Selling a French home does not end every tax question on the day the keys are handed over. Many British owners receive a taxe foncière notice months after completion and assume that the buyer must deal with it. That assumption confuses two different relationships. The French tax authority decides who is legally liable by looking at the ownership position on 1 January. The sale deed may then create a private reimbursement mechanism between seller and buyer for the period after completion. The first rule is public law; the second is a contract.

That distinction matters especially after Brexit. A British national living in the United Kingdom, a British national who has moved to France, and a French resident selling a second home are treated as owners for this French property-tax rule. Nationality does not transfer the tax notice to the buyer and does not, by itself, create an exemption. Your practical right to recover money will usually depend on the wording of the acte authentique, meaning the notarised sale deed, the date used by that deed, the last assessment notice and evidence of payment.

This guide separates the legal liability from the private calculation. It explains what to check, how to calculate a defensible share, how to make a demand in English or French-facing correspondence, and when a complaint to the French tax office is appropriate. It also explains why a tax complaint cannot replace a contractual claim against the buyer.

I. Who is legally liable for French taxe foncière after a sale?

A. Why the owner on 1 January receives and pays the whole bill

Taxe foncière is the annual French property tax charged on property in France. For a house or flat, the relevant category is generally the tax on built property. The starting rule is found in Article 1380 of the French General Tax Code (Code général des impôts, or CGI). The official text states: “La taxe foncière est établie annuellement sur les propriétés bâties sises en France à l’exception de celles qui en sont expressément exonérées par les dispositions du présent code.” In English, the tax is assessed annually on built property situated in France, subject to statutory exemptions. The provision is available on Légifrance, Article 1380 CGI.

The timing rule is decisive. Article 1415 CGI provides that the relevant property taxes “sont établies pour l’année entière d’après les faits existants au 1er janvier de l’année de l’imposition”. In other words, the assessment is made for the entire year on the facts existing on 1 January. See the current wording of Article 1415 CGI on Légifrance. If you owned the French property on 1 January, the French administration normally treats you as the redevable légal, the person legally liable for the tax, for that whole assessment year.

A sale on 10 February, 30 June or 20 December does not rewrite that public-law position. The tax notice can therefore arrive in the seller’s name after completion. The same applies if the property was empty, used only at weekends, occupied by the buyer immediately after completion or owned by a non-resident. Use and nationality are not the 1 January ownership test. The tax office is concerned with the legal facts used for the assessment, not with the private agreement that the parties made when they sold the property.

This is why an English-speaking owner should not send the notice back with a note saying that the house has been sold. A sale may require the land registry and tax records to be updated for later years, but it does not usually remove the seller’s legal liability for the year of sale. A letter to the tax office asking it to split the notice between the two owners is generally aimed at the wrong legal relationship. The administration’s answer may confirm that the seller remains liable while the deed’s private apportionment is left to the parties.

The official explanation is direct. The French tax administration’s sale-year property-tax answer says that the seller remains liable for the full year, while a private agreement can provide for a proportional reimbursement. The Service-Public explanation of property tax gives the same distinction and illustrates a sale during the year: the person who owned the property on 1 January pays the notice, then may seek the buyer’s contribution under the sale agreement.

Consider a British owner who completes a sale on 1 July. The 1 January owner may receive a notice for €1,800. The buyer does not become the tax authority’s debtor merely because the buyer owned and occupied the house for the second half of the year. If the deed says that the buyer reimburses the seller from the completion date to 31 December, the seller pays the €1,800 notice and then calculates the contractual share. If the deed is silent, the seller cannot assume that the tax office will create a reimbursement right.

There are several details that can alter the figure without altering the annual rule. The notice may contain local charges or a reduction that has to be allocated under the deed. The deed may use the date of the acte authentique, the date of entry into possession, or another date agreed by the parties. A buyer may have negotiated a credit in the completion statement instead of a later reimbursement. A sale that is rescinded or annulled raises a different question from an ordinary sale. These details should be read from the documents rather than reconstructed from the date on which you left France.

Do not confuse taxe foncière with French income tax, capital-gains tax or the tax on a second home. A British owner may have separate reporting obligations in France and the United Kingdom. The UK government’s guidance on foreign income and tax for UK residents is relevant to the UK side of a cross-border file, but it does not change who owes French property tax. A UK tax return, a non-resident status or a French tax-residence certificate cannot, without more, transfer the French notice to the buyer.

