Margaret taught in a Sheffield comprehensive for thirty-one years, paid National Insurance on every payslip, and retired to a stone house outside Sarlat with her husband in 2022. The pension followed her across the Channel without drama, paid every four weeks into her French account, and for a while she gave it no thought. Then three letters landed in the same month: the yearly increase appeared in full and a neighbour insisted that could not be right after Brexit, her husband realised he had only twenty-seven qualifying years and wondered whether topping up from France was still possible, and the French tax office sent an avis d’imposition, which is the annual income-tax bill, treating the whole British pension as French taxable income plus social charges. Each letter raised the same underlying question from a different angle: which country owns your retirement once you live in France but your pension rights were built in Britain.

This article answers in the only order that protects you. First, the British side: getting the State Pension paid in France, keeping the yearly increase, claiming it on time, and topping up missing years with voluntary contributions from abroad. Second, the French side: why France taxes the pension as your country of residence, how the 1963-to-2008 treaty network divides taxing rights between London and Paris, the exact allowances, rates and social-charge exemptions that cut the bill, and how to challenge every reassessment, interest charge and penalty step by step. Every decisive statement below is anchored to the official text it comes from, quoted word for word, with the link beside it.

I. My UK State Pension has followed me to France: will it still be paid, will it still rise, and can I top it up from France?

A. How do I get the pension paid in France and keep the yearly increase after Brexit?

Your State Pension, which is the flat-rate pension the British state pays from National Insurance records, can be paid anywhere in the world, including France, usually straight into a bank account in the country where you live. Brexit changed nothing about that plumbing. What Brexit did change is the legal scenery around it: Britain is no longer a Member State, so every protection you keep in France now flows either from the Franco-British tax treaty of 19 June 2008, from the social-security coordination rules that the Withdrawal Agreement preserved for people already in a cross-border position, or from British domestic rules that happen to favour France. The first reflex is therefore to sort every question into the right drawer: payment and increases are British domestic law, healthcare cover is coordination law, and taxation is treaty law. Mixing the drawers is how expensive mistakes happen.

On increases, the rule that matters is short and official. The British government states: Your State Pension will only increase each year if you live in: followed by a list that begins with the European Economic Area (EEA), then adds Gibraltar, Switzerland and certain agreement countries, and warns: You will not get yearly increases if you live outside these countries. Full guidance at State Pension if you retire abroad: rates. France sits inside the European Economic Area as a matter of geography and treaty membership, so a British pensioner settled in the Dordogne, in Paris or in Nice keeps the yearly triple-lock increase exactly like a pensioner in Leeds. The neighbour who insists Brexit froze your pension is confusing France with countries such as Australia or Canada, where the pension is indeed frozen at its first rate. The same page adds the safety net for anyone who does move to a frozen country and returns: Your pension will go up to the current rate if you return to live in the UK. Keep evidence of residence dates anyway, because the paying authority applies the rule mechanically from the address it holds, and an address file that still shows Rotherham when you live in Bergerac, or the reverse, produces the wrong rate in either direction.

Claiming deserves the same methodical care as the increase. Check your forecast before you claim, claim in good time, and tell the paying authority your French address and bank details the day they change, because arrears caused by an unreported move are recovered slowly and overpayments are recovered relentlessly. Once the pension is in payment, the next document to organise is healthcare, and here Britain still funds cover for its pensioners abroad. The official healthcare guidance for France says: You may also have the right to apply for a UK S1 if you start drawing a UK State Pension, and explains that You may be entitled to state healthcare paid for by the UK if you are a resident in France and receive a UK State Pension or an exportable benefit. Full guidance at Healthcare for UK nationals living in France. The S1, which is the portable document by which Britain certifies that it pays for your healthcare, is then registered with the CPAM, which is the caisse primaire d’assurance maladie, the local French health fund, of your place of residence. Registration produces a French social-security number and eventually the carte Vitale, which is the green health-insurance card presented at every surgery and pharmacy. If you have no S1, France still covers lawful residents through the PUMA, which is the protection universelle maladie, the residence-based universal health cover: Toute personne travaillant ou, lorsqu’elle n’exerce pas d’activité professionnelle, résidant en France de manière stable et régulière bénéficie, en cas de maladie ou de maternité, de la prise en charge de ses frais de santé dans les conditions fixées au présent livre. That is Article L. 160-1 of the Social Security Code. Our companion guide walks through the S1 route, the PUMA route and the refusal remedies in detail at British Healthcare in France: S1, PUMA, CPAM and the Carte Vitale. The reason healthcare belongs in a pensions article is the tax section below: whether you are borne by a French scheme or remain UK-insured under an S1 decides thousands of euros of social charges on the very same pension.

