What belongs on every professional invoice
A professional invoice contains ten standard elements. Leaving any of them out gives the client a reason to ask questions before paying — which delays everything.
1. Your business name and contact information
Include your full name or business name, mailing address, phone number, and email address. If you operate as a registered business, include your business registration number. Clients need this to know who to pay and how to reach you if they have questions.
2. Your client’s name and contact information
Address the invoice to the right person or department. Use the name of whoever you worked with, or the accounts payable department if the business is large enough to have one. Getting this wrong is the single most common reason invoices get lost inside organisations.
3. A unique invoice number
Every invoice needs a unique number — INV-001, INV-002, and so on. This makes it easy to reference the invoice in emails, bank transfers, and accounting records. Clients’ accounts payable systems often require an invoice number before processing payment.
4. Invoice date
The date you issued the invoice. This is the starting point for calculating when payment is due.
5. Due date and payment terms
State clearly when payment is due. Common terms are Net 7 (7 days), Net 15, or Net 30. Writing “due upon receipt” is common for small jobs. Whatever you choose, make it explicit — “Payment due by June 14, 2026” is better than “Net 14” because it removes any ambiguity.
6. Line items
List every service or product separately with a description, quantity, unit (hours, days, items), rate, and subtotal per line. Vague line items like “web work — $2,400” invite disputes. Specific ones like “Website redesign — 16 hours × $150/hr — $2,400” do not.
7. Subtotal, tax, and total
Show the subtotal before tax, then the tax amount as its own line (with the tax name and rate — e.g. “HST 13% — $312.00”), then the total amount due. Combining these into a single number looks unprofessional and makes it harder for clients to reconcile the amount with their own tax records.
8. Your tax registration number (if applicable)
If you are registered for HST, GST, or VAT, your registration number must appear on every invoice that includes that tax. In Canada, an invoice that charges HST without a business number is not a valid tax document, and your client cannot claim the input tax credit. This is a legal requirement, not a suggestion.
9. Payment instructions
Tell the client exactly how to pay. If you accept e-transfer, include the email address to send it to. If you accept bank transfer, include your bank name, account number, and transit number. If you accept cheques, say who to make it payable to. The easier you make it to pay, the faster you get paid.
10. A notes or terms section (optional but useful)
A short notes field at the bottom is a good place to include a thank you, any late payment policy (“Invoices unpaid after 30 days are subject to a 2% monthly interest charge”), or any agreed scope limitations.
Invoice formatting tips
Content matters more than design, but presentation still has an effect. A clear, well-formatted invoice signals that you are organised and professional — which subtly affects how quickly clients prioritise your payment.
- Use a consistent font — one typeface, two weights maximum.
- Include your logo at the top. It makes the invoice look intentional rather than improvised.
- Align numbers to the right so subtotals and totals scan visually without reading each line.
- Leave whitespace between sections. A dense wall of text is harder to read and easier to misread.
- Export as PDF — never send a Word document or spreadsheet. PDFs look the same on every device and cannot be accidentally edited.
Common invoicing mistakes to avoid
- No invoice number. Without a number, clients have no way to reference the invoice when they contact their accounts payable department. It gets lost.
- Vague line items. “Consulting services — $3,000” invites disputes. Break it down by deliverable, day, or hour.
- No due date. Without a due date, “when I get around to it” becomes the client’s payment schedule.
- Missing tax number. If you collect HST or GST, your registration number is legally required on the invoice.
- Wrong contact. Sending to the wrong person adds days or weeks of delay as the invoice bounces between inboxes.
- Sending it late. Invoice immediately on project completion. The longer you wait, the longer the client waits to start the clock on their payment terms.
How to send an invoice
Send the PDF by email. In the subject line include the invoice number and the total — “Invoice INV-042 — $2,400 due June 14” — so the client knows exactly what is in the email before opening it. Keep the body of the email short: one sentence confirming what the invoice is for, and one line with the total and due date.
Follow up the same day with a short message if your contact is someone you have a direct relationship with. It is not rude — it ensures the invoice arrived and is in the right hands.
What to do when a client doesn’t pay
Most late payments are not intentional. Invoices get buried or forwarded to the wrong person. A polite follow-up usually resolves it.
- Day of due date: Send a short, friendly reminder. Attach the original PDF again. Do not assume the client is being difficult — assume they forgot.
- One week late: Follow up again, slightly more direct. Confirm the payment method is still correct and ask if there is anything blocking payment.
- Two weeks late: Email and call. Mention your late payment terms if you have them. Keep the tone professional.
- One month late: Send a formal notice. For larger amounts, consult a lawyer or collections service depending on the jurisdiction.
Document every follow-up. If a dispute ever goes to small claims court, a log of your communication is strong evidence.
A simpler way to create and send invoices
BillTick handles all of the above automatically. Set up your Business Profile once — name, address, tax number, payment terms, bank details — and every new invoice pre-fills those fields. Add your line items, set the due date, and export a clean PDF in one click. No watermarks, no third-party branding, no subscription.
If you bill by the hour, the built-in stopwatch converts tracked time directly into a line item on your invoice — no manual math needed.