B. What a private prorata clause actually transfers

The private arrangement is usually described as a prorata temporis clause, meaning an apportionment according to time. It is often included in the acte authentique prepared by the notaire, the French civil-law notary who authenticates the deed and handles the completion funds. The clause may say that the buyer will bear taxes and charges from the date of completion, or that the buyer will reimburse the seller for the proportion running from the date of possession to 31 December. The precise words matter more than the label “tax adjustment”.

Article 1103 of the French Civil Code sets the contractual foundation: “Les contrats légalement formés tiennent lieu de loi à ceux qui les ont faits.” A contract that has been lawfully formed binds the parties as their law. Read the official text of Article 1103 of the Civil Code. A clearly drafted allocation can therefore give the seller a private claim even though the French administration still regards the seller as the annual taxpayer.

The wording may be short. In a decision dated 22 June 2017, the First Civil Chamber of the Cour de cassation examined a clause under which “il remboursera au vendeur le prorata d’impôts foncier calculé de ce jour au 31 décembre prochain”. The case is Cour de cassation, première chambre civile, 22 June 2017, no. 16-14.858. The decision is useful because it shows that a clause about reimbursement is treated as a contractual obligation; it is not necessary for the buyer to become the tax authority’s named taxpayer.

Earlier decisions point in the same direction. The Commercial Chamber considered a clear allocation of property-tax charges in Cour de cassation, chambre commerciale, 11 July 1995, no. 94-18.996. The First Civil Chamber addressed the effect of a sale clause in Cour de cassation, première chambre civile, 3 June 1997, no. 95-16.484. These authorities should not be read as a universal promise that every seller can recover a proportion. They support enforcement where the deed actually contains an obligation that can be identified and calculated.

A useful modern boundary appears in Cour de cassation, third civil chamber, 16 March 2023, no. 21-24.308. The decision states that “le paiement de la taxe foncière est la contrepartie de la propriété d’un bien et non de son usage”. The payment is the counterpart of ownership, not use. That sentence is a warning against arguments such as “the buyer lived there, so the buyer must legally pay the notice”. Use can help establish the period selected by a private clause, but it is not a substitute for the clause itself.

Look for expressions such as “à compter de ce jour”, meaning from this day; “entrée en jouissance”, meaning the date on which enjoyment or possession begins; “impôts et charges”, meaning taxes and charges; “prorata temporis”, meaning time-based apportionment; and “à première demande”, meaning payable on first demand. A clause might allocate only the annual property tax. Another might cover all owner charges, including a local waste-collection charge or a special assessment. Do not silently extend a narrow clause to unrelated amounts.

The date is equally important. If the deed says the buyer bears the tax from the date of the deed, use that date. If it says from entry into possession, check the possession provision. If the completion statement already credited the seller for a provisional amount, the later notice may require a balance rather than a second full claim. If the parties agreed that the buyer pays a fixed amount, the fixed amount may govern even if a simple day count would produce a different figure, unless the deed makes it an estimate subject to adjustment.

If there is no allocation clause, the legal position is less comfortable for the seller. The buyer’s later use of the property does not automatically create a statutory reimbursement claim. The parties may negotiate a settlement, and correspondence may reveal an additional agreement, but a demand based only on fairness can be disputed. The absence of a clause is especially significant where the notary’s completion statement contains no tax adjustment. Preserve the deed and the completion accounts before taking a position.

Brexit does not alter the interpretation of the clause. A British buyer and a British seller can still be bound by a French deed governed by French law. A seller living in England may need to send a formal demand across borders and receive euros into a UK account. That creates practical questions about bank charges, exchange rates and proof of receipt, but it does not turn a private prorata clause into a UK tax claim. A British owner should keep the French-language wording intact and explain it in an English schedule rather than replacing it with a loose translation.

II. How can a British owner recover the buyer’s share or challenge the bill?

A. How to calculate, prove and demand the contractual reimbursement

Start with the deed, not the tax notice. Make a document pack containing the signed acte authentique, any preliminary contract, the completion statement, the latest avis de taxe foncière (property-tax notice), proof that the notice was paid, the exact completion or possession date, the buyer’s contact details and every email in which the apportionment was discussed. If the documents are in French, create an English working translation while preserving the original wording. A bank statement showing a payment to the French tax authority is stronger than an unverified calculation copied into an email.

Then identify four numbers: the total amount covered by the clause, the date on which the buyer’s period starts, the date on which it ends, and the denominator used by the deed. The usual calendar-year calculation is:

Buyer’s contractual share = allocable annual amount × buyer’s allocated days ÷ days in the relevant year.

That formula is only a starting point. Some deeds use months, a 360-day convention, the date of completion as day one, or a fixed estimate prepared by the notary. If the deed gives a method, follow it. If it does not, state your method clearly and invite the buyer to identify a different contractual calculation rather than presenting an unexplained demand.

