A typed PDF invoice gets paid faster than a handwritten one. An invoice with a due date gets paid faster than one without. An invoice with a clear "how to pay" section gets paid faster than one that makes the customer guess. None of this is theory — it's what happens every day in the field. This guide covers the parts.

What every professional invoice must contain

The Canada Revenue Agency has specific requirements for invoices when you're GST/HST-registered. Beyond that, there are practical requirements customers expect. Here's the combined list:

The header (top of page)

Your business name (clearly the most prominent thing)
Your logo, if you have one
Your business address
Your phone, email, and website
Your GST/HST registration number (required if registered)

Document identifiers

The word INVOICE — large and unmistakable
Invoice number (e.g., INV-2026-0142)
Issue date
Due date (e.g., "Due May 30, 2026" or "Net 14")
Reference to the original estimate number, if applicable
PO number, if your customer provided one

The customer block

"Bill To:" with customer's legal business name and address
Customer contact name (the AP person if you know it)
"Ship To:" if different

The line items

One row per item or service: description, quantity, unit price, line total
Subtotal (sum of line totals)
Each applicable tax on its own line (GST, HST, PST, or QST)
Grand total in bold
Amount in CAD (or whatever currency)

Payment instructions

Accepted methods: e-Transfer, cheque, credit card, etc.
Where to send payment (email for e-Transfer, mailing address for cheque)
Reference what to put in the payment memo (e.g., "Please include INV-2026-0142")

Terms (small print at bottom)

Late fee policy (e.g., "1.5% per month on balances over 15 days")
Thanks line ("Thank you for your business")

Formatting that looks professional

The fastest visual cues that separate amateur invoices from professional ones:

One typeface. Pick a single readable font (any decent sans-serif works). Don't mix Times New Roman with Arial with Calibri.
Right-aligned numbers. All dollar amounts in a column should be right-aligned, with consistent decimal places.
Plenty of white space. Tight margins look cramped and amateur. Give the page room to breathe.
One accent colour, used sparingly. Use your brand colour for the invoice header bar and the grand total line. Everything else stays black on white.
No clip art. No emoji. No "thank you for your business!!!" with three exclamation marks. Restraint signals professionalism.

Save it as a real PDF — not a scan of a PDF

If you're typing up an invoice in Word or Excel and then printing, scanning, and emailing the result — stop. Scanned PDFs are blurry, large, and a sign that the sender isn't comfortable with software. Word and Excel both export to PDF directly (File → Save As → PDF). Better still, use a tool that generates the PDF natively from your invoice data — it'll look sharper, be smaller, and be searchable for your customer.

The email pattern that gets you paid

A great PDF in a bad email still gets ignored. Use this subject line pattern:

Subject: Invoice INV-2026-0142 from [Your Business] — $5,650 due May 30

The number, the dollar amount, and the due date in the subject line massively increase the chance the email gets opened and forwarded to the AP department. Don't bury the lead.

And in the email body, keep it short:

Hi [First Name],

Attached is invoice INV-2026-0142 for the bathroom reno completed May 12 — total $5,650 CAD, due May 30, 2026.

Payment options are in the invoice (e-Transfer is fastest). Let me know if anything looks off or if your AP team needs additional documentation.

Thanks,
[Your Name]

The follow-up cadence that works

Most unpaid invoices aren't malicious — they're just lost in someone's inbox. A polite follow-up cadence:

Day 7 after sending: "Just confirming you received this — anything you need from me?"
Day 1 after due date: "Friendly reminder this is now due. Let me know if you need a new copy or have any questions."
Day 15 after due date: "Following up — this is now 15 days past due. As noted on the invoice, a 1.5% late fee will be added."
Day 30 after due date: Phone call. Email at this point isn't getting through.

Most invoices that are going to be paid voluntarily get paid by step 2 or 3. The phone call at day 30 is for the small percentage that need a human conversation.

What goes wrong (and how to avoid it)

Invoice goes to the wrong email. Many businesses have a dedicated AP email — accounts@customer.com or ap@customer.com. Ask before sending the first invoice; from then on, send straight to AP.
PDF won't open on their phone. Use standard PDF, not "PDF/A" or "PDF/X" or other variants. Keep file size under 2 MB.
"We never received it." A real possibility — spam filters happen. Use a tool that logs send dates and lets you re-send from the original record.
Customer disputes a line. If the line items match the signed estimate, you point at the signature. If there was a change order, you point at the signed change order. This is why we wrote the estimate guide.

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