Reverse GST/HST/PST Calculator

Find the pre-tax price from a total that includes taxes. Select your province and enter the total amount to instantly calculate the pre-tax price.

Reverse GST/HST/PST Calculator

Calculate the pre-tax price from a total that includes all Canadian sales taxes. Works for all provinces and territories — GST, HST, PST, and Quebec's QST.

Calculation Mode
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Enter the total price including all taxes
Applies province-specific rules; pick your province in the calculator.Rules verified: October 25, 2026Inputs stay in your browser

Official sources

Limitations

  • Assumes the item is fully taxable; zero-rated and exempt goods (basic groceries, most medical devices, residential rent) are not handled.
  • Point-of-sale rebates and First Nations tax exemptions are not applied.

Results are estimates for general information and are not legal, tax, payroll or financial advice. Employment contracts, collective agreements and individual circumstances can change what you are owed.

Frequently Asked Questions

What is the difference between GST, HST, and PST?

GST (Goods and Services Tax) is a federal tax applied nationwide. PST (Provincial Sales Tax) is applied by some provinces. HST (Harmonized Sales Tax) combines GST and PST into a single rate and is used in several provinces including Ontario, Nova Scotia, and Newfoundland & Labrador.

Does this calculator work for Quebec QST?

Yes. Quebec uses QST (Quebec Sales Tax) instead of PST. This calculator supports Quebec and accounts for its unique QST rate.

How do I use the reverse calculator?

Enter the total price you paid (including tax) and select your province. The calculator will automatically subtract the tax and show you the pre-tax price.

Can I use this calculator in forward mode?

Yes. You can enter a pre-tax price and select your province to calculate the total including tax. Toggle between reverse and forward modes as needed.

Are the tax rates current?

Yes, we update our tax rates regularly to match current federal and provincial rates. However, always verify critical calculations with official CRA or provincial government resources.