A British resident of France who receives a one-off pension payment from the United Kingdom can face a surprisingly difficult question: is the money a pension paid as capital, an investment withdrawal, or another form of income? That classification affects the French tax base, the declaration line, the treatment of social charges and the possibility of requesting the 7.5% French rate. Brexit did not create a general exemption and the label used by a UK provider, such as “tax-free cash”, does not settle the French analysis. The France–UK double-tax treaty must also be read alongside the French General Tax Code and the documents describing the scheme. This guide examines a lump sum received by a person who is treaty-resident in France, explains the conditions for the French prélèvement libératoire—a final withholding tax—and sets out the evidence needed to challenge an overcharge. State pensions, public-service pensions, QROPS transfers and ordinary monthly pension reporting remain separate questions; links to the wider pension guidance are included where they help.

I. Why is my UK pension lump sum taxed in France after Brexit?

A. Is a UK private pension lump sum taxable income in France?

The first question is not whether the payment arrived in a British bank account. It is what the payment legally represents. A French tax resident is normally taxed on the income allocated to France under domestic law and the applicable treaty. A payment made by a UK workplace pension, personal pension, self-invested personal pension or an employer retirement arrangement may therefore need to be considered in France even where the provider described it as a tax-free lump sum under UK rules. The date of payment, the recipient’s treaty residence, the scheme rules and the history of the contributions all matter.

French law expressly includes capital-form retirement benefits in the income-tax base. Article 79 of the French General Tax Code states: 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. Il en est de même des prestations de retraite servies sous forme de capital. In English, a payment does not escape the pension rules merely because the provider paid it once instead of periodically. The provision does not, by itself, prove that every UK withdrawal is a French pension. It does show why the frequency of payment is not a safe answer.

The next step is to identify the source of the rights. A genuine retirement benefit normally has a link with the end of professional activity, a pension objective and contributions that followed a tax or employment regime. The French tax administration’s current guidance on retirement pensions distinguishes ordinary pension income, retirement benefits paid as capital and withdrawals from other savings products. It also refers to the 7.5% option for certain capital payments. A personal pension statement, scheme booklet, employer contribution record and provider letter are more useful than a bank statement showing only the amount received.

Article 158 of the General Tax Code supplies the category rules for pensions and capital-form retirement payments. Its relevant provisions place pensions within the income rules in Articles 79 to 90 and refer to the possible application of Article 163 bis for eligible capital payments. The current Article 158 text must be read in the version applicable to the tax year concerned. A return prepared from an older article or from a generic online pension calculator can miss a change in the plan, the contribution history or the legal version used for the assessment.

There is an important boundary between a retirement payment and a withdrawal from an investment. The recent CAA de Bordeaux decision no. 23BX02970, 3 December 2025, concerned a large payment from an international employer arrangement. The court examined the plan documents, the employer funding and the fact that the employee received part of the accumulated account after leaving the group. It held that the sum did not have the legal character of a pension paid as capital and stated: la somme de 411 091 euros perçue au cours de l’année 2015 ne présente pas le caractère d’une pension de retraite versée en capital mais relève de la catégorie des revenus de capitaux mobiliers. That is a warning against treating every one-off retirement-related payment as eligible for the reduced rate.

The same decision also shows why the classification dispute can produce a partial result rather than an all-or-nothing victory. The court rejected the pension-capital treatment for the payment in issue, but it did not accept that the entire gross amount was automatically a taxable investment return. It examined the employer’s contributions and the investment gain and reduced the taxable amount on the basis of the documents. A British taxpayer should therefore preserve a ledger showing employee contributions, employer contributions, transfers, investment growth, withdrawals and the date on which the rights became available. Without that trail, a French assessment may treat the provider’s gross figure as if it were a single homogeneous income.

