A Child Maintenance Service (CMS) assessment may look like a routine United Kingdom calculation, but it becomes a cross-border legal file when the paying parent, the receiving parent or the child lives in France. The practical question is not simply whether money is overdue. It is whether the assessment qualifies as a decision that France can recognise, which authority must transmit the application, how arrears must be proved, and which French enforcement measure can lawfully be used.

In France, child maintenance is generally called a pension alimentaire, meaning a payment towards a child’s maintenance and education. Brexit did not extinguish a CMS liability, but it changed the cooperation framework for new France–UK applications. The 2007 Hague Convention on the International Recovery of Child Support and Other Forms of Family Maintenance is now central to many cases, while the United Kingdom’s own guidance distinguishes England and Wales from Scotland and Northern Ireland.

This article focuses on the CMS assessment rather than a French property purchase, company creation or a general divorce overview. It explains the difference between an administrative assessment and a court order, the role of the French RCA and the English and Welsh MEBC, the evidence needed for recognition, and the steps available to a creditor or debtor. The decisive principle is simple: classify the document first, then choose the enforcement route.

I. Can a UK Child Maintenance Service assessment be recognised in France after Brexit?

A. What is a CMS assessment and why is it different from a UK court order?

The CMS is an administrative service, not a court. It can calculate child maintenance, record the amount due, collect payments in a case using its collection service and take steps under United Kingdom legislation when a liable parent does not pay. A CMS notice is therefore different from an order made by a judge in England and Wales. The distinction matters because a French authority must identify the legal nature of the document before it can treat the amount as an enforceable foreign maintenance obligation.

The underlying family obligation is not in doubt merely because the calculation came from an administrator. Article 371-2 of the French Civil Code provides: Chacun des parents contribue à l’entretien et à l’éducation des enfants à proportion de ses ressources, de celles de l’autre parent, ainsi que des besoins de l’enfant. In practical terms, both parents contribute according to their resources, the other parent’s resources and the child’s needs. That principle helps explain the nature of the claim, but it does not turn every CMS letter into a French enforcement title.

French law also shows why the form of the instrument must be identified. Article 373-2-2 of the Civil Code states that, after separation, la contribution à son entretien et à son éducation prend la forme d’une pension alimentaire. It lists several ways in which the contribution may be fixed, including a judicial decision, an agreement approved by a judge, a divorce agreement, a notarial deed and certain enforceable agreements. The list is useful by analogy, but the French court will still have to apply the international instrument and French procedural rules to the particular UK document.

A CMS assessment should be read as a complete administrative record. The creditor should not send only the page showing the weekly or monthly figure. The receiving authority may need the original assessment, the case reference, the date from which liability began, the legislation or regulations relied upon, the collection status, review decisions and evidence that the assessment remains in force. If the CMS has recalculated the amount, the file must show which assessment replaced the earlier one. If a liability order or another enforcement step was issued in the United Kingdom, it should be included and clearly distinguished from the underlying CMS calculation.

The same caution applies to a CMS decision that has been challenged. A mandatory reconsideration, appeal, administrative review or change-of-circumstances application may affect the amount or the period for which arrears can be claimed. A French authority cannot sensibly enforce an assessment that has been superseded, suspended or reduced without seeing the later decision. The bundle should therefore contain a chronological schedule: assessment date, effective date, review date, variation date, payment date and the balance after each event.

The 2007 Hague Convention uses the concept of a decision rendered by a judicial or administrative authority. Its Article 19 definition of an administrative authority is important for a CMS file: the body must be public, its decision must be capable of appeal or review by a judicial authority, and the decision must have a similar force and effect to a judicial decision on the same matter. A CMS assessment may satisfy that definition, but the applicant should present the evidence that allows the requested authority to make the classification. The conclusion cannot be based only on the words “Child Maintenance Service” at the top of a letter.

This is why a French authority may ask for proof of the CMS appeal route, the date on which the assessment became final or enforceable, and the procedural notices sent to the paying parent. The question is not whether the debtor accepts the calculation. It is whether the assessment was made by the relevant public body, under a process that allowed review, and remains legally effective. A creditor who supplies those facts at the start is more likely to avoid an avoidable request for further documents.

