Practical guide · stated assumptions and checkable examples
Canadian sales tax: compare ordinary rates, not every transaction
Published · Sources checked
Source and worked-example review; not professional advice or approval. Examples are synthetic unless explicitly identified otherwise. Follow the cited authority for current eligibility and legal requirements.
Canada does not have one retail sales-tax percentage for every province and every purchase. A useful comparison must first specify the place-of-supply rules and whether the particular item is taxable at the ordinary rate. The arithmetic starts only after those facts are established.
The reference scenario is deliberately narrow
For an ordinary fully taxable $100 pre-tax sale in the applicable province, the reviewed CRA table gives Ontario 13% HST, Nova Scotia 14% HST and Alberta 5% GST. Nova Scotia’s 14% rate took effect on April 1, 2025; it is not a change newly effective in September 2026. These examples are not rules for exempt or zero-rated supplies.
References: CRA — GST/HST and provincial rate calculator
Keep federal and provincial components visible
Using the same $100 ordinary-taxable base, the general combined Quebec reference is 5% GST plus 9.975% provincial tax, giving $14.975 tax before monetary rounding and $114.975 gross. A displayed gross total would normally be expressed to cents, but the calculation should retain enough precision before the final rounding. Selecting a province does not establish that both taxes apply to the item.
Extracting included tax is a division
At a combined rate r, pre-tax amount is gross / (1 + r). A $113 tax-inclusive amount at 13% has a $100 base and $13 tax. Subtracting 13% of $113 would remove $14.69 and produce the wrong base. In the calculator, choose the inclusive-price mode before entering the gross amount.
Calculation: Pre-tax amount = tax-inclusive price / (1 + combined rate); included tax = gross − pre-tax amount
A percentage-point change has a defined base
On a fixed $100 pre-tax price, the difference between 13% and 14% is $1. It does not imply the retailer’s displayed price will change by exactly 1%, because price-setting and rounding are separate from the tax arithmetic. Keep the pre-tax amount constant when comparing rates, and keep the actual transaction’s tax date with the result.
Do not confuse sales tax with income tax
This comparison is about transaction taxes, not the federal or provincial tax on a person’s annual income. CRA and Revenu Québec publish income-tax schedules separately. A calculator that multiplies a sale amount by a general combined sales-tax rate does not assess income tax, business deductions, input-tax credits or registration obligations.
References: CRA — 2026 federal and provincial income tax rates; Revenu Québec — Personal income tax rates
| Province | General combined rate | Tax on $100 before cent rounding |
|---|---|---|
| Alberta | 5% | $5.00 |
| Ontario | 13% | $13.00 |
| Nova Scotia | 14% | $14.00 |
| Quebec | 14.975% | $14.975 |
Questions about this guide
Does province selection establish the correct rate for a delivery?
Not by itself. The applicable supply and transaction rules must be checked. The calculator applies the selected reference or entered rate; it does not decide the legal location of a sale.
Can I remove included tax by multiplying the gross by the tax rate?
No. Divide the gross by one plus the rate to obtain the base, then subtract. Multiplication by the rate is used when the amount entered is already pre-tax.
Primary sources and reference dates
- CRA — GST/HST and provincial rate calculator — checked .
- CRA — 2026 federal and provincial income tax rates — checked .
- Revenu Québec — Personal income tax rates — checked .