Has HM Revenue & Customs (HMRC) stopped your UK Child Benefit after you moved to France? The payment may have been interrupted because an overseas-residence check, travel data, a National Insurance record or a family-change report no longer matches the information held by the Child Benefit Office. Since August 2025, the United Kingdom has publicly announced a wider programme using international travel data to identify claims that may continue after a claimant has left the country. A stopped payment is not, by itself, proof that you made a fraudulent claim. It is a decision that must be tested against the precise facts, the date of your move, the place where your child lives and any rights preserved by the Withdrawal Agreement.

This article focuses on a British person living in France who wants to retain, restore or challenge a UK Child Benefit award after Brexit. It separates the UK benefit from French family benefits paid by the Caisse d’allocations familiales (CAF), the French family-benefits fund. It also explains why a French residence permit, a CAF claim or a French tax return does not automatically decide the HMRC question. The essential work is to reconstruct the cross-border timeline, identify the legal route that applies, assemble the evidence and protect the appeal deadline. The French property purchase process and company formation are outside this article.

I. Why did HMRC stop my UK Child Benefit after I moved to France?

A. Can I keep UK Child Benefit in France after Brexit?

The first question is not whether you are British. It is whether the conditions for entitlement to Child Benefit were still satisfied during the weeks for which HMRC stopped or recovered payment. Nationality may form part of the background, but the decisive facts normally include the claimant’s location, the child’s location, the claimant’s work or contribution position, the date on which the family moved and whether a specific international arrangement preserves coordination.

The statutory starting point is section 146 of the Social Security Contributions and Benefits Act 1992. The official legislation provides a general rule for persons outside Great Britain and gives the regulation-making power that allows specific overseas situations to be treated differently. The current text is available in the official Social Security Contributions and Benefits Act 1992. The Child Benefit Office therefore cannot decide a French case by applying a single slogan such as “you left the UK”. It must apply the statutory residence rule together with the regulations and any applicable international coordination rule.

HMRC’s own Child Benefit Technical Manual states the general rule in precise terms: “The general rule is that to be entitled to Child Benefit, the person claiming and the child/ren or qualifying young person/s they are claiming for must live in the United Kingdom.” The manual is an official explanation, not a substitute for the legislation, but it is useful when analysing the reason in a decision letter. It also records that short absences for holidays or business do not automatically end entitlement and that some people may qualify even when the claimant or child does not live in the United Kingdom. See HMRC’s Child Benefit Technical Manual on residence.

The eight-week rule is often the immediate trigger for a stop. The official guidance says that the Child Benefit Office must be told if you go abroad for more than eight weeks. It distinguishes ordinary temporary absence from a family that has actually moved its life abroad. A holiday, a hospital stay or a family bereavement may have a different treatment from an open-ended relocation. Keep the dates rather than describing every absence as “living in France”. A precise travel chronology can show that a rule for a temporary absence was applied to the wrong period, or that a longer move was not reported at the correct time.

The exception most relevant to a British family in France is the Withdrawal Agreement. In this context, “Withdrawal Agreement” means the arrangements preserving certain rights of people who were already in a cross-border situation when the United Kingdom left the European Union. The UK guidance says that a person who moved to an EU country before 1 January 2021, or who is covered by another condition of the Agreement, might continue to receive Child Benefit for children living with them. It identifies two important routes: the person may be liable to keep paying UK National Insurance and be employed or self-employed, or the person may receive one of the listed contributory benefits, including the UK State Pension. The word “might” matters. A Withdrawal Agreement Residence Permit, or WARP, is evidence of the protected residence position; it is not, without more, a cheque for Child Benefit.

A WARP is the French carte or titre de séjour issued under the agreement protecting qualifying British citizens in France. The current British government guidance describes it as a “Withdrawal Agreement Residence Permit” and explains that a British citizen who moved to France before 1 January 2021 and has lived there legally since then has rights under the Agreement. Read the residence evidence together with the benefit evidence. A WARP can support the date and legality of residence, while National Insurance records, employment documents or a State Pension award can address the social-security connection required for the benefit.

The child’s situation must be analysed separately. The claimant may live in France while the child lives in France, or one parent may remain in the United Kingdom with the child while the other parent lives in France. A child who attends school in England during term time, a child who lives with the other parent, a child who spends alternating weeks in both countries and a child who has moved permanently to France produce different factual questions. The payment record should show who is responsible for the child during each relevant week, where the child actually lives and whether another person has claimed for the same child.

