Mise en demeure (formal demand): letter template and full procedure

Quick answer

A mise en demeure is a formal letter demanding that the recipient perform an obligation (pay, deliver, stop a behaviour) within a stated deadline, usually 8 to 15 days. Sent by registered AR, it triggers the start of statutory interest (article 1344-1 of the French Civil Code) and is the de facto prerequisite to any court action.

You haven't been paid, a neighbour refuses to stop a nuisance, a tradesperson won't finish the job, an employer hasn't paid your final salary? The mise en demeure (formal demand) is the compulsory step before any court action in France. Properly drafted and sent by registered AR, it often resolves the situation without going to court.

1. What is a mise en demeure?

A mise en demeure is a formal letter by which you require the other party to perform an obligation (pay, deliver, finish, stop a behaviour) within a specific deadline.

In law, it has three effects:

• It sets the start date of moratory interest (default interest) on a money debt (article 1344-1 of the Code civil).
• It is the near-mandatory prerequisite to legal action — without it, your claim before the court can be ruled inadmissible.
• It evidences your good faith and the culpable nature of the other party's silence.

2. When to use it

3. Mandatory mentions of a mise en demeure

To produce its legal effects, the letter must contain:

• Your full contact details (first and last name, address, optionally phone number)
• The exact contact details of the recipient
• The date of the letter
• The subject stated clearly: "Mise en demeure de [payer / faire / cesser]…"
• A recap of the facts: date of the contract, date of order, amount invoiced, facts observed…
• The precise demand: what you require (exact amount, exact action)
• The deadline granted to comply (usually 8 to 15 days from receipt)
• The explicit wording: "Failing which, I reserve the right to refer the matter to the competent court and to claim, in addition to the sum due, moratory interest at the legal rate and procedural costs."
• Your signature

⚠️ The words "mise en demeure" must appear in black and white in the letter — without this wording, judges may refuse to qualify it as such.

4. Letter template

Subject: Mise en demeure de payer (formal demand to pay)

Dear Sir or Madam,

Under contract / invoice no. [X] dated [date], you undertook to [pay me the sum of €… / deliver … / complete the works concerning …].

To date, despite [the contractual deadline expired on … / my reminders of … and …], this obligation remains unperformed.

I therefore hereby formally demand that you [pay the sum of €… / perform the obligation described above] within [15] days of receipt of this letter.

Failing which, I will be compelled to refer the matter to the competent court in order to obtain, in addition to compelled performance of your obligation, payment of moratory interest at the legal rate running from receipt of this letter, as well as any sum due in respect of procedural costs (article 700 of the Code of Civil Procedure).

Yours faithfully,

[Date — Signature]

5. Method of delivery: why registered AR is critical

You may legally send a mise en demeure by plain letter, email or even SMS. But in practice, only registered mail with acknowledgement of receipt (LRAR) lets you prove:

• The exact date of receipt by the recipient (which triggers the deadline granted and the moratory interest)
• The identity of the signatory
• The content (via the preserved copy + reference to the letter on the AR slip)

Without LRAR, the recipient can deny having received the formal demand, and the judge will consider that no deadline began to run.

💡 If you are abroad or far away, MaisonMail prints your mise en demeure in France and posts it as LRAR the same day. You receive the tracking number online and the scanned AR as soon as it returns.

6. What to do after sending

1. Carefully keep: the copy of the letter, the dispatch receipt, the signed AR.
2. Wait out the granted deadline. If the recipient complies, the matter is closed.
3. No reply by the deadline? You can then:
   • Refer the matter to the tribunal judiciaire (dispute > €10,000) or the tribunal de proximité (≤ €10,000).
   • Apply for an injonction de payer (fast, low-cost, for undisputed debts).
   • Engage a commissaire de justice (judicial officer) for service of process (reinforced formal demand).

7. Common mistakes

• Not writing "mise en demeure" in the subject or body: the letter may be requalified as a simple reminder.
• No specified deadline: without a precise deadline, no start date for interest or for court action.
• Sending by email: no enforceable proof of receipt.
• Asking for an imprecise sum: demand an exact amount, justified by an invoice or contract.
• Threatening criminal proceedings for a simple unpaid debt: this is an offence (blackmail). Stick to civil remedies.

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Bottom line: a clear, dated, quantified mise en demeure, sent by registered AR, is often enough to obtain payment or performance without going to court. Drafting takes about fifteen minutes — it can save you months of procedure.