How do you calculate GST on Canadian invoices?

Multiply the net (pre-tax) amount by the GST/HST rate. Example at 5% GST: CA$1,000 × 0.05 = CA$50 tax, total CA$1,050. At 13% HST: CA$1,000 × 0.13 = CA$130, total CA$1,130. Show net, tax, and total separately on the invoice.

What GST/HST rate should I use in Canada?

Federal GST is 5%. HST combined rates are typically 13% (Ontario) or 15% (Nova Scotia, New Brunswick, Newfoundland). BC and other provinces may use GST + PST separately — enter your applicable combined rate.

How do I calculate 13% HST on an invoice?

HST amount = Net × 0.13. Gross = Net × 1.13. From a gross price: Net = Gross ÷ 1.13. Example: CA$500 net → CA$65 HST → CA$565 total.

What is GST tax invoice calculation?

Start with line-item subtotals, sum to a subtotal, multiply by your GST/HST rate for the tax line, then add for the total due. Our calculator and invoice generator do this automatically.

Can I use this as a free GST calculator for Canada?

Yes. Enter any net or gross CAD amount, set your rate (5%, 13%, 15%, etc.), and get instant GST/HST breakdown — then create a Canadian tax invoice free with InvoBuzz.

How to Calculate GST on Canadian Invoices (+ Free HST Calculator)

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Rate: 13% Currency: CAD (CA$) Reduced: 5% GST; provincial rates vary

How Canada HST / GST works

Canada uses federal GST (5%) plus provincial sales tax or a combined HST in participating provinces (e.g. 13% or 15% HST). Rates vary by province — Ontario HST is commonly 13%. This calculator uses a single combined percentage. Enter 5 for GST-only, 13 for typical Ontario HST, or your exact combined rate. Example at 13%: CA$100 net → CA$13 tax → CA$113 gross. After calculating, create a CAD invoice with the correct tax label in InvoBuzz.

How to calculate GST on Canadian invoices

1
Determine your applicable GST/HST rate
Federal GST is 5%. Ontario uses 13% HST; Nova Scotia uses 15% HST. Some provinces charge GST and PST separately — use the combined percentage on your invoice.
2
Calculate tax from a net (pre-tax) amount
Tax = Net × (Rate ÷ 100). Total = Net + Tax. Example (13% HST): CA$800 net → CA$104 tax → CA$904 gross.
3
Extract tax from a gross (tax-inclusive) amount
Net = Gross ÷ (1 + Rate/100). Tax = Gross − Net. Example: CA$904 gross at 13% → CA$800 net + CA$104 HST.
4
Apply tax to each line item on the invoice
Multiply quantity × unit price for each line, sum subtotals, then calculate GST/HST on the subtotal (or per line if required). Show subtotal, tax, and total clearly.
5
Include required fields on a Canadian tax invoice
Add your business name, GST/HST registration number, invoice number, date, client details, item descriptions, tax rate, tax amount, and total in CAD.

Reverse charge & inclusive prices

Canada generally does not use EU reverse charge, but specific imported taxable supply rules may apply. Confirm with the CRA for cross-border services.

Invoice requirements

Canadian invoices should show business name, invoice number/date, customer details, description, and GST/HST registration number when required, with tax amounts clearly stated.

Read our full guide: How to calculate GST on Canadian invoices

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