The official overseas guidance addresses the two-country family directly. Where parents live in different countries, the country in which the child lives will usually pay the benefit, and the other country may pay an additional amount if its benefit is higher. That is a priority and differential calculation, not a promise that both countries will pay the full benefit. If HMRC stopped your award because your partner claimed a French or UK payment, the challenge should identify which institution is primary, what amount was paid and why any difference should be due. A bare assertion that “France should pay” does not answer whether the UK award was lawfully stopped.

For families protected by the Withdrawal Agreement, the date 31 December 2020 is a legal dividing line, but it is not the only date. Prepare a chronology showing when the claimant moved, when the child moved, when employment began or ended, when UK National Insurance liability changed, when the French residence document was obtained and when the first stop notice arrived. A family that lived in France before the dividing date may still face a document or contribution dispute. A family that first moved after that date may have to rely on a different domestic or treaty route rather than treating pre-2021 rights as automatic.

The UK government’s France guidance confirms the relationship between residence documentation and protected rights. It says that people who moved to France before 1 January 2021 and have lived there legally since then have rights under the Withdrawal Agreement, and it explains the WARP evidence. It also directs British residents to the UK guidance on claiming benefits abroad, including Child Benefit. Keep the relevant pages with the decision file because the practical question is usually whether your facts fit the protected category, not whether “Brexit” appears in the letter. The official reference is GOV.UK guidance on living in France.

There are also ordinary Child Benefit conditions that do not disappear because a family has an international connection. The child must remain a child or qualifying young person under the applicable rules; the claimant must be the person responsible for the child; an overlapping award may affect who is paid; and a change in education, employment or household circumstances can affect a qualifying young person. A decision that cites only “living abroad” may be incomplete if you supplied facts showing a protected cross-border situation. A decision that cites a protected status but ignores the child’s actual residence may also be wrong.

HMRC’s August 2025 announcement explains why many families are now receiving questions or stops. The government said its programme would use international travel data to identify claims that might continue after a claimant had gone overseas. It reported that a pilot had removed 2,600 people from the system and prevented about £17 million in wrongful payments in under twelve months, with a larger team planned. The same announcement says that every case is reviewed by a human investigator and recognises that some errors are genuine. The figures and method are recorded in the official HMRC and Cabinet Office announcement on Child Benefit claims abroad.

That announcement creates a practical distinction between a data lead and a final decision. An airport departure, an address match or a missing update may cause HMRC to ask questions. It does not establish the exact date of a permanent move, the claimant’s National Insurance liability, the child’s residence or the application of the Withdrawal Agreement. Your response should correct the data lead with documents and a chronology. Do not send a general statement that the family is “still connected to Britain”; answer the legal conditions that HMRC has actually relied on.

The first group of possible reasons for a stop is therefore residence-related. HMRC may believe that you moved abroad permanently, that you were absent for longer than the permitted temporary period, that the child no longer lived with you or that a reported UK address was not your ordinary residence. The second group concerns the social-security link: HMRC may not see current UK National Insurance liability, UK employment, self-employment or a qualifying contributory benefit. The third group concerns coordination: another parent may be receiving a benefit, a French claim may have been notified or two records may appear to concern the same child. The fourth group concerns evidence, such as a missing response to a review request.

Ask HMRC to identify which group it has used. A telephone explanation is useful for discovering the problem, but the appeal file should contain the written decision, its effective date, the weeks affected, the amount stopped or treated as overpaid and the route for challenging it. If the letter refers to “overseas data” without giving the decisive facts, request the information needed to understand the conclusion and then respond without delaying the formal review. Do not assume that a later payment restart corrects an earlier overpayment or restores every missed week.

B. Does French CAF residence or a French benefit replace UK Child Benefit?

French and UK benefits must be placed in separate legal boxes. In France, the CAF means the Caisse d’allocations familiales, the body that administers many French family benefits. UK Child Benefit is a UK benefit administered by HMRC. A CAF account, a French social-security number or a French family-benefit award can be relevant evidence of the household, but none of those items automatically creates a UK entitlement. Equally, HMRC cannot reject a UK claim simply by pointing to a French form without deciding the UK conditions and any applicable coordination rule.

