Vendor payment demand letter
By Justin Winter · Updated August 22, 2026
The short answer
A demand the vendor signed for is harder to ignore, and harder to deny later. Send it Certified with electronic Return Receipt, $14.99 all-in: USPS records when it was mailed and when it was signed for. Preview the exact pages free. This template is not legal advice.
The math
The math on one certified letter.
| Option | Cost | Your time |
|---|---|---|
| paperplane, Certified + Return Receipt | $14.99, all in | About two minutes |
| At the counter | USPS fees, plus printing, an envelope and the trip | About ten minutes at the counter, plus the drive and the line |
USPS charges the same fees whoever hands the letter over. The difference is the trip, the form and the slip you keep for a year.
How it works
- Open the template and fill in the bracketed fields with your specific details.
- Confirm the recipient's address.
- Pay $14.99 — we print the next business day and email you the tracking number.
- Your document file is permanently deleted 30 days after delivery.
This is a template, not legal advice — requirements and available remedies vary by state and by your specific situation, so confirm the details that matter for your case before sending.
Questions before you send
Why not go to the post office myself?
You can, and if your time is free it costs less. USPS charges the same fees whoever hands the letter over; paperplane does not replace the post office, it replaces the trip. The mailing record comes from USPS, not from us. $12.99 covers the printing, the envelope, PS Form 3800, a USPS address check before you pay and a handoff the next business day. For a letter you already know how to send, the counter is a fine choice.
What if they refuse the letter?
USPS tracking records what happened to it, including refused or unclaimed. You still have the mailing record. Rules on what that means vary, so check with your court or an attorney if a deadline depends on it.
If something goes wrong, do I pay?
If we cannot mail the letter, the hold on your card is released and you are not charged. If a letter fails after your card is charged, you are refunded automatically and in full.
When should a business use this letter?
Use it when a vendor or contractor owes you money — an overpayment you made by mistake, a refund for goods or services that were never delivered or were returned, or a credit you're owed under a contract — and informal follow-up hasn't gotten a response.
Should I send this by certified mail?
Yes. Certified Mail with electronic Return Receipt gives you a dated, trackable record that the vendor received your demand, which matters if you later dispute the charge with your bank, involve an attorney, or file in small claims court.
What if I just want a paper trail without the receipt?
Plain Certified Mail ($12.99) gets you proof of mailing and delivery tracking without the signed return receipt; add electronic Return Receipt ($14.99 total) if you may need a signed USPS delivery record.
Is this legal advice?
No — it is a tool and a template, not legal advice. Whether you can dispute a charge, involve an attorney, or file a claim depends on your contract terms and state law; consider consulting an attorney if the amount is significant.