The child’s age also matters. Article 2 of the Convention covers maintenance obligations arising from a parent-child relationship towards a person under 21, subject to the declarations and reservations made by the States concerned. A CMS case involving a child approaching 18, 19 or 20 therefore requires a specific check of the assessment, the applicable United Kingdom rules and any extension of liability. The date of birth should be stated in the application, and the arrears schedule should identify the legal basis for every instalment after the child reaches a new age threshold.

A CMS assessment must also be kept separate from issues of contact or parental responsibility. A child arrangements order regulates where a child lives or spends time; it does not automatically determine the amount of maintenance. A parent cannot normally stop paying because contact has been restricted, and a parent cannot normally condition payment on seeing the child. If both disputes exist, the CMS and maintenance file should identify the contact issue without allowing it to obscure the assessment, the arrears and the applicable review route.

Finally, the assessment may be only one part of a wider United Kingdom file. The parents may have a court order, a consent order, a private agreement and a CMS calculation covering different periods. Those instruments should not be merged into a single unexplained total. A French authority needs to know which amount is claimed under which document, which body can vary it, and whether two instruments overlap. The safest presentation is a table that ties each instalment to one operative source.

B. Which post-Brexit route connects the CMS, the RCA and French authorities?

Brexit changed the date-sensitive analysis. The GOV.UK guidance on UK–EU cross-border maintenance disputes explains that EU family-proceeding rules stopped applying to the United Kingdom from 11 p.m. on 31 December 2020. It distinguishes cases that were already underway or protected by transitional arrangements from new or further applications. The relevant date is not simply the date on which one parent crossed the Channel. The file should record when the assessment was made, when proceedings started, when it became enforceable and when the residence change occurred.

For many new France–UK cases, the 2007 Hague Convention supplies the cooperation framework. The GOV.UK guidance for legal professionals identifies that Convention as the route used with EU States, apart from Denmark, for many maintenance disputes after the change in the European rules. That does not mean that a CMS assessment is automatically executable in France. It means that the applicant should assess the Convention’s scope, the administrative nature of the decision and the central-authority process rather than treating the case as an ordinary unpaid invoice.

The direction of the application determines the starting point. If the creditor and child live in France and the debtor is in England or Wales, France is generally the requesting State and the United Kingdom is generally the requested State. If the debtor lives in France and the creditor seeks enforcement there, the United Kingdom is generally the requesting State and France is the requested State. Article 9 of the Convention uses the Central Authority of the State in which the applicant resides for the international application. The wrong direction can delay a file even when the underlying assessment is sound.

For a creditor resident in France, the French Ministry for Europe and Foreign Affairs identifies the Bureau du recouvrement des créances alimentaires, or RCA, as the French Central Authority for recovery abroad. The RCA can orient the creditor, transmit the application and explain which documents are needed. The Ministry’s service is not a substitute for the French family court where both parents and the child are in France and the case is domestic. A British parent should state the actual residence of every relevant person instead of assuming that a British nationality makes the case international.

For an applicant using the England and Wales route, the GOV.UK guidance for a parent living abroad directs the applicant to the Maintenance Enforcement Business Centre, usually called the MEBC. The MEBC checks eligibility, provides an application form and supporting guidance, and sends the completed application to the court in the country where the other parent lives. This is different from the CMS’s ordinary domestic administration. The applicant should explain whether the assessment was collected by the CMS, paid privately or already the subject of a United Kingdom enforcement step.

GOV.UK also warns that the England and Wales guidance does not cover every UK legal system. A CMS or court file connected with Scotland or Northern Ireland must be checked through the authority for the relevant system. “UK assessment” is not precise enough if it conceals a Scottish or Northern Irish procedure. The originating country, the court or public body, the currency and the address of the responsible authority should appear on the first page of the evidence bundle.