B. Can I still top up missing years from France with voluntary National Insurance?

Margaret’s husband has twenty-seven qualifying years and needs thirty-five for the full new State Pension. Every missing year is roughly one thirty-fifth of the full rate lost, every year, for life, indexed. For a couple, the arithmetic over two retirements easily reaches five figures, which is why topping up from France is the highest-value paperwork most British households in France will ever do. National Insurance contributions, which are the British social-security contributions that build entitlement to the State Pension, can be paid voluntarily from abroad, and France is one of the straightforward cases because the paying rules for residents abroad apply identically whether you live in Montmartre or Melbourne.

The entry conditions for the older years are deliberately undemanding. The official guidance states: To pay voluntary Class 2 or Class 3 National Insurance contributions, you must have either: previously lived in the UK for 3 years in a row or paid contributions (or had Class 2 contributions treated as having been paid) for at least 3 years in total. Full guidance at Voluntary National Insurance if you live or work abroad. Class 2, which is the flat-rate weekly contribution for self-employed and certain workers abroad, is far cheaper than Class 3, which is the general voluntary rate, but it has two extra strings: To pay voluntary Class 2 contributions, both of the following must also apply: you worked in the UK immediately before leaving and you are working abroad (or you worked while you were abroad). A retired couple living off pensions and rental income in the Lot will therefore usually pay Class 3, while a British consultant who moved to Lyon and keeps working can often secure Class 2 and pay a fraction of the price for the identical pension increment. The application runs on form CF83, which is the claim to pay voluntary contributions for periods abroad, filed with HM Revenue and Customs, the British tax authority, and the decision letter that comes back tells you exactly which years you may buy and at which class. Keep that letter with your French tax file: it is the proof that the top-up was offered, priced and paid, and it answers the French inspector who asks why a pension amount suddenly rose.

Two deadlines dominate, and both changed recently. The extended window for filling gaps back to 2006 closed for most people on 5 April 2025, and the normal six-year backfill rule now governs again, so a year left unfilled eventually becomes unfillable. More structurally, from the 2026 to 2027 tax year the Class 2 door closes for time spent abroad: You cannot pay voluntary Class 2 National Insurance contributions for time abroad. After 5 April 2026, the guidance continues: You can apply to pay Class 3 contributions for time spent abroad after 5 April 2026 if you have either: previously lived in the UK for 10 years in a row or paid 10 years of qualifying National Insurance contributions in total. A transitional shelter exists for people who applied for 2024 to 2025 or 2025 to 2026 on or before 5 April 2026 and pay by 5 April 2027, who may then also buy 2026 to 2027 under the old three-year test. Practically, any British household in France with gaps should run a forecast now, file CF83 before the cheaper classes and wider windows narrow further, and diary the payment date, because an approved application left unpaid buys nothing. One caution that belongs to the French side of the file: contributions you pay are a British matter, but the higher pension they produce is French taxable income from the first euro, declared exactly like the base pension, as explained below. Buy the years with open eyes about the French tax on the uplift, and the purchase still pays for itself in the great majority of cases.

II. How does France tax your British State Pension, and how do you challenge the bill?

A. Which country taxes the pension, which allowances cut it, and who escapes the social charges?

Start with residence, because everything else hangs on it. France taxes its tax residents on worldwide income, and you are deemed domiciled in France when everyday life sits here: Sont considérées comme ayant leur domicile fiscal en France au sens de l’article 4 A : a. Les personnes qui ont en France leur foyer ou le lieu de leur séjour principal. That is Article 4 B of the General Tax Code, and a retired couple whose only home, doctors, grandchildren visits and daily life are in the Dordogne meets the test without discussion, even with British passports, a London bank account and a postal vote in Sheffield. Once resident, the pension enters the French net automatically: Les traitements, indemnités, émoluments, salaires, pensions et rentes viagères concourent à la formation du revenu global servant de base à l’impôt sur le revenu. That is Article 79 of the General Tax Code. No separate French category exists for foreign pensions; the British State Pension is simply a pension inside global income.

