Invoice Reminder Email Templates: 1 Day Before Due Date

Sending a payment reminder one day before the due date is the single most effective way to get paid on time. Research shows that proactive reminders reduce late payments by up to 30%. Below are four professionally written email templates — each in a different tone — ready to copy, customize, and send.

Why Send a Reminder 1 Day Before the Due Date?

A pre-due reminder serves as a gentle nudge that keeps your invoice top-of-mind. It signals professionalism, reduces awkward follow-ups, and gives your client time to process payment before the deadline. Most accounting professionals recommend this as the first touchpoint in any invoice reminder sequence.

• Prevents late payments — Clients often forget, not ignore. A timely reminder fixes that.
• Preserves the relationship — You're being helpful, not pushy.
• Reduces DSO — Days Sales Outstanding drops when you remind proactively.

📋 Polite Tone

Best for: new clients, large accounts, formal industries (legal, finance, government).

Subject Line

Friendly Reminder: Invoice {{InvoiceNumber}} Due Tomorrow

Email Body

Dear {{ClientName}},

I hope this message finds you well. I wanted to send a courteous reminder that invoice {{InvoiceNumber}} for {{Amount}} is due on {{DueDate}} — tomorrow.

If payment has already been arranged, please disregard this message. Otherwise, I would appreciate it if you could process the payment at your earliest convenience.

Please don't hesitate to reach out if you have any questions or need a copy of the invoice.

Kind regards,
{{YourName}}
{{YourCompany}}

😊 Friendly Tone

Best for: long-term clients, creative agencies, small businesses with established rapport.

Subject Line

Quick Heads Up — Invoice {{InvoiceNumber}} Due Tomorrow

Email Body

Hi {{ClientName}},

Just a quick heads-up that invoice {{InvoiceNumber}} for {{Amount}} is due tomorrow, {{DueDate}}.

No worries if it's already in the works! If you need the invoice resent or have any questions, just let me know.

Thanks so much,
{{YourName}}

🔔 Firm Tone

Best for: clients with a history of late payments, high-value invoices, formal B2B relationships.

Subject Line

Payment Due Tomorrow: Invoice {{InvoiceNumber}}

Email Body

Dear {{ClientName}},

This is a reminder that invoice {{InvoiceNumber}} in the amount of {{Amount}} is due tomorrow, {{DueDate}}.

Please ensure payment is processed by the due date to avoid any late fees or service interruptions as outlined in our agreement.

If you have already submitted payment, thank you. Otherwise, please arrange payment promptly.

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

🚨 Final Notice Tone

Best for: repeat offenders, last reminder before escalation, when prior reminders were ignored.

Subject Line

URGENT: Invoice {{InvoiceNumber}} — Payment Required by {{DueDate}}

Email Body

Dear {{ClientName}},

This is a final reminder that invoice {{InvoiceNumber}} for {{Amount}} is due tomorrow, {{DueDate}}.

Failure to remit payment by the due date may result in late fees and a review of your account status per our terms of service.

Please confirm payment arrangements immediately. If there are extenuating circumstances, contact us today so we can discuss options.

Sincerely,
{{YourName}}
{{YourCompany}}

Best Practices for Pre-Due Reminders

1. Send between 9–11 AM in your client's timezone for maximum open rates.
2. Include the invoice number and amount — make it easy to act on.
3. Attach or link the invoice — remove friction from the payment process.
4. Use a clear subject line — mention the due date and invoice number.
5. Automate it — tools like Can You Pay That send these automatically.

Frequently Asked Questions

Is it appropriate to send a reminder before the due date?

Absolutely. Pre-due reminders are standard business practice and are appreciated by most clients. They're seen as helpful, not aggressive.

What time should I send the reminder?

Between 9 AM and 11 AM on a business day. Avoid weekends and holidays.

Should I attach the invoice again?

Yes, always. Clients may have lost or misfiled the original. Make payment as frictionless as possible.