Start with a factual reminder that includes the invoice number, amount and due date. If payment remains overdue, ask whether there is a processing issue, then use a firmer message that names the agreed next step. Check your contract and obtain legal advice before making formal legal demands.
An overdue invoice needs a process, not a burst of frustration.
Start by checking whether the PDF reached the right accounts contact, whether a PO is missing and whether the client raised a query. Then choose wording that matches the age of the debt and the agreement you already have.
Template 1: Before or on the due date
Subject: Reminder: Invoice INV-2026-001 due 15 September
Hi [Name],
This is a reminder that invoice INV-2026-001 for R[amount] is due on 15 September 2026.
I have attached the invoice again for convenience. Please let me know if your accounts team needs a PO, vendor reference or any other information to process it.
Regards,
[Name]This message makes payment easy without assuming the client has done anything wrong.
Template 2: A few days overdue
Subject: Invoice INV-2026-001 is overdue
Hi [Name],
Invoice INV-2026-001 for R[amount] was due on 15 September 2026 and remains unpaid.
Could you confirm the expected payment date? If there is a query about the work or invoice, please send it to me today so we can resolve it.
Regards,
[Name]Ask for an expected date. “We will pay soon” is not enough information to plan cash flow.
Template 3: Firm escalation
Subject: Action required: overdue invoice INV-2026-001
Hi [Name],
Despite the reminders below, invoice INV-2026-001 for R[amount] remains unpaid.
Please confirm payment or a documented resolution by [date]. If we do not hear from you, we will follow the next step set out in our agreement.
Regards,
[Name]Only name a late fee, interest charge, suspension or other consequence when it was agreed beforehand and you have checked that it applies. Do not use a template to make a legal threat you do not understand or cannot support.
Prevent the next overdue invoice
Put the payment date, payment reference and query contact on every invoice. Confirm the accounts-payable email before sending it. Record a follow-up date when you issue the document.
The free IDJoy generator helps you create a clear PDF with terms, notes and banking details now. It does not send reminders or track overdue status. The invoice app remains in production for businesses that need saved documents, reusable client details and stored services.