How much tax could you pay when selling an investment in Belgium?
The Finorum Belgium Capital Gains Tax Calculator estimates the tax on gains from shares, bonds, ETFs, cryptocurrencies, real estate and other private assets. Enter the relevant acquisition value, sale value, applicable exemption and compatible losses to estimate the taxable gain, tax liability and amount remaining after tax.
Belgium introduced a new general tax on gains from financial assets from 1 January 2026. The standard rate is 10%, subject to an annual exemption. Different rules may apply to substantial shareholdings, speculative transactions, professional activity and Belgian real estate.
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How Belgium’s Capital Gains Tax Works in 2026
From 1 January 2026, individuals and non-profit organisations are generally subject to a 10% tax on realised gains from financial assets. The regime covers Belgian and foreign investments, including:
- listed and unlisted shares;
- bonds;
- ETFs and other investment funds;
- options and derivatives;
- investment and savings insurance products;
- foreign currencies and investment gold;
- cryptocurrencies.
Certain pension savings accounts, group insurance arrangements and qualifying long-term savings contracts are expressly excluded.
For a financial asset acquired from 2026 onward, the basic calculation is:
Capital gain = Sale value − Acquisition value
Under the new Belgian rules, transaction costs and taxes cannot be deducted when calculating the taxable financial gain. This is important when entering figures into the calculator: the purchase or reference value should reflect the tax basis permitted under Belgian law rather than a general accounting calculation that includes every expense.
The Belgian tax authority confirms that financial gains realised from 1 January 2026 are generally taxed at 10% and provides detailed guidance on the assets covered, exemptions and payment methods. Belgian Federal Public Service Finance
The €10,000 Annual Exemption
The first €10,000 of eligible realised financial gains per person is exempt for income year 2026, corresponding to assessment year 2027.
A limited part of an unused exemption can be carried forward. Up to €1,000 of unused exemption may be added for each following year, subject to the applicable conditions. After five years, the combined basic and accumulated exemption can reach a maximum of €15,000.
The exemption is personal. Where married or legally cohabiting partners file jointly, each partner is entitled to an exemption for the gains allocated to that person.
The calculator applies the standard annual allowance selected for the estimate. However, the available exemption may differ if it has already been used against another gain during the same year.
Investments Acquired Before 2026
Belgium’s new financial capital gains tax is designed not to tax gains accumulated before the regime began. For assets acquired before 1 January 2026, the value on 31 December 2025 generally serves as the reference value.
If the value on that date was higher than the original acquisition price, the reference value is normally used to calculate a later taxable gain. This means that only the increase arising from 2026 onward is brought into the standard calculation.
If the original acquisition price was higher than the value on 31 December 2025, the taxpayer may use that higher historical acquisition price. However, this cannot create a deductible historical loss. A negative result attributable to the period before 2026 is reduced to zero for the new regime.
Reliable evidence of the original price and the value at the reference date is therefore essential. Broker statements, official valuations and portfolio reports should be retained.
Shares, Bonds, ETFs and Funds
Standard realised gains from portfolio shares, bonds, trackers and other covered securities are generally taxed at 10% after the available annual exemption.
The 10% model is intended for ordinary financial investments. A different calculation may apply to substantial shareholdings, internal transfers or transactions that fall outside normal private investment activity. Gains connected with professional trading may instead be treated as professional income and taxed under the progressive income tax system.
Investment funds can also create other Belgian tax consequences that are separate from the new 10% capital gains tax. Depending on the fund’s structure and underlying investments, the Reynders tax or withholding tax on distributions may need to be considered. The calculator focuses on the selected disposal and does not reproduce every possible fund-level or distribution tax.
Belgian investors should also distinguish the capital gains tax from the stock exchange transaction tax and the annual tax on securities accounts. These are separate taxes and are not deducted from the financial capital gain under the standard formula.
Cryptocurrency Gains in Belgium
Cryptocurrencies are expressly included among the financial assets covered by the new 2026 capital gains tax. An ordinary private disposal can therefore fall within the standard 10% regime, after applying the available annual exemption.
The classification of crypto activity remains important. Occasional speculative income can be taxed separately as miscellaneous income, generally at 33%, while frequent and organised trading may be classified as professional income and taxed at progressive rates.
The distinction depends on the facts rather than on a single holding-period test. Relevant factors can include transaction frequency, use of borrowed money, the investor’s professional knowledge, trading organisation and the level of risk taken.
For this reason, the calculator provides alternative tax routes. The standard route should not be used where the activity is clearly speculative or professional.
Capital Gains on Belgian Real Estate
The new 10% financial-assets tax does not replace the existing rules for immovable property.
A gain from a privately held Belgian building may be taxable at 16.5% when the property is sold within five years of acquisition. A gain on undeveloped land may be taxable when the land is sold within eight years. The applicable rate is generally 33% when the land is sold within the first five years and 16.5% when sold after five but within eight years.
Different deadlines apply to property received as a gift and buildings constructed by the seller. A gain realised outside the normal management of private wealth may also receive a different treatment. Properties used for professional activity and transactions undertaken as part of a property business require a separate calculation.
A standard sale outside the relevant statutory period may be exempt, but the holding period alone does not resolve every case. The Belgian tax authority describes the five-year period for buildings, the eight-year period for land and the applicable 16.5% or 33% rates in its guidance on Belgian immovable property gains.
Losses and Payment of the Tax
Realised financial losses may be deducted from eligible gains under specified conditions. Historical losses arising before 2026 cannot be used to reduce gains under the new regime.
Belgium provides two payment routes. Under the opt-in system, a participating bank or broker withholds 10% when the gain is realised. Tax withheld on a gain covered by the annual exemption can later be reclaimed through the personal income tax return.
Under the opt-out system, no immediate withholding is made. The investor receives the gross proceeds and reports the taxable gain through the personal income tax return, while the financial institution provides the required information to the tax authority.
Example of a Belgian Share Sale
An investor purchases shares in February 2026 for €20,000 and sells them for €35,000 during the same year.
Realised gain: €35,000 − €20,000 = €15,000
Annual exemption: €10,000
Taxable gain: €5,000
Estimated tax at 10%: €500
Gain remaining after tax: €14,500
The example assumes that the investor has not used the annual exemption elsewhere and that the transaction falls within the standard private financial-assets regime.
Important Notice
The Belgium Capital Gains Tax Calculator provides an informational estimate for a Belgian tax resident holding assets privately. It does not fully cover substantial shareholdings, professional trading, every fund-specific tax, foreign tax credits, corporate investments, exit taxation or double-taxation treaties.
The final treatment depends on the asset, acquisition date, reference value, available exemption and nature of the investor’s activity. Seek advice from a Belgian tax professional for a substantial, speculative or otherwise complex transaction.
Belgium capital gains tax calculator
Matias Buće has a formal background in administrative law and more than ten years of experience studying global markets, forex trading, and personal finance. His legal training shapes his approach to investing — with a focus on regulation, structure, and risk management. At Finorum, he writes about a broad range of financial topics, from European ETFs to practical personal finance strategies for everyday investors.