Late Invoice Payment Fee Calculator

Calculate days late, a monthly interest-style late fee or flat charge, and the updated balance. Includes copy-ready wording for your client.

This tool is for informational purposes only. It is not accounting, tax, or legal advice. Always verify CRA, Revenu Québec, and provincial rules before invoicing.

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Late payment fee calculator

Invoice amount ($)Due datePayment dateFee typeRate or amount

Suggested note to client

Disclose terms upfront

Late fees work best when they are stated on the original invoice or contract. Many Canadian businesses use around 1.5% per month on overdue balances.

Create an updated invoice Late fee guide