Canada GST Calculator
Calculate Canadian federal GST at the standard 5% rate. Covers GST-only provinces and includes reference rates for HST provinces (Ontario 13%, Nova Scotia 15%) and PST provinces.
Calculate Canadian GST, HST, or PST by province — instantly shows net, tax amount, and gross total for invoicing and filing.
Formula
Add GST: Gross = Net × 1.05 | Remove GST: Net = Gross ÷ 1.05
Canada's federal GST at 5% uses the same arithmetic as other GST and VAT systems. Multiply the net price by 1.05 to get the GST-inclusive price. To extract the net from a GST-inclusive amount, divide by 1.05. The GST component is always 1/21 of the GST-inclusive price — a useful quick check.
Worked Example
Scenario: A Vancouver-based consultant invoices a client CAD 4,000 for professional services. Federal GST at 5% applies (British Columbia charges GST + PST separately; this example covers GST only).
GST = CAD 4,000 × 5% = CAD 200.00
Gross = CAD 4,000 + CAD 200 = CAD 4,200.00
In British Columbia, provincial PST of 7% would also apply to most services, bringing the total tax to 12% (5% GST + 7% PST). Always apply the correct provincial tax on top of GST for your province.
Common Mistakes
- Applying only federal GST in HST provinces. Ontario, Nova Scotia, New Brunswick, PEI, and Newfoundland & Labrador use a Harmonised Sales Tax (HST) where the provincial component is collected alongside the federal GST as a single amount. In Ontario the HST is 13% (not 5%). Using 5% in these provinces will significantly understate the tax owing.
- Confusing GST registration thresholds. Canadian businesses with annual taxable supplies exceeding CAD 30,000 must register for GST/HST. Small suppliers below this threshold are not required to register or charge GST. Charging GST without being registered, or failing to register when required, both carry penalties from the CRA.
- Forgetting that some supplies are zero-rated or exempt. Basic groceries, prescription drugs, and most medical devices are zero-rated (0% GST). Financial services and residential rent are exempt (no GST, no input tax credit). These categories are distinct — zero-rated suppliers can still claim input tax credits; exempt suppliers cannot.
Guide
How to Use
- 1
Choose Add or Remove
Select Add GST to calculate the GST-inclusive price from a net amount, or Remove GST to extract the net from a gross price.
- 2
Enter the amount
Type the price in Canadian dollars (CAD). The calculation works for any value.
- 3
Click Calculate
The result shows the net amount, federal GST at 5%, and the GST-inclusive total.
- 4
Add provincial tax if needed
For HST provinces, use the combined rate (e.g. 13% in Ontario, 15% in Nova Scotia) instead of 5%.
FAQ
Frequently Asked Questions
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