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.

Canada Working Days

Calculate Canadian GST, HST, or PST by province — instantly shows net, tax amount, and gross total for invoicing and filing.

GST/HST returnsExpense receiptsFreelance invoicingBookkeepingInvoice preparation
Example: CA$5,000 net + 13% HST (Ontario) = CA$5,650 gross · CA$650 HST

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. 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. 2

    Enter the amount

    Type the price in Canadian dollars (CAD). The calculation works for any value.

  3. 3

    Click Calculate

    The result shows the net amount, federal GST at 5%, and the GST-inclusive total.

  4. 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%.

Frequently Asked Questions

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Next Steps

What to do next

Calculate your gross margin

Find the gross profit margin on your GST-exclusive cost and sell price.

Set invoice due dates

Calculate payment due dates from Net 30, 60, or 90 terms.

Count Canadian working days

Count business days in Canada with federal statutory holidays excluded.

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Need import duty rates?

This calculator handles Canadian GST/HST/PST only. For import duty with HS code lookup (source-assisted for Canada, 10 markets total), use the HS Code Duty Calculator. For full landed cost, see the Landed Cost Calculator.