Tools & Alternatives
How to Calculate GST on Canadian Invoices (HST/GST Guide)
A practical walkthrough of how to calculate GST on Canadian invoices—GST vs HST vs PST, simple formulas, freelancer examples, and when a free invoice tool helps without cloud lock-in.
Written from our experience building and maintaining client websites, custom platforms, and five LogicLitz products. Review our client work and editorial ownership.
Relevant for: Canada · Ontario · British Columbia · Alberta · Global
How to calculate GST on Canadian invoices—short answer
To calculate GST on a Canadian invoice: take the taxable line subtotal, multiply by the GST (or HST) rate for the place of supply, then add that tax to the subtotal for the total due. Example: $1,000 taxable × 5% GST = $50 tax → invoice total $1,050 (before any PST).
GST, HST, and PST—what goes on the invoice
- GST (Goods and Services Tax): federal 5% in provinces that do not use HST
- HST (Harmonized Sales Tax): combined federal + provincial rate in participating provinces (e.g. Ontario commonly 13%)
- PST/QST: separate provincial taxes in some provinces—may appear as their own line
- Place of supply usually follows where the buyer receives the service or goods under CRA rules
Freelancers and SMBs searching “how to calculate gst on canadian invoices” usually need a clear line for taxable amount, tax rate, tax amount, and total—plus their GST/HST number when registered.
Step-by-step calculation
- List taxable goods/services and unit prices (exclude tax)
- Sum the taxable subtotal
- Apply the correct GST or HST rate for the place of supply
- Tax amount = subtotal × rate
- Invoice total = subtotal + tax (+ separate PST if applicable)
- Show your business name, address, invoice number, date, and GST/HST registration number when required
Worked example (GST 5%): Design services $800 + hosting $200 = $1,000 subtotal. GST = $1,000 × 0.05 = $50. Total = $1,050.
Worked example (HST 13% Ontario-style): Same $1,000 subtotal × 0.13 = $130 HST. Total = $1,130.
Tools that help without forcing a cloud account
Spreadsheets work until reprint history and correction duplicates get messy. BillLitz is LogicLitz’s free GST & VAT–aware invoice generator—useful when you want PDFs and history without mandatory signup. For full offline GST books (India-focused), see LedgerLitz; for Canadian freelancers the invoice tool is usually enough to start.
Common mistakes
- Applying GST when HST applies (or the reverse)
- Taxing exempt lines the same as taxable lines
- Missing registration number on invoices when you are registered
- Overwriting invoice numbers instead of issuing a correction with a new number
LogicLitzFAQ
Questions, answered.
Straight answers about how we work, where we ship from, and what working with LogicLitz looks like.
Multiply the taxable subtotal by the applicable GST or HST rate, then add that tax to the subtotal. Example: $1,000 × 5% GST = $50 tax; total $1,050.
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Read guideNeed clean GST/VAT invoices without signup?
BillLitz by LogicLitz generates tax-aware invoices with history and PDF reprints—free for on-device use.