GST/HST Calculator (Canada)

What the GST/HST calculator does

Every province and territory charges the 5% federal Goods and Services Tax, and several provinces have merged their own sales tax with it into a single Harmonized Sales Tax. The calculator adds GST or HST to a base price to find what a customer pays, or removes it from a tax-inclusive total to recover the base and the tax.

Pick the province or territory, enter an amount, and choose whether it includes tax. The separate provincial taxes in British Columbia, Saskatchewan, Manitoba and Quebec are handled by the PST and QST calculators.

GST and HST: one system, two forms

• HST provinces combine the federal and provincial portions into one rate, shown as a single tax line.
• Alberta and the three territories charge only the 5% GST, with no provincial or territorial sales tax.
• British Columbia, Saskatchewan, Manitoba and Quebec charge the 5% GST plus their own tax as a separate line; this calculator shows the GST part.

The rates by province and territory

• Ontario: 13% HST
• Nova Scotia: 14% HST
• New Brunswick, Newfoundland and Labrador, Prince Edward Island: 15% HST
• Alberta, Northwest Territories, Nunavut, Yukon: 5% GST
• British Columbia, Manitoba, Saskatchewan, Quebec: 5% GST here, with the provincial tax added separately

These come from the CRA schedule of GST/HST rates. Nova Scotia’s rate fell to 14% in 2025, which is reflected here.

Adding tax versus removing tax

To add tax, multiply the base amount by one plus the rate. To remove it, divide the tax-inclusive total by one plus the rate to get the base, and the difference is the tax. Because the tax was charged on the smaller base, subtracting the percentage from the total overstates the base and understates the tax, a common manual error.

The rate is used as a decimal, so 13% HST is 0.13.

A worked example

An item priced at $100 before tax in Ontario attracts 13% HST of $13.00, for a total of $113.00. Working back, $113.00 divided by 1.13 gives $100.00, and the $13.00 difference is the HST.

In Alberta the same $100 attracts $5.00 of GST, for $105.00. In New Brunswick the 15% HST makes it $115.00, and $115.00 / 1.15 returns the $100.00 base. The same goods cost $10 more in New Brunswick than in Alberta purely because of the sales tax.

When to use it

• Pricing a product so the tax-inclusive total shown to customers is right
• Backing the tax out of a receipt for records or an expense claim
• Checking the tax line on a supplier invoice in an HST province
• Comparing the total cost of the same purchase across provinces

Common mistakes and planning tips

Removing tax by subtracting the percentage instead of dividing by one plus the rate is the most frequent error. Treating every supply as fully taxable is another: basic groceries, many medical devices and certain exports are zero-rated, and some supplies are exempt. A business registered for GST/HST can usually claim input tax credits, so the tax it pays on inputs is not a final cost. If you collect the tax, you remit it on your GST/HST return through the CRA’s My Business Account; CRA guide RC4022 covers the general rules.

Assumptions and limits

The calculator is exact for the rate of the province you choose. It covers GST and HST only, not PST or QST, and assumes the item is fully taxable at the standard rate; zero-rated and exempt supplies and point-of-sale rebates are not modelled. Rates can change, so confirm the rate and the taxability of the specific supply with the CRA before filing.

This is general information, not financial advice.

About This GST HST Calculator

Use this GST HST calculator to get an instant, accurate estimate. The figures follow official CRA guidance and every rate and threshold is kept up to date for 2026. Adjust the inputs above to match your situation, or browse all our calculators to plan your next step.