A British citizen who sells ordinary UK shares after becoming tax resident in France usually has to analyse the disposal under French rules, even when the broker, the issuer and the settlement account remain in the United Kingdom. A capital gain is the profit made when an asset is sold for more than its tax-recognised acquisition cost. An ordinary taxable brokerage account means a normal investment account outside an ISA, pension, French PEA or company structure. Brexit changed the cross-border setting, but it did not make a UK share disposal invisible to the country where the investor lives.
The decisive sequence is practical: establish treaty residence for the year of sale, identify the exact asset and legal event, calculate the gain in euros, test the France–UK convention, then complete the French return and the foreign-account declaration where required. Dividends, interest, employee share options, an ISA withdrawal, a pension distribution and the sale of a property-rich company are not interchangeable with an ordinary listed-share disposal. Each has a different legal classification.
This guide is for a British reader settling in France after Brexit and holding UK shares personally, often through a UK platform or an overseas broker. It explains the normal private-portfolio case, the treaty exceptions that can change the result, the evidence to preserve and the response to an incorrect assessment. It does not cover buying French property or creating a company. For the wider residence and first-return chronology, see the British desk’s guide to the first French tax return after moving from the UK.
I. How are UK shares taxed in France after Brexit?
A. What is the French tax treatment of a UK share sale?
Begin with the person, not the broker. French domestic residence and treaty residence are related but distinct questions. Article 4 B of the French General Tax Code, or Code général des impôts (CGI), identifies the main connecting factors for a French tax domicile: the household or principal stay, professional activity and centre of economic interests, subject to the applicable tax treaty. Its wording includes Les personnes qui ont en France leur foyer ou le lieu de leur séjour principal
. Read the current Article 4 B of the CGI with the facts of the year concerned.
A British passport does not keep an investor within the UK tax system for every disposal. A French residence permit does not settle the tax answer by itself either. Make a dated chronology showing when the family home moved, where the person actually lived, where work was carried out, where professional and investment decisions were made, and how many days were spent in each country. If both domestic systems regard the person as resident, the residence article of the France–UK convention must be applied. The brokerage account’s address is evidence, not the residence test.
For a person who is French tax resident, the French domestic rules generally bring private investment gains into the French analysis. The principal charging provision is Article 150-0 A of the CGI. It covers, subject to its conditions and exceptions, net gains from the disposal for value of securities, company rights and equivalent instruments. The opening formula is les gains nets retirés des cessions à titre onéreux
. In plain English, a sale of shares for consideration is the event to examine; the fact that the shares are UK shares and the proceeds first arrive in sterling does not remove that event from the French return.
A disposal is different from a dividend. A dividend is a distribution made by a company to its shareholder; it is not the profit calculated by comparing the sale price with the acquisition cost. Interest on cash is different again. A transfer between two accounts, a deposit of your own money and a sale settlement are not automatically income. Keep the transaction statement so that the administration can see whether the cash movement represents a disposal, a distribution, a refund of fees or a personal transfer.
The gain calculation is governed by Article 150-0 D of the CGI. Its current wording states that the gain is formed by the difference between the effective disposal price, net of fees and taxes paid by the seller, and the effective acquisition price, with specific adjustments where relevant. The text begins: Les gains nets mentionnés au I de l’article 150-0 A sont constitués par la différence entre le prix effectif de cession des titres ou droits
. The rule is more precise than an annual broker headline such as “profit in GBP”.
For each line or tax lot, preserve at least:
- the security name, ISIN or other identifier and the number of shares sold;
- the acquisition date, acquisition price and acquisition fees;
- the disposal date, gross proceeds, selling fees and taxes charged to the seller;
- stock splits, mergers, demergers, rights issues, scrip issues, transfers and any corporate action affecting the acquisition cost;
- the sterling figures and the euro conversion method used for the acquisition and disposal; and
- the broker’s calculation of gains and losses, reconciled to the individual transactions rather than accepted without review.
If several shares of the same class were bought at different prices, the French calculation can require a weighted average acquisition value. Article 150-0 D contains a specific rule for a series of securities of the same nature acquired at different prices. Do not select the cheapest lot merely because it produces a more convenient result, and do not assume that the broker’s UK tax-lot method is the French method. Where stock transfers or inherited shares are involved, identify the legally recognised acquisition value before calculating anything.
