Formal demand for unpaid invoice
template, process & legal rights

You have sent friendly reminders, waited patiently, and your invoice is still unpaid. The next step in the French debt recovery process is the formal demand -- known as the mise en demeure. This document has real legal power: it starts the clock on interest, proves your diligence to a court, and unlocks your right to pursue judicial proceedings. This guide explains what a mise en demeure is, when to send one, what it must contain, and what comes after.

What is a mise en demeure?

A mise en demeure (formal demand) is a written notice that formally instructs a debtor to fulfill their payment obligation within a specified deadline. Unlike a simple reminder, it has explicit legal effects under French civil law. The term mise en demeure must appear in the document itself -- using phrases like "reminder" or "follow-up" does not produce the same legal consequences.

The legal foundation is Article 1344 of the French Civil Code, which states that a debtor is placed in default either by a mise en demeure or by an equivalent act. Once in default, the debtor becomes liable for damages caused by the delay, and statutory interest begins to run automatically.

In practical terms, the mise en demeure serves three purposes: it constitutes formal proof that you have attempted amicable resolution, it triggers financial consequences for the debtor, and it satisfies the procedural prerequisite for most judicial recovery actions.

When should you send a formal demand?

The mise en demeure typically comes after one or two friendly reminders have gone unanswered. A common timeline is:

• Day +7 after due date: first friendly reminder by email.
• Day +15: second reminder, firmer tone, mentioning late-payment penalties.
• Day +30: formal demand (mise en demeure) sent by registered mail.
• Day +45 to +60: if still unpaid, initiate legal proceedings.

There is no legal requirement to wait a specific number of days before sending a mise en demeure. Technically, you can send one the day after the due date. However, courts tend to view a graduated approach favorably -- it demonstrates good faith and a genuine effort to resolve the matter amicably before escalating.

You should send a mise en demeure when:

• Friendly reminders have been ignored or rejected.
• The debtor is unresponsive or disputes the invoice without valid grounds.
• The amount at stake justifies the cost of registered mail (around 5 to 7 euros).
• You are seriously considering legal action and need the procedural prerequisite.

Legal effects of the formal demand

The mise en demeure produces several important legal effects:

• Interest runs from the date of receipt. Under Article 1344-1 of the Civil Code, statutory late-payment interest begins on the date the debtor receives the mise en demeure. For B2B invoices, the minimum rate is three times the legal interest rate (currently resulting in an effective rate of approximately 12.51% per year). In addition, a fixed 40-euro recovery indemnity is owed automatically under Article D441-5 of the Commercial Code.
• Risk transfer. If the debtor was holding goods that are destroyed or damaged after receiving the mise en demeure, the loss falls on them, not on the creditor.
• Prerequisite for legal action. Most judicial recovery procedures -- including the injonction de payer (payment order), saisie-attribution (bank seizure), and damages claims -- require proof that a mise en demeure was sent and received.
• Evidence of diligence. In any subsequent court proceeding, the mise en demeure demonstrates that you attempted to resolve the dispute before resorting to judicial intervention.

Required content of a formal demand

For the mise en demeure to be legally valid and effective, it must include the following elements:

• The words "mise en demeure" clearly stated in the subject line and the body of the letter. Without this explicit mention, the document may be treated as a simple reminder without legal effect.
• Identification of both parties: your full name or business name, address, SIRET number, and the debtor's full name or business name and address.
• Precise description of the debt: invoice number(s), date(s), amount(s), original due date(s), and any late-payment penalties already accrued.
• A clear payment deadline: typically 8 to 15 calendar days from receipt of the letter. The deadline must be reasonable -- courts may disregard demands with unreasonably short deadlines (e.g., 24 hours).
• Mention of legal consequences: state that if payment is not received within the deadline, you will initiate legal proceedings (injonction de payer, tribunal action, etc.) without further notice.
• Reference to applicable law: cite Article 1344 of the Civil Code and, for B2B debts, Articles L441-10 and D441-5 of the Commercial Code regarding late-payment penalties and the recovery indemnity.
• Date and signature.

Free formal demand template

Below is a complete, ready-to-use template that you can adapt to your situation. Replace the bracketed fields with your own information.

How to send the formal demand

The method of sending is crucial for the legal effectiveness of your mise en demeure:

• Registered mail with acknowledgment of receipt (LRAR): this is the gold standard and the strongly recommended method. The acknowledgment of receipt (accuse de reception) provides irrefutable proof that the debtor received the letter and on what date. This proof is essential for any subsequent court proceedings. You can send LRAR from any post office or online via La Poste's website.
• Delivery by a commissaire de justice (huissier): for high-value debts or particularly difficult debtors, you can have the mise en demeure served by a commissaire de justice. This provides the strongest possible proof of delivery and carries significant psychological impact. The cost is typically 50 to 150 euros, depending on the location.
• Registered electronic mail (LRE): since the EIDAS regulation and French Decree no. 2018-347, a registered electronic letter sent through a certified platform has the same legal value as physical LRAR. Services like AR24 offer this option, which is faster and often cheaper than postal LRAR.