The treaty then confirms that France, as the residence state, is the country that taxes it. Article 18 of the Franco-British convention of 19 June 2008, official treaty text at France-UK double tax treaty (impots.gouv.fr), provides: Sous réserve des dispositions du paragraphe 2 de l’article 19, les pensions et autres rémunérations similaires payées à un résident d’un Etat contractant au titre d’un emploi antérieur ne sont imposables que dans cet Etat. A British State Pension paid to a French resident for past employment is therefore taxable only in France, and Britain must give it up: in practice the pensioner files the France-Individual claim so HM Revenue and Customs pays the pension gross, a procedure the French tax commentary describes in these terms: le bénéficiaire doit établir, ou faire établir par son représentant éventuel, une demande sur un formulaire France-Particulier (Form France-Individual) pour les personnes physiques, under BOI-INT-CVB-GBR-10-30, Residence of France receiving British private pensions. The mirror image matters for former public servants: government-service pensions stay taxable in the paying state, because Les pensions et autres rémunérations similaires, payées par un Etat contractant ou l’une de ses collectivités locales ou, dans le cas de la France, par une personne morale de droit public, soit directement, soit par prélèvement sur des fonds qu’ils ont constitués, à une personne physique au titre de services rendus à cet Etat, collectivité ou personne morale ne sont imposables que dans cet Etat., with the single nationality-and-residence exception that follows in the same paragraph. A teacher’s local-government pension paid by a British council to a French resident therefore remains British-taxable, while her State Pension is French-taxable; the two pensions in one household can point in opposite directions, and each must be declared on its own line. Our analysis of the private-versus-Crown pension divide, with the Article 19 case law, is set out at British Pensions in France: the Lump Sum, Crown Pensions and the Tax Bill.

Declaration follows the foreign-income channel. The State Pension is entered on return 2047, which is the return for income received abroad, then carried to the main return 2042, which is the standard personal income-tax return, and converted at the official yearly rate. Two reliefs then do the heavy lifting. First, the 10 per cent pension allowance: Les pensions et retraites font l’objet d’un abattement de 10 % qui ne peut excéder 4 439 €., with a guaranteed floor, since L’abattement indiqué au deuxième alinéa ne peut être inférieur à 454 €, sans pouvoir excéder le montant brut des pensions et retraites. That is Article 158, 5, a of the General Tax Code. The allowance applies per pensioner within the household ceiling, so a couple with two pensions each gets the abatement computed on their own pension, a detail routinely missed when one spouse prepared the return alone. Second, the treaty credit of Article 24: where Britain exceptionally retains a taxing right or levies withholding, France grants a credit equal to the French tax on that income. The Conseil d’Etat, which is the supreme court for tax disputes, clarified the mechanism for this very treaty in its opinion of 12 February 2020, No. 435907, read at CE, opinion, 12 February 2020, No. 435907. On the scope of the credit, it holds that the treaty’s opening words signifie qu’alors même que d’autres stipulations de la convention prévoient que certains revenus sont imposables ou ne sont imposables qu’au Royaume Uni, ces revenus peuvent néanmoins être pris en compte pour le calcul de l’impôt français. France keeps the income in its base, then neutralises the double hit by credit. On social charges specifically, the opinion refuses to amputate the credit: L’expression en cause ne saurait permettre à la France, s’agissant des résidents de France personnes physiques, de ne pas appliquer le crédit d’impôt prévu à l’alinéa (i) du a) du paragraphe 3 de l’article 24 aux contributions sociales françaises, au motif qu’aucun impôt sur le revenu ou sur un élément du revenu de nature équivalente n’existe au Royaume-Uni. And on proof, the opinion is taxpayer-friendly: the credit requires only that les revenus en cause doivent être compris dans la base de ” l’impôt du Royaume-Uni ” au sens du a) du paragraphe 1 de l’article 2 de la même convention, sans que le résident de France en soit exonéré à raison de son statut ou de son activité., because cette condition n’exige pas que les revenus en cause aient été soumis à une imposition effective. It follows that la condition prévue à l’alinéa (i) du a) du paragraphe 3 de l’article 24 de la convention doit être regardée comme satisfaite s’il est établi par le résident de France qu’il a déclaré les revenus en cause au Royaume-Uni, parce que ces revenus étaient compris dans la base de l’un des impôts énumérés au a) du 1 de l’article 2 de la convention, alors même qu’il n’aurait acquitté dans cet Etat aucun impôt à raison de ces revenus. In plain terms, a pensioner whose British personal allowance wipes out any UK liability still gets the French credit, provided the pension sat inside the British tax base. Keep the British tax calculation or the HM Revenue and Customs coding notice proving the income was within scope: that single page is the credit.