The application should distinguish transmission, recognition and enforcement. Transmission is the movement of the application through the Central Authorities. Recognition is the legal acceptance of the assessment or related decision in the requested State. Enforcement is the later use of a French measure, such as direct payment or seizure. These are connected but not interchangeable. A Central Authority can help move documents and obtain information, but it does not replace a court where a judicial declaration, a variation or an objection must be decided.

Translation and legalisation create another common source of error. Article 41 of the Convention states: No legalisation or similar formality may be required in the context of this Convention. The absence of a legalisation requirement does not remove the need for an intelligible, complete and properly translated file. Article 44 addresses language and translations. A creditor sending a CMS file to France should expect the French authority to ask for French material, unless it accepts an exception. A creditor sending a French enforcement file to England and Wales should confirm whether English translations are required. The RCA or MEBC should be asked before a translation is commissioned in the wrong format.

A sensible post-Brexit route can be summarised as follows:

1. identify the CMS assessment, the originating UK legal system and every later review or variation;
2. confirm where the creditor, debtor and child live, and whether the case is covered by a transitional rule or the 2007 Convention;
3. contact the appropriate Central Authority rather than sending an informal demand to a French bank or employer;
4. prepare the complete decision, enforceability evidence, service material, identity documents and arrears schedule;
5. answer any recognition notice within the stated period; and
6. only after recognition, request the French enforcement measure that matches the debtor’s assets and the amount due.

This sequence is particularly important when the CMS has calculated the amount but the debtor has moved several times. The applicant should give the last known French address, employer, bank information and any lawful locating details to the Central Authority. The Convention allows cooperation to locate a debtor and facilitate recovery, but an incomplete address can still produce delay. The application should also flag any safety concern so that sensitive address information is handled through the authority’s confidentiality process.

II. How can a British parent prove, enforce or challenge a CMS assessment in France?

A. Which documents and French enforcement measures should a creditor prepare?

A creditor’s first task is to transform the CMS history into an enforceable evidence bundle. A French decision-maker should be able to answer five questions without reconstructing the case from emails: what document fixes liability, when did it take effect, was it open to review, what was due on each date, and what remains unpaid? The bundle should use page numbers, a chronology and a short explanation of any change in currency or calculation.

The core documents normally include:

1. the complete CMS assessment, including schedules, calculation pages and the case reference;
2. the notice showing when the assessment took effect and the period covered;
3. any mandatory reconsideration, appeal, variation, superseding assessment, liability order or collection decision;
4. evidence that the assessment remains effective and enforceable in the United Kingdom;
5. proof of notice to the paying parent and evidence of the opportunity to challenge the assessment;
6. a month-by-month ledger showing the amount due, currency, payment received, payment date, exchange-rate method and balance;
7. the child’s birth certificate or other identity evidence and documents showing the parent-child relationship if requested;
8. the creditor’s bank details, safe-contact instructions and the debtor’s last known addresses, employer and assets where lawfully known; and
9. the forms, translations and powers of attorney required by the requesting and requested Central Authorities.

Article 25 of the Convention gives the logic behind this list. Recognition and enforcement applications require the complete text of the decision, proof that it is enforceable in the State of origin, evidence concerning notice where the respondent was absent, and information about the amount of arrears and the date on which the calculation was made. Article 11 requires information about the parties, the child, the grounds of the application, the payment destination and, where available, the debtor’s location, employer and assets. The CMS case reference should be repeated on every major document.

A payment ledger should not be a single unexplained spreadsheet. Each line should identify whether the amount was assessed, collected by the CMS, paid directly to the other parent, returned by a bank or credited against a previous balance. If the assessment is in pounds and enforcement is sought in France, the ledger should show the conversion methodology and the date used. If the debtor says that a payment was made in cash, the creditor should record the assertion and the evidence supporting or contradicting it rather than silently deleting the instalment.

The French recognition framework must also be understood. Article 509 of the French Code of Civil Procedure provides that foreign judgments are enforceable in France in the manner and cases provided by law. Article L.111-3 of the Code of Civil Enforcement Procedures lists enforceable instruments and includes Les actes et les jugements étrangers ainsi que les sentences arbitrales déclarés exécutoires. The Convention’s special recognition route and French internal enforcement law therefore work together: the international route gets the assessment recognised, and French procedure governs the measure used against assets in France.

