Contractor Invoice Template for Canada: CRA Rules

A compliant invoice template for contractors in Canada must display your legal business name, invoice date, unique invoice number, a description of the work completed, and your 9-digit Business Number with the RT program identifier if you collect GST/HST. In Alberta, a proper invoice under the Prompt Payment and Construction Lien Act must also identify the contract authority, state whether the bill is a progress claim, show statutory holdbacks, and cite testing or inspection approvals when required.

Essential Fields for Canadian Contractor Invoices

General contractors, specialty trades, and independent consultants cannot use a generic receipt template. The Canada Revenue Agency (CRA) sets explicit documentary requirements under the Excise Tax Act for any business charging Goods and Services Tax (GST) or Harmonized Sales Tax (HST). When you bill over $150, the CRA demands specific information so your commercial clients can claim their Input Tax Credits (ITCs). If your invoice lacks these details, your client's accounting department will reject the invoice or risk an audit penalty.

Every Canadian contractor billing document requires these core fields:

• Supplier Identification: Your registered business name or operating name, address, telephone number, and email.
• CRA Business Number: Your 9-digit business registration number followed by RT0001 (e.g., 123456789 RT 0001). This confirms you are registered to collect federal tax.
• Recipient Details: The client's legal name, site address, and billing address.
• Invoice Metadata: A unique, sequential invoice number, the invoice issue date, and payment terms (e.g., Net 28 days to match provincial prompt payment statutes).
• Clear Scope Description: An itemized breakdown of labour, materials, equipment rentals, or milestone deliverables. Broad descriptions like "services rendered" fail both CRA audits and prompt payment standards.
• Tax Breakdown: Explicit line items showing the applicable GST, HST, or Provincial Sales Tax (PST/QST). Never lump sales tax into a single unitemized total.
• Holdback Deduction: If working under a provincial lien statute, display the statutory holdback clearly deducted before arriving at the net amount due.

CRA Invoicing Thresholds

The CRA categorizes invoicing requirements across three distinct transaction tiers under GST/HST memoranda:

Invoice Total	Mandatory CRA Invoicing Elements	Input Tax Credit Eligibility
Under $30.00	Supplier name, date of invoice, and total amount payable.	Eligible with minimal proof of payment.
$30.00 to $149.99	Supplier name, date, total amount paid or payable, explicit tax charged or a statement that GST/HST is included, and your 9-digit CRA Business Number.	Eligible if the business number is verified.
$150.00 and above	All previous fields, plus the recipient's name, terms of payment, and a detailed description of each item or service provided.	Mandatory for commercial clients claiming ITCs.

For independent trades billing hourly or per project, see our practical guide on How to Invoice as an Electrician in Canada for trade-specific scopes and safety authority permit referencing.

Provincial Tax and Statutory Holdback Frameworks

Invoicing across provincial borders requires matching the destination province's tax regime. Place of supply rules dictate that you charge the sales tax rate of the province where the property is located or where the service is delivered, rather than where your office sits.

Province / Territory	Tax Type	Federal Rate	Provincial Rate	Total Combined Rate
Alberta, Northwest Territories, Nunavut, Yukon	GST	5%	0%	5%
British Columbia	GST + PST	5%	7%	12%
Saskatchewan	GST + PST	5%	6%	11%
Manitoba	GST + PST	5%	7%	12%
Ontario	HST	—	—	13%
Quebec	GST + QST	5%	9.975%	14.975%
New Brunswick, Newfoundland, Nova Scotia, PEI	HST	—	—	15%

Holdback Rules Under Construction Lien Legislation

In commercial and residential construction, statutory lien holdbacks protect subtrades, suppliers, and workers down the contractual chain. In Alberta, the Prompt Payment and Construction Lien Act (PPCLA) governs this process. Owners and general contractors must retain 10% from every progress payment made to a contractor. This money sits in a separate holdback account until lien periods expire.

A contractor invoice must document this arithmetic cleanly. If you fail to separate the base contract, the holdback, and the applicable sales tax, your invoice will create disputes between project accountants, quantity surveyors, and lending institutions.

How to Bill a Milestone: Worked Progress Billing Example

Consider a mechanical contractor in Calgary billing an owner for the second milestone on a commercial ventilation upgrade. The milestone value completed during this billing period is $10,000.00 CAD.

Under the Alberta PPCLA, the invoice must reflect the 10% statutory lien holdback. In Canada, GST applies to the full value of the service delivered ($10,000.00), not the net amount after holdback. The calculation unfolds as follows:

• Base Completed Work (Milestone 2): $10,000.00
• Less 10% PPCLA Statutory Holdback: -$1,000.00
• Subtotal Payable Before Tax: $9,000.00
• 5% GST (calculated on full $10,000.00 base value): $500.00
• Total Amount Due for Billing Period: $9,500.00
• Cumulative Retained Holdback to Date: $1,000.00

The contractor collects $9,500.00 today. The $1,000.00 holdback becomes billable through a separate holdback release invoice once the project reaches substantial performance and the statutory 60-day lien registration period lapses with no registered liens.

Field Notes: Avoiding Invoice Rejections in Canada

Billing errors cost contractors weeks of cash flow. Construction owners and general contractors routinely dispute invoices for administrative defects to preserve their own working capital. Watch for these common operational traps:

1. Omitting the PPCLA "Proper Invoice" Label: Under Alberta law, your payment clock (28 calendar days for the owner to pay) only begins when you serve a formal "proper invoice." If your invoice lacks the contract reference, purchase order (PO) number, or testing certificates agreed to in the prime contract, the owner has 10 days to deliver a formal Notice of Dispute.
2. Miscalculating Tax on Holdbacks: Many small contractors subtract the holdback and then apply 5% GST to the net remaining balance ($9,000 × 5% = $450). This violates CRA Excise Tax Act rules. The CRA treats the full $10,000 as consideration earned during the reporting period, meaning you must remit $500 in GST. Calculating tax on the net shortchanges the CRA and creates reconciliation headaches for the client's accounting department.
3. Missing Permit and Inspection Tracking: Municipal trade permits (such as electrical, plumbing, or building permits issued by the City of Calgary or Edmonton) should be listed on milestone billings. Institutional clients frequently withhold progress disbursements until trade inspection release reports match the line items on the claim.
4. Poor Record Retention: The CRA requires you to maintain all supporting books, receipts, and invoices for six years from the end of the last tax year to which they relate. Store both your issued invoices and payment confirmations digitally in off-site or cloud storage.

Using BoltBill Pro for Canadian Contractor Billing

Instead of wrestling with manual spreadsheets where a broken formula ruins your holdback calculations or misapplies provincial sales tax, professional billing tools automate compliance. Review our straightforward pricing to see how our platform handles progress billing, statutory holdback tracking, and CRA-compliant layouts out of the box.

Whether you run an engineering consultancy, an electrical shop, or an independent project management firm, BoltBill Pro produces audit-ready Canadian invoices that keep your cash flow moving and protect your lien rights under provincial law.