Currency is a frequent source of error. A gain is not necessarily calculated by converting a final sterling profit at the year-end exchange rate. The acquisition and disposal prices, fees, distributions and taxes need to be converted using a consistent method applicable to the relevant French return and supported by records of the rate and date. A report that gives a single GBP gain can be useful evidence, but it may not reproduce the French euro calculation. Prepare a reconciliation with one line for the broker’s figure, one line for the French euro calculation and a note explaining every difference.
Losses must also be recorded. A loss on one UK share can interact with gains on other securities in the same household’s private portfolio, subject to the French rules and the applicable reporting year. The result is not improved by omitting a losing sale. A complete transaction ledger makes it possible to identify the net result and to preserve a potential carry-forward claim where the legislation allows one. The same ledger helps distinguish a genuine loss from a currency-only difference or a broker fee that was already deducted.
For disposals falling within the ordinary private-portfolio regime, Article 200 A of the CGI sets the income-tax rate framework. For the relevant gains, the default income-tax rate is 12.8 per cent unless a valid global election for the progressive scale is made. Article 200 A also provides that foreign-source investment income is taken gross and that a source tax is credited only within the credit permitted by an international convention. The exact wording includes Les revenus mentionnés au premier alinéa du présent 1° de source étrangère sont également retenus pour leur montant brut.
For 2026, official French tax guidance presents the ordinary flat-tax calculation for private movable gains as 12.8 per cent income tax plus 18.6 per cent social levies, a combined 31.4 per cent where the ordinary charges apply. The relevant impots.gouv.fr guidance on movable capital gains records that current position. The social-levy question must remain separate from the income-tax question. A person covered by the United Kingdom’s health system and not dependent on a compulsory French social-security scheme may have a different CSG and CRDS position, while the solidarity contribution may still need to be examined. Do not copy a 30 per cent historical calculation into a 2026 return without checking the year and the person’s affiliation.
The progressive-scale option is global for the categories to which it applies. It is not a choice made share by share after seeing which disposal was profitable. Compare the default rate and the option using the household’s full investment income, gains, losses, other income and available allowances. An election that appears advantageous for one £20,000 sale can produce a worse result when dividends, interest and a spouse’s income are included. Keep the calculation that explains why the selected method was used.
Consider a simple illustration. A taxpayer buys listed shares for £20,000, pays £100 of acquisition costs, sells them years later for £35,000 and pays £150 of selling costs. The working paper should not simply describe the result as a £14,900 gain and then convert that number once at 31 December. It should identify the relevant dates, calculate the disposal and acquisition values in euros under the applicable method, include the allowable fees, and then test any losses or special rules. The illustration does not provide a tax result for an individual file; it shows why the sterling account statement is only the starting document.
When shares were received by gift, inheritance, exchange, employee plan or corporate reorganisation, the ordinary purchase-price analysis can be wrong. An exchange can carry a deferred gain. Employment-related options can contain an employment or option gain distinct from the later investment gain. Shares received from a company can be a distribution or remuneration rather than an acquisition made at the cash amount shown in a platform. Stop the calculation and classify the event before using Form 2074.
An ISA, pension and French PEA are also outside the simple case described here. A UK Individual Savings Account is a UK tax wrapper; its UK relief does not automatically import a French exemption. A French plan d’épargne en actions (PEA) is a separate French product with its own statutory conditions. A pension distribution is analysed under pension and treaty provisions, not as a share sale. The British desk’s guide to a UK ISA after Brexit deals with that wrapper separately. Keeping these pages distinct prevents an ISA, pension or ordinary account from being reported under the wrong legal category.
B. When can the France–UK treaty change the result?
The 2008 France–UK Double Taxation Convention is still the starting treaty for income and capital gains. The official GOV.UK version in force contains Article 14 on capital gains. The French publication should also be retained: the convention as published in the Journal officiel on Légifrance. The treaty allocates taxing rights; it does not replace the domestic calculation of the gain, remove the declaration obligation or transform an ordinary brokerage account into an exempt wrapper.
Article 14(5) provides the ordinary allocation rule for assets not covered by the preceding paragraphs: Gains from the alienation of any property other than that referred to in paragraphs 1, 2, 3 and 4 shall be taxable only in the Contracting State of which the alienator is a resident.