French domestic law starts from the place of residence and the place where the child is living. Article L. 111-2-3 of the French Social Security Code authorises regulations to define how the stability of residence and the regularity of stay are assessed. The official text says: “Un décret en Conseil d’Etat précise” the conditions for assessing those matters. The reference is important because an address on one document is not the entire French residence test. Evidence may include the family home, actual presence, schooling, household attachments and the continuity of the stay.

Article L. 512-1 of the Social Security Code states that a French or foreign person residing in France who has one or more children residing in France may receive French family benefits under the statutory conditions. Its opening words are: “Toute personne française ou étrangère résidant en France”. This is a French entitlement rule. It does not turn a British Child Benefit decision into a CAF decision, and it does not mean that a British parent should appeal an HMRC stop only by sending a French CAF award letter.

Service-Public’s current page on residence for family benefits explains that the general rule requires stable residence in France. It describes habitual residence and a stay in France for more than nine months during the calendar year of payment as relevant indicators, while also recognising an exception when an international regulation or convention provides for a benefit without French residence. The page also states that nationality is not, by itself, the condition. Read the French residence analysis at Service-Public’s guidance on living in France for family benefits alongside the specific benefit rules.

For a British citizen, Article L. 512-2 of the Social Security Code matters when the person asks France to pay a family benefit. It distinguishes European nationals satisfying the regular-residence conditions from foreign nationals outside that category who hold the title required to reside regularly in France. A WARP or another residence title may be relevant, but the CAF will still examine the child, the charge of the child and the particular benefit. A British resident should identify the document precisely rather than writing only “I have settled status” or “I have a Brexit card”.

Article L. 512-3 of the Social Security Code adds age and income conditions for children and qualifying young people. It provides that, subject to the specific rules for each benefit, entitlement can continue after compulsory schooling only within an age limit and where the child’s possible remuneration remains below a statutory ceiling. The UK rules and French rules use different concepts and different ages. A letter saying that the child is “still at school” cannot resolve both systems without identifying which benefit, which country and which period are under review.

The coordination question is addressed by Article L. 512-5 of the Social Security Code. The provision says that French family benefits cannot be combined with foreign child benefits in the circumstances it describes and that, when the foreign amount is lower, “seules des allocations différentielles peuvent être éventuellement versées”. An allocation différentielle is a differential payment: France may pay only the difference after taking the foreign benefit into account, where the legal coordination conditions are met. The provision does not create a free-standing UK Child Benefit right, and it does not authorise an institution to erase the UK decision without determining the applicable instrument.

The French legal distinction is especially important after Brexit. The official CAF Brexit circular explains that family benefits were excluded from the EU–UK Trade and Cooperation Agreement for situations beginning on or after 1 January 2021, while rights acquired under the Withdrawal Agreement could preserve the earlier coordination rules for qualifying situations. The circular also explains that a British claimant’s residence status and the child’s status must be examined for a French claim. It is an administrative document for CAF practice, not a replacement for the UK statute. The published reference is the CAF technical information on implementation of Brexit.

A Conseil d’État decision gives a useful illustration of the older European coordination logic. In Conseil d’État, 1st and 6th sub-sections sitting together, 30 December 2013, no. 353404, the court explained that cross-border workers residing in France and working in another member state could receive that state’s family benefits, with a possible French differential for the excess. The decision refers to “les travailleurs frontaliers résidant en France et exerçant une activité dans un autre Etat membre”. It predates Brexit and concerned the European coordination framework then in force. Its value today is limited to situations for which an applicable preserved right or other instrument still supplies that coordination; it cannot be used to assume that every post-2021 move receives the same treatment.

French case law also shows that a CAF dispute turns on the statutory documents and the actual legal category, not a general assertion about nationality. In Cour de cassation, Second Civil Chamber, 18 March 2021, no. 19-23.294, the court examined the operation of Article L. 512-2 and the proof required for a foreign child in a French family-benefit claim. The nationality and facts were not those of every British family, so the judgment should not be copied mechanically. It is nevertheless a warning against sending an incomplete residence file and hoping that a generic Brexit explanation will fill the gap.

In Cour de cassation, Second Civil Chamber, 8 April 2021, no. 19-24.661, the court again referred to the operation of Article L. 512-1 and the documents used to establish a family-benefit right. The decision concerned a French social-security claim rather than an HMRC award. It is relevant here because a French refusal can be a separate dispute with its own documents, appeal body and court. It does not turn the French court into an appeal tribunal for HMRC.

