How to Follow Up on an Unpaid Invoice (With Email Templates)

Even reliable clients occasionally miss invoice due dates.

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The good news is that most overdue invoices can be resolved with a professional follow-up process. In many cases, clients simply forget, overlook an email, or experience an internal processing delay.

This guide explains when to follow up on unpaid invoices, how often to send reminders, and includes email templates you can use immediately.

When Should You Follow Up?

A common mistake is waiting too long.

A simple schedule works well:

• 3 to 7 days after the due date
• 14 days after the due date
• 30 days after the due date
• Final notice if payment remains outstanding

The earlier you follow up, the easier the conversation usually is.

Before Sending a Reminder

Verify:

• The invoice was delivered
• The due date has passed
• Payment has not already been received

This avoids unnecessary confusion.

First Reminder Email

Keep the first reminder friendly.

Subject:

Invoice INV-2026-001 Payment Reminder

Example:

Hello John,

I hope you're doing well.

This is a friendly reminder that Invoice INV-2026-001 became due on July 1, 2026.

If payment has already been processed, please disregard this message. Otherwise, please let me know if you need a copy of the invoice or have any questions.

Thank you.

Best regards,
Your Name

Second Reminder Email

If payment remains outstanding after two weeks, become slightly more direct.

Subject:

Invoice INV-2026-001 Now Overdue

Example:

Hello John,

I wanted to follow up regarding Invoice INV-2026-001, which is currently overdue.

Could you please provide an update on the payment status?

If there are any issues preventing payment, I'd be happy to discuss them.

Thank you for your attention.

Best regards,
Your Name

Final Reminder Email

If the invoice remains unpaid after several weeks, send a formal notice.

Subject:

Final Payment Reminder – Invoice INV-2026-001

Example:

Hello John,

This is a final reminder regarding Invoice INV-2026-001, which remains unpaid.

Please arrange payment as soon as possible or contact us to discuss the outstanding balance.

We value our business relationship and hope to resolve this matter promptly.

Thank you.

Best regards,
Your Name

Should You Call the Client?

Yes.

Many payment issues are resolved faster through a brief phone call than through multiple email exchanges.

Remain professional and assume good intentions unless proven otherwise.

Common Follow-Up Mistakes

Waiting Too Long

The longer an invoice remains unpaid, the harder it often becomes to collect.

Being Aggressive Too Early

The first reminder should always be polite and professional.

Not Including Invoice Details

Always reference:

• Invoice number
• Invoice date
• Due date
• Outstanding amount

Failing to Document Communication

Keep records of all reminders and responses.

How to Prevent Unpaid Invoices

• Use clear payment terms
• Display due dates prominently
• Send invoices immediately
• Require deposits on larger projects
• Send reminder emails automatically

Good invoicing practices reduce collection problems significantly.

Final Thoughts

Following up on unpaid invoices doesn't need to be uncomfortable. Most overdue invoices can be resolved through timely, professional communication.

Start with friendly reminders, escalate gradually, and maintain a professional tone throughout the process. Consistent follow-up protects your cash flow while preserving valuable client relationships.

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