Social charges are where the file is won or lost, because the headline income-tax rate is only half the bill. The contribution sociale généralisée, universally called the CSG, is the broad social levy on replacement income, and the contribution pour le remboursement de la dette sociale, the CRDS, clears the historic social debt alongside it. Both can add roughly nine points to the marginal bite on a pension, so the exemption question is worth more than the allowance question. The statute draws the line by affiliation, not by nationality: Il est institué une contribution sociale sur les revenus d’activité et sur les revenus de remplacement à laquelle sont assujettis : 1° Les personnes physiques qui sont à la fois considérées comme domiciliées en France pour l’établissement de l’impôt sur le revenu et à la charge, à quelque titre que ce soit, d’un régime obligatoire français d’assurance maladie. That is Article L. 136-1 of the Social Security Code. A pensioner who holds a British S1, registered with the CPAM as UK-insured, is by definition not borne by a French compulsory scheme, and the CSG and CRDS simply have no hook. The pensioner with no S1, affiliated to the French universal scheme on residence grounds, is inside the hook, and the rate is fixed by statute: Sont assujetties à la contribution au taux de 8,3 % les pensions de retraite, et les pensions d’invalidité. That is Article L. 136-8 of the Social Security Code, with reduced rates and total exemption at the bottom of the income scale depending on the reference income of two years earlier. The capital-income cousin of the same levy, which reaches rental income and gains rather than pensions, sits at Article L. 136-6 of the Social Security Code, and the two must never be confused in a reply to the administration: pensions are replacement income under L. 136-1, property income is patrimoine under L. 136-6, and each has its own rate, base and exemption logic.

Three layers of case law protect the S1 pensioner who is charged anyway. First, the de Ruyter line: the French tax authority itself summarises that La jurisprudence ” de Ruyter ” (arrêt de la Cour de justice de l’Union européenne (CJUE) du 26 février 2015 dans l’affaire C-623/13) proscrit, pour la période antérieure au 1er janvier 2016 (depuis lors, l’article 24 de la loi de financement de la sécurité sociale pour 2016 a modifié l’affectation des impositions en cause), l’application des prélèvements sociaux sur les revenus du capital pour les contribuables qui sont affiliés à un régime légal de sécurité sociale dans un État membre de l’Union européenne (UE) autre que la France, de l’Espace Economique Européen (EEE) ou en Suisse. See the official notice at Tax authority notice: consequences of the de Ruyter case law. The same notice sounds the Brexit warning: les personnes relevant de la législation sociale d’un Etat tiers à l’UE, l’EEE ou de Suisse ne peuvent pas bénéficier de la restitution des prélèvements sociaux mis à leur charge. A British pensioner might read that sentence and panic, but the panic is misplaced where an S1 exists: the exemption for S1 holders flows directly from the wording of Article L. 136-1, which requires bearing by a French scheme, a condition the S1 holder fails by holding British cover, regardless of de Ruyter. The third-state warning bites the pensioner with no coordination cover at all, which is precisely why obtaining and registering the S1 before the tax year closes is protective tax planning, not mere healthcare administration. Second, the single-legislation principle confirmed again by the Cour de cassation on 25 September 2025 in case 22-24.634, read at Cass. civ. 2, 25 September 2025, No. 22-24.634: affiliation follows one state at a time, dans le respect du principe d’unicité d’affiliation, and a person properly insured in one state n’est pas redevable au titre des prestations en nature de l’assurance maladie d’un double prélèvement par l’État d’emploi et l’État de résidence. An S1 holder charged French CSG on top of British cover is living that double levy, and the judgment is the shield. Third, the Article 24 credit opinion quoted above extends the treaty credit to the contributions sociales themselves, so even where the levy is due, the credit mechanics cap the combined Franco-British burden. Worked example: a Dordogne couple each receiving the equivalent of 12,000 euros of State Pension, both on S1 cover, each deducts the 10 per cent allowance down to 10,800 euros, pays French income tax on that base at their marginal household rate, and pays zero CSG and zero CRDS because neither is borne by a French scheme. The same couple without S1 cover pays the identical income tax plus roughly 9 per cent of social charges on the gross pension. The S1 is worth about 2,000 euros a year to that household, every year, which is why the healthcare section of this article is secretly a tax section.