The opposite classification can also be legally correct. In CAA de Nantes, decision no. 19NT02949, 10 June 2021, the taxpayers argued that an €88,882 payment should be treated as a life-insurance investment rather than a pension. The court concluded that, despite the form of the arrangement, le capital versé doit être assimilé à une pension and added that Le montant du capital est ainsi imposable à l’impôt sur le revenu en application de l’article 79 du code général des impôts. The factual description of the scheme, the purpose of the rights and the contribution history drove the result. A taxpayer should use this case carefully: it supports a pension classification where the documents support it, not an automatic rule for all UK products.

Do not confuse the French 7.5% pension-capital regime with the taxation of an ordinary UK ISA, a general investment account, a life-insurance policy or a QROPS transfer. The tax event may be a withdrawal, a transfer, a surrender, a pension commencement payment or a retirement benefit. Each has a different legal starting point. If the payment comes from a foreign life-insurance or capitalisation contract, the foreign-contract reporting rule may also need review. Article 1649 AA of the General Tax Code requires declarations for certain foreign contracts and states that payments made through an undeclared contract are, absent contrary proof, treated as taxable income. That rule is not a substitute for classifying a pension, but it is a reason to identify the contract before filing.

For a British taxpayer, the practical conclusion is simple but precise: collect the scheme rules before choosing a French box. Ask the UK provider whether the payment was made under a registered pension scheme, whether it was a full or partial crystallisation of rights, whether any rights remain available, which contributions were made by the employer or employee and whether the payment was treated as a pension, drawdown, transfer or investment withdrawal. Ask for the answer in writing. The provider’s UK tax label is relevant evidence, but it is not the final French legal classification.

B. Does the France–UK tax treaty decide where the lump sum is taxed?

The France–UK double-tax treaty comes after the facts have been mapped. The starting point for a person who has moved to France is treaty residence, not nationality and not the location of the bank account. The treaty’s private-pension rule is commonly found in Article 18, while government-service remuneration is dealt with separately in Article 19. The official UK publication of the 2008 France–UK convention and the French treaty text made available by impots.gouv.fr should be read together for the relevant tax year.

For a private pension or similar remuneration paid in consideration of past employment, the treaty generally allocates taxing rights by reference to the beneficiary’s residence, subject to the precise wording and the type of payment. A French-resident person receiving a UK private workplace pension will often need to analyse French taxation first. That does not mean the UK can never withhold tax. The provider may apply a temporary or default deduction, and the recipient may need to contact HMRC or use the relevant treaty process. It does mean that the UK withholding decision and the French income-tax classification are two different decisions.

Public-service pensions require a separate check. A pension connected with service to the UK government, a local authority or another public body may fall within the government-service article, and nationality conditions can matter. A former employee of a commercial company, even a company with public ownership or a public contract, is not automatically in the public-service category. Obtain the identity and legal status of the former employer, the pension scheme, the source of the contributions and the wording of the provider’s award letter. A table separating State Pension, private workplace pension, public-service pension and pension savings is often the quickest way to expose a mixed classification.

Article 24 of the convention deals with the elimination of double taxation. It is not a general permission to omit a payment from the French return. The Conseil d’État advisory decision no. 435907 of 12 February 2020 considered the condition for a French resident to obtain a treaty credit and stated that cette condition n’exige pas que les revenus en cause aient été soumis à une imposition effective. The same opinion explained that the income must still be included in the relevant UK tax base and that declaring it in the United Kingdom can be important even where no UK tax is ultimately paid. The decision concerns treaty-credit conditions; it does not turn a French-taxable private pension into an exempt payment.

This distinction matters when a British provider has used the phrase “tax-free”. That phrase may mean that UK income tax was not withheld at source, that the payment was within a UK allowance, that the provider expects the recipient to settle tax through a return, or that the payment was treated as a tax-free component under UK domestic law. It does not answer the French question. The GOV.UK pension guidance explains that pension payments and large lump sums can affect UK tax calculations and that HMRC may need information to recalculate tax. Use that guidance for the UK side, while applying the treaty and French code to the French side.

