Invoice Late Fees in Canada: What to Put in Writing

There is no single late-fee rate that is automatically valid for every Canadian invoice. The practical starting point is a payment term accepted before the work begins, a specific due date, a clearly stated calculation method, and a rate expressed for both the billing period and the year.

If the client is a consumer, if the balance is disputed, or if collection may be necessary, have a lawyer review the clause for the province involved. Adding a fee for the first time after an invoice is already overdue is much harder to justify than enforcing a term the client accepted in a contract or estimate.

Quick disclosure checklist

Item | What to state

-----|--------------

Copy-ready wording to review

The following is an illustration, not a rate recommendation

"Payment is due on [date]. Subject to applicable law, balances unpaid after that date may bear simple interest at 1% per month (12% per year), calculated on the unpaid principal from the due date until payment."

Replace the bracketed date and confirm the rate and calculation method for your business. Do not advertise only a monthly percentage. Section 4 of Canada's Interest Act addresses written contracts that state interest for a period shorter than one year and requires an express yearly equivalent in the circumstances it covers.

Calculation example

Assume an accepted term of simple interest at 1% per month (12% per year) and an unpaid principal balance of $2,000:

Description | Amount

------------|-------

Show the charge separately from the original services. Keep the original invoice number, due date, overdue principal, rate, period, and calculation in the account record so the client can understand the amount.

In Quebec, Revenu Québec states that GST and QST are calculated on the invoiced amount before a late-payment charge is added. Review the official late-payment charge guidance before handling the tax entry.

Put the term in the agreement, not only the reminder

A late-fee sentence on an invoice is useful notice, but the stronger workflow is to include the same term in the proposal, estimate, service agreement, and invoice. Ask the client to approve the agreement before work starts. Keep the rate, annual equivalent, due date, and calculation method consistent across every document.

For copy-ready due-on-receipt, Net 7, Net 15, and Net 30 clauses, use invoice payment terms canada.

Follow up before adding a charge

1. Send the invoice promptly with the due date and payment instructions.

2. Send a courteous reminder a few days before the due date.

3. On the first overdue day, resend the invoice and ask the client to confirm the payment date.

4. Resolve genuine disputes about the work or amount before escalating.

5. If the accepted agreement permits a charge, send a calculation the client can verify.

6. Keep a record of the contract, invoice, reminders, and payments.

The purpose is predictable payment, not surprising the client. A deposit, milestone billing, clear Interac instructions, and short terms can prevent more late payments than a severe penalty.

For a complete reminder sequence, see Late Payment Reminder Letter Canada | Just Invoice. To calculate a disclosed charge for an overdue balance, use late invoice payment calculator.

When to get professional advice

Ask a lawyer or qualified collection professional before applying a fee when the client is a consumer, the agreement is silent, the proposed rate is high, the debt crosses provinces, the client disputes the invoice, or you may begin formal collection. Tax treatment and bookkeeping should be confirmed with your accountant.

Before sending the next invoice

• Choose a due date that fits the client and project.
• Put the payment and interest terms in the accepted agreement.
• Express any periodic interest rate with its annual equivalent.
• Add a straightforward Interac address or payment link.
• Keep the late charge separate and fully explained.

Use invoice generator to create the invoice, then add the reviewed wording to its payment terms.