If you are a British heir dealing with a French asset, a French tax resident, or a death connected with France, the urgent question is often practical rather than theoretical: which French inheritance-tax return must be filed, by which date, with which office, and what can still be done if the deadline has passed? The French document is usually the déclaration de succession, meaning the French inheritance-tax return. It is commonly completed on form 2705-SD, with a continuation sheet where necessary. It is separate from the English probate process and from any UK Inheritance Tax account sent to HM Revenue and Customs (HMRC).

Brexit has not removed these French filing duties. It has, however, made the evidence more demanding. A British estate may involve a UK grant of probate, an English or Scottish will, assets in both countries, an executor who is not the person legally responsible for French tax, and two different rules for double taxation. A late return should not be left until the estate is fully distributed. The safest sequence is to identify the French connection, calculate the correct period from the date and place of death, assemble a defensible provisional file, file promptly, and reserve the right to correct figures once the UK and French valuations are final. This article explains that sequence, the legal exceptions, and the remedies available after a late or incomplete filing.

Where the immediate obstacle is a UK grant of probate, an apostille, a sworn translation or a French notary who will not accept the file, see our related guide on the UK executor’s documents for a French inheritance. That documentary problem is connected with the estate, but it does not by itself suspend the French tax deadline discussed below.

I. Which French inheritance-tax return does a British heir have to file, and when?

A. Is form 2705-SD required when the estate, heir or assets are connected with France?

The starting point is not the nationality written on the death certificate. It is the combination of the deceased’s tax residence, the heir’s tax residence, the location of the assets and any applicable tax treaty. French law uses the expression droits de mutation à titre gratuit, which means tax on transfers made without consideration, including inheritance tax. A British passport does not by itself create an exemption.

The French tax authority’s current form 2705-SD page states that, where the succession is accepted, filing a declaration is normally mandatory, subject to limited exemptions. The principal form is 2705-SD. The 2705-S-SD is a continuation sheet for a declaration that needs additional space, and 2705-A-SD is the partial declaration used for life-insurance benefits in the situations covered by that form. The notice 2705-NOT-SD should be read with the version of the form actually filed; an old PDF copied from a forum is not a reliable substitute for the current version.

The obligation is expressed in Article 800 of the French General Tax Code (the Code général des impôts, or CGI). It says that heirs, legatees and donees “sont tenus de souscrire une déclaration détaillée”, meaning that they must submit a detailed declaration. The same provision contains narrow thresholds for certain direct-line heirs, a surviving spouse or a civil-partnership partner, and for other beneficiaries. Those thresholds are not a general British-resident exemption. They depend on the gross estate, the relationship with the deceased and previous gifts that were not registered or declared.

The contents of the return matter as much as the existence of the form. Article 801 CGI requires the declaration to contain the names, forenames, dates and places of birth of the heirs, legatees or donees. It adds a specific difficulty for a British family: “Si la naissance est arrivée hors de France”, evidence of the date of birth must be supplied before registration, otherwise the highest potentially applicable duties may be collected subject to a later restitution claim. A certified or appropriately translated British birth certificate can therefore be more than a formality.

The declaration is not limited to the French house that first brought the family to a notary’s attention. Article 801 and the succession provisions around Article 800 CGI require the identification and description needed to calculate the tax. In practical terms, the file should address bank accounts, shares, pensions or death benefits where relevant, life insurance, loans, gifts, trusts, jointly owned assets, French real property, and the beneficiary’s legal status. A British executor should not assume that an asset absent from the French deed of ownership is irrelevant to the French return.

Territoriality is governed in particular by Article 750 ter CGI. Its structure is decisive for a British family:

• if the deceased was fiscally resident in France, French inheritance tax can reach French and foreign assets, subject to the relevant treaty and statutory conditions;
• if the deceased was not fiscally resident in France, French assets can remain within the French charge, including French land and certain French-connected rights;
• if the beneficiary is fiscally resident in France and has been resident there for at least six of the ten years before receiving the inheritance, French law can also reach foreign assets, again subject to treaty relief.

The words “tax resident” must be analysed rather than guessed from a council-tax address, a French residence card or the location of a bank account. The French tax residence test, the UK residence history and the date of death may produce different answers. In a British-to-France case, the France–UK inheritance-tax convention and the domestic rules of both states must be compared before the declaration is finalised.

