Past Due Invoice Email
Following up on a past due invoice can feel awkward, but it's a necessary step to keep your business running smoothly. A well-written past due invoice email helps you remind customers about unpaid invoices professionally while keeping a good business relationship.
With Docelf, you can send invoices directly from the system and track when they are opened. If an invoice remains unpaid, following up becomes easier because you know exactly when and how to remind your customer.

- PDF, Email or Print
- Convert to a Receipt
- See when your invoice has been opened
- Keep track of due dates and payments
Past Due Invoice Templates by Docelf
Sending an overdue invoice email doesn’t have to be stressful. Docelf makes it simple by allowing you to:
- Send invoices directly from the system and track when they’re opened.
- Download invoices as PDFs to send manually.
- Use the "Terms and Conditions" field to include payment terms upfront, reducing late payments.
Below, you’ll find 9 sample invoice templates available in Docelf. Pick the one that fits your business best.
Other Invoice Template File Formats
Looking for an invoice template that fits your workflow? We offer options in Word, Google Docs, Excel, and Google Sheets to suit your needs.
Need a polished and professional layout? A Microsoft Word invoice template keeps formatting easy and flexible. If you prefer automated calculations and team collaboration, an Excel or Google Sheets invoice template is a great choice. For simple, cloud-based editing, a Google Docs invoice template ensures quick and accessible invoicing.
No matter your industry, these templates help you create invoices that are professional, clear, and easy to use.
- Word Invoice Template
- Google Docs Invoice Template
- Excel Invoice Template
- Google Sheets Invoice Template

- PDF, Email or Print
- Convert to a Receipt
- See when your invoice has been opened
- Keep track of due dates and payments
How to Write a Past Due Invoice Email
When an invoice is overdue, sending a professional and clear follow-up email increases your chances of getting paid. Here’s how to write an effective past due invoice email:
- Use a Clear Subject Line: Examples include “Past Due Invoice #123 – Action Required” or “Reminder: Overdue Invoice #123.”
- Address the Customer Politely: Keep the tone friendly and professional.
- Mention the Invoice Details: Include the invoice number, amount due, and original due date.
- Attach or Link the Invoice: If using Docelf, the invoice is sent directly, and you can track when it’s opened.
- Specify Payment Methods: Make it easy for the customer to pay by listing accepted methods.
- Offer Assistance: Ask if there are any issues preventing payment and offer solutions.
- Set a Firm but Professional Deadline: Encourage timely payment with a clear timeframe.
Past Due Invoice Email Examples
Not sure how to phrase your follow-up? Here are three professional email templates for different overdue situations.
1. Friendly First Reminder
Subject: Friendly Reminder: Invoice #123 Due [Due Date]
Hi [Customer’s Name],
I hope you’re doing well. This is just a friendly reminder that Invoice #123 for [Product/Service] was due on [Due Date].
You can review and pay it here: [Docelf Invoice Link]
Best,
[Your Name]
[Your Business Name]
2. Firm Follow-Up for Late Payment
Subject: Follow-Up: Overdue Invoice #123
Hi [Customer’s Name],
I wanted to follow up regarding Invoice #123, which was due on [Due Date]. As of today, we haven’t received the payment.
The outstanding balance is [Total Due]. You can settle the invoice here: [Docelf Invoice Link]
Best,
[Your Name]
[Your Business Name]
3. Final Notice Before Action
Subject: Final Notice: Immediate Payment Required for Invoice #123
Hi [Customer’s Name],
This is our final notice regarding Invoice #123, which was due on [Due Date] and is now [X] days overdue.
The outstanding balance is [Total Due]. Please process payment immediately using this link: [Docelf Invoice Link]
Looking forward to resolving this soon.
Best,
[Your Name]
[Your Business Name]
Customize Your Invoice with Docelf
With Docelf, you can add a Terms and Conditions section to every invoice, ensuring customers see your payment terms from the start. This helps prevent late payments and makes follow-ups easier.
Sending invoices directly from Docelf means you can track when they’re opened. If an invoice is overdue, you’ll know when it’s time to follow up.
Your invoice isn’t just a bill—it’s part of your brand. Customize it with these simple options to make every invoice look professional and uniquely yours.
- Add Your Logo: Build trust and make your invoices instantly recognizable.
- Pick Your Fonts and Colors: Choose a font and color that reflect your business style.
- Choose Your Currency: Select from USD, AUD, CAD, GBP, and EUR for international invoicing.
- Customize Your Invoice Name: Rename your invoice to match your business needs, whether you're a contractor, freelancer, or service provider.
- Personalize Your Footer: Add key details like your email, phone number, or website to keep communication easy.
- Attach Supporting Documents: Include contracts, breakdowns, or reference images to provide extra clarity.
With these options, your invoices will look as polished and professional as your business. Happy invoicing!

- PDF, Email or Print
- Convert to a Receipt
- See when your invoice has been opened
- Keep track of due dates and payments