01Send 1–3 days after the due date
Polite first nudge for a slightly overdue invoice
Good clients who probably missed the invoice or need a gentle prompt.
Subject: Quick reminder: invoice [Invoice Number] is due
Hi [Client Name],
I hope you're doing well. I'm checking in on invoice [Invoice Number] for [Project Name], which was due on [Due Date].
The outstanding balance is [Amount]. I've attached the invoice again here for convenience, and you can pay using this link: [Payment Link].
Could you please let me know when payment is scheduled? Thanks so much.
Best,
[Your Name]
02Send 5–7 days after the due date
Friendly follow-up when the client has gone quiet
A client who has not replied to your first late payment reminder.
Subject: Following up on overdue invoice [Invoice Number]
Hi [Client Name],
I wanted to follow up on invoice [Invoice Number] for [Project Name]. It was due on [Due Date], and I have not seen payment come through yet.
The current outstanding balance is [Amount]. If it has already been paid, please send the payment confirmation and I'll update my records.
If it has not been scheduled yet, could you please confirm when I should expect payment?
Thanks,
[Your Name]
03Send 10–14 days after the due date
Firm payment reminder with a clear deadline
Late invoices that need a direct but professional escalation.
Subject: Action needed: overdue invoice [Invoice Number]
Hi [Client Name],
I'm following up again about invoice [Invoice Number], originally due on [Due Date]. The outstanding balance is [Amount].
Please arrange payment by [New Deadline]. If there is an issue with the invoice or your payment process, let me know today so we can resolve it quickly.
Until payment is received or a payment date is confirmed, I won't be able to begin any additional work or release further deliverables.
You can pay here: [Payment Link]
Best,
[Your Name]
04Send 21+ days after the due date
Final notice before pausing work or adding late fees
Invoices that are significantly overdue and need a final written warning.
Subject: Final notice: invoice [Invoice Number] is overdue
Hi [Client Name],
This is a final reminder that invoice [Invoice Number] for [Project Name] remains unpaid. It was due on [Due Date], and the outstanding balance is [Amount].
Please complete payment by [Final Deadline]. If payment is not received by that date, I will pause all current work and may apply the late fee outlined in our agreement.
If there is a billing issue preventing payment, please reply before [Final Deadline] so we can agree on a written payment plan.
Payment link: [Payment Link]
[Your Name]
05Send when the client usually pays on time but missed this one
Relationship-saving check-in for a reliable client
Long-term clients where you want to preserve trust while still asking clearly.
Subject: Can you help me confirm invoice [Invoice Number]?
Hi [Client Name],
I'm doing a quick invoice check and noticed invoice [Invoice Number] for [Project Name] is still showing as unpaid on my end.
It may simply be stuck in processing, but could you help me confirm the payment status? The invoice amount is [Amount], and the due date was [Due Date].
If your accounting team needs anything else from me, I'm happy to send it over.
Thanks for checking,
[Your Name]