The British side is not a formality either. Since 6 April 2025, HMRC has used a long-term UK residence framework for many deaths and transfers. Its official guidance on long-term UK residence explains that overseas assets may be within UK Inheritance Tax where the deceased is a long-term UK resident, and that the new rules should not simply be applied to an earlier death. The executor may also have to complete an IHT400 account and, where foreign assets are relevant, the IHT417 foreign-assets schedule. The French 2705-SD and the UK IHT400 are parallel compliance documents; one does not replace the other.

There is a practical difference between a French inheritance-tax return and a probate application. Probate proves, for the UK court and institutions, who can administer the estate. The French return reports the taxable estate and the persons receiving it. A UK grant may be a vital exhibit, but it does not automatically establish every French tax fact. The French tax office may still request the will, codicils, family documents, valuations, evidence of liabilities, proof of foreign tax paid and an explanation of the legal connection between the executor and the beneficiary.

The signature also carries legal weight. Article 802 CGI requires the declaration to end with a statement in which the declarant affirms that it is truthful. The exact statutory wording includes “Le déclarant affirme sincère et véritable la présente déclaration”. That statement is why a British executor should not sign a French return containing guessed figures without marking the uncertainty, explaining the valuation method and preserving a correction route. A short explanatory schedule is often safer than silently omitting an account or presenting an unsupported value as final.

A French notary may prepare the civil documents, but the tax responsibility does not disappear because a notary is involved. The acte de notoriété is the notarial deed identifying the persons entitled to inherit. The attestation de propriété is the deed used to establish a successor’s ownership of French real property. Neither document, by itself, is a complete substitute for the tax declaration. Where the estate contains a French property, the notary’s civil work and the executor’s tax evidence must be coordinated so that the asset, its value and the ownership chain tell the same story.

B. What is the deadline when the death or the heir is in the UK?

The basic deadline is set by Article 641 CGI. It provides six months from the date of death when the deceased died in metropolitan France and “D’une année, dans tous les autres cas.” For a British family, the second limb commonly applies when the death occurred in the United Kingdom or another country outside metropolitan France. The place of death is not the same question as the deceased’s domicile. A French resident who dies in England and a UK resident who dies in France can therefore face different statutory periods.

The six-month and twelve-month rules should be calculated from the date of death, not from the date on which the executor receives the grant, the date on which the notary opens the file, or the date on which a bank releases documents. If the last day falls on a non-working day, the filing office’s administrative guidance should be checked for the applicable extension. A British executor should record the death date, the place of death, the original deadline, the date documents were requested and the date the declaration was actually sent.

There is a narrow property-related extension under Article 641 bis CGI. It states that the period can be extended to twenty-four months for a succession containing immovable property or rights in immovable property where the deceased’s ownership had not been established before death by a duly registered or published deed, provided that the required notarial ownership certificates are published within that period. This is not a general twenty-four-month period for every French house inherited by a British person. If the property was already recorded and the delay is caused by a slow bank, a family disagreement or a translation problem, Article 641 bis should not be treated as an automatic safe harbour.

The place of filing is also important. Where the deceased was resident in France, the declaration generally goes to the registration service connected with the deceased’s French domicile. Where the relevant French file concerns a non-resident deceased, the current tax authority notice and the non-residents service instructions should be checked. The official impots.gouv.fr guidance on succession declarations distinguishes the six-month and twelve-month situations and identifies the service to contact. Do not send a time-critical return to a notary’s general email address and assume that the tax deadline has been preserved. Obtain evidence of delivery to the competent service.

The French deadline runs even where the British estate is still being argued over. The leading decision is Cass. com., 17 October 1995, no. 93-19.043. The Court held that a legal heir, seized of the estate by operation of law, had to file within the statutory period despite a dispute over the devolution. Its formulation is direct: “l’héritier légitime a l’obligation de procéder à la déclaration dans les délais légaux”. In French succession law, saisi de plein droit means legally vested in the deceased’s rights and assets without waiting for physical possession or a final distribution.

The same principle was applied in Cass. com., 26 March 2008, no. 07-11.703. A paternity claim that might have changed who inherited did not allow the existing legal heir to wait indefinitely. The Court referred to “l’existence d’un litige ayant pour objet de contester la dévolution successorale” as a matter that could not be invoked to avoid the filing obligation. For a British family, an ongoing challenge to a will, a dispute over an English intestacy position or a disagreement between siblings should normally be documented alongside a filing, not used as a reason to do nothing.

