs; Australia makes basic food and many health and education services GST-free; many US states exempt groceries and medicine. This calculator applies one rate, so handle exempt items separately.
Why does dividing by the rate give the wrong tax amount?
Because tax is calculated on the net price, not the gross. If a 110 total includes 10% tax, the tax is 10% of the 100 net price, not 10% of 110 (which would be 11). To split a tax-inclusive total correctly, divide by 1 plus the rate to find the net price first, then subtract.

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