Invoice Reminder Email Templates: On the Due Date

The due date is here. Sending a payment reminder on the exact day the invoice is due is direct, professional, and highly effective. It removes any ambiguity — your client knows payment is expected today. Below are four ready-to-use email templates in different tones.

Why Send a Reminder on the Due Date?

A due-date reminder is the most important touchpoint in your collections workflow. It establishes a clear boundary: today is the day. Clients who intended to pay but forgot will act immediately. Those who didn't will know you're tracking the invoice.

• Creates urgency — "Due today" is the strongest non-escalation prompt.
• Documents your follow-up — Establishes a paper trail if the invoice goes overdue.
• Professional standard — Expected in B2B relationships.

📋 Polite Tone

Best for: valued clients, first-time invoices, professional services.

Subject Line

Reminder: Invoice {{InvoiceNumber}} Due Today

Email Body

Dear {{ClientName}},

I hope you're having a good day. This is a gentle reminder that invoice {{InvoiceNumber}} for {{Amount}} is due today, {{DueDate}}.

If payment has already been submitted, please accept my thanks and disregard this notice. If not, I would be grateful if you could arrange payment at your earliest convenience today.

Please feel free to contact me if you have any questions.

With appreciation,
{{YourName}}
{{YourCompany}}

😊 Friendly Tone

Best for: ongoing relationships, creative freelancers, startup-to-startup invoices.

Subject Line

Hey! Invoice {{InvoiceNumber}} Is Due Today 📅

Email Body

Hi {{ClientName}},

Just a friendly ping — invoice {{InvoiceNumber}} for {{Amount}} is due today!

If it's already on its way, awesome — ignore this. If not, would you be able to process it today? Happy to resend the invoice or answer any questions.

Thanks a bunch!
{{YourName}}

🔔 Firm Tone

Best for: clients who frequently pay late, contractual relationships, larger organizations.

Subject Line

Payment Due Today: Invoice {{InvoiceNumber}} — {{Amount}}

Email Body

Dear {{ClientName}},

This is to inform you that invoice {{InvoiceNumber}} for {{Amount}} is due for payment today, {{DueDate}}.

As per our agreed payment terms, we kindly request that you process this payment today. Late payments may be subject to additional charges as outlined in our service agreement.

If payment has been made, please disregard this message. Otherwise, we expect payment to be completed today.

Thank you,
{{YourName}}
{{YourCompany}}

🚨 Final Notice Tone

Best for: accounts with overdue history, large outstanding balances, pre-escalation.

Subject Line

URGENT: Payment Required Today — Invoice {{InvoiceNumber}}

Email Body

Dear {{ClientName}},

This is a final notice that invoice {{InvoiceNumber}} for {{Amount}} is due for immediate payment today, {{DueDate}}.

We have not yet received payment. Non-payment by end of business today will result in your account being flagged as overdue, which may trigger late fees and a suspension of services.

Please remit payment immediately or contact us to discuss payment arrangements.

Regards,
{{YourName}}
{{YourCompany}}

Due-Date Reminder Best Practices

1. Send first thing in the morning — give clients the full business day to act.
2. Reference prior reminders — "As mentioned in my previous email…" adds weight.
3. Include a payment link — one-click payment dramatically increases conversion.
4. Keep it professional — avoid accusatory language, even in firm tones.
5. Log every touchpoint — document all reminders for your records.

Frequently Asked Questions

What if the client has already paid?

Always include a line like "If payment has been submitted, please disregard." This prevents awkwardness and shows you're aware of possible timing overlap.

Can I charge late fees starting today?

Only if your contract or terms of service explicitly state late fees and their start date. The due-date reminder is a great time to reference those terms.

How many reminders should I send on the due date?

One is sufficient. Sending multiple same-day reminders comes across as aggressive and unprofessional.