Guide
Demand letter checklist
Use this checklist to make sure your demand letter is clear, complete, and ready to send. Requirements can vary by jurisdiction and contract, so confirm any specific notice rules that apply to your situation.
Published Jan 20, 2026
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Key takeaways
- Be specific: who owes what, why, and when payment is due.
- Attach supporting documents and keep a copy for your records.
- Use proof of delivery (Certified Mail) when delivery matters.
When to use a demand letter
- A client or customer is past due and earlier reminders failed.
- A contract or policy requires written notice before escalation.
- You plan to pursue collections or small claims and need a paper trail.
Required details to include
- Recipient name and mailing address
- Invoice number(s) and total amount due
- Clear payment deadline date
- Payment instructions (check, ACH, portal, mailing address)
- Your contact information
- A brief summary of the work or obligation
Attachments checklist
- Invoice or statement showing the balance
- Contract, work order, or scope summary
- Timeline of work performed or key events
- Photos, receipts, or supporting documentation (if relevant)
Step-by-step mailing checklist
- Finalize the letter — Confirm amounts, dates, and the exact deadline.
- Assemble the packet — Combine the letter and attachments into one PDF.
- Verify addresses — Use the exact recipient address from your contract or records.
- Choose delivery — First-Class Mail for routine letters; Express when timing is tight.
- Save proof — Keep a copy of the PDF and tracking or signature records.
Example demand paragraphs
Payment request
We provided [services/work] on [dates] under [agreement]. The outstanding balance is $[amount]. Please remit payment in full by [deadline date].
Next steps
If payment is not received by [deadline date], we may pursue other remedies, including collections or legal action where permitted. Please contact us at [phone/email] if you believe this is in error or to discuss resolution.
What not to say
- Don't threaten actions you are not prepared to take.
- Avoid insults, harassment, or emotional language.
- Do not include unverified facts or admissions you can't support.
- Don't send without a clear deadline and payment method.
Recommended mailing method
If you need proof of delivery, use Certified Mail with Electronic Return Receipt (First-Class Mail only). For tight deadlines, consider Express delivery and mail early. Learn more about Certified Mail.
Sources
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
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