Residence must also be fixed for the payment year. A person who moved from the UK part-way through a tax year may have a split-year issue under domestic rules, a treaty tie-breaker question or different periods of residence under each country’s legislation. The date the payment became available, rather than the date the bank statement was downloaded, may determine the tax year. If the payment followed a move, a return to the UK, a period of work abroad or a change of home, prepare a day-by-day residence chronology and retain travel, home, family and employment evidence. A pension analysis built on the wrong residence status can fail before the 7.5% question is reached.

Exchange rates and gross amounts create another recurring error. The French return needs a defensible euro amount for the taxable event. Do not use the net amount after a UK deduction if the French rule requires the gross capital, and do not convert a later transfer date when the payment was legally received earlier. Keep the provider’s gross statement, the payment date, the bank credit, the exchange-rate source and any UK tax certificate together. If the French calculation and the HMRC calculation use different bases, set them out in a reconciliation rather than assuming that one country’s net figure is the other country’s taxable amount.

The general pension guide already published by the British Desk explains the ordinary treaty and declaration framework for UK pensions in France. The present article addresses the narrower capital-payment issue: whether the one-off amount is a pension in capital, whether the 7.5% option is available and what to do if the authority refuses that treatment. A separate guide to declaring UK pensions in France after Brexit should be used for recurring pensions, treaty residence and the general forms. A French assessment already under dispute calls for the more targeted procedure for challenging a French reassessment of UK pension income.

II. How can I claim the 7.5% French tax rate or challenge an overcharge?

A. Can I use the 7.5% French tax regime for a pension paid as capital?

The 7.5% mechanism is an option with conditions, not a default rate for anyone who receives a large payment at retirement. The French legal expression prélèvement libératoire means a levy that discharges the income from ordinary income tax. It is attractive only after testing the scheme, the contribution history and the way the rights were liquidated. A taxpayer who selects the rate without proving the conditions may face a reassessment at the progressive scale, social-charge consequences and late-payment interest.

Article 163 bis, II of the General Tax Code provides: Les prestations de retraite versées sous forme de capital imposables conformément au b quinquies du 5 de l’article 158 peuvent, sur demande expresse et irrévocable du bénéficiaire, être soumises à un prélèvement au taux de 7,5 % qui libère les revenus auxquels il s’applique de l’impôt sur le revenu. The same article states that the levy is based on the capital reduced by a 10% allowance, and that it applies when the payment is not split and the beneficiary proves the relevant tax treatment of the contributions. The words “express and irrevocable” should be taken seriously: the choice should be made deliberately in the return and supported by a file that could answer a later query.

There are two central conditions. First, the payment must not be fractioned in the sense relevant to the scheme. A complete liquidation paid in one instalment may qualify. A partial withdrawal while the taxpayer retains a contractual right to take further capital later may not. A payment made partly as a pension and partly as capital can require a close review: the capital portion may be considered only if the rights have been properly liquidated and the remaining rights can no longer be taken as another capital payment. Ask the provider whether the payment exhausted the relevant rights, rather than relying on the fact that the bank transferred the money once.

Second, the contributions made while the rights were built must have been deductible from taxable income or connected with income exempt in the state that had the taxing right. This is an evidence question, not a presumption. Request the scheme’s contribution history, the employer’s contribution policy, payroll records, payslips, annual statements and any UK explanation of tax relief. If the plan changed employer, country or administrator, preserve the documents for each period. A provider may confirm the gross capital but be unable to confirm whether earlier contributions were deductible; that gap should be addressed before the return is filed.

French guidance supports the same approach. The current official 2041-GG declaration guidance deals specifically with foreign retirement benefits paid as capital and explains the distinction between ordinary progressive taxation and the 7.5% option. The official material also indicates that the option is not available for every newer French retirement-savings product. Article 163 bis excludes specified plans and products, including the French plan referred to in Article L. 224-1 of the Monetary and Financial Code. A UK scheme must therefore be analysed by its legal features; it should not be forced into a French product category simply because both are called a pension.