The Court applied the point to a death abroad in Cass. com., 18 October 2011, no. 10-25.074. The estate involved litigation connected with Israel and a declaration filed after the one-year period applicable to a death outside France. The lesson for a British executor is clear: a foreign probate dispute does not automatically stop the French tax clock. If the law applicable to the French asset or the existence of a French filing duty is genuinely uncertain, that uncertainty must be analysed and evidenced; it is not the same as waiting for every dispute in the foreign estate to end.

The date should also be separated from the ability to pay. A British beneficiary may know that tax is due but be unable to sell a French house, release a joint account or transfer money from the UK by the deadline. Article 1701 CGI states that inheritance duties are paid before registration and that “Nul ne peut en atténuer ni différer le paiement” merely because the amount is disputed. That does not mean a cash-poor estate has no options. It means that a payment arrangement must be requested through the proper procedure rather than inferred from the existence of an estate dispute.

The official Service-Public guidance on paying inheritance tax explains that a request for instalments or deferred payment can be made when the declaration is filed, subject to guarantees and interest. The estate may qualify for an arrangement in particular circumstances, including illiquid assets, but the request should be made at the time of filing and supported with cash-flow information. A payment request is therefore part of the filing strategy. It is not a reason to postpone form 2705-SD.

The first operational decision for a British executor is consequently binary: either file a complete return by the deadline, or file a carefully explained provisional return and immediately identify the items that will be corrected. Waiting for perfect information is often the more expensive choice because it leaves the estate exposed to interest, a statutory increase and the risk that the administration will calculate the liability without the evidence the family could have supplied.

II. What should a British heir do after a late or incomplete French return?

A. How should you file, correct and document form 2705-SD?

If the French deadline has passed, the first step is not a theoretical argument about Brexit. It is a controlled regularisation. Prepare a dated cover letter identifying the deceased, the date and place of death, the beneficiaries, the French assets or residence connection, the original deadline and the reason for delay. State whether the enclosed 2705-SD is complete or provisional. List every missing document and give a realistic date for supplying it. Ask the registration service to confirm the amount due, the payment reference and any required form for an instalment or deferred-payment request.

The cover letter should be in French or accompanied by a dependable French translation of the material parts. The return itself must use the official French form. A British executor can prepare an English working file for the family, but the tax office needs a coherent French declaration and supporting exhibits. Use a table that reconciles pounds and euros: identify the valuation date, the exchange-rate source, the amount in sterling, the euro amount used in the return and any subsequent adjustment. Keep the calculation reproducible.

The core evidence usually includes:

• the death certificate, with an appropriate certified translation if the office requires one;
• the UK grant of probate, letters of administration or equivalent Scottish document, together with the will and codicils;
• the family-status documents proving births, marriages, civil partnerships and the identity of each heir;
• a schedule of French and foreign assets at the date of death, including the title documents for French property;
• bank, investment, pension, life-insurance and trust statements, with an explanation of whether the benefit passes through the estate or by beneficiary designation;
• debts and liabilities that were legally deductible at the date of death, with invoices, loan statements or contracts rather than estimates;
• valuation reports for property, shares, businesses, valuable chattels and rights that cannot be valued from a bank statement;
• the UK IHT400, IHT417 or related HMRC correspondence where the UK estate is within Inheritance Tax, plus proof of UK tax paid or a clear explanation of why no tax was due;
• evidence of previous gifts, tax residence, foreign tax paid and any treaty claim; and
• a document index recording the source, date, currency and translation status of every exhibit.

Do not attach a document simply because it is available. Explain why it proves a fact in the declaration. For example, a UK probate document proves the executor’s authority, but it may not prove French tax residence. A bank statement proves the balance on a date, but not necessarily whether the account was joint, held on trust or payable outside the estate. A French land-tax notice can support ownership and local value, but it is not a market valuation. A short evidence note prevents the tax office from treating an unexplained attachment as an omission.

If the value of an asset is uncertain, use a provisional method openly. The official notice for form 2705 explains that an estimated value can be included with the initial declaration and later corrected by a rectifying declaration, with additional tax or a repayment depending on the result. The practical rule is to state the assumption and set a reminder for the corrective filing. A provisional return that identifies a disputed value is materially safer than a supposedly final return that omits the asset altogether.

The same approach applies to a missing UK document. If HMRC has not yet issued its final calculation, say so. If an English property valuation is being challenged, attach the report currently available and the correspondence showing the challenge. If a trust document is incomplete, identify the trustee, the governing law and the precise document still requested. The French office may disagree with the treatment, but it can assess a transparent file. It cannot assess an omission that is hidden behind the phrase “the UK estate is not finished”.