A recognition notice must be treated as a deadline document. Article 23 of the Convention provides a route to declare a decision enforceable or register it for enforcement. A challenge is normally subject to a 30-day period after notification, extended to 60 days where the contesting party is not resident in the State in which recognition or registration took place. The precise notice and applicable procedural law must be checked. A creditor should not assume that a debtor’s silence is a harmless delay, and a debtor should not assume that an informal email to the CMS suspends the French period.

The grounds of challenge are limited and should be identified with precision. They can include public policy, fraud in a proceeding, an incompatible decision or proceeding, defective notice in a default case, a jurisdictional problem, an authenticity or integrity problem in the documents and proof that past arrears were paid. A disagreement with the CMS calculation may need to be addressed through the United Kingdom review or variation mechanism rather than through a French recognition objection. The application should explain which issue belongs to which authority.

Once the assessment has been recognised, French enforcement can be selected according to the debtor’s income and assets. Article L. 213-1 of the Code of Civil Enforcement Procedures begins: Tout créancier d’une pension alimentaire peut se faire payer directement. Direct payment may be sought from a third party who owes money to the debtor, subject to the statutory conditions. Depending on the evidence, that third party may be an employer, a bank or another holder of liquid and payable sums. A French commissaire de justice, meaning a judicial officer, handles the measure and needs the recognised title and a reliable arrears calculation.

Other measures may include seizure of bank funds, attachment of earnings, seizure and sale of assets or recovery through a public body where the legal conditions are met. A creditor should not demand every measure at once. The better approach is to identify the debtor’s current French employer or bank, check whether the income is regular, confirm the amount protected from seizure and select a proportionate route. Speculative allegations about hidden accounts can weaken the application and create an avoidable dispute about personal data.

French financial intermediation may be relevant where the legal conditions are satisfied. The system known as intermédiation financière uses the family-benefits bodies to receive maintenance from the debtor and transfer it to the creditor. Article L.582-1 of the Social Security Code states that the relevant bodies are responsible for intermediation for the maintenance payments covered by Article 373-2-2 and provides for recovery after a default in the circumstances defined by the legislation. The official Service-Public guidance on financial intermediation should be checked for eligibility, especially where the underlying assessment was made abroad.

Do not confuse intermediation with recognition. A French family-benefits body may be able to collect an enforceable maintenance amount, but it does not necessarily decide whether a CMS assessment satisfies the Convention’s requirements. The creditor should first identify the title and the recognition decision, then ask whether the recognised amount can enter the French intermediation system. If the CMS has changed the amount, the updated decision should be sent before the French schedule is opened.

Arrears also require a limitation analysis. Article 2224 of the French Civil Code provides that personal actions generally prescribe after five years from the day when the right-holder knew or should have known the facts allowing the action. Article L.111-4 of the Code of Civil Enforcement Procedures addresses the period during which enforcement of specified enforceable titles may be pursued. These provisions should not be applied mechanically to a CMS file without considering the originating law, the Convention and the precise nature of each instalment.

A recent French decision provides a useful domestic warning. In First Civil Chamber judgment No. 25-14.686 of 20 May 2026, the Court referred to recovery tant pour le passé, dans la limite des cinq années précédant l’introduction de l’instance, que pour l’avenir. The decision concerns the parent-child maintenance obligation under French law, not automatic recognition of a CMS assessment. Its practical lesson is that an arrears claim must state the period sought and the legal reason for including each old instalment. If the creditor omits that explanation, the debtor may challenge the calculation even when the underlying assessment is valid.

There can also be a criminal dimension, but it is not a substitute for recognition. Article 227-3 of the French Criminal Code concerns failure to pay an obligation fixed by a judicial decision or another enforceable title for more than two months. It describes the period as en demeurant plus de deux mois sans s’acquitter intégralement de cette obligation and provides for two years’ imprisonment and a €15,000 fine. A complaint requires careful proof of the operative title, notice, amount due and deliberate non-payment. It does not make an unrecognised CMS letter enforceable by itself.