The 10% allowance is not the ordinary capped allowance applied to recurring pension income. It is calculated on the capital for which the 7.5% option is exercised. For illustration only, if the accepted French capital is €100,000, the notional base after the 10% allowance is €90,000 and the 7.5% income-tax levy would be €6,750. That illustration excludes exchange-rate questions, social charges, treaty credits, other income and any issue about whether the capital is fully eligible. It must not be used as a filing calculation until the scheme documents and the tax year are checked.

The declaration line matters. The current French forms and instructions identify specific boxes for capital retirement benefits taxed at 7.5%, while ordinary pension income is reported elsewhere. A pre-filled line may be wrong because the French administration did not receive the UK provider’s information or because the amount was converted into the wrong category. Compare the draft return with the provider statement and make a written note of the legal basis for the selected line. If the online return does not allow the situation to be described accurately, submit an explanatory message and retain the acknowledgement.

Do not select 7.5% merely because it is lower than the progressive rate. The option can be unsuitable or unavailable where the payment is a capital withdrawal from contributions that were never deductible, an investment product whose gain is taxable under another category, a fractionated drawdown, a transfer rather than a benefit, or a payment covered by a specific exemption. The updated BOFiP guidance on retirement benefits paid as capital provides administrative detail on the conditions and the proof of a non-fractioned payment. It is useful evidence of the administration’s reading, but the statute and the facts remain controlling.

A useful pre-filing file contains four sections: the treaty-residence evidence; the scheme and payment documents; the contribution and tax-relief evidence; and the French declaration calculation. Add a one-page chronology from the opening of the scheme to the payment. Identify every payment date, every earlier withdrawal, every transfer and every remaining right. If part of the account relates to non-deductible contributions or investment growth, split the analysis instead of presenting one unexplained gross figure. This preparation both supports the 7.5% request and creates the evidence needed if the tax office later says the payment was ordinary investment income.

B. How do I correct the return and reclaim tax from France or HMRC?

If the return has not yet been filed, correct the classification before submission. If the return was filed with the wrong line or without the 7.5% request, use the available correction process and send a written explanation referring to the payment date, scheme, gross amount, euro conversion, legal category and requested treatment. The French term réclamation contentieuse means a formal tax claim asking the administration to reduce or refund an assessment or payment. It is different from a general message asking for information, although an initial message can help identify the correct tax office and preserve the chronology.

The declaration duty itself is broad. Article 170 of the General Tax Code states: En vue de l’établissement de l’impôt sur le revenu, toute personne imposable audit impôt est tenue de souscrire et de faire parvenir à l’administration une déclaration détaillée de ses revenus. The fact that a payment is disputed, treaty-relieved or ultimately eligible for a credit does not make it safe to omit. Report the amount in the appropriate way, explain the treaty position and claim the relief that follows from the classification. An omission can create a more serious procedural problem than a transparent but contestable classification.

When the French tax office refuses the 7.5% rate, the response should identify the exact reason. Common reasons include an alleged fractionated payment, insufficient proof that contributions were deductible, a finding that the payment was not a pension, an excluded plan, an incorrect gross amount or a disagreement about the tax year. Ask for the calculation and the legal basis. Then answer each reason with a document and a short calculation. A table with four columns—administration’s position, correct fact, supporting document and requested correction—makes the claim easier to audit.

If you agreed with a proposed correction or failed to respond within the permitted period, the right to contest the final amount is not automatically lost. Article R*194-1 of the Book of Tax Procedures provides, in the relevant situation, that the taxpayer may obtain a discharge or reduction by demonstrating that the assessment is excessive: il peut obtenir la décharge ou la réduction de l’imposition, en démontrant son caractère exagéré. The burden and the available arguments depend on the procedure used. Obtain the notice, proposal, response, assessment and payment record before choosing the pleading route.