The amount paid in France may also matter to the calculation of an overpayment or differential, but it must be identified precisely. Keep the CAF decision, payment statement, date range and description of the benefit. A housing benefit, a disability benefit, a family allowance and a child-maintenance payment do not necessarily have the same coordination treatment. Do not describe every French payment as “family benefit” without preserving the French name and the legal basis. Translate the label into English for HMRC, but retain the original document.

French law has a separate prescription rule for family-benefit payments. Article L. 553-1 of the Social Security Code provides, in its current text, that the claimant’s action for payment is prescribed after two years and that recovery of unduly paid benefits is generally subject to the same period, with a longer period in cases of fraud or false declaration. This is not a rule governing HMRC’s British overpayment. It matters if the French side later claims an overpayment or refuses a period of French benefit, and it is another reason to preserve dates and payment notices.

The practical conclusion of the French analysis is narrow. A French residence card may support the factual timeline. A CAF claim may reveal which country has paid or refused. Article L. 512-5 may govern a French differential where the necessary coordination exists. None of those facts, alone, answers whether HMRC correctly stopped UK Child Benefit. The UK decision must be challenged through the UK route, while a French refusal must be challenged through the French social-security route.

II. How do I prove UK Child Benefit entitlement and appeal from France?

A. What evidence should I send when HMRC stops payment?

Start with the decision notice, not with a general bundle of family documents. Highlight the date of the decision, the first week affected, the last week paid, the reason given, any alleged overpayment and the instructions for asking HMRC to look at the decision again. If the notice says only that you are “living abroad”, request clarification of whether HMRC relies on permanent residence, a temporary absence, the child’s location, National Insurance, another claimant or an information failure. The appeal should answer the reason in the notice line by line.

Build one master chronology in date order. It should include:

• the date the claimant left the United Kingdom, if there was a move;
• the date the claimant arrived in France and the address occupied;
• the dates of any return to the United Kingdom and the purpose and length of each stay;
• the date the child moved, where the child lived during school terms and holidays, and any periods with the other parent;
• the dates of employment, self-employment, UK National Insurance liability, State Pension or another listed contributory benefit;
• the date a WARP or another French residence document was applied for, issued, renewed or replaced;
• the date a CAF or other foreign benefit was claimed, awarded, changed or refused;
• the date HMRC asked questions, the date you replied and the date payments stopped; and
• the date and amount of every payment or alleged overpayment in the period under review.

The chronology should be supported by documents, but it should not become a data dump. Use a numbered index and attach only documents that prove a point. For each document, write the date, issuer, fact proved and period covered. A bank statement showing an electricity direct debit may help establish that the family home was occupied; it does not, by itself, prove UK National Insurance liability. A passport stamp may show a crossing; it may not prove where the child lived for the whole week. The strength of the file comes from several documents agreeing on the same fact.

For a Withdrawal Agreement case, create a residence-status section. Include the WARP front and back, the issue or renewal notice, the prefecture correspondence, proof that the claimant was living legally in France before 1 January 2021 and documents showing continuity. If the right is derived through a family member, identify that person and provide the relevant relationship and residence evidence. If the WARP was late, missing or replaced, explain the administrative history rather than allowing HMRC to treat a missing card as proof that the protected residence never existed.

Do not confuse a WARP with a visa for a post-2020 move. A British citizen who first settled in France after the transition period may need to rely on a long-stay visa, a French residence permit and the domestic or international rules applicable to the new situation. The article’s subject is the Child Benefit decision, but the date of lawful residence remains important. A French residence permit may establish that the person is lawfully resident now; it does not automatically prove that a pre-2021 protected situation existed, and it does not automatically prove UK National Insurance liability.

For the National Insurance and work section, use official records wherever possible. Depending on the facts, the file may include a National Insurance record, payslips, P60 or equivalent employment evidence, a self-assessment record, a certificate or correspondence showing liability, a State Pension award letter or the award notice for a qualifying contributory benefit. Explain the relevant period. A payslip from 2024 cannot automatically prove liability for 2026. A French employment contract may establish French work, but it may also raise a question about which country’s social-security legislation applies. Answer that question rather than assuming the contract settles it.

For the child section, provide the birth certificate or civil-status evidence, school or nursery records, the child’s address, evidence of who provides day-to-day care and any agreement or court order governing alternating residence. If the child lives in the United Kingdom with the other parent, include evidence of that parent’s care and the basis on which you remain the person responsible or claim under the relevant rule. If the child lives in France with you, show actual residence rather than relying only on the child’s passport. If the child is a qualifying young person, include the education or training record and the information about earnings required by the applicable rules.