Important: a mise en demeure sent by standard email, regular post, or SMS does not have the same evidentiary strength. While it may still constitute a valid demand in theory, proving that the debtor received it becomes difficult, which significantly weakens your position.

After the formal demand: next steps

Once the deadline in your mise en demeure has expired without payment, you have several options:

• Injonction de payer (payment order): this is the most common judicial procedure for unpaid invoices. You file a request with the competent court (tribunal judiciaire for B2C, tribunal de commerce for B2B), attaching your mise en demeure, proof of delivery, the unpaid invoice(s), and evidence of the commercial relationship. The judge can issue a payment order without a hearing. For debts under 5,000 euros, a simplified online procedure exists through the Infogreffe platform. Court fees are modest: around 33.47 euros for the tribunal de commerce.
• Procedure de recouvrement simplifie (simplified recovery): for debts under 5,000 euros, you can ask a commissaire de justice to initiate a simplified recovery procedure. This does not require going to court -- the commissaire de justice contacts the debtor directly and proposes a payment plan. If the debtor accepts, the commissaire issues an enforceable title.
• Debt collection agency: you can engage a professional debt collection agency (societe de recouvrement) to pursue amicable recovery on your behalf. They typically charge 10% to 25% of the recovered amount, with no upfront fee. This option is useful when you lack the time or inclination to manage the recovery yourself.
• Full court proceedings: for disputed debts or high-value claims, you may need to bring a full action (assignation) before the tribunal. This is more expensive and time-consuming but allows you to claim additional damages beyond the original invoice amount.

Special cases and tips

• Multiple unpaid invoices: you can include multiple invoices in a single mise en demeure. List each invoice separately with its number, date, amount, and due date. Calculate interest and penalties for each invoice individually.
• Debtor in financial difficulty: if you suspect the debtor is insolvent or in redressement judiciaire (judicial recovery), you must declare your debt to the court-appointed administrator within two months of the judgment opening. The mise en demeure alone will not suffice.
• Statute of limitations: for B2B debts, the limitation period is 5 years from the due date (Article L110-4, Commercial Code). For B2C debts, it is 2 years (Article L218-2, Consumer Code). A mise en demeure does not interrupt the limitation period -- only a court action or the debtor's acknowledgment of the debt does.
• Preserve the relationship: even a formal demand can be written in a professional, non-aggressive tone. Emphasize the facts and the legal framework rather than making personal accusations. Many business relationships survive a mise en demeure when both parties act professionally.

Frequently asked questions

Is a mise en demeure mandatory before going to court?

For most judicial recovery procedures in France, yes. The injonction de payer (payment order) requires proof that you attempted to collect the debt amicably before filing. The mise en demeure serves as that proof. Some procedures, such as the simplified recovery for debts under 5,000 euros, do not strictly require a prior mise en demeure, but sending one significantly strengthens your case.

What is the legal deadline to pay after receiving a mise en demeure?

There is no statutory deadline -- you set the deadline yourself in the letter. The standard practice is 8 to 15 calendar days from receipt. The deadline must be reasonable: too short (e.g., 24 hours) and a court may consider the demand abusive; too long (e.g., 90 days) and you unnecessarily delay your own recovery. Eight days is the most commonly used and judicially accepted deadline.

Does a mise en demeure stop the statute of limitations?

No. Under French law, a mise en demeure does not interrupt or suspend the statute of limitations. Only two events can interrupt it: the initiation of court proceedings (acte de poursuite) or the debtor's formal acknowledgment of the debt. This means you should not rely on the mise en demeure to buy time -- if the limitation period is approaching, file a court action promptly.

Can I send a mise en demeure by email?

A standard email does not carry the same evidentiary weight as an LRAR. However, a lettre recommandee electronique (LRE) sent through a certified platform (such as AR24) has the same legal value as physical registered mail since Decree no. 2018-347. If you send by standard email, the debtor can claim they never received it, which weakens your position in court.

How much does it cost to send a formal demand?

A physical LRAR costs approximately 5 to 7 euros at La Poste. A certified electronic letter (LRE) costs 3 to 5 euros depending on the platform. If you choose to have the demand served by a commissaire de justice, the cost is typically 50 to 150 euros. These costs can be recovered from the debtor as part of any subsequent legal proceedings.