A refund claim also has a time limit. The current Article R*196-1 of the Book of Tax Procedures sets the ordinary framework for claims concerning income tax and other taxes, with the relevant deadline depending on the tax and the event challenged. The date shown on an assessment is not always the only date that matters. A claim should be sent as soon as the error is identified, even if the taxpayer believes that the final statutory deadline remains open. State the tax year, assessment reference, legal grounds, amount paid, amount claimed and the documents attached. Keep proof of transmission and a copy of the complete submission.

The administration’s power to reassess has its own limitation period. Article L169 of the Book of Tax Procedures states the ordinary three-year period for income tax, subject to the exceptions written into the article, including certain undeclared foreign-asset situations and a false foreign tax domicile. This rule is not a licence to wait. It is a reason to identify the year, the category declared and the foreign-contract reporting position at the outset. If the administration has alleged non-disclosure of a foreign contract or a false residence, take that allegation separately from the narrower question of the lump-sum tax rate.

Where the French tax office has already issued a proposition de rectification—a proposed tax correction—answer before the deadline in the letter and request the documents used for the calculation. State whether you accept, partially accept or reject each adjustment. If the authority has reclassified the whole payment as investment income, the response should explain whether the legal basis is Article 120, Article 79 or another provision, and whether the taxable amount should be limited to the investment return rather than the gross capital. The Bordeaux decision above shows why the category and the amount can be disputed separately.

The French and UK claims must then be coordinated. If HMRC or the UK provider withheld tax, use the current GOV.UK guidance for pension tax when living abroad and the relevant treaty-relief process. Provide the UK authority with the French residence evidence, the pension statement, the French tax position and any certificate or assessment it requests. Do not describe a French 7.5% levy as if it were automatically UK income tax, and do not retain a UK credit for tax that is later refunded. If the payment falls under a government-service provision or a special UK rule, the forms and competent authority may differ.

For a practical file, include: the UK provider’s full payment statement; scheme rules; evidence of the date and amount of every contribution; employer and employee contribution records; proof of tax relief or exemption in the country with taxing rights; the bank credit; exchange-rate evidence; the French return and acknowledgement; the tax notice; all messages with the service des impôts des particuliers; and any HMRC correspondence. Add a translation or a short bilingual glossary for terms such as “crystallised rights”, “drawdown”, “tax-free lump sum” and “uncrystallised funds”. The French administration should not have to guess what a UK technical expression means.

The remedy should be proportionate to the problem. A missing explanatory note may be corrected through the online service. A refusal of the 7.5% option may require a detailed claim with the scheme rules and contribution evidence. A reassessment with penalties, a foreign-contract allegation or a residence dispute can require a formal review of procedure, time limits and the suspension or payment consequences. Keep the payment and tax calculations separate from the wider Brexit narrative: the strongest submission identifies the legal category, the treaty article, the precise amount and the requested correction.

Conclusion

A UK pension lump sum received by a French tax resident after Brexit cannot be classified from the words “tax-free cash” or from the fact that it was paid once. French law can treat a capital-form retirement benefit as pension income, but a payment from an international or investment arrangement may instead fall within investment income. The France–UK treaty then allocates taxing rights according to residence, the nature of the pension and any public-service exception. Article 163 bis can provide a 7.5% French levy where the capital payment is not fractioned and the contribution history satisfies the statutory test, but the request is express and irrevocable and the proof should be prepared before filing.

The defensible route is to reconstruct the scheme, document the contributions, separate pension rights from investment gains, select the correct French declaration line and reconcile the French and UK positions. If the tax office refuses the rate or assesses the gross amount incorrectly, answer the stated reason with a legal rule, a calculation and a document, then use the appropriate claim within the applicable time limit. A review of the complete file is particularly important where the payment was partial, the taxpayer changed country during the year, the provider withheld UK tax or the arrangement combines employer contributions with investment returns.