How to write an overdue invoice email

First, check what is actually overdue.

Open the invoice and your own payment records before writing. Confirm the agreed due date, the outstanding amount, the recipient, and any payment that may have arrived since you last checked. An invoice sent to the wrong billing contact needs a routing fix, not a stronger email.

If the client has already raised a question about the work, the amount, or a missing document, respond to that question first. Pause scheduled reminders while you resolve it. A disagreement should not receive the same message as a simple missed due date.

• Check the invoice number and original due date.
• Use the remaining balance, including any partial payment.
• Confirm the billing contact and any purchase-order reference.
• Review the payment link and any earlier reply.

Give the email a clear, small job.

Put the invoice reference in the subject. In the message, name the amount and due date, then ask for payment or an expected payment date. If you include a payment link, use the destination already agreed with the client and check that it opens the correct page.

You do not need a long explanation of your cash flow or an apology for following up. A short, factual message is easier to forward to the person who can act on it. Keep one useful request in the closing line.

Hi [client name],

I’m following up on invoice [invoice number] for [outstanding amount], which was due on [due date]. My records show that the balance is still outstanding.

Could you arrange payment, or let me know the expected payment date? The payment details are [in the original invoice / at your agreed payment link].

If payment has already been sent, please share the reference so I can check and update my records.

Thanks,
[your name]

Follow up on the next step, not just the invoice.

If there is no response, give the client a reasonable interval based on your agreement and the earlier conversation. An example routine is a first check-in shortly after the due date, a second message several business days later, and a personal conversation after that. This is a planning example; there is no single schedule that fits every client.

In your second message, refer to the previous email and ask for a specific next step. When a client gives an expected payment date, record it and wait until that date has passed before chasing again.

Hi [client name],

Following up on my message from [previous email date] about invoice [invoice number]. The outstanding balance is [amount].

Could you confirm the expected payment date, or let me know if a document or reference is missing? I can help resolve anything holding this up.

Thanks,
[your name]

Remove the things that make a reminder harder to answer.

Avoid an unexplained total, several competing payment links, or a subject such as “Urgent!!!” with no invoice reference. Do not imply that a person has read a message because an email provider reported delivery. Delivery only describes the last known handoff to the recipient’s mail server.

Do not add a late fee, legal claim, or threat to a routine template without checking the agreement and the applicable rules. If the issue needs formal escalation, take it out of the automatic reminder queue and get appropriate professional advice for your situation.

Keep the message and invoice together in Dunlio.

In Invoice Follow-ups, add the invoice or review a CSV import. Save your own reminder text in Templates, check the designer and plain-text previews, then confirm a manual send. The current release records amounts in EUR and uses the payment status you enter yourself.

Before enabling automatic reminders, confirm your account email, use that confirmed mailbox as your Reply-to address, obtain early-access sending approval, and review the schedule. Keep the unpaid balance current. Mark the invoice paid, paused, or disputed as soon as its situation changes. See the sending guide for the account and delivery checks that can hold a reminder.

Need a different tone or situation? Use the invoice reminder email templates as a starting point, or build a repeatable freelancer follow-up routine.