How to add HST in Ontario
In Ontario, HST is 13%. To add it, multiply the price by 0.13 and add that to the price — or multiply by 1.13. $1,000 of work is $130 HST, $1,130 total.
Reverse HST calculator: take 13% out of a total
If a total already includes 13% HST, divide it by 1.13 to get the price before tax. $1,130 ÷ 1.13 = $1,000, so the HST is $130.
GST and HST rates by province (2026)
::rates Source: Canada Revenue Agency, GST/HST rates by province.
Which rate goes on my invoice?
Usually the rate of the province where the work is done. Work on a house in Barrie is Ontario, 13%. If you work across provincial lines, check the CRA place-of-supply rules or ask your bookkeeper.
Do I have to charge HST at all?
Not always — if your taxable sales stay under $30,000 over four calendar quarters in a row, you can be a small supplier. The $30,000 rule, explained →
Need the invoice too?
Put the amount into our free HST invoice generator — your business, your client, the work, PDF in two minutes.
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