Belgian capital gains tax: concise overview
Belgium has introduced a major reform of the taxation of capital gains on financial assets, fundamentally changing a long-standing feature of the Belgian tax system. Under the new rules, adopted by Parliament on 2 April 2026 and applicable retroactively as from 1 January 2026, capital gains on shares realized by Belgian resident individuals will no longer, as a working assumption, be tax exempt.
This reform represents a structural shift for private investors and business owners, requiring a reassessment of investment structures, exit strategies, and succession planning. While the reform targets gains realized within the scope of normal private wealth management, it introduces a layered system with differentiated tax treatments depending on the nature of the transaction.
Scope
The new capital gains tax applies to Belgian tax-resident individuals (and certain legal entities subject to the legal entities tax) and covers a wide spectrum of financial assets, including shares, bonds, certain insurance products, crypto-assets, currencies and investment gold.
Importantly, only gains realized outside a professional activity fall within scope. Transfers without consideration – such as gifts and inheritances – remain excluded. Non-residents are in principle outside the scope of the regime, although other provisions (e.g. exit tax) may still be relevant in a cross-border context.
Three-tier taxation framework
The reform introduces a three-category system for capital gains on shares, each with its own tax treatment:
Category 1: Internal capital gains: transactions whereby a taxpayer realizes a capital gain when selling shares to a company that one controls, are taxed at a flat rate of 33%, without any exemption.
Category 2: Substantial participations: this category applies to taxpayers who hold a substantial interest of at least 20% of the rights in the company whose shares are being transferred. They can benefit from a more favorable regime, combining exemptions and reduced rates. Depending on the circumstances, taxpayers may be subject to progressive rates or a 16.5% flat rate, always with a 1 million EUR exemption. In general, the following rates apply above the 1 million EUR exemption:
- Bracket between 1 million and 2.5 million EUR is taxed at a rate of 1.25%
- Bracket between 2.5 million and 5 million EUR is taxed at a rate of 2.5%.
- Bracket between 5 million and 10 million EUR is taxed at a rate of 5%.
- Amounts exceeding 10 million EUR are taxed at a rate of 10%.
In case of a transfer to an acquirer not located in a Member State of the European Economic Area, the capital gain will not be taxed according to the above progressive rates, but will be taxed at a separate flat rate of 16.5% (with a 1 million EUR exemption).
Category 3: Residual category: The residual category (applicable to all capital gains in scope which do not fall under category 1 or 2) is generally taxed at a 10% flat rate, with an annual exemption of 10,000 EUR (indexed annually).
Determination of the taxable basis
The taxable capital gain is calculated as the difference between the sale price and the acquisition value, determined on a gross basis (without deduction of costs).
A crucial feature of the regime is that only gains accrued as from 1 January 2026 are subject to taxation. Consequently, historical capital gains up to and including 31 December 2025 will not be subject to capital gains tax. As a result, the valuation of assets as of 31 December 2025 plays a central role.
For listed shares, market value at year-end 2025 applies, while unlisted shares require a valuation based on specific methodologies (e.g. arm’s length transactions, contractual formulas, equity plus EBITDA multiple 4, or valuation report prepared by a certified accountant or auditor before 31 December 2027).
This mechanism creates both opportunities and risks, particularly where historical acquisition values are difficult to substantiate or where valuations may be challenged.
Compliance and collection of capital gain tax
The reform introduces new compliance obligations, including reporting requirements in the personal income tax return and withholding tax (opt-out) mechanisms applied at source by financial intermediaries.
Emigration: Exit tax
An exit tax regime applies when individuals transfer their tax residence outside Belgium, triggering taxation of ‘unrealized gains’ as if the assets / investments were sold by the taxpayer. Deferral of payment and relief (no exit tax due) mechanisms may apply depending on relocation to EEA country or a country with which Belgium has concluded a double taxation treaty including an exchange of information and recovery assistance clause or a third non-treaty country.
Preparing for impact and navigating complexity
Given the breadth and technical complexity of the new regime, taxpayers should take proactive steps to assess its impact:
- Review existing shareholdings and structures to identify exposure under the different categories of capital gains.
- Assess the valuation position as of 31 December 2025, particularly for unlisted companies, and ensure appropriate (third-party valuation) documentation is in place.
- Revisit exit and succession planning strategies, including intergenerational transfers and holding structures.
- Monitor compliance obligations, including potential reporting and withholding tax implications.
At Panis, we excel in navigating this evolving landscape by combining technical expertise with a pragmatic, business-oriented approach:
- Impact assessments tailored to your specific shareholdings and structure
- Valuation support and coordination with independent accountants
- Transaction structuring and restructuring advice
- Assistance with compliance and reporting obligations
Capital Gains Tax can have different implications for every taxpayer, and it’s important to understand how these changes may impact your future plans. Book a consultation with one of our specialists or get in touch via our contact form for tailored advice and a better understanding of your options.