In Criminal Chamber judgment No. 09-84.128 of 6 January 2010, the case concerned a debtor living in Great Britain and proceedings for abandonment of family. The official text records the lower court’s statement that le versement des pensions alimentaires ne peut être subordonné par le débiteur à l’exercice du droit de visite et d’hébergement. The Court of Cassation ultimately quashed the conviction for a separate procedural reason. The decision should not be presented as a current France–UK recognition ruling, but it reinforces the need to keep maintenance payment and contact rights legally separate.

The creditor should retain the original CMS documents, not only downloaded screenshots. Preserve the email headers, payment confirmations, bank statements, collection notices and any letter explaining a returned payment. If a French judicial officer asks for a calculation, send a signed or clearly attributed schedule with the source of every figure. Cross-border enforcement becomes slower when the creditor’s own papers use three different totals for the same period.

B. How can a debtor challenge the assessment, arrears or payment process?

A debtor who receives a French recognition notice or enforcement act should read the operative document before arguing about the history. The first questions are: which CMS assessment is relied upon, which period is claimed, when was the notice served, and what deadline applies? The debtor should save the envelope or electronic delivery record, because the service date may determine the period for a challenge. A complaint to the CMS and an objection before a French enforcement judge are not automatically interchangeable.

The recognition challenge should be framed around a recognised ground. If the debtor was never notified of the United Kingdom proceedings and had no opportunity to be heard, collect the address history, service documents and evidence of the date on which the assessment became known. If the debtor has already paid, identify the payment date, amount, account and reference. If a later CMS assessment replaced the one sent to France, produce the superseding document and explain the effective date. A general statement that the amount “looks wrong” will rarely resolve a recognition question.

Payment evidence must be specific. A transfer to a former partner may have covered rent, school expenses, a loan or child maintenance. The bank reference, surrounding correspondence and amount should be used to show what the transfer was intended to pay. Where payment was made in pounds and the CMS record is in another currency, the debtor should calculate the conversion rather than rely on a bank’s unexplained display. If the receiving parent or the CMS returned a payment, retain the return notice and show whether a replacement payment was offered.

The debtor should also check whether the CMS assessment is still operative. The assessment may have been recalculated following a change in income, a child leaving education, a change in shared care or a decision on mandatory reconsideration. A French court considering recognition needs the assessment that was legally effective for the period claimed. A debtor should ask the CMS for the full case history and the exact document that superseded any earlier amount, then provide it to the French authority before a seizure is implemented.

A change in financial circumstances normally calls for a variation or review through the authority that can alter the CMS liability. Redundancy, retirement, serious illness, disability, a new dependent child, a durable fall in income or a material change in shared care may be relevant, depending on the applicable United Kingdom rules. Gather payslips, tax returns, benefit records, employment documents, medical evidence where appropriate and a realistic budget. Do not present a temporary delay in payment as if it automatically changed the assessment.

The debtor should continue communicating while the review is pending. Paying what is due under the operative assessment, or paying an amount clearly identified as a temporary payment on account, does not automatically reduce the debt. It can nevertheless prevent the ledger from becoming more difficult to reconstruct. Any proposed arrangement should be recorded in writing and should not be described as a variation unless the competent authority has actually varied the assessment.

Contact disputes must remain separate. The French courts have repeatedly treated the maintenance obligation as distinct from the exercise of visiting rights, and the reasoning recorded in judgment No. 09-84.128 states that payment cannot be made conditional on contact. If the debtor says the other parent has prevented visits, that issue should be raised through the parental-responsibility or child-arrangements route. Stopping maintenance is not a safe way to obtain contact and can increase both civil arrears and criminal risk.