For a person who is treaty-resident in France and who sells ordinary listed UK shares held as a private investment, this wording normally points to France as the state with the principal taxing right. The conclusion depends on the classification of the shares, the residence result and the other paragraphs of Article 14; it should not be reduced to the slogan “Brexit means France” or “the shares are British, so the UK taxes them”.
Article 14(2) creates an important property-related boundary. It covers gains from certain shares, interests in partnerships or trusts whose value is derived principally from immovable property situated in a contracting state. The treaty wording excludes shares regularly traded on an approved stock exchange from one part of that rule, but a private company or a property-rich structure may fall within a different analysis. A British resident in France selling ordinary listed shares in a trading company is not in the same position as a shareholder selling a substantial interest in a company whose value is mainly French or UK real estate.
The French tax administration’s BOFiP explanation of the France–UK convention confirms that Article 14(2) can allow France or the United Kingdom to apply domestic rules to shares or rights in a property-rich company. It also explains the former-resident rule in Article 14(6). Read this guidance together with the treaty text, not as a substitute for it. BOFiP commentary can clarify the administration’s position, while the treaty and the CGI remain the legal sources against which a challenge is argued.
Article 14(6) is especially important after a cross-border move. It states: The provisions of paragraph 5 shall not affect the right of a Contracting State to levy according to its law a tax chargeable in respect of gains from the alienation of any property on a person who is, and has been at any time during the previous six fiscal years, a resident of that Contracting State or on a person who is a resident of that Contracting State at any time during the fiscal year in which the property is alienated.
This is not a general rule that every UK share sale is taxed twice. It is a treaty reservation that must be read with the domestic law of the state claiming the tax and with Article 24’s double-tax relief mechanism.
The wording matters in two directions. A person now resident in France may still have a UK issue if the UK domestic rules charge a gain under a specific exception and the treaty preserves that right. A person who left France may face a French rule for a substantial participation or a deferred gain where Article 14(6) and domestic law operate together. The fact that the person moved before the disposal does not answer the six-fiscal-year test; build the residence chronology and identify the company, asset and date.
The French administration’s interpretation of the six-year rule is visible in the litigation concerning former residents. In CAA Versailles, 1st chamber, 19 October 2021, no. 20VE01265, a former French resident sold all of his shares in a French company after becoming UK resident. The court recorded a sale of €2,775,000 and a declared gain of €2,606,537, then examined Article 244 bis B of the CGI and Article 14(5) and (6) of the treaty. It held that the treaty permitted France to tax the gain in that fact pattern because the taxpayer had been French resident during the relevant previous period. The case is not a rule for every British resident in France selling a listed UK share; it is a warning that substantial interests and former residence can change the answer.
The distinction between ordinary shares and employment-related rights appears in CAA Paris, 9th chamber, 22 September 2023, no. 21PA04416. The court examined gains connected with the exercise and disposal of share options, a foreign securities account and the France–UK convention. Its conclusion included the exact phrase les gains en litige ne sont taxables, en tout état de cause, qu’au Royaume-Uni
, meaning that, on the facts before it, the gains were taxable only in the United Kingdom. The decision cannot be copied into an ordinary portfolio calculation: options, the deceased holder’s rights, the taxpayer’s residence and the treaty classification were all material. Its practical lesson is to identify the legal source of the gain before deciding which state may tax it.
A third case illustrates deferred taxation rather than an everyday share sale. In Conseil d’État, 8th and 3rd chambers réunies, 19 July 2016, no. 360352, the court considered a deferred exchange gain involving a taxpayer who had been UK resident. It stated that la circonstance que la plus-value de cession soit imposable dans un autre Etat est sans incidence
on the power of the state that had the right to tax the exchange gain when the relevant event ends the deferral. The decision concerns historic legislation and a deferred exchange, not a routine acquisition of listed shares. It matters because an old reorganisation can remain in the cost-basis file when the replacement shares are eventually sold.
