Discount Calculator
🇨🇦 Canada version
In Canada the tag price excludes tax, and the province decides how much is added at the till. This calculator applies each discount first and then adds the combined GST, HST, PST or QST for the province you pick, showing the amount payable and what you saved against the taxed original price.
Use Discount Calculator online
Discount Calculator
Stack discounts in the order a till applies them, work backwards from a sale price, convert any multi-buy into a real percentage, and compare pack sizes on unit price.
Price and discounts
HST 13% (5% federal + 8% provincial).
GST/HST is added on top of the discounted price at the till. Canadian shelf prices normally exclude tax; pick your province for the combined rate.
Each discount comes off the price left after the one before it, not off the original. The gap is 6% — $7.2 on this item.
Step by step
| Step | From | Taken off | Leaves |
|---|---|---|---|
| Sale | $120 | −$36 | $84 |
| Extra code | $84 | −$16.8 | $67.2 |
GST/HST added at the till
Work backwards
Useful for checking a claimed "was" price. Divide by (1 − rate), never multiply by (1 + rate) — that is a different and smaller number.
Canada rules and figures
- GST is 5% across Canada, and participating provinces charge HST instead.
- British Columbia, Manitoba, Saskatchewan and Quebec add a separate provincial tax: PST of 7% in British Columbia, RST of 7% in Manitoba, PST of 6% in Saskatchewan and QST of 9.975% in Quebec.
- HST is 13% in Ontario, 14% in Nova Scotia and 15% in New Brunswick, Newfoundland and Labrador and Prince Edward Island.
- Alberta, the Northwest Territories, Nunavut and Yukon charge GST of 5% only.
- The rates shown apply on or after 1 April 2025, from the CRA GST/HST rates page.
Sources: CRA: GST/HST calculator (and rates) (checked 2026-11-08)
How the discount calculator works
Discounts are chained on the pre-tax price, and tax is then added to the result. The province menu fills in the combined rate, so the same discounted price pays a different total in each province.
payable = final × (1 + province rate); tax = final × province rate; saving = original × (1 + rate) − payable
- The menu is titled Province or territory and starts on Ontario at 13%.
- Price includes starts off, because Canadian prices are normally quoted before tax.
- Alberta, the Northwest Territories, Nunavut and Yukon show 5%; New Brunswick, Newfoundland and Labrador and Prince Edward Island show 15% HST.
- The rate field can be edited by hand if a particular item is taxed differently.
- Quebec is listed at 14.975%, the combined GST of 5% and QST of 9.975%.
How to use the discount calculator
- Enter the original price. Type the shelf price, a quantity and a currency symbol of up to three characters.
- Add discounts in order. Each row has a label, a value and a switch between percent and a fixed amount. The numbers show the order they are applied in.
- Set the tax treatment. Enter a rate and say whether the price already includes it. The tax card shows the net price, the tax and the amount payable. Where a country has several rates, a menu above the field lists them.
- Work backwards from a sale price. Enter what you paid and the advertised percentage to see the original price that figure implies.
- Compare multi-buys and pack sizes. Use the deals tab with the price of one item, then the unit-price tab to compare packs on cost per unit.
Example: $200.00 with 40% off, then 10% off, in three provinces
Taking 40% off $200.00 gives $120.00, and the second 10% gives $108.00; that is $92.00 off, or 46% instead of 50%. Tax is then added: Alberta at 5% brings the payable amount to $113.40, British Columbia at 12% to $120.96, and Quebec at 14.975% to $124.17. In Ontario at 13% it is $122.04.
When to use the discount calculator
- Pricing a sale for another province. Pick the province and see the total after its tax, not your own.
- Checking an online order. Enter the discounted price and the delivery province to confirm the amount payable.
- Comparing a coupon with a clearance tag. Stack both orders and read which leaves the lower payable total.
- Unit prices at a grocery store. Use the unit-price tab to see which pack costs least per unit.
What the discount calculator does not do
- One combined rate applies to the whole price, although some goods are zero-rated or taxed differently.
- Quebec tax is shown as a single combined rate, and QST is not separated from GST.
- Quantity multiplies the per-item result, so a basket coupon should use a quantity of 1.
- Sums are unrounded, shown to two decimals.
- No exchange rate is applied, so the symbol changes the label alone.
When something else is a better fit
- When you need a percentage that is not a discount, use the Percentage Calculator.
- When you are working out income tax in a province, use the Tax Calculator.
- When you need the official rate for a supply, use the CRA GST/HST calculator and rates page.
Questions about the discount calculator
Is tax included in Canadian prices?
Not usually. Tag prices exclude tax, and GST, HST, PST or QST is added at the till, which is why the switch starts off.
How much tax would I pay in Ontario?
At 13% HST, a $108.00 price carries $14.04 of tax, so $122.04 is payable.
Why does the same price cost more in Quebec?
Quebec combines GST of 5% and QST of 9.975%, 14.975% in all. On $108.00 that is $16.17, against $5.40 in Alberta.
Are two discounts added together?
No. 40% then 10% is 46% off $200.00, not 50%, because the second applies to $120.00.
Can I edit the tax rate?
Yes. The menu sets the rate for a province, and the rate field beneath it can be typed over.