How to follow up on an unpaid invoice

Late payment does not always mean a bad client. An invoice may be waiting for approval, missing a purchase-order reference or sitting with the wrong person. A calm, consistent follow-up process gets better results than an emotional message.

A simple reminder timeline

Two days before the due date

Send a helpful reminder with the invoice number, amount and due date. Ask whether the accounts team needs anything else.

One day after the due date

Assume oversight and ask for the expected payment date.

Seven days overdue

Be direct, restate the agreed terms and ask for a specific response. Contact the accounts payable person if your day-to-day client is not responsible for payment.

Fourteen days overdue

Escalate according to your contract and business policy. Pause further work only when your agreement allows it, and keep every communication factual.

What every reminder should contain

• Invoice number and issue date.
• Exact outstanding amount and due date.
• Invoice PDF or a clear link to it.
• Payment instructions.
• A polite request for the expected payment date.

Prevent the next delay

Ask who approves invoices before the project starts. Use a clear due date, align descriptions with the purchase order, and send invoices promptly. Track paid and unpaid status in one place so follow-ups happen on time.