For the two-country coordination section, list every benefit paid or claimed in both countries. Give the institution, benefit name, claimant, child, period, gross amount and decision reference. If the other parent has made a claim, obtain the decision or ask the institution to confirm the status. Explain whether one country is primary and whether the other country has paid a differential amount. Do not conceal a foreign payment because you think it is irrelevant. A complete disclosure allows HMRC to calculate the correct result; an unexplained payment can make the file look inconsistent.

For a travel-data inquiry, create a table with departure date, return date, destination, purpose, evidence and the legal significance. Tickets, ferry bookings, work records, medical records, school attendance and accommodation records may help. Protect third-party personal data and send only what is needed. If the data identifies a genuine long absence, say so and explain the precise date on which the family’s position changed. If it is wrong, identify the wrong date and supply the document that corrects it. A response that attacks the existence of data without correcting the underlying timeline is unlikely to resolve the benefit question.

Check the award history for silent changes. HMRC may have changed the payee, stopped a child, adjusted the rate, created an overpayment or treated a change-of-circumstances report as a new claim. Compare the award notices with bank credits. Mark every unexplained gap. Ask for the calculation of any alleged debt, including the weeks, rate, reason and whether recovery is being suspended during reconsideration. The official GOV.UK guidance on Child Benefit overpayments says that the Child Benefit Office will write about the cause, repayment and appeal route; it also instructs people who think a payment is wrong to contact the office promptly.

Use the correct UK review form or written route stated in the decision. GOV.UK publishes CH24A, the form for asking HMRC to reconsider a Child Benefit or Guardian’s Allowance decision. The associated guidance says that a claimant normally has one month from the date of the original decision to ask for reconsideration. Treat that month as a hard working deadline even if you are still collecting evidence. Send the request on time, explain that further documents will follow if necessary and keep proof of delivery.

A concise review request should identify the decision, the child, the affected period, the exact error and the remedy sought. It may say, in substance: “I ask HMRC to reconsider the decision dated [date]. I dispute the conclusion that I ceased to satisfy the residence and cross-border conditions from [date]. My move, the child’s residence, my National Insurance or contributory-benefit position and my Withdrawal Agreement evidence are set out in the attached chronology. Please restore the award for the weeks proved, correct the award record and provide the calculation for any overpayment that remains.” Replace every placeholder with a date and document reference before sending. Do not send a vague letter containing only “I am British and live in France”.

The evidence should also address adverse facts. If you spent substantial time in the United Kingdom, explain why and state where your ordinary home and the child’s ordinary home were during the relevant period. If the family moved after 1 January 2021, do not present the case as a pre-2021 case; identify the actual rule relied on. If UK National Insurance stopped, explain whether another listed benefit, transitional rule or coordination provision applies. If the child’s care changed, give the exact date and do not claim an uninterrupted award for a period that the evidence cannot support.

Keep the communication channel stable. If you use an online account, download the submission confirmation and the documents uploaded. If you write, send copies, use a tracked method where practical and keep the envelope, receipt and a complete copy of the bundle. Record every call with the date, number dialled, name or identifier of the adviser, information given and follow-up promised. A call note is not a substitute for the formal review request, but it can show that you acted promptly when the payment stopped.

Ask for a written decision after the review. A restart of payment can be partial, provisional or limited to a future date. Confirm whether the decision restores the past weeks, withdraws the overpayment and recognises the claimed legal route. If HMRC asks for another document, reply by the stated date and explain why the document is unavailable. For a French document, retain the original and provide an English explanation; if HMRC requests a translation, obtain a reliable translation and keep the receipt.

B. What deadline and remedy follow a refusal or overpayment?

There are two different UK problems: an entitlement decision and an administrative recovery decision. An entitlement decision answers whether Child Benefit is due for a child and period. An overpayment decision asks whether money already paid must be recovered. They may arise from the same facts, but they should be challenged separately. The appeal form guidance for HMRC decisions warns that administrative matters such as the recovery of an overpayment may not carry the same right of appeal as an appealable entitlement decision. Read the notice and the accompanying appeal instructions instead of assuming that one letter creates one universal remedy.