For example, suppose the notice is €1,800 and completion occurred on 1 July in a non-leap year. If the deed allocates the buyer’s share from 1 July through 31 December, the buyer’s period is 184 calendar days and the provisional share is €1,800 × 184 ÷ 365, or €907.40 when rounded to the nearest cent. If the deed uses 30 June as the transfer date, the result changes by one day. If the tax notice includes an amount that the deed excludes, remove it before applying the formula. The example is not a replacement for the wording of the deed; it shows why the date and inclusions must be written down.

The last notice may be the best available estimate when the sale completes before the new year’s notice is issued. Say that the amount is provisional if the deed requires a later adjustment. When the actual notice arrives, send a short reconciliation showing the notice total, the items included, the day count, the amount already credited at completion and the balance requested. This avoids a common dispute in which the buyer thinks the seller is asking for the same amount twice.

The demand should identify the contract before it states the amount. Give the page or paragraph of the deed, quote only the operative wording, state the completion date used, attach the notice and payment proof, provide the calculation, and give bank details that match the seller’s identity. If the buyer is in the United Kingdom, show the amount in euros and, if useful, provide an approximate sterling figure marked as indicative. The contractual debt remains a euro debt unless the deed says otherwise.

A clear first letter can be in English, but use the French names of the documents so that a French notary, lawyer or bailiff can identify them. A practical wording is: “I am requesting reimbursement under clause [number] of the deed signed on [date]. The clause allocates the taxe foncière from [date] to 31 December. The attached calculation produces €[amount]. Please transfer that amount to the attached account within 14 days, or explain in writing which contractual date or item you dispute.” Keep the tone factual. Do not say that the buyer is the person legally assessed if that is not true.

If the buyer does not pay, a formal mise en demeure may be appropriate. This means a legally significant demand putting the debtor in default. Article 1344 of the Civil Code states: “Le débiteur est mis en demeure de payer soit par une sommation ou un acte portant interpellation suffisante, soit, si le contrat le prévoit, par la seule exigibilité de l’obligation.” The official provision is at Article 1344 of the Civil Code. The way the demand is served matters, especially where a dispute may later need to be proved in France.

Article 1217 of the Civil Code lists remedies for non-performance, including the option to “poursuivre l’exécution forcée en nature de l’obligation”. See Article 1217 of the Civil Code. Depending on the deed, the amount and the evidence, a claim may seek payment, interest or damages caused by the failure to reimburse. A lawyer should check jurisdiction, service, limitation issues and the correct procedure before court proceedings begin. A British owner should not assume that an English small-claims route will be the right forum for a French property deed.

Proof becomes critical if the transaction has been unwound. In Cour de cassation, third civil chamber, 10 October 2019, no. 16-21.178, the court examined the consequences of an annulled sale and the evidence connected with amounts paid. The lesson for an ordinary reimbursement dispute is practical: keep the tax notice, proof of payment, deed and calculation together. If you cannot show that the amount was paid or that the clause covers it, a court may have nothing reliable on which to base the requested sum.

Before sending a final demand, check whether the notary’s office already holds funds or recorded a tax adjustment. Ask for the completion statement if your copy is incomplete. If the buyer paid a provisional amount directly to the notary, a new demand should be reduced accordingly. If the buyer sold the property again, send the demand to the person who signed your deed unless legal advice establishes a different liability. The later owner is not automatically a party to your original sale.

B. Which tax complaint, payment suspension or court route fits the dispute

Separate a wrong assessment from a correct assessment that has not been reimbursed. A wrong assessment is a dispute with the French tax administration: for example, the wrong property, a factual error, an exemption that was overlooked or an amount calculated incorrectly. A correct notice followed by a buyer’s refusal is normally a private contractual dispute. The tax office cannot order the buyer to perform a reimbursement clause, and the buyer cannot normally make the seller disappear from the annual assessment by pointing to the sale deed.

For a tax error, use the French réclamation, meaning a formal administrative claim. Article L190 of the Book of Tax Procedures (Livre des procédures fiscales, or LPF) begins its scope with “Les réclamations relatives aux impôts, contributions, droits, taxes, redevances, impositions de toute nature”. The official text is available at Article L190 LPF on Légifrance. Make the claim through the channel identified on the notice or through the taxpayer’s secure online account where available. State the property reference, tax year, contested amount, legal or factual error and requested relief. Attach the deed only if it proves a point relevant to the assessment; a private prorata clause alone does not make the tax notice wrong.