The UK domestic position must be checked alongside the treaty. GOV.UK says that a person who is not UK resident does not usually pay UK Capital Gains Tax when selling most UK assets, and identifies exceptions including UK property or land, assets used in a UK branch and certain returns to the United Kingdom. The relevant GOV.UK guide to selling assets while living abroad also distinguishes UK shares from UK land. “Usually” is important: a special statutory rule, a return within the temporary non-residence period, employee securities, a property-rich structure or a different legal asset can alter the UK result.
If the UK taxes an item that France also includes, do not deduct the UK amount from the sale proceeds. Apply Article 24 of the treaty. The official treaty text sets out the French credit method and the special rules where Article 14(6) applies. The Article 24 provisions require the taxpayer to identify the income or gain, the state that taxed it, the tax actually paid and the applicable limitation. A credit is not a refund of every amount shown on a broker’s statement, and a UK tax that was merely calculated but never paid may not support the same claim.
Article 30 of the convention is also practical. A person claiming treaty benefits can be required to give the tax administration a detailed description and value of the income or gain, residence evidence and other proof. Preserve a certificate of UK residence where relevant, the UK computation or payment evidence, the French residence documents, the treaty article relied upon and the calculation of the French tax attributable to the gain. A treaty claim is easier to defend when the working paper explains why Article 14(5), Article 14(6), Article 24 or Article 14(2) applies rather than citing “the treaty” in general terms.
Do not confuse the capital-gains article with the treaty articles on dividends and interest. A dividend paid by a UK company is normally analysed under Article 11 and the French investment-income rules. Interest is analysed under Article 12. The British desk’s separate guide to UK dividends and UK REIT distributions addresses those issues. A broker statement can show a dividend, a sale and interest on the same page; the French return should not group them together merely because the cash was received on the same day.
II. How should a British resident in France declare a UK share sale and challenge an error?
A. Which French forms and documents are needed?
The French filing normally has two separate dimensions: the capital gain itself and the existence of a foreign financial account. The forms may be completed online, but the legal distinction remains. The current impots.gouv.fr answer on a sale of shares says that a taxpayer who sold shares in the previous year should complete the relevant Form 2074, giving the type of securities, purchase and sale prices and dates, unless the financial institution calculated the gain or loss in full. The totals are then carried to the relevant annual income declaration.
Form 2074 is the French declaration of capital gains and losses on disposals of securities, company rights and similar instruments. The official Form 2074 page provides the current version and notices. Use the version for the tax year being filed. A UK broker may provide a tax certificate, but that certificate does not replace the French form where the institution has not calculated the French gain, where the account is foreign, or where corporate actions, losses, options, inherited shares or currency require a reconstruction.
Form 2042-C, the additional French income-tax return, is used for the relevant totals and categories. The exact online boxes can change. A taxpayer should follow the current notice and keep a screenshot or PDF of the submitted lines. If a treaty credit, foreign tax or special category is involved, the foreign-income annex may also be relevant. Do not assume that Form 2047, the French foreign-income schedule, replaces Form 2074: a foreign source and a capital gain are not reasons to omit the capital-gains schedule. Conversely, do not add the same gain twice merely because two annexes refer to foreign income.
Article 170 of the CGI expresses the declaration duty. It states that toute personne imposable audit impôt est tenue de souscrire et de faire parvenir à l’administration une déclaration détaillée
of income and the elements needed to calculate French income tax. The same article addresses products received from abroad directly or through an intermediary. Consult the current Article 170 of the CGI when a broker, nominee or foreign platform argues that the payment is outside the French reporting system. The location of the account does not transfer the taxpayer’s filing duty to the broker.
The foreign-account duty is separate. Article 1649 A of the CGI requires French-domiciled individuals to declare the references of foreign accounts opened, held, used or closed during the relevant year. The statutory text refers to les références des comptes ouverts, détenus, utilisés ou clos à l’étranger
. The practical declaration is generally Form 3916 or Form 3916-bis attached to the annual income return, subject to the form and instructions for the relevant year. Declaring the account does not mean declaring its balance as income. It also does not remove the need to report a gain arising from a disposal in the account.
For a UK investment platform, record the legal account holder, provider name and address, account number or reference, opening and closing dates, and whether the account was used during the calendar year. If a platform migrated from a UK entity to an EU or French entity after Brexit, document the transfer and the dates rather than reporting one account for the entire period. If the same portfolio uses several accounts, identify each one. If an account is held jointly, or if the taxpayer can operate another person’s account, obtain advice on the correct declaration status instead of assuming that the statement’s name controls.
