Free tool · GST/HST
GST/HST calculator and reverse HST calculator (Ontario 13%)
Use the calculator to add 13% Ontario HST to a price, or switch to the reverse HST calculator to take HST out of a tax-included total and find the pre-tax amount. Ontario is selected to start; every other province and territory is in the list.
An illustration of a price splitting into GST and provincial HST, not your result.
Visual labels: Pre-tax amount; Federal GST; Provincial HST.Your scenario
Amounts are displayed in CAD. The rate follows the province or territory where the supply is made.
- Pre-tax amount
- $1,000.00
- HST (13%)
- $130.00
- Federal part (5%)
- $50.00
- Provincial part (8%)
- $80.00
- Total with tax
- $1,130.00
PST, RST and QST are separate taxes and are not included here.
Calculated on this device. These inputs are not submitted to Sora.
How the calculation works
Reverse HST (tax-included to pre-tax): pre-tax amount = total ÷ 1.13 in Ontario, and HST = total − pre-tax amount. Do not multiply the total by 13%: that takes 13% of an amount that already contains the tax and overstates it. In general, pre-tax amount = total ÷ (1 + rate). Adding tax: total = pre-tax amount × (1 + rate). In an HST province the rate is the federal 5% plus the provincial part: 8% in Ontario, 9% in Nova Scotia and 10% in New Brunswick, Newfoundland and Labrador and Prince Edward Island. Elsewhere only the 5% GST applies. Amounts are rounded to the cent.
A worked example
At an illustrative $1,130 receipt that includes Ontario HST, the pre-tax amount is $1,130 ÷ 1.13 = $1,000 and the HST is $130. Multiplying $1,130 by 13% instead would give $146.90, which is wrong. Going the other way, $1,000 before tax plus 13% HST ($130, made up of $50 federal and $80 provincial) is $1,130. In Nova Scotia the same $1,000 carries 14% HST, or $140, since the provincial part fell to 9% on April 1, 2025.
GST/HST rates by province and territory
The rate follows the province or territory where the supply is made. To reverse a tax-included amount, divide it by the number in the last column.
| Province or territory | Federal GST | Provincial HST | Combined | Reverse: divide by |
|---|---|---|---|---|
| Alberta | 5% | None (GST only) | 5% | 1.05 |
| British ColumbiaPST is separate and not included | 5% | None (GST only) | 5% | 1.05 |
| ManitobaRST is separate and not included | 5% | None (GST only) | 5% | 1.05 |
| New Brunswick | 5% | 10% | 15% | 1.15 |
| Newfoundland and Labrador | 5% | 10% | 15% | 1.15 |
| Northwest Territories | 5% | None (GST only) | 5% | 1.05 |
| Nova Scotia | 5% | 9% | 14% | 1.14 |
| Nunavut | 5% | None (GST only) | 5% | 1.05 |
| Ontario | 5% | 8% | 13% | 1.13 |
| Prince Edward Island | 5% | 10% | 15% | 1.15 |
| QuebecQST is separate and not included | 5% | None (GST only) | 5% | 1.05 |
| SaskatchewanPST is separate and not included | 5% | None (GST only) | 5% | 1.05 |
| Yukon | 5% | None (GST only) | 5% | 1.05 |
Assumptions and limits
PST, RST and QST are separate taxes and are not included. If you sell in British Columbia, Manitoba, Saskatchewan or Quebec, the GST shown here is only part of what the customer pays. The tool assumes a fully taxable supply: zero-rated and exempt supplies, tax-paid-by-recipient situations and special rules are not modelled. The federal and provincial split is for understanding the rate; on an invoice for an HST province, show the total HST rate. Place of supply rules decide which rate applies, so confirm yours before charging.
General educational information. Inputs stay on this device and are not submitted. Confirm the assumptions before using a result in a business decision.
Source and further reading
Rates checked October 24, 2026 against the CRA pages: CRA GST/HST calculator and rates by province; CRA: charge and collect the GST/HST. The examples above use Sora’s own illustrative figures.
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