The correction must preserve an audit trail. Keep the signed form, the complete exhibit bundle, the French translation, the delivery receipt and every response from the administration. If the return was filed electronically by a notary or through a permitted service, obtain the transmission acknowledgement. If it was posted, use a method that records delivery and keep a scanned copy of the envelope and its contents. If it was delivered by a representative, obtain written confirmation of the date and the recipient service.

The corrections should be classified. A mathematical or exchange-rate error is different from a new liability discovered after the declaration. A newly confirmed debt is different from a disagreement over the value of a French property. A change in who ultimately inherits is different from an omitted bank account. Each category may need different evidence and can have a different impact on interest, penalties and the limitation period. Do not send a second “corrected” form without saying whether it replaces, supplements or disputes the first one.

The file should also distinguish the civil inheritance from the tax inheritance. A British will may be valid for the succession under the applicable law, while French tax still requires an asset to be disclosed. A beneficiary may have accepted the inheritance under English procedure but not yet received money. A French tax declaration can therefore be required before the distribution. Conversely, a person named in a UK probate document may not be the person liable for every French tax item. The tax analysis follows the statutory rules and treaty, not the label used by the foreign court.

B. Can you challenge interest, 10% or 40% penalties and double taxation?

There are three different arguments, and they should not be mixed. The first challenges the existence or amount of French inheritance tax. The second challenges the consequences of a late or incomplete return. The third asks for relief where both France and the UK tax the same asset. A letter that simply says “the estate paid tax in Britain” is not a complete challenge to a French penalty or a French assessment.

The current late-payment interest rule is in Article 1727 CGI. It states that a tax debt not paid by the legal deadline gives rise to interest and sets the rate at “0,20 % par mois”. This is interest, not the 10% or 40% increase. The estate should calculate each separately, identify the base on which the administration applied it, and check the dates used. The current Service-Public payment guidance also describes the 0.20% monthly interest and the possible increases in accessible terms.

The late-declaration increases are governed by Article 1728 CGI, whose current version distinguishes a 10% increase, a 40% increase after a formal notice is not complied with within the applicable period, and other cases. For succession declarations, the text also contains a specific rule connected with the statutory filing periods. Do not copy a percentage from an old forum post or from a pre-2026 tax note. Ask the administration to identify the legal paragraph, the date on which it says the return became late, the date of any mise en demeure (formal notice to file) and the calculation base.

A formal notice is not the same as an informal email from a notary or a request for missing documents. Preserve the envelope, delivery proof, French wording and date of receipt. If the notice was sent to an obsolete address while the administration had been told the correct address, that may become relevant to the calculation and to the ability to respond. It does not automatically cancel the underlying filing duty, so a protective filing should still be considered.

There is an important jurisprudential distinction between a legal heir and a genuinely contested universal legatee. In Cass. com., 5 March 1991, no. 89-18.298, the Court accepted, on the particular facts, that a universal legatee whose rights were challenged within six months and who had been placed under a judicial administrator “n’était pas jusque-là en mesure de déposer la déclaration de succession”. That decision is not a general delay privilege for every British executor. It concerned a specific judicial dispossession and a dispute over the claimant’s own rights.

The distinction was refined in Cass. com., 1 April 1997, no. 95-13.181, which held that, for the universal legatee in the circumstances of the case, the challenge could move the starting point to the date on which the rights were finally recognised, “indépendamment de toute dépossession”. This is an exception requiring a close match between the procedural facts and the case law. It should not be pleaded merely because the executor has not yet obtained a translated will or because beneficiaries disagree about the distribution.

By contrast, Cass. com., 8 March 2005, no. 02-12.721 confirms that a legal heir cannot simply defer filing or payment because she is challenging the share attributed to another person. The Court referred to the rule that “nul ne peut en atténuer ni différer le paiement” for that reason alone. If a British heir wants to preserve a challenge to the amount, the safer course is to file, pay or request an authorised payment arrangement, and then use the statutory claim or restitution route with evidence.

The administration’s ability to recover tax can also create an urgent cash problem. In Cass. civ. 1, 17 October 2019, no. 18-18.915, the court considered an estate with French assets, unpaid liabilities and a serious risk of a higher penalty after formal notice. The decision records the practical pressure created by unpaid duties and the need to manage assets so that the tax debt does not continue to grow. A British family facing an illiquid French property should use this logic operationally: obtain a valuation, request payment terms, identify a lawful source of funds and obtain advice before a co-heir’s refusal makes the estate unmanageable.