If the reconsideration confirms that Child Benefit is not due, the next route may be an appeal to the independent tribunal using form SSCS5. The official HMCTS guidance on appealing an HMRC benefit decision explains that an appeal about Child Benefit must be made in writing, give the reasons for appeal and include the relevant decision notice or reconsideration notice. The notice controls the particular deadline and tells you whether the decision has a right of appeal. Do not confuse this tribunal with a French tribunal judiciaire.

For a British resident in France, the practical appeal file should contain four layers. The first layer is jurisdiction and route: the decision, the reconsideration request and the notice explaining the tribunal route. The second layer is law: the statutory residence rule, the regulations, the Withdrawal Agreement basis and the official guidance relied on. The third layer is fact: the timeline, the child’s residence, the claimant’s work or contribution status and the other parent’s position. The fourth layer is remedy: the weeks that should be restored, the amount wrongly withheld and the correction required to the overpayment calculation.

If the deadline is close, file the appeal with the evidence already available and state what will follow. A late perfect bundle is less useful than a timely appeal that preserves the right to be heard. Explain any delay honestly, including illness, lack of access to the letter, a move, bereavement or a document request that could not be answered. The tribunal may have rules for admitting a late appeal, but do not rely on discretion when the deadline can be protected.

If an overpayment is being recovered, ask HMRC to suspend or hold recovery while the entitlement decision is reconsidered or appealed where the official process permits. The CH24A material says that recovery action can be put on hold during reconsideration or an appeal. This does not erase the alleged debt. It protects cash flow while the underlying right is tested. If you cannot pay or need time, contact HMRC and state whether you dispute the debt, need the calculation or accept part of the amount. Do not ignore a recovery letter.

A complaint and an appeal perform different functions. A complaint is appropriate for delay, poor treatment, a failure to answer correspondence or an administrative error. It does not replace a request to reconsider entitlement or a tribunal appeal. The official GOV.UK Child Benefit complaints procedure describes the complaint route and the further escalation available if the service issue is not resolved. Put the merits challenge and the service complaint in separate letters so that a complaint cannot be mistaken for an appeal.

The French route is also separate. If the CAF has refused a French family benefit, reduced a payment or claimed an overpayment, identify the decision date and the appeal instructions printed on the notice. A Commission de recours amiable, or CRA, is the internal amicable-review commission of the social-security body. For the relevant French social-security disputes, the mandatory preliminary appeal is governed by Article L. 142-4 of the Social Security Code, which states: “Les recours contentieux … sont précédés d’un recours préalable”. In plain English, a court action is preceded by the required preliminary appeal in the matters covered by the provision.

Article R. 142-1 of the Social Security Code specifies the CRA route for claims against decisions of social-security bodies and states that the commission must be seized within two months of notification of the decision. Use the current period written on the CAF decision as well, because the nature of the decision and subsequent procedural changes can matter. Send the CRA submission to the address or channel in the notice, identify it expressly as a recours préalable, explain the errors and attach proof of submission.

The CRA request should not be a copy of the HMRC letter. It should establish the French claim: stable residence in France, the claimant’s status, the child’s residence and effective and permanent care, the relevant benefit, any foreign payment and the reason why the CAF’s calculation or refusal is wrong. If the French authority relies on Article L. 512-2, provide the exact residence document and child documents it has requested. If it relies on Article L. 512-5, explain the foreign benefit, the coordination instrument and the calculation of any differential. If the French decision misidentifies a UK payment, attach the UK award notice and explain the difference between the two benefits.

If the CRA has not notified its decision within the applicable two-month period, Article R. 142-6 of the Social Security Code states that the claimant may treat the request as rejected. The current text also says that the period runs from receipt of the complaint and can be affected when documents are produced later. Record the date the CAF received the appeal and the dates of later submissions. Do not assume silence means that the French benefit has been granted.

A social-security dispute against a CAF decision is ordinarily brought before the specially designated judicial court after the preliminary route, not before an administrative court simply because the decision came from a public-service body. Article L. 211-16 of the Code of Judicial Organisation assigns specially designated judicial courts disputes within the social-security litigation defined by Article L. 142-1. The court, territorial venue and procedural deadline must be checked from the CAF notice and the current procedural rules. A British family should not send a French CAF appeal to HMRC, and it should not file a UK tribunal form to challenge a French differential.

French case law reinforces the need to choose the correct court and evidence. In Cour de cassation, Second Civil Chamber, 24 June 2021, no. 20-11.089, the court considered a challenge concerning family benefits, an international social-security convention and the documents requested for a child. The judgment is fact-specific and does not decide a British Child Benefit claim, but it illustrates that a treaty argument must be connected to the actual text, claimant status and evidence. A statement that “Brexit means my rights are unchanged” is not a complete legal argument.