B. How do I challenge a wrong French bill on my British pension step by step?

Most wrong bills repeat the same five errors, and the challenge is a checklist, not an essay. Error one: the return omitted the 10 per cent allowance or applied one household ceiling instead of one computation per pensioner. Error two: a Crown or government-service pension was lumped with the State Pension and taxed in France although Article 19 reserves it to Britain, or the reverse, a State Pension was taxed as though Britain kept a right it gave up in Article 18. Error three: CSG and CRDS were charged although a valid S1 covered the year, the classic computer-generated error where the levy office sees a French address and stops reading. Error four: the Article 24 credit was refused on the ground that no British tax was effectively paid, the exact refusal the Conseil d’Etat forbids in the opinion quoted above. Error five: the pension was converted at a fantasy exchange rate or allocated to the wrong year. Price each error separately before writing anything, because a challenge that mixes them invites a global rejection while five priced corrections invite five admissions.

Procedure then runs in three locks. First, answer the proposition de rectification, which is the reasoned adjustment notice the administration must send before recovering, within the deadline printed on it, in French, by recorded delivery, point by point, attaching the S1 and CPAM registration certificate for the year, the France-Individual reply or HM Revenue and Customs coding notice proving the pension sat in the British base, the British calculation showing any allowance absorption, the return copies proving the allowance claim, and the bank statements pinning the conversion rate. Ask expressly for discharge of penalties where you relied on the treaty in good faith and for a stay of recovery while the dispute runs. Second, if the reply fails, file the réclamation contentieuse, which is the formal administrative claim against the bill, then appeal to the tribunal administratif, which is the court hearing tax disputes, exactly as the taxpayers did in the cases above, who litigated year by year to the Conseil d’Etat. Third, keep limitation in mind from day one: claims must be filed within the statutory window after the bill, documents must be kept until every window closes, and paying the principal while expressly reserving the challenge stops late interest without surrendering the case. Penalties for wilful omission can reach 40 per cent, so the file must show good faith at every page: declared pension, attached S1, cited articles, dated letters. For readers in Paris and the Île-de-France region, the procedure is national and online filing through the impots.gouv.fr personal account works identically, but keep a complete duplicate file, paper and scanned, of every notice, reply, return and receipt, because the capital’s processing volumes mean longer delays and a lost acknowledgment is the single most expensive piece of paper to replace when deadlines are argued.

Conclusion

A British State Pension in France is good news managed in the right order. Confirm the pension is in payment at the correct French address, verify the yearly increase was applied on the EEA rule, and run a forecast to see which missing years can still be bought, remembering that Class 2 for time abroad disappears after 5 April 2026 and the entry test hardens to ten years. Register the S1 with the CPAM the moment the pension starts, because that single registration decides both healthcare funding and the CSG exemption. Declare the pension on returns 2047 and 2042, claim the 10 per cent allowance per pensioner, split State Pension from any Crown pension between Articles 18 and 19, and claim the Article 24 credit even where Britain collected nothing, armed with the Conseil d’Etat opinion that no effective British taxation is required. Meet every wrong bill with the five-error checklist, the dated S1, the British base proof, and the treaty text, and challenge through the adjustment reply, the formal claim and the court without missing a deadline. Handled in that order, the pension that followed you across the Channel stays what it was earned to be: deferred wages, taxed once, increased yearly, and topped up where it counts.