GST/HST calculator

Add tax to a price, or work backwards to find the GST/HST already buried inside a total. Rates are current for 2026 and cover all thirteen provinces and territories.

GST/HST rates by province, 2026

PST, RST and QST are separate provincial taxes. They are not part of GST/HST and cannot be claimed as an input tax credit on your GST/HST return.

How the reverse calculation works

The most common mistake is multiplying a tax-included total by the tax rate. That overstates the tax, because the rate applies to the subtotal, not to the total.

Divide instead. With 5% GST, the subtotal is the total divided by 1.05, and the tax is whatever is left over. On a $105.00 total the GST is exactly $5.00 — multiplying $105 by 5% would have given $5.25, which is 25 cents too much.

Common questions

Which provinces charge HST instead of GST?

Five. Ontario at 13%, Nova Scotia at 14%, and New Brunswick, Prince Edward Island and Newfoundland and Labrador at 15%. Everywhere else charges the 5% federal GST, sometimes next to a separate provincial tax such as BC's PST or Quebec's QST.

Do I have to charge GST/HST on my sales?

Generally only once your taxable sales pass $30,000 in a single calendar quarter, or across four consecutive quarters. Below that you are a small supplier and registering is optional — though registering early does let you claim input tax credits on what you buy.

Can I claim back the GST/HST I pay on business purchases?

If you are registered, yes — those are input tax credits. Two catches worth knowing: for any expense over $100 you need the supplier's GST/HST registration number on the receipt — and more detail again over $500 — while meals and entertainment are normally limited to 50%.