Deadlines must be checked against the tax year and the type of claim. Article R*196-2 LPF sets a time framework for direct-tax claims, generally requiring a claim by 31 December of the following year in situations based on the notice or role, subject to the rule applicable to the event and the particular tax. Read the current text of Article R*196-2 LPF and the notice itself. Do not wait for negotiations with the buyer if a statutory tax-claim deadline is approaching. A tax complaint and a private reimbursement demand can proceed in parallel because they address different defendants and different legal questions.

Filing a complaint does not necessarily suspend collection. If you dispute the basis or amount of an assessment, Article L277 LPF allows the taxpayer, subject to its conditions, to request a sursis de paiement, meaning suspension of payment of the contested amount. The provision says that the taxpayer “peut demander à surseoir au paiement de la partie contestée”. See Article L277 LPF. The request should identify the contested amount and grounds; the administration may seek guarantees. Do not simply withhold payment because a complaint has been filed.

Late payment has its own consequences. Article 1730 CGI provides for a 10 per cent increase in the cases covered by that provision. The current text is available at Article 1730 CGI on Légifrance. A British owner who is unsure whether to pay while challenging an assessment should obtain advice quickly, because an unsuccessful suspension request or an incomplete claim can leave the original payment deadline intact. Paying the tax to protect the public-law position does not waive a properly documented private claim against the buyer.

Some relief rules are separate again. For instance, a temporary vacancy or a statutory reduction may have its own conditions under the CGI; it should not be confused with the sale-year apportionment. A buyer’s occupation after completion does not automatically produce a vacancy reduction for the seller, and a sale clause does not automatically create a tax exemption. The correct request depends on the factual event, the dates and the legal provision relied on.

When the dispute concerns only the buyer’s refusal, send the contractual demand and, if needed, a formal mise en demeure. Give the buyer a reasonable deadline, preserve delivery evidence and keep the calculation stable. If the buyer replies that the tax notice is “in the seller’s name”, answer by distinguishing legal liability from reimbursement: the seller paid because the law names the 1 January owner, and the buyer is asked to perform the separate obligation in the deed. If the buyer disputes the calculation, request the exact clause and alternative calculation rather than debating nationality or occupation.

Do not rely on a court decision without checking its facts. The cases cited above concern particular wording, documents and procedural histories. The result may differ if the deed contains no prorata clause, if the parties agreed a fixed completion adjustment, if the sale was cancelled, or if the requested sum includes charges outside the clause. The relevant question is not whether a British seller feels that a share is fair; it is whether an enforceable obligation, a defensible amount and evidence of performance can be shown.

For a British owner living outside France, an orderly file also reduces cross-border friction. Keep a copy of the notice, deed and letters in a single PDF folder, retain the original French documents, record the date and method of service, and ask the bank for a payment confirmation showing the beneficiary and reference. If a translation is used in negotiations, mark it as a working translation. If proceedings become likely, obtain a professional translation or advice on the evidence required by the relevant French court. Exchange-rate losses, bank fees and tax treatment in the UK should be addressed separately from the French reimbursement calculation.

Finally, remember that French property tax is not the whole tax profile of a sale. A British resident may need separate advice about French capital gains, UK reporting, the France–UK double-taxation rules and the treatment of rental or investment income. HMRC’s guidance on relief where income is taxed twice explains the UK-side concept, but it cannot decide the private allocation of a French taxe foncière notice. Keep the questions separate so that a correct answer in one system is not used as evidence in the wrong dispute.

Conclusion

A British owner who sells French property during the year will normally remain the French taxe foncière taxpayer if they owned the property on 1 January. That is the public-law rule. The buyer’s contribution is a different matter: it normally comes from a clear clause in the sale deed, using the date and calculation method that the parties accepted. The buyer’s occupation, British nationality or later receipt of the keys does not by itself change the tax office’s assessment.

The safest route is document-led. Read the deed, identify the operative clause, confirm the date, separate included and excluded items, calculate the share transparently, attach the notice and proof of payment, and make a written demand. Use a French tax complaint only where the assessment itself is wrong, and consider a payment-suspension request rather than withholding tax informally. If the buyer refuses a contractual reimbursement, the dispute belongs in the contractual enforcement process, not in an attempt to make the tax office rewrite the annual notice.

Because a sale deed, tax deadline and cross-border service issue can interact, obtain advice before a deadline expires or a final demand is sent. A short review of the deed and completion statement can often show whether the claim is a straightforward balance, a tax correction, a negotiation or a matter requiring formal proceedings.

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For a rapid review of your French property-tax dispute, call +33 6 46 60 58 22 (Maître Reda Kohen) or use the contact page.