If the return was voluntarily corrected, Article 1727 CGI may help with interest. Its paragraph V allows a reduction of the interest in certain circumstances where a taxpayer files a spontaneous rectifying declaration before the administration’s recovery period expires, acts in good faith and pays the principal rights or satisfies the payment condition. This is not an automatic cancellation. The correction letter should therefore state the date of the original filing, the date the omission was discovered, why it was not deliberate, the additional rights calculated and the payment or instalment proposal made at the same time.

If the figures are wrong, use the correct dispute route. Start by requesting the administration’s calculation and the legal basis. Then send a reasoned claim identifying each disputed asset, liability, residence fact, treaty point, exchange rate and penalty. Attach the document that proves the correction. A generic complaint about “unfair French tax” will not replace a line-by-line calculation. If the administration rejects the claim or remains silent after the relevant period, the next procedure may be a formal tax claim and, where necessary, litigation before the competent court. The deadline must be checked against the type of tax notice and the date of payment or assessment.

Double taxation requires a second, separate schedule. HMRC’s France guidance in its Inheritance Tax Manual explains that the France–UK convention can require one state to waive tax on assets treated as situated in the other state, or can allow a credit where both systems tax the same assets. HMRC refers to evidence of French duty paid and to certificates used in the treaty process. The UK double-taxation relief guidance also warns that treaties with France have specific rules and should not be treated like a generic unilateral credit.

In practice, prepare a table with one row per asset: asset description, French situs, UK situs, French taxable amount, UK taxable amount, tax paid in each country, treaty provision relied upon, certificate requested and credit or exemption claimed. Submit the French return even if the treaty calculation is still being checked, but mark the claim and attach the evidence. A French form 2740 or another certificate may be required for foreign tax paid, depending on the exact facts and the current administration’s instructions. Do not deduct UK Inheritance Tax from the French return without documenting the legal basis and the amount actually paid.

The 2025 UK residence reform makes the date of death especially important. HMRC’s guidance says that the former domicile and deemed-domicile rules were replaced for the new regime from 6 April 2025, with long-term residence tests and transitional rules. An estate opened before that date may require a different UK analysis from one opened later. That difference can change the treaty schedule, but it does not remove the need to file the French return where French law applies. The French tax office will expect the British position to be explained, not merely asserted.

The most defensible regularisation package contains five parts: the corrected or late 2705-SD, a factual chronology, a calculation schedule, a legal memorandum identifying the French and UK rules, and a document index. The chronology should show when the family learned of the death, when the executor was appointed, when the French asset was identified, when the notary or tax service was contacted, when documents were requested, and why the final figure changed. This evidence can be relevant to the administration’s assessment of good faith and to any request concerning interest or penalties.

Before sending the package, check six failure points. First, is the deadline calculated from the death date and place rather than from the grant? Second, are all heirs and their foreign dates of birth documented? Third, are French and foreign assets reconciled without double counting? Fourth, are pounds converted to euros using a consistent, recorded method? Fifth, is the payment request filed with the declaration rather than months later? Sixth, does the treaty claim identify tax actually paid and the same asset in both countries? These checks are simple, but they prevent the omissions that usually create a second dispute.

If the estate includes French property in Paris or elsewhere in Île-de-France, the same principles apply, but the notary and the competent tax service must coordinate quickly because a title deed, an ownership certificate, a valuation and the tax return may be interdependent. The property itself is not the subject of this article; the point is that a delay in selling or transferring it does not automatically suspend the declaration. Where a co-heir blocks a sale needed to fund tax, obtain advice on the civil management of the indivision, meaning the joint ownership pending distribution, at the same time as the tax regularisation.

Conclusion

A British heir should treat French form 2705-SD as a separate legal and tax deadline, not as an appendix to UK probate. The key questions are the deceased’s and beneficiary’s tax residence, the location of the assets, the date and place of death, the France–UK treaty, and the evidence supporting every line of the return. The usual deadline is six months for a death in metropolitan France and one year in other cases, with a narrow twenty-four-month property rule that cannot be assumed without checking its conditions.

If the deadline has passed, filing a transparent late return with a chronology, provisional figures where necessary, a payment proposal and a correction plan is usually more useful than waiting for the British estate to become perfect. The French courts distinguish between a legal heir who must file despite a dispute and the rare procedural situation in which a genuinely contested universal legatee cannot yet file. Interest, statutory increases and double-taxation relief are separate issues and must be calculated separately. A British executor who acts quickly, keeps proof of delivery and links each argument to an official text gives the estate a realistic chance of reducing avoidable cost and resolving the French file without losing the UK treaty position.

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