Last updated: February 19, 2026
Invoice Email: Overdue Invoice Reminder — Short, Formal, Friendly, Firm
Stuck between being friendly and getting paid? Mastering the overdue invoice email is your secret weapon for maintaining client relationships while securing cash flow.
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Quick Template (Short)
Hi [[NAME]], a gentle reminder that invoice [[REFERENCE]] is now overdue. Please arrange payment at your earliest convenience. Thanks, [[YOUR_NAME]]
Formal Version
Dear [[NAME]], This letter serves as a formal reminder that your payment for invoice [[REFERENCE]], originally due on [DATE], remains outstanding. We kindly request you process this payment within five business days to avoid further action. Please contact us if you have any disputes. Sincerely, [[YOUR_NAME]]
Friendly Version
Hey [[NAME]], Hope you're doing well! Just circling back on invoice [[REFERENCE]]—it looks like it slipped past the due date. No rush, but whenever you get a chance to settle it up, that'd be great. Cheers, [[YOUR_NAME]]
Firm Version
[[NAME]], This is your second notice regarding the overdue balance on invoice [[REFERENCE]]. Your account is now 30 days past due. Full payment is required by [DATE] to prevent suspension of services and escalation to our collections partner. [[YOUR_NAME]]
Subject Lines (Pick one)
- Action Required: Invoice [[REFERENCE]] is Overdue
- Following Up on Invoice [[REFERENCE]]
- Your Invoice [[REFERENCE]] – Payment Reminder
Tips
- Always include the specific invoice number and original due date in every reminder.
- Offer a concrete payment plan option in your second email, not the first.
- State the exact late fee amount and when it will be applied, using your contract terms.
Related templates
More templates in the same category:
- How to Write Invoice Email: Send Invoice Again (With Examples)
- Invoice Email: Overdue Invoice Reminder (Copy + Paste)
- How to Write Invoice Email: Overdue Invoice Reminder (With Examples)
- Invoice Email: Send Invoice Again — Short, Formal, Friendly, Firm
- How to Write Invoice Email: Send Invoice Again (With Examples)
FAQ
Q: What is the best day of the week to send an overdue invoice reminder?
A: Send on Tuesday or Wednesday morning. Avoid Mondays (inbox overload) and Fridays (often ignored until next week).
Q: Should I accept a partial payment on an overdue invoice?
A: Yes, but only with a signed written agreement that the partial payment does not constitute acceptance of future delays and the full balance is due by a new, strict date.
Personalized Generator (Fill & Copy)
Fill in the fields to generate a ready-to-send invoice email. Example Invoice: Invoice #INV-7712.