How to follow up on an unpaid invoice

A respectful sequence for checking a balance and resolving what is holding it up.

A late invoice does not always mean a customer is refusing to pay. It may be at the wrong email address, missing a reference, or waiting for approval. Start with the facts, then make the next step easy.

Verify before you remind

Check your bank and payment records for a deposit, including partial payments and payments made under a different reference. Confirm the due date and that the original invoice was sent to the agreed billing contact.

Review whether the customer raised a question, requested a correction, or uses an approval portal. Chasing an invoice that is already paid or known to be disputed creates extra work for both sides.

Confirm the actual outstanding balance.
Check the recipient and date of the original send.
Look for a pending dispute or missing purchase order.

Send a short first reminder

Keep the first message neutral. Refer to the invoice number, amount, and due date; attach the invoice again; ask whether they received it and whether anything is needed to process it.

For example: “Hello [name], I’m checking on invoice [number] for [amount], due [date]. I’ve attached a copy for convenience. Could you confirm it reached the right person and let me know if you need anything from me?”

Follow up with a specific request

If there is no response, follow up through the agreed business channel and ask for a payment date or the name of the person handling it. Refer to the previous message so the customer has context.

If they say the bill is incorrect, pause generic reminders. Ask what needs correcting, compare it with your agreement, and send a clearly identified correction when appropriate.

Document the contact date and response.
Ask for a concrete next step, not just “an update.”
Keep the tone factual even if the invoice is significantly late.

Escalate according to your agreement

For a persistent balance, review the contract and your local requirements before applying any late charge, suspending work, or taking formal steps. Do not add a fee the customer did not agree to or that you have not checked is permissible.

A final written notice should state the balance, relevant invoice numbers, previous contact, and what action you plan to take and when. For significant disputes, seek appropriate legal or accounting advice.

Keep the status accurate

As payment arrives, match it to the correct invoice and update the record. If it is partial, keep the remaining balance open and confirm the next expected payment.

A regular review of outstanding invoices helps you follow up consistently, but the status in any tool is only as reliable as the reconciliation behind it.