Build an evidence pack before submitting. It should contain the broker’s annual statement, full transaction export, individual contract notes, corporate-action notices, acquisition records, proof of fees, the exchange-rate source, the euro calculation, the French forms, any UK tax computation and proof of tax paid. Add the residence chronology and the treaty analysis when the person moved during the year or when the UK has made a tax claim. Keep the original files in an unaltered folder and work from copies. A spreadsheet that changes silently after filing is difficult to defend.
Use a transaction table with these columns: disposal date, security identifier, shares sold, sterling proceeds, sterling acquisition cost, fees, euro proceeds, euro cost, gain or loss, French form line and supporting document number. For inherited or gifted shares, add the transfer document and the tax value. For a company reorganisation, add the exchange ratio and the provision under which the old cost continues or is adjusted. For a share split, add the new number of shares and the unchanged total cost. This table turns a long broker export into a file that can be checked by the taxpayer, adviser and tax office.
Check the account and income deadlines together. The French return generally covers the preceding calendar year, while UK tax years and broker reports may use different periods. A UK statement from 6 April to 5 April cannot be pasted into a French calendar-year return without separating the transactions. Use the individual contract notes and the dates of disposal. The date on which the cash was withdrawn to a French bank account is not necessarily the date on which the shares were sold.
Check the French tax year for the social-levy rate as well. The current impots.gouv.fr guidance on movable investment income states that the rate changed for the relevant 2026 period and distinguishes the treatment of people insured under another qualifying system. A British pensioner, a person working in France and a person remaining insured through the United Kingdom may have different social-levy outcomes. The evidence of affiliation should be held with the tax calculation, not added only after an assessment has been issued.
There is a special boundary for a person who is leaving France rather than settling there. The French exit tax is a regime that can tax certain unrealised gains when a person transfers their tax domicile out of France, subject to thresholds, residence history, deferral and later events. The official impots.gouv.fr exit-tax guidance explains the relevant declaration and threshold questions. It is not a substitute for the ordinary sale analysis in this article, but a deferred gain created before a move can reappear when replacement shares are sold. Ask for the original exit-tax or exchange documents if the portfolio has a long French history.
B. How can you correct a French assessment or defend the treaty position?
Do not wait for a tax dispute to assemble the file. Before filing, compare the broker’s report with the contract notes, identify missing cost bases, separate dividends from sales and confirm whether the account declaration has been completed. After filing, download the acknowledgement and retain the submitted calculation. If the tax notice does not match the return, compare the declared gain, the netting of losses, the applied rate, the social levies and any treaty credit line by line.
A common error is to report the cash received rather than the gain. A second is to report a broker’s “profit” without checking whether it uses a US-dollar or sterling cost basis, a different lot rule or a different tax year. A third is to claim a UK credit for an amount that was not actually paid. A fourth is to report a UK account but omit a disposal because the proceeds remained in the account. Each error requires a different correction and evidence set.
If an online return is still within the permitted correction window, use the official correction route and save the amended acknowledgement. Explain in a short note what was entered, what should replace it, the tax year, the relevant account and the supporting document. If the notice has already been issued, use the secure messaging route or the formal claim process indicated by the French tax administration. The claim should identify the assessment, the disputed line, the requested change and the calculation of the corrected tax, rather than merely saying that the taxpayer has been taxed twice.
When the dispute concerns residence, include the chronology: arrival date, French home, UK home, work location, travel days, family circumstances, bank and investment management, and the residence certificates or correspondence exchanged with either administration. When it concerns the gain, include the transaction table and the source documents. When it concerns the treaty, quote the precise Article 14 paragraph, identify the asset and explain why the other paragraphs do or do not apply. When it concerns a credit, show the UK tax actually paid, the corresponding gross gain, the French tax attributable to that gain and the treaty limit.
Article 14(6) disputes need particular care. The six-fiscal-year period is not the same as “six calendar years since the move”, and the relevant state, tax year and residence status must be identified. The CAA Versailles judgment no. 20VE01265 shows how the court analysed the words of the convention, the former French residence and the substantial shareholding together. It is a useful warning against relying on a generic internet statement that a treaty always gives the country of current residence exclusive taxing rights.
