Tax and CRA deadlines
GST/HST calculator, by province
Add sales tax to a price, or pull it back out of a total — any province.
A starting point, not tax advice. Nothing you type leaves your browser.
Keep in mind. The rate follows the place of supply, and some supplies are zero-rated or exempt. Provincial sales tax has its own rules about what it applies to, and registering for it is separate from registering with the CRA.
How this works
What the number means
Which rate applies depends on where the sale is made. Ontario, the Atlantic provinces and Nova Scotia charge a single harmonized sales tax (HST) of 13% to 15%. Everywhere else the CRA collects 5% GST, and British Columbia, Manitoba, Saskatchewan and Quebec add their own provincial sales tax, administered separately by the province.
Adding tax is multiplication. Taking it back out of a total is where people slip, because the rate applied to the total is not the tax inside it. You divide by one plus the rate to get the pre-tax amount, then subtract.
Worked example. In Ontario a $500 invoice becomes $565.00 with 13% HST. Going the other way, a $565.00 total contains $500.00 of work and $65.00 of HST — not $73.45.
Sources
- CRA — Charge and collect the GST/HST: which rate to charge — modified 8 April 2026
Rates change. The CRA page is the authority, and these are reviewed every January.
Questions
When do I have to register for GST/HST?
Once your taxable revenue passes $30,000 over four consecutive calendar quarters. If you pass $30,000 within a single quarter, you must register within 29 days of the sale that took you over. The CRA sets both rules.
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