If a French commissaire de justice starts direct payment or seizure, read the measure’s title, amount and objection instructions. Article L. 213-1 concerns direct payment, while another enforcement act may be governed by a different procedure. A challenge about the existence or amount of the debt may not be decided in the same way as a challenge about how the measure was carried out. Send the enforcement officer a concise ledger and obtain advice on the competent juge de l’exécution, meaning the French enforcement judge, and the deadline.

Financial intermediation can create a separate reconciliation problem. In First Civil Chamber judgment No. 24-15.373 of 15 April 2026, the Court considered the principle described in the decision as la mise en place systématique et obligatoire de l’intermédiation financière des pensions alimentaires, subject to statutory exceptions. The case is a reminder that a debtor must identify the period covered by intermediation, the recipient of each payment and the legal status of the title. It is not a basis for saying that every CMS assessment automatically enters the French system.

When the debtor paid the receiving parent directly after an intermediary was appointed, the evidence should show whether the payment discharged the operative obligation or was made to the wrong recipient. Compare the CMS or French intermediary statement with the bank record. If a payment was made to the intermediary but was not credited, request a correction promptly and keep the complaint reference. If the debtor disputes the appointment itself, the challenge should identify the statutory reason and the authority with power to decide it.

Safety and privacy should be addressed early. Article 40 of the Convention allows an authority not to disclose or confirm information where disclosure could endanger a person’s health, safety or liberty. A debtor who is concerned about receiving the creditor’s address should not withhold every locating detail from the authority. Instead, the application or response should mark the sensitive information and ask how it will be handled. A creditor facing domestic abuse should tell the RCA or MEBC before sending documents, rather than assuming that an ordinary email is confidential.

Jurisdiction and variation require separate analysis. A debtor living in France may want the CMS assessment reduced, but that does not mean a French enforcement objection is the right application. The relevant questions include where the original proceedings took place, where the child and creditor habitually lived when the assessment was made, which legal system governs the CMS decision and whether the Convention restricts a new modification proceeding. The request should be addressed to the body with power to vary the assessment, while the French authority is told that a variation has been sought.

Do not wait until a bank account is frozen to assemble the file. A debtor who has moved from the United Kingdom to France should update the CMS, keep proof of the new address, report a relevant income change and preserve documents showing the date of the move. A creditor should likewise notify the authority if the debtor returns to the United Kingdom, changes employer or starts receiving a pension. A cross-border case is easier to correct while it is still at the information stage than after several enforcement measures have been taken.

The Convention also addresses access to justice. Articles 14 and 15 concern effective access to procedures and legal assistance for many child-maintenance applications, subject to the Convention’s conditions. A British parent in France should ask the RCA, MEBC or competent court how legal aid is assessed in the particular application. Assistance may depend on the type of claim, the child’s age, financial circumstances and the requested relief. It is not automatically a promise that every private solicitor’s invoice will be reimbursed.

A final review should test the file against the intended outcome. If the creditor wants arrears, the ledger must show the arrears and the legal basis for the period. If the creditor wants future collection, the assessment and its current amount must be operative. If the debtor wants a reduction, evidence of the changed circumstances and the correct variation request must be ready. If either parent challenges recognition, the objection must be linked to a Convention ground and filed before the applicable deadline. This discipline prevents one broad complaint from obscuring three different legal questions.

Conclusion

A UK Child Maintenance Service assessment can potentially be used in France after Brexit, but its administrative label is not enough. The assessment must be classified, its enforceability and review history established, and the correct France–UK cooperation route selected. The RCA and MEBC can transmit and support applications, while recognition and enforcement decisions remain governed by the applicable international and domestic rules.

For a creditor, the critical evidence is the complete CMS file, service and enforceability material, a transparent arrears ledger, translations and reliable information about the debtor. For a debtor, the critical actions are to preserve the notice date, prove payments, challenge recognition on a recognised ground where appropriate and request a variation from the authority that can change the assessment. Contact and maintenance are separate obligations.

A well-organised cross-border file should make the decision, the period, the amount and the requested measure immediately clear. That is the best way to prevent a valid CMS assessment being delayed by missing documents, and to prevent an incorrect or outdated assessment being enforced without a proper review.

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