Belgium Cross-Border Tax Guide

Residence and Source Taxation

• Resident vs non-resident: An individual is a Belgian tax resident if they have their domicile (domicile / woonplaats) or centre of vital economic interests (centrum van economische belangen / centre des intérêts économiques) in Belgium. A company is resident if it has its registered office (statutaire zetel / siège social) or effective management (werkelijke leiding / direction effective) in Belgium. Residents are taxed on worldwide income. Non-residents are taxed only on Belgian-source income (real estate in Belgium, Belgian employment income, Belgian business income through a PE, Belgian directors' fees, and certain passive income from Belgian sources).
• Treaty tie-breaker: Where an individual is resident in two countries under domestic law, the tax treaty tie-breaker rules determine residence: (a) permanent home, (b) centre of vital interests, (c) habitual abode, (d) nationality. The mutual agreement procedure (MAP) under the treaty is available if the tie-breaker does not resolve the issue.
• 183-day rule (employment income): Under most Belgian treaties, employment income is taxable only in the country of residence if the employee is present in the source country for ≤183 days in any 12-month period and the remuneration is paid by a non-resident employer. If the threshold is exceeded, the income is taxable in both countries (with a foreign tax credit in the residence country). This is the standard OECD model treaty rule (art. 15).

Expat Tax Regime (Special Tax Status for Foreign Executives)

• The regime (now restricted): Belgium historically offered a highly favourable expat tax regime (the "bijzondere belastingregeling voor buitenlandse kaderleden" / "régime fiscal des cadres étrangers") that exempted up to 50% of qualifying executive remuneration from Belgian tax (the "cost-free allowance" / "kosten-vrij-vergoeding"). The exemption was available to executives and specialists recruited abroad who were temporarily assigned to Belgium. The regime was significantly tightened from 1 January 2022.
• Current rules (post-2022 reform): The maximum exemption is now 30% of qualifying remuneration (reduced from 50%). The exemption is capped at €90,000 of tax-free allowance (the 30% of qualifying salary cannot exceed €90,000 in exempt amount — meaning the maximum exempt income is capped at €90,000, not 30% of actual salary if that would exceed this cap). The "non-resident" regime (partial non-resident status) is abolished — expats are now treated as ordinary residents for filing purposes.
• Qualification: To qualify, the executive must: (a) be recruited abroad (recruited outside Belgium specifically for the Belgian assignment), (b) have specialised knowledge or managerial responsibility, (c) not have been a Belgian resident in the 5 years prior to the assignment (10 years for certain cases), (d) be employed by a qualifying Belgian entity (or a foreign group with a Belgian branch), (e) the assignment must have a defined duration (temporary secondment — not a permanent relocation). The regime is typically granted for a maximum of 5 years (extendable to 8 years in certain cases).
• Application: The employer must apply for the regime to the Service des Décisions Anticipées (SDA / Dienst Voorafgaande Beslissingen — DVB) — Belgium's tax ruling service. The application must be made before the start of the assignment (or within 3 months of arrival). The ruling is valid for the full duration of the assignment but is subject to annual review.

Partial Foreign Tax Credit (PFT / PFB)

• Mechanism: Where Belgian tax treaties allocate taxing rights to both source and residence country (e.g., dividends, interest, royalties, certain employment income), Belgium grants a Partial Foreign Tax Credit (PFT / PFB — "Pseudo-Forfaitaire Belasting" / "Quotité Forfaitaire d'Impôt Étranger"). The PFT is a lump-sum credit calculated as a percentage of the foreign gross income: 50% of the gross foreign interest, royalty, or management fee income, or 74% of gross foreign dividend income. The credit cannot exceed the Belgian tax on the same income.
• Application: The taxpayer reports the gross foreign income on the Belgian tax return and applies the PFT. The credit reduces Belgian tax dollar-for-dollar up to the limit. Any excess credit cannot be carried forward or refunded. The PFT is available to both individuals and companies, but the calculation differs slightly for companies (the PFT is applied at the corporate level).
• Alternative: ordinary foreign tax credit (OFTC): For certain types of income not covered by the PFT (e.g., foreign employment income, foreign business profits, foreign real estate income), the taxpayer can claim the ordinary foreign tax credit (OFTC / gewoon belastingkrediet) for the actual foreign tax paid (up to the Belgian tax on the same income). The OFTC requires proof of foreign tax paid (tax assessment or certificate).

Exit Tax (10-Year Rule)

• Emigration of individuals: When an individual moves their tax residence out of Belgium, the exit tax applies to certain deemed realisations. Specifically: (a) substantial shareholding (aanmerkelijk belang / participation importante): if the individual (alone or with family) held ≥25% of shares in a Belgian company, a deemed capital gain is triggered on the inherent gain of those shares. The gain is taxed at 16.5% plus municipal surcharge (effective ~17.5%). (b) The tax is assessed on the difference between the fair market value at the date of emigration and the tax cost basis.
• The 10-year rule: If the individual cannot pay the exit tax at the time of emigration, they may request a 10-year deferral. Under the deferral: (a) the gain is held in a suspense account; (b) income on the suspended gain (e.g., dividends) is still taxable in Belgium; (c) if the shares are actually sold within 10 years, the exit tax becomes due immediately; (d) after 10 years, the exit tax is waived. The deferral requires that the individual file an annual return (a "nihil" return) for the 10-year period.
• Corporate exit tax: When a company moves its registered office or effective management out of Belgium, a corporate exit tax applies to: (a) deemed realisation of all assets (at fair market value), (b) deemed dissolution of the company's tax reserves. The exit tax is 25% on the deemed gain. Deferral is not available for corporate emigration — the tax is due immediately.

