France-Belgium Tax Treaty: Tax Residence and Cross-Border Income

France-Belgium Tax Treaty of March 10, 1964: Tax Residence, Cross-Border Workers, and Income Taxation

The tax treaty between France and Belgium, signed on March 10, 1964 and substantially amended by the protocol of December 12, 2008, constitutes the legal foundation governing the allocation of taxing rights between the two States concerning income and wealth taxes. This treaty, whose continuous application extends to all natural and legal persons resident in one or both contracting States, determines the obligations and taxable income calculations in cross-border situations affecting millions of taxpayers: cross-border workers in northern, eastern and central regions, expatriates residing in Belgium, entrepreneurs with business activities across the frontier. The interaction between these treaty provisions and the domestic rules of each State, as codified in articles 4 B, 197 A, and 210 of the French Tax Code (CGI), requires nuanced understanding of tax residency criteria and double taxation elimination mechanisms, as failure to do so exposes taxpayers to substantial risks of cumulative adjustments or loss of tax credits.

Treaty Architecture: Allocation of Taxing Rights and Hierarchical Order

Signed on March 10, 1964, the France-Belgium treaty follows the OECD model of the 1960s, adopting its cardinal principles: limitation of withholding taxes, preferential allocation of taxing rights to the State of residence (rather than the source State), and bilateral double taxation elimination mechanisms. It should be noted that the treaty has undergone three major protocols, each marking a significant shift in the applicable regime: the protocol of February 15, 1971 (general revision aligning the text with international tax law developments), the protocol of February 8, 1999 (technical corrections), and critically, the protocol of December 12, 2008 (elimination of the cross-border worker regime for Belgian residents working in France, with retroactive effect to January 1, 2007). This does not mean the entire cross-border worker regime has disappeared: it subsists for French nationals residing in France and working in Belgium, but under stringent conditions and for a limited period until December 31, 2033.

It should be noted that the two contracting States signed a new convention on November 9, 2021 in Brussels, which remains pending ratification through the internal procedures of both States. This new convention, unlike the 1964 instrument, is designed to modernize the treaty framework and adapt provisions concerning the prevention of abuse of rights, combating tax fraud, and integrating OECD BEPS recommendations into the France-Belgium treaty corpus. Provisionally, the 1964 convention remains the instrument governing fiscal relations between the two States as of 2026, notwithstanding the lack of ratification of the new convention.

The treaty takes hierarchical priority over French domestic law by virtue of article 55 of the French Constitution, which grants international treaties primacy over domestic legislation, as applied and confirmed by the Conseil d'État (CE Ass., 20 October 1989, Nicolo, n° 108243). Article 165 bis CGI draws the procedural consequences of this primacy, providing that income allocated to France by a convention remains subject to French income tax, notwithstanding any conflicting domestic provision. Thus, in case of conflict between a treaty provision and French law, the treaty invariably prevails—a principle of constant importance in disputes involving residual double taxation or incorrect withholding tax application.

Tax Residence: Tie-Breaker Criteria and Case Law Application

Article 1 (or article 4, depending on versions) of the treaty sets forth tax residence criteria applicable when a natural person is deemed resident of both States under their respective domestic law. The treaty then applies a tie-breaker mechanism based on successive criteria: first, the permanent home available, meaning the dwelling where the taxpayer habitually resides with family or dependents and maintains regular and permanent connections to daily life. It should be noted that this criterion rests on a substantive notion of permanence rather than mere property ownership or calendar days of residence: a French resident owning a secondary residence in Belgium but whose principal home (furnished, permanently occupied, center of family life) is situated in France remains a French resident for treaty purposes, irrespective of days spent in Belgium.

Absent resolution by this first criterion, the treaty examines the center of vital interests, a concept encompassing the totality of personal and economic circumstances: the seat of principal professional activity, family situation, location of immovable and movable property, cultural, sporting and social relationships maintained in the State of residence. Consistent French Supreme Administrative Court (Conseil d'État) jurisprudence has clarified that the center of vital interests is assessed globally, considering all objective connections: a French executive working in Belgium but whose family resides in France and who maintains professional and financial ties in France generally retains the center of vital interests in France even if physically exercising activity in Belgium.

Absent clarity, the criterion of habitual residence applies: this means the number of days habitually spent in each State, without requiring continuous or uninterrupted residence. Finally, as a last resort, the nationality of the taxpayer determines the tie-breaker. This final resource operates only when all preceding criteria remain indecisive, which occurs rarely in practice.

Cross-Border Workers: French Residual Regime Approaching Extinction (2007-2033)

The protocol of December 12, 2008, effective January 1, 2009, effected a radical transformation of the cross-border worker regime requiring precise description to avoid declaration errors. For Belgian residents working in France, the historical cross-border regime—which permitted taxation of salaries in Belgium (State of residence) rather than France (State of employment)—was abolished with retroactive effect to January 1, 2007. Moreover, no transition period or grandfathering was granted: from January 1, 2007 onward, every Belgian resident working in France sees their salaries subject to standard French taxation, with article 11 of the treaty allocating taxing rights over private employment income to the State of employment, subject to the specific treaty conditions. This retroactive abolition resulted in significant tax adjustments for affected Belgian cross-border workers for years 2007-2008, prior to the protocol's enactment.

