Start with the tax-included total
Use the final amount paid or charged after the general sales taxes were added.
Free · tax-included total to pre-tax price
Reverse HST calculator for Canada: find the price before tax.
Enter a tax-included Canadian total, choose the province or territory, and estimate the original subtotal plus the GST, HST, PST, QST, or RST already inside it. The amount stays in your browser.
13
One amount. Every Canadian jurisdiction.
Choose a province or territory to see the subtotal, separate tax lines, total tax, and final total.
Worked reverse examples
What a C$100 pre-tax price looks like inside each total.
These examples start with a fully taxable C$100 subtotal, add the selected jurisdiction’s general tax, then reverse the final amount back to C$100.
| Province or territory | Tax-included total | Estimated pre-tax price | Tax inside the total | Displayed tax lines |
|---|---|---|---|---|
| Ontario | $113.00 | $100.00 | $13.00 | HST $13.00 |
| Nova Scotia | $114.00 | $100.00 | $14.00 | HST $14.00 |
| Quebec | $114.98 | $100.00 | $14.98 | GST $5.00 + QST $9.98 |
| British Columbia | $112.00 | $100.00 | $12.00 | GST $5.00 + PST $7.00 |
| Alberta | $105.00 | $100.00 | $5.00 | GST $5.00 |
Reverse-tax formula
Divide by the tax factor—do not subtract the rate.
A tax rate is a percentage of the pre-tax price, not of the final total. That is why simply subtracting 13% from an Ontario total gives the wrong base.
Divide by 1 plus the combined rate
For Ontario, C$113 ÷ 1.13 = C$100. For Québec, C$114.98 ÷ 1.14975 is approximately C$100.
Rebuild and reconcile each tax line
The calculator rounds the subtotal and each displayed tax to cents, then reconciles any final cent to the exact total entered.
Quick divisor table
General reverse-tax factors for all 13 jurisdictions.
For an ordinary fully taxable amount, divide the tax-included total by the factor shown. Product-specific taxability and provincial rules can change the correct treatment.
| Province or territory | General tax system | Combined rate | Divide total by |
|---|---|---|---|
| Alberta AB | GST | 5% | 1.05 |
| British Columbia BC | GST + PST | 12% | 1.12 |
| Manitoba MB | GST + RST | 12% | 1.12 |
| New Brunswick NB | HST | 15% | 1.15 |
| Newfoundland and Labrador NL | HST | 15% | 1.15 |
| Northwest Territories NT | GST | 5% | 1.05 |
| Nova Scotia NS | HST | 14% | 1.14 |
| Nunavut NU | GST | 5% | 1.05 |
| Ontario ON | HST | 13% | 1.13 |
| Prince Edward Island PE | HST | 15% | 1.15 |
| Quebec QC | GST + QST | 14.975% | 1.14975 |
| Saskatchewan SK | GST + PST | 11% | 1.11 |
| Yukon YT | GST | 5% | 1.05 |
Know what the arithmetic cannot decide
A correct reverse calculation can still use the wrong rate.
This page assumes the selected jurisdiction’s current general rate applies to the whole amount. It does not determine taxability, place of supply, exemptions, zero-rating, point-of-sale rebates, special rates, registration, input tax credits, or provincial collection duties. A receipt may also differ by a cent because of item-level or register rounding.
Common reverse-tax questions
Five answers before you rely on a tax-included total.
How do I reverse 13% HST in Ontario?
Divide the tax-included total by 1.13. For example, C$113 divided by 1.13 is C$100 before HST, leaving C$13 of HST inside the total.
Why is subtracting 13% from the total wrong?
The 13% HST was calculated from the smaller pre-tax amount. Subtracting 13% of C$113 produces C$98.31, while dividing C$113 by 1.13 correctly returns C$100.
How do I remove GST and QST from a Québec total?
For a fully taxable amount at the general rates, divide the total by 1.14975. Revenu Québec states that 5% GST and 9.975% QST are each calculated on the selling price excluding GST.
Why can my receipt differ by one cent?
A register may round each item or tax line before adding the receipt. This calculator reverses one final total, rounds to cents, and reconciles the displayed components to the amount entered.
Can I use this result to file a GST/HST or provincial return?
Use it as an educational estimate and arithmetic check. Filing requires the actual invoice or receipt, the correct tax treatment, eligible input tax credit evidence, and the applicable federal and provincial rules.
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