{"id":2103882,"date":"2026-08-21T20:06:46","date_gmt":"2026-08-21T18:06:46","guid":{"rendered":"https:\/\/kohenavocats.fr\/2026\/08\/21\/challenge-french-tax-reassessment-uk-pension-france-brexit\/"},"modified":"2026-08-21T20:13:48","modified_gmt":"2026-08-21T18:13:48","slug":"challenge-french-tax-reassessment-uk-pension-france-brexit","status":"publish","type":"post","link":"https:\/\/kohenavocats.fr\/en\/2026\/08\/21\/challenge-french-tax-reassessment-uk-pension-france-brexit\/","title":{"rendered":"How to Challenge a French Tax Reassessment on UK Pension Income After Brexit"},"content":{"rendered":"

Receiving a French proposition de rectification<\/em> (formal proposed tax adjustment) about a UK pension after Brexit is not the same as receiving a final tax bill. It is the point at which the French tax authority explains the correction it is considering and gives you a short opportunity to answer. For a British person who has moved to France, the difficult question is usually not whether the pension came from the United Kingdom. It is how the pension is classified, where you were resident under the France\u2013UK tax treaty, which French return lines were required, and whether the authority has applied the correct exchange rate, tax credit or exemption.<\/p>\n

The treaty did not disappear when the United Kingdom left the European Union. The current 2008 UK\u2013France Double Taxation Convention remains in force and contains separate rules for ordinary pensions, government-service pensions and the elimination of double taxation. A UK tax deduction is not, by itself, proof that France must remove the assessment; nor does a French adjustment automatically mean that UK tax was lawful. Your response must deal with both systems and preserve each remedy. This guide sets out the evidence, deadlines and arguments to organise before you accept, reject or partly accept the proposed adjustment.<\/p>\n

The practical starting point is to compare the letter with the official guide to declaring UK pensions in France after Brexit<\/a>. The present article addresses the narrower crisis that follows: the French authority has already challenged your declaration, your pension classification or your treaty relief.<\/p>\n

I. Why has France reassessed my UK pension after Brexit?<\/h2>\n

A. When does the French tax office treat a UK pension as taxable in France?<\/h3>\n

The first question is residence. French domestic law uses several alternative tests. Article 4 B of the Code g\u00e9n\u00e9ral des imp\u00f4ts<\/em> (French General Tax Code, or CGI) describes a person whose tax home is in France as someone who has \u201cson foyer ou le lieu de son s\u00e9jour principal<\/q>\u201d, carries on a main professional activity there or has the centre of his or her economic interests there. The same provision adds that an international tax treaty can prevent a person who meets a domestic test from being treated as a French treaty resident. Read the current text of CGI Article 4 B<\/a> before relying on a single fact such as a French property, a French bank account or a British passport.<\/p>\n

For the return itself, CGI Article 170 requires an income-tax declaration and expressly covers income received from abroad. It says that a person with a French tax home who receives abroad, directly or through an intermediary, products referred to in Article 120 must include them in the return. It also requires certain treaty-exempt income to be reported where it is relevant to the calculation of tax on other income. The exact words are \u201ctoute personne imposable audit imp\u00f4t est tenue de souscrire et de faire parvenir \u00e0 l’administration une d\u00e9claration d\u00e9taill\u00e9e<\/q>\u201d. The official text is available at CGI Article 170<\/a>.<\/p>\n

That obligation to report is separate from the treaty question of who may tax the payment. HM Revenue and Customs describes the 2008 convention as the treaty in force between the two countries. Article 18 states that pensions and similar remuneration paid for past employment to a resident of a contracting state are taxable only in that state. In practical terms, an ordinary UK State Pension or private occupational pension received by a person who is treaty-resident in France will normally be dealt with in France, subject to the precise category of payment and any special provision. The treaty wording is: \u201cPensions and other similar remuneration paid in consideration of past employment to a resident of a Contracting State shall be taxable only in that State.\u201d Read the complete UK\u2013France Double Taxation Convention<\/a>, especially Articles 4, 18, 19 and 23.<\/p>\n

