When invoices go unpaid, a formal demand letter is the final amicable step before legal proceedings. It formalizes your payment request, establishes the start of late-payment interest, and gives the debtor a last chance to pay. This article provides both a complete guide to writing an effective demand letter and six ready-to-use templates for different situations.
Don’t miss our comprehensive guide on following up on unpaid invoices. We have also prepared other formats of reminder templates.
A demand letter differs fundamentally from a simple email reminder: it carries legal weight, triggers late-payment interest from the date of receipt, and serves as evidence of your good faith before any court. For full legal context, see our article on the legal framework for unpaid invoices in France.
Template 1: Standard Demand for Unpaid Invoice
Objective: To remind the debtor of their payment obligations and prompt them to settle the invoice promptly.
Circumstances: Use this template when a client has not paid an invoice by the due date without providing any explanation.
Sample Letter
Subject: Demand for Payment
Dear [Client’s Name],
We are writing to remind you that, as of today, invoice number [invoice number] totaling [amount] USD, due on [due date], remains unpaid.
We kindly ask you to remit payment within [number] days of receiving this letter. Failure to do so may result in further actions being taken.
We appreciate your prompt attention to this matter and look forward to your cooperation.
Sincerely,
[Your Name][Your Title][Company Name][Contact Information]
Template 2: Demand Following Unfulfilled Payment Promise
Objective: To remind the debtor that they have not honored their payment commitment.
Circumstances: Use this when the client promised to make a payment by a certain date but failed to do so.
Sample Letter
Subject: Reminder of Unfulfilled Payment Promise
Dear [Client’s Name],
Following our agreement dated [date of the agreement], you committed to settling invoice number [invoice number] for [amount] USD by [promised payment date].
To date, we have not received any payment. Please fulfill your commitment within [number] days to avoid any legal actions.
We look forward to resolving this matter amicably.
Sincerely,
[Your Name][Your Title][Company Name][Contact Information]
Template 3: Demand with Mention of Late Payment Interest
Objective: To encourage the debtor to pay quickly by highlighting potential late payment interest.
Circumstances: When you wish to emphasize the financial consequences of delayed payment.
Sample Letter
Subject: Demand for Payment with Late Fees
Dear [Client’s Name],
Despite previous reminders, invoice number [invoice number] amounting to [amount] USD remains unpaid. According to our terms, a late payment interest of [interest rate]% applies from [due date].
Please remit payment within [number] days to prevent additional interest accrual and potential legal actions.
We appreciate your immediate attention to this matter.
Sincerely,
[Your Name][Your Title][Company Name][Contact Information]
Template 4: Demand for Partially Paid Invoice
Objective: To recover the remaining balance on a partially paid invoice.
Circumstances: Use when part of the invoice has been paid, but the full amount is still outstanding.
Sample Letter
Subject: Reminder for Outstanding Balance
Dear [Client’s Name],
We acknowledge receipt of a partial payment of [amount paid] USD for invoice number [invoice number]. However, a balance of [remaining amount] USD is still due.
Please send the remaining payment within [number] days to settle the account.
We appreciate your prompt response to this request.
Sincerely,
[Your Name][Your Title][Company Name][Contact Information]
Template 5: Demand with Threat of Legal Action
Objective: To inform the debtor of potential legal consequences if the payment is not made.
Circumstances: When previous attempts to recover the payment have failed.
Sample Letter
Subject: Final Demand Before Legal Action
Dear [Client’s Name],
Despite our previous communications, invoice number [invoice number] for [amount] USD remains unpaid. Failure to settle this amount within [number] days will result in legal action being taken to recover the debt.
We hope to avoid this course and expect your immediate payment.
Sincerely,
[Your Name][Your Title][Company Name][Contact Information]
Template 6: Amicable Demand Before Collection Agency
Objective: To make a final amicable attempt before engaging a collection agency.
Circumstances: Prior to handing the case over to a debt collection agency.
Sample Letter
Subject: Final Amicable Demand
Dear [Client’s Name],
We remind you that invoice number [invoice number] for [amount] USD has been due since [due date] and remains unpaid.
Before proceeding with a collection agency, we invite you to resolve this matter within [number] days.
We look forward to your cooperation and timely response.
Sincerely,
[Your Name][Your Title][Company Name][Contact Information]
Common Mistakes to Avoid
1. Vague amounts or missing invoice references: Courts require precision. Always state the exact invoice number, original amount, due date, and any accrued interest separately.
2. No deadline specified: Without a clear deadline (typically 8–15 days), there is no pressure to act. Vagueness weakens your legal position.
3. Aggressive or threatening language: Overly aggressive tone can damage negotiations and potentially violate consumer protection or harassment laws. Stay firm, factual, and professional.
4. No proof of delivery: An email demand can be denied. Send by certified mail (return receipt requested) or via a process server to create an undeniable proof of receipt and date.
5. Acting before the deadline expires: Launching legal proceedings before the stated deadline can undermine your case. Always respect the timeline you set.
What to Do After No Response
If the debtor does not respond within the stated deadline, escalate systematically:
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Order for payment (injonction de payer in France): A fast, low-cost procedure (approx. €33 court fee) to obtain an enforcement order for undisputed debts. The debtor has 30 days to file an objection; if they don’t, the order becomes directly executable.
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Legal summons (assignation en paiement): For disputed or high-value debts, this initiates formal court proceedings. More expensive and slower (3–12 months), but allows the judge to rule even if the debtor contests.
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Debt collection agency: For lower-value debts where legal costs would exceed the amount owed, outsourcing to a professional debt collection agency is often the most cost-effective route.