If the CAF decision concerns a recovery of French benefits, use the French overpayment rules and calculation, not the HMRC overpayment route. Article L. 553-1 may raise a prescription question, while Article L. 553-2 addresses recovery mechanisms. The official Article L. 553-1 text should be read with the benefit notice, the alleged period and any fraud or false-declaration allegation. Do not admit fraud in a casual email merely because a date on a form was wrong; describe the error, correct it and obtain advice on the consequences.

When the same household has a UK and a French dispute, use a two-column litigation calendar. The left column should show the HMRC review and tribunal deadlines. The right column should show the CAF CRA and subsequent judicial deadlines. Put the notification date, deadline, authority, reference, documents required and proof of submission in each row. The legal systems use different vocabulary and different institutions. A missed French CRA deadline cannot be repaired by telling HMRC that the CAF file is pending, and a pending HMRC review cannot automatically suspend a French recovery action.

There may be a tactical reason to challenge both decisions. If HMRC says France is responsible and the CAF says the UK is responsible, each authority may be relying on an incomplete picture of the other country’s payment. Send each body the other body’s notice, explain that the family is seeking a coherent coordination decision and ask for the precise rule used. Preserve the original envelopes and portal timestamps. A cross-border disagreement is easier to resolve when both institutions can see the same timeline and the same amounts.

There may also be a reason not to overstate the case. If the family moved permanently after the protected period, the Child Benefit claim may fail even if the claimant has a WARP for a different family member or owns a home in France. If the child lived with the other parent and that parent was the person responsible, the payment may have to be redirected rather than restored to the original claimant. If the claimant’s UK National Insurance liability ended, a historic contribution record may not prove a current entitlement. A good appeal identifies the weeks it can prove and asks for a lawful correction rather than an unlimited restoration.

The best appeal question is therefore specific: “For which weeks did I satisfy which rule, what document proves each element, and what exact amount should be paid after accounting for any other benefit?” The answer should be possible to audit. If it is not, the file needs a better chronology or a more precise legal analysis. This method also protects against an accidental admission: a family can concede that one temporary absence exceeded a limit while showing that the decision wrongly stopped every week thereafter.

Before sending the final response, run a five-point check:

• Does the evidence prove the claimant’s location and the child’s location for every disputed period?
• Does it show the date and legal basis of any Withdrawal Agreement protection, rather than only a nationality?
• Does it prove the relevant UK National Insurance, work or contributory-benefit condition for the weeks claimed?
• Does it disclose every relevant UK and French family payment and distinguish a full award from a differential?
• Does it preserve the HMRC review or tribunal deadline and, if necessary, the French CRA deadline?

If any answer is no, send the procedural step needed to protect the deadline and obtain advice on the missing point. A British citizen living in France may be dealing with a residence question, a social-security coordination question, an evidence question and an overpayment question at the same time. Treating all four as one nationality dispute is the fastest way to send the wrong documents to the wrong authority.

Conclusion

HMRC can review or stop UK Child Benefit when a British family moves to France, particularly where a travel-data match, a change in address, an absent National Insurance record or another claimant suggests that the conditions may have changed. The review must still be tied to the exact week, claimant, child, residence status and international rule. A family covered by the Withdrawal Agreement may have a route to continued payment, but a WARP alone does not prove every element. A post-2020 move needs its own analysis.

The French side should be kept distinct. French CAF benefits depend on French residence, the child’s situation and the applicable social-security rules. Article L. 512-5 may produce a differential calculation when coordination applies, but it is not a substitute for the UK appeal. If CAF refuses, the CRA and French judicial route have their own documents and deadlines. If HMRC refuses, use the stated reconsideration and tribunal route, and challenge recovery separately where necessary.

For a practical cross-border file, preserve the decision notices, prepare a dated chronology, prove the child’s actual residence, document the Withdrawal Agreement or other legal basis, show the UK contribution or benefit link, disclose French payments and submit the review before the deadline. You should be able to show, week by week, why payment should continue, be restored, be redirected or be replaced by a properly calculated differential.

For background on the separate French CAF issue, see our guide to challenging a French family-benefit refusal for a British citizen in France. That page concerns the French claim; this article addresses the narrower UK Child Benefit stop and the evidence needed for HMRC.

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