Template
Past due invoice reminder letter template (friendly)
A polite reminder for a past due invoice. Use this before escalating to a firmer notice.
Published Jan 20, 2026
How it works
Fill out form
Complete the guided fields online.
Preview PDF
Review the generated PDF before mailing.
We print and mail it via USPS.
Copy/paste template
[Your Company Name]
[Your Company Address]
[City, State ZIP]
[Phone]
[Email]
[Mail this letter](cta)
[Date]
[Recipient Name]
[Recipient Company]
[Recipient Address]
[City, State ZIP]
Re: Friendly reminder - Invoice #[Invoice Number]
Amount Due: $[Amount]
Original Due Date: [Date]
Hello [Recipient Name],
I hope you're well. This is a friendly reminder that invoice #[Invoice Number] for $[Amount] is past due.
If you've already sent payment, please disregard this notice. Otherwise, please remit payment by [New Due Date].
Payment options: [methods].
Payment instructions: [link or address].
Thank you,
[Your Name]
[Title]
[Company]
Before you mail (checklist)
- Confirm the invoice number and amount.
- Include an updated due date.
- Add payment methods and contact info.
When to use Certified Mail
If you need proof the reminder was delivered, use Certified Mail with electronic return receipt (First Class only).
Certified Mail with electronic return receipt (First Class only)
Common mistakes to avoid
- Vague amounts or missing invoice number.
- No payment instructions.
- Forgetting to include contact info.
What you get
- • Friendly reminder template
- • Certified Mail with electronic return receipt (First Class only)
- • First Class or Express delivery options
Simple pricing
Base fee plus per-page printing. Postage included. See pricing for details.
Which mailing option and proof should you choose?
PostalForm offers U.S. letter mailing with different delivery and proof options. First-Class suits routine correspondence; Certified Mail adds mailing and delivery records, and Electronic Return Receipt adds a downloadable signature record. Expedited delivery prioritizes speed. Review the destination, estimated dates, total price, and required proof before paying.
| Mailing option | Delivery speed | Proof | Use when | Avoid when |
|---|---|---|---|---|
| USPS First-Class Mail | First-Class Mail delivery estimate shown before payment. | Available processing scans; no recipient signature or Certified Mail receipt. | Routine letters when a signed delivery record is unnecessary. | Your instructions require Certified Mail, a signature, or a deadline this estimate cannot meet. |
| Certified Mail | First-Class delivery speed; certification does not make delivery faster. | USPS mailing and delivery/attempt tracking; no Electronic Return Receipt unless added. | You need a recorded mailing and delivery or attempted-delivery status. | You need a downloadable signature record or faster delivery. |
| Certified Mail + Electronic Return Receipt | First-Class delivery speed; signature collection may require redelivery or pickup. | Certified Mail records plus a downloadable USPS signature record when available. | Your instructions call for Certified Mail with Return Receipt or you need the signature record. | Your recipient requires an original enclosure, personal service, or another submission method. |
| Expedited / Express with signature | Faster estimated delivery range shown at checkout; production cutoff and destination apply. | Carrier tracking and signature option; this is separate from Certified Mail and ERR. | Speed and signature matter and checkout offers the service for your destination. | A rule specifically requires Certified Mail or the displayed estimate misses your deadline. |
Availability and delivery estimates depend on the document and destination. Mailing proof does not establish that a recipient accepted a filing or that legal service requirements were met. Delivery estimates · Full pricing
Why PostalForm
Delivery options
First Class or Expedited with optional Certified Mail.
Address validation
Reduce returned mail and delivery errors.
Fast checkout
Upload once and mail in minutes.
FAQs
- Do you offer tracking?
- Yes. Add Certified Mail with electronic return receipt (First Class only).
- Can I include attachments?
- Yes. Combine the letter and invoice into one PDF.
Ready to get started?
Attach the invoice, review the friendly reminder packet, and choose mailing proof.