For French residents working in Belgium, the situation differs substantially and proves more favorable: the cross-border regime has been maintained under draconian conditions, with the transitional regime remaining applicable for remuneration received up to 31 December 2033 for taxpayers meeting the requisite conditions, in accordance with the administrative doctrine (BOFiP). A French employee residing in France and working in Belgium may retain taxation of salaries in France (rather than Belgium) if three cumulative conditions are satisfied: (1) they were already a cross-border worker benefiting from the cross-border worker regime on December 31, 2011 (grandfathering condition: no new cross-border worker, except specific cases such as seasonal workers, may access the regime from January 1, 2012); (2) they exercise activity in the Belgian border zone and do not absent themselves more than thirty days per calendar year (this strict limit applies calendrically, January 1 through December 31, and any excess results in retroactive loss of regime benefits for the entire year); (3) they return to France at least weekly, implying regular and continuous connections to French territory. This condition must be interpreted strictly: absences or substantial modifications in return frequency may justify reconsidering cross-border worker status.

The Belgian border zone must be analysed under the treaty and administrative definition, which is based on an approximately twenty-kilometre border strip on each side of the common frontier, together with the administrative list of municipalities concerned. It should therefore be described by reference to that border zone and to the administrative list of municipalities concerned. Working outside that zone, even temporarily beyond the permitted tolerance, may jeopardise the benefit of the regime.

Tax Residence of Directors and Administrators of Belgian Corporations

Directors of Belgian corporations (managers of limited liability companies, administrators, chief executives) who reside in France and work in Belgium do not benefit from a derogatory regime regarding their compensation or directors' fees. Compensation received for management functions must be characterized precisely under the applicable treaty provisions, depending on the exact nature of the functions performed. Directors' fees received by board members fall within the general regime for foreign-source income and must be declared in France in form 2047 (income received abroad). Double-taxation relief is governed by Article 19 of the treaty, and its operation varies according to the type of income and the direction of the payment. It should be noted that Belgian tax on such compensation may be substantially higher than French tax, particularly regarding decentralized Belgian regional and municipal taxes, justifying advance planning.

Dividend Taxation: Reduced Withholding Taxes and Eligibility Conditions

Article 15 of the treaty addresses the taxation of dividends paid by a corporation resident of one contracting State to a resident of the other State. Dividends are generally taxable in the State of residence of the beneficiary, subject to withholding tax by the source State. The convention provides for reduced withholding rates on dividends under specific conditions related to the level of participation and beneficial ownership status. The applicable rates and conditions should be verified against the current treaty text and administrative commentary, particularly regarding the conditions for reduced or zero-rate treatment. Beneficial owner status and applicable withholding thresholds require careful analysis, and proof of beneficial owner status through tax residence certificates and substantiation is essential to claim any reduced rates.

Interest and Royalty Taxation: Capped Withholding Taxes

Article 16 of the treaty governs interest, meaning all income from receivables of any kind, including income treated as interest per each State's tax qualification (securities account interest, fixed-income investment returns, inter-company loan interest). Interest paid from one contracting State to a resident of the other is taxable in the State of residence of the beneficiary. The source State nevertheless retains the right to levy withholding tax, but the rate may not exceed 15% of the gross interest amount. This 15% treaty cap must be distinguished from the double-taxation relief mechanisms provided by Article 19 of the treaty.

Nevertheless, partial and targeted exemptions apply: interest paid by a State, its local authorities, central bank or official monetary institution of the source State escapes withholding (0% rate). Similarly, interest paid by approved credit institutions or financial institutions domiciled in a contracting State benefits from exemption, provided the lender and borrower are not related persons (excluding inter-company loans generally). This latter reserve is determinative: a loan advanced by a French bank to a Belgian subsidiary of a common parent corporation may not qualify for exemption if the entities are deemed related.

Article 8 of the treaty addresses royalties, meaning payments for use or permission to use patents, trademarks, designs, processes, formulas, information regarding industrial, commercial or scientific experience, cinematographic films or television recordings, or technical assistance. Royalties paid from one State to another are taxable in the State of residence of the beneficiary. The source State may levy a withholding tax limited to 5% of gross amounts, a particularly favorable rate reflecting the less tangible nature of the income involved. However, technical assistance royalties are strictly qualified and benefit from the reduced rate only if satisfying formal conditions established by the treaty and clarified in French administrative jurisprudence. Absence of substance in the assistance (provision of simple services or generic advice) may justify requalification and application of a higher rate or different taxation rules.

