GST/HST Invoice Format in Canada: Complete Guide for Small Businesses

Getting the GST/HST invoice format right in Canada is essential for compliance with Canada Revenue Agency (CRA). An incorrectly formatted invoice can mean your clients can't claim input tax credits, and your business faces penalties during audits.

This guide explains the exact format requirements, walks through a calculation example, and shows you how to set up compliant invoices in minutes.

What Is a GST/HST Invoice?

A GST/HST invoice is a formal document that shows the GST/HST charged on a sale. It serves as proof of the transaction for both seller and buyer, and enables GST/HST-registered buyers to claim input tax credits from CRA.

A GST/HST invoice is a formal document that shows the GST/HST charged on a sale. It serves as proof of the transaction for both seller and buyer, and enables GST/HST-registered buyers to claim input tax credits from CRA.

Required Fields on a GST/HST Invoice

Every GST/HST invoice in Canada must clearly display:

Every GST/HST invoice in Canada must clearly display:

• The words "Tax Invoice" prominently displayed
• Seller's business name, address, and BN
• Buyer's name, address, and BN (for B2B)
• Invoice number (unique and sequential)
• Invoice date and tax point
• Line-item descriptions with quantities and unit prices
• Subtotal before GST/HST
• GST/HST rate applied: 5% GST (federal) + 0%–10% provincial (HST up to 15%)
• GST/HST amount
• Total payable including GST/HST

GST/HST Calculation Example

For a service worth C$10,000 in Canada:

For a service worth C$10,000 in Canada:

• Subtotal: C$10,000
• GST/HST (5% GST (federal) + 0%–10% provincial (HST up to 15%)): calculated on the subtotal
• Total: subtotal + GST/HST

Always show the GST/HST as a separate line item — never bundle it into the price without disclosure.

Common Format Mistakes

Common Format Mistakes includes: Missing "BN" — makes the invoice invalid for input credits Not labelling the document as "Tax Invoice"

• Missing "BN" — makes the invoice invalid for input credits
• Not labelling the document as "Tax Invoice"
• Using old GST/HST rates
• Bundling GST/HST into prices without a clear breakdown
• Non-sequential or duplicated invoice numbers

Free Templates for Canadian Businesses

Invoicemonk's invoice generator provides pre-built templates with all CRA-required fields. Select your country, add your BN, and the platform handles GST/HST calculations automatically.

Invoicemonk's invoice generator provides pre-built templates with all CRA-required fields. Select your country, add your BN, and the platform handles GST/HST calculations automatically.

Digital vs Paper Invoices

CRA accepts digital invoices provided they contain all mandatory elements and can be produced for audit. Canada is exploring Peppol adoption through the Digital Commerce Standards initiative.

CRA accepts digital invoices provided they contain all mandatory elements and can be produced for audit. Canada is exploring Peppol adoption through the Digital Commerce Standards initiative. While e-invoicing is not yet mandatory, CRA accepts and encourages electronic record keeping.

Using invoicing software ensures consistency and reduces errors compared to manual formatting.