A classification dispute involving options or an employee plan should not be answered with the ordinary 2074 calculation alone. The CAA Paris judgment no. 21PA04416 shows that the court may examine the legal origin of the rights, the account, the beneficiaries and the treaty article before allocating the gain. Gather the grant, vesting, exercise, transfer and disposal documents. If an employer or estate is involved, the employment or succession analysis may control the tax character before Article 14 is applied.
A deferred exchange or reorganisation requires the same discipline. The Conseil d’État judgment no. 360352 demonstrates that a gain placed into a deferral can be examined when a later disposal ends that deferral, even when another state taxes the later transaction. The taxpayer should obtain the original exchange statement, the historic French declaration, the replacement-share register and the later sale contract. A broker’s present-day cost basis may not disclose the deferred French gain.
If the French tax office rejects a treaty position, ask what it has rejected: residence, asset classification, source, beneficial ownership, the six-year exception, actual UK tax paid or the calculation of the credit. Respond to that reason. A treaty claim supported by a UK tax certificate is different from a claim supported only by the fact that the payer is a UK company. A gain from listed shares is different from a gain from a private company holding French property. A UK tax amount shown on an account statement is different from tax finally borne by the taxpayer.
The treaty’s evidence clause is operational. The current GOV.UK treaty text says that a person claiming treaty benefits can be required to present a declaration giving a full description and amount or value of the income or capital gain, a residence statement from the other administration and other evidence required under domestic law. Prepare those items before a claim. If a certificate is unavailable, explain the request made to the relevant administration and provide alternative official proof, but do not invent a treaty residence result.
Some disputes concern only a calculation, not the existence of a French taxing right. Recalculate the gain in euros, correct the cost basis, apply the permitted loss netting and ask for the tax notice to be amended. Other disputes concern a foreign tax credit. Recalculate the French tax attributable to the gain and apply the treaty cap. Others concern the account form or a penalty for an omitted account. Keep the account-reporting analysis separate from the income calculation; a declaration of the account may be corrected even when the gain calculation is right.
Do not use the UK’s annual allowance or ISA language as a response to a French assessment. The UK allowance applies under UK rules and a UK ISA is a UK wrapper. If the asset was held in an ISA, use the separate wrapper analysis; if it was held in a pension, use the pension treaty analysis; if it was held through a company, obtain company and distribution advice. This article is deliberately limited to a personally held ordinary share portfolio, so that a tax office or court can see exactly which facts the cited rules address.
A short decision path can prevent most errors:
- Were you French treaty-resident on the disposal date, or did the move create a split-year or dual-residence issue?
- Was the asset an ordinary listed share held personally, rather than an ISA, pension, option, trust interest or property-rich company?
- What are the euro disposal price, euro acquisition value, allowable fees and net gain or loss under the current French rules?
- Does Article 14(2), 14(5) or 14(6) allocate a taxing right to France, the United Kingdom or both under a specific exception?
- Was any UK tax actually paid, and does Article 24 provide a credit with a French limitation?
- Have Form 2074, the annual income return and the foreign-account form been completed for the correct year without double counting?
If any answer is uncertain, preserve the documents before contacting the tax office or filing a claim. A clear uncertainty is safer than a confident but unsupported number. The useful file is one that lets a reviewer reproduce the gain, the residence result, the treaty allocation and the form entries without relying on a broker’s label or a remembered rule.
Conclusion
For a British person who has settled in France, selling ordinary UK shares from a normal brokerage account will usually require a French residence analysis, a euro-based capital-gains calculation and a Form 2074 review. Brexit does not eliminate the French filing obligation. The France–UK convention normally gives the state of treaty residence the right to tax an ordinary disposal, but the property-rich share rule, the former-resident six-year reservation, deferred gains, options and UK domestic exceptions can change the result.
The defensible approach is to separate the sale from dividends and interest, the gain from the account balance, and the treaty credit from the gross proceeds. Keep the contract notes, cost basis, currency calculations, account details, residence evidence and proof of any UK tax paid. Report the foreign account separately, use the current French forms and challenge an incorrect notice by identifying the exact asset, paragraph, calculation and document that support the correction.
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