Distinction Between Public and Private Pensions: Differentiated Taxation

Article 10 of the treaty operates a fundamental distinction between public and private pensions, whose consequences for tax residence remain decisive for French retirees contemplating expatriation to Belgium or vice versa. Public pensions—meaning allowances paid by a State, public authority, international organization or public law institution in compensation for services rendered—are taxable exclusively in the State paying them, regardless of the recipient's current tax residence. This rule means a French retiree receiving a pension paid by the French State or French authority (notably a civil service pension) remains subject to French taxation on that pension even if they have transferred tax residence to Belgium after retirement. This taxation persists indefinitely, requiring the taxpayer to annually declare the French pension on the French tax return, while also declaring it—as information only—in Belgium if the latter exercises jurisdiction based on residence.

Conversely, private pensions—paid by a supplementary retirement plan, private pension fund, insurer or privately constituted pension fund without public-institution character—are taxable only in the State of residence of the beneficiary under Article 12 of the treaty. Thus, a French employee who contributed to a French supplementary pension plan, such as AGIRC-ARRCO, and expatriates to Belgium must analyse that pension under Belgian resident tax law. This should not be presented as a general French tax-credit mechanism: Article 19 governs double-taxation relief according to the income category and to the taxing right allocated by the treaty.

This distinction carries major importance for Belgium expatriates. A complete tax audit prior to residence transfer, addressing separation between public and private pensions, each amount, and implications for French, Belgian and tax credit purposes, remains essential to avoid adjustments and residual double taxation.

Real Property and Securities Gains: Taxation per Source

Article 3 of the treaty allocates taxing rights over income from immovable property—all income from immovable property situated in a contracting State—to the State of property location, irrespective of the owner's residence. A Belgian resident owning rental real estate situated in France is therefore taxable in France on real estate income under the regime applicable to non-residents. Depending on the applicable conditions, the French tax treatment may fall under the micro-foncier regime or the actual-expense regime; the minimum tax rate under article 197 A of the CGI must also be checked for non-residents. Real estate income qualification as French-source income is strict and leaves little discretion.

Real property sale gains also fall within the source State's taxing rights. Thus, a Belgian resident selling French immovable property is taxable in France under article 244 bis A of the CGI and articles 150 U et seq. of the CGI. The principal residence exemption is based on article 150 U, II-1° and requires the property to be the seller's actual principal residence on the sale date. For a taxpayer who has become non-resident, the specific non-resident exemption under article 150 U, II-2° must be examined, including prior French residence, timing, free disposal of the property and the EUR 150,000 cap on the exempt net taxable gain.

For securities gains (sale of shares, corporate units or debt securities), the 1964 France-Belgium treaty does not contain a standalone general capital gains article comparable to the OECD model. Where no special treaty provision applies, article 18, the residual clause, generally leads to taxation in the seller's State of residence. This analysis must nevertheless be checked against French domestic law, article 244 bis B of the CGI, real-estate-rich company situations and the new France-Belgium treaty once it actually enters into force. Any significant Franco-Belgian securities disposal therefore requires a specific treaty and domestic-law review.

France-Belgium Successions: A Specific Treaty Separate from the Income-Tax Treaty

The France-Belgium income-tax treaty of 10 March 1964 must be distinguished from the France-Belgium convention of 20 January 1959 concerning inheritance taxes and registration duties. The income-tax treaty does not itself govern inheritance tax; however, France-Belgium successions should not be described as having no treaty framework at all. They must be analysed under the specific inheritance-tax and registration-duty convention, together with the deceased's domicile, the location and nature of the assets transferred and, where relevant, French domestic rules under Article 750 ter CGI.

Unilateral imputation mechanisms—permitting one jurisdiction to grant a credit or reduction for tax imposed by the other State—remain limited and do not cover all situations. Complex France-Belgium successions thus require advance planning before death and detailed analysis of attachment criteria in each State. In particular, identify the precise date of tax residence transfer, resident status in France, Belgium or as non-resident, and property situation on death (French or Belgian immovables, French or Belgian securities, bank accounts in each country), and succession taxes applicable in each jurisdiction. This complexity justifies engaging an international tax lawyer specialized in succession law and cross-border estate planning.

Conclusion

The France-Belgium treaty, despite its age and partial revisions by protocols, remains a fundamental legal instrument for residents of both States. Determining tax residence, the specific but expiring cross-border worker regime for French nationals working in Belgium, qualification and taxation of different income categories (salaries, dividends, interest, royalties, pensions), and the need to distinguish the France-Belgium income-tax treaty from the specific France-Belgium convention of 20 January 1959 concerning inheritance taxes and registration duties all constitute vigilance points requiring specialized expertise. For these reasons, we recommend all France-Belgium taxpayers and cross-border workers conduct a preliminary tax audit before residence change or major estate transaction, to anticipate tax consequences and implement optimal structuring. Our international tax law firm is available to analyze your cross-border situation and define an optimization strategy compliant with treaties and French domestic law.