Do not apply Article 18 without checking whether the payment is a government-service pension. Article 19 has a different allocation rule for pensions paid by, or out of funds created by, a contracting state, a local authority or a French statutory body for services rendered to that state or body. Nationality can matter under the exception. A civil-service pension, armed-forces pension, injury payment, lump sum, annuity, drawdown payment or death benefit may therefore need a separate classification. HMRC\u2019s treaty summary distinguishes ordinary pensions from government pensions, and the convention itself contains a special exemption for certain pensions that are exempt in the source state.<\/p>\n

The French tax return may also have been completed on the wrong line. The official French tax guidance says that foreign pensions for a French tax resident must be reported on the main return and on form 2047, with the line depending on whether the payment produces a French-tax credit or is otherwise taxable in France. The guidance refers to lines 1AL to 1DL and 1AM to 1DM. Keep a copy of the filed form, the online confirmation, the calculation notice and any message sent through the secure tax mailbox. A dispute about a line or a credit is different from a dispute about the existence of the pension.<\/p>\n

French authorities may also challenge the evidence of UK treaty residence. In Conseil d’\u00c9tat, 14 February 1979, no. 06961<\/a>, the court held in the summary that \u201cne suffit pas \u00e0 \u00e9tablir qu’il soit r\u00e9sident du Royaume Uni<\/q>\u201d. The decision concerned the earlier France\u2013UK convention, not the current 2008 text, but its evidential warning remains useful: nationality and the source of a pension do not replace proof of residence. Supply the relevant HMRC residence material, day-count evidence, permanent-home information and treaty analysis rather than arguing from nationality alone.<\/p>\n

Finally, Brexit is often used as a label for a problem that is actually a domestic filing or classification issue. The withdrawal from the European Union changed immigration and social-security routes, but it did not abolish the bilateral tax treaty. The letter should therefore be tested against the treaty in force for the relevant tax year, the French legislation in force for that year and the category of pension actually paid. A correction based only on \u201cUK income is foreign\u201d is not enough; a correction based on an omitted report, an incorrect credit or a misclassified government pension may be legally different.<\/p>\n

B. What does a proposition de rectification mean and what evidence matters?<\/h3>\n

A proposition de rectification<\/em> is the formal notice through which the French authority proposes to increase the tax base, remove a credit, add interest or apply a penalty. Under Article L. 55 of the Livre des proc\u00e9dures fiscales<\/em> (Book of Tax Procedures, or LPF), the contradictory correction procedure applies when the administration finds an insufficiency, inaccuracy, omission or concealment in the elements used to calculate tax. The official wording describes \u201cla proc\u00e9dure de rectification contradictoire d\u00e9finie aux articles L. 57 \u00e0 L. 61 A<\/q>\u201d. See LPF Article L. 55<\/a>. The article is currently applicable, with a scheduled change in 2027, so the date of the tax year matters.<\/p>\n

The notice must be sufficiently reasoned. LPF Article L. 57 says that the administration sends a proposed adjustment \u201cqui doit \u00eatre motiv\u00e9e de mani\u00e8re \u00e0 lui permettre de formuler ses observations ou de faire conna\u00eetre son acceptation<\/q>\u201d. It also requires the response of the administration to be reasoned when it rejects your observations. The current text is at LPF Article L. 57<\/a>. LPF Article R*57-1 adds that the notice must state the nature and reasons for the proposed adjustment and invites the taxpayer to send acceptance or observations within thirty days. The official wording begins: \u201cLa proposition de rectification pr\u00e9vue par l’article L. 57 fait conna\u00eetre au contribuable la nature et les motifs de la rectification envisag\u00e9e<\/q>\u201d. See LPF Article R*57-1<\/a>.<\/p>\n

Read the notice in this order:<\/p>\n