Cross-Border Workers (Grenswerkers / Frontaliers)

• Definition: Cross-border workers (grenswerkers / travailleurs frontaliers) are individuals who reside in one country and work in a neighbouring country, returning home at least once a week. Belgium has special treaty provisions with its four neighbouring countries: France, Germany, Luxembourg, and the Netherlands.
• Treaty rules (French/German/Dutch borders): Under the France-Belgium, Germany-Belgium, and Netherlands-Belgium treaties (and the Benelux Treaty), cross-border workers are allocated as follows: (a) the country of residence has the primary taxing right on employment income, NOT the country where the work is performed (this is an exception to the general 183-day / work-location rule). (b) The employer must still withhold social security in the work country (if the worker is affiliated there). (c) A compensation mechanism between the two tax authorities may apply (the "employer country" pays a lump-sum compensation to the "residence country").
• Luxembourg special regime: Under the Luxembourg-Belgium treaty, cross-border workers who live within a 30km zone of the Luxembourg border are subject to a special regime: (a) employment income is taxed in the country where the work is performed (Luxembourg — not the residence country), (b) the worker files a tax return in Luxembourg (not Belgium), (c) the Belgian residence is maintained for social security and indirect tax purposes. This is unique — the standard rule for French/German/Dutch borders is reversed for the Luxembourg border.
• Home office impact (post-COVID): The COVID-19 pandemic led to temporary bilateral agreements allowing home office days to be treated as if worked in the employer's country. As of 2026, permanent rules have been implemented under most treaties: (a) home office up to 20–30% of days does not shift taxing rights; (b) beyond that threshold, the income is split between the residence country (for home office days) and the work country (for office days). Employers must track home office days carefully for cross-border workers.

EU Directives and GAAR

• Parent-Subsidiary Directive: Dividend payments from a qualifying EU subsidiary to a Belgian parent (or vice versa) are exempt from withholding tax if: (a) the parent holds ≥10% of the subsidiary's capital, (b) the holding period is ≥12 months (continuous). The directive applies to all EU Member States (and EEA countries that have implemented it).
• Interest & Royalties Directive: Interest and royalty payments between associated companies in different EU Member States are exempt from withholding tax if: (a) the recipient holds ≥25% of the payer's capital, (b) the holding period is ≥12 months, (c) both companies are subject to corporate tax. The directive applies to the minimum 25% threshold — Belgium's domestic law may apply lower thresholds (10% for certain cases).
• Merger Directive: Cross-border mergers, demergers, asset contributions, and share exchanges within the EU can be carried out tax-free under the Merger Directive. The directive applies to Belgium under domestic implementation (art. 211 WIB/Venn.Cod.). An advance ruling from the SDA/DVB is strongly recommended to confirm the tax-free treatment.
• DAC6 mandatory disclosure: Belgium has implemented DAC6 (the EU mandatory disclosure regime for cross-border arrangements). Intermediaries (advisers, accountants, lawyers) must report any "reportable cross-border arrangement" that meets certain hallmarks (e.g., confidentiality, standardised documentation, conversion of income into capital, use of loss companies, transfer pricing, preferential regimes) within 30 days of the arrangement being made available to the taxpayer. Failure to report carries penalties of up to €25,000.
• MLI status: Belgium has ratified the Multilateral Instrument (MLI) to implement BEPS treaty-related measures. The MLI modifies Belgium's covered tax treaties (the list is published by the OECD). Key MLI provisions: principal purpose test (PPT), minimum standard for dispute resolution (MAP), and anti-abuse rules for treaty shopping. The MLI has been in effect for Belgium since 1 October 2019 for most treaties.

Permanent Establishment (PE) and Services

• Definition: Under Belgian domestic law and treaty law, a PE is defined as a fixed place of business through which a non-resident company carries on business (OECD Model Art. 5). This includes: a place of management, branch, office, factory, workshop, mine, oil or gas well, quarry, and construction site exceeding 12 months. The domestic definition (WIB 92 art. 229) is broader than the treaty definition — domestic law may find a PE where the treaty does not.
• Service PE: Under the MLI (and many recent treaties), a service PE arises where an enterprise provides services (including consultancy) in Belgium through individuals present for >183 days in any 12-month period. The UN Model includes a service PE provision; Belgium's treaty practice varies.
• Commissionaire PE: Belgium implements the OECD's 2017 PE definition changes, including the anti-fragmentation rule (preventing the splitting of activities to avoid PE). An agency PE arises where a person habitually concludes contracts in Belgium on behalf of a foreign enterprise.

For related reading, see our Corporate Tax Guide →, Personal Tax Guide →, Hiring Employees Guide →, and VAT/BTW Guide →.