Capital gains tax in Belgium

Belgium operated for decades without a general capital gains tax on private investors managing their own assets in the ordinary course. That structurally distinctive position ended when the Belgian Chamber of Representatives adopted a new capital gains regime on 2 April 2026, applying retroactively to gains realized from 1 January 2026 onwards. The change is the most significant shift in Belgian investment taxation in half a century.

What exactly does Belgium's new 2026 capital gains tax cover?

The law introduces a 10% flat tax on net capital gains from four categories of financial assets: (1) financial instruments, including listed and unlisted shares, bonds, ETFs, money market instruments, derivatives, and units in collective investment funds; (2) certain life insurance contracts with a savings or investment character (Branches 21, 22, 23, 26, and 44); (3) crypto-assets as defined under the EU MiCA Regulation and DAC8; and (4) currencies and investment gold. Pension savings, second-pillar group insurance, and third-pillar products qualifying for the tax-deduction regime under Article 145/8 of the Income Tax Code (ITC 92) are explicitly excluded. So are gains already taxable as professional income or as movable income (e.g., interest subject to withholding tax). Transfers on death and gifts are likewise outside scope. Real estate is not covered by this new law; pre-existing rules apply to property (see below).

The tax applies to Belgian resident individuals and to certain Belgian non-profit legal entities. Non-residents and Belgian companies subject to corporate income tax fall outside the scope of this specific regime.

Citations: PwC Belgium [1], EY Belgium [2], Fieldfisher Belgium [3].

What is the EUR 10,000 annual exemption and how does carry-forward work?

Each taxpayer benefits from an annual tax-free threshold of EUR 10,000 (indexed annually for inflation). Only net gains above that threshold in a given tax year are subject to the 10% rate. Capital losses realized in the same tax year can offset gains within the same asset category; unused losses cannot carry forward to later years.

A carry-forward mechanism supplements the basic exemption. In any year where your net gains remain below EUR 1,000, the unused slice of that first EUR 1,000 carries forward to future years. The carry-forward accumulates for up to five years, giving a maximum additional exempt buffer of EUR 5,000, raising the potential total annual exemption to EUR 15,000 in the best case. Married couples and legal cohabitants each hold their own exemption separately; the exemption is per taxpayer, not per household.

Citations: Banque de Luxembourg [4], Curvo [5].

How are pre-2026 gains treated -- what is the step-up mechanism?

Gains that accrued before 1 January 2026 are fully exempt from the new tax. The law achieves this through a mandatory valuation snapshot: for purposes of computing taxable gain, the acquisition value of any asset already held at 31 December 2025 is deemed to be the fair market value of that asset on 31 December 2025. For listed securities, this is the last closing price of 2025. For unlisted securities and other non-market-quoted assets, prescribed valuation methods apply.

There is one important exception in the taxpayer's favour: if you can demonstrate that your actual historical acquisition cost was higher than the 31 December 2025 fair market value (i.e., the position was underwater at year-end 2025), you may elect to use the higher historical cost instead. This election is available until 31 December 2030, giving taxpayers five years to gather and present documentation. After that deadline, the 31 December 2025 snapshot value becomes the irrevocable basis.

The practical effect: any appreciation in financial assets up to and including 31 December 2025 is locked out of Belgian tax, regardless of when the asset was purchased. Only post-2025 appreciation can be taxed under the new regime.

Citations: Loyens & Loeff [6], EY Belgium [2], Grant Thornton Belgium [7].

What rate applies to substantial participations of 20% or more?

A separate, more favourable regime applies when the capital gain arises from a "substantial participation" -- meaning the seller holds, directly or indirectly, at least 20% of the voting rights or share capital of a company. The threshold is 20%, not the 25% threshold that applied under the older Article 90(9) ITC 92 framework for non-EU disposals.

Under the substantial participation regime, the first EUR 1,000,000 of gain is exempt (this exemption is measured on a rolling five-year basis). Gains above that threshold are taxed on a progressive scale:

When the buyer is an entity situated outside the European Economic Area, a flat 16.5% rate applies to the entire gain on the substantial participation (without the EUR 1,000,000 exemption). Disposals of substantial participations to EEA-resident entities follow the progressive scale above.

Citations: Fieldfisher Belgium [3], Deloitte Legal Belgium [8].

How does the withholding mechanism work in practice?

For gains falling under the standard 10% regime on financial instruments and qualifying insurance contracts (not crypto, not currencies, not gold), Belgian financial intermediaries -- banks and licensed brokers -- are required to collect a 10% withholding tax at the point of each sale from 1 June 2026 onwards. The intermediary reports the gain and remits the tax to the FPS Finance on the taxpayer's behalf. Taxpayers can opt out of withholding and choose to self-report all gains in their annual tax return instead.

For crypto-assets, currencies, and investment gold, no automatic withholding applies -- taxpayers must self-report those gains in their personal income tax return. Gains from foreign brokers who are not Belgian intermediaries are also self-reported. The transition period from 1 January to 31 May 2026 was handled on a self-declaration basis because the formal law was not published until after the effective date.

SVG TIMELINE: Belgium CGT key dates

What were the pre-existing capital gains taxes that remain in force?

The 2026 law adds a new layer but does not eliminate Belgium's earlier CGT rules. Three regimes continue alongside the new 10% rate:

Speculative gains -- 33% as miscellaneous income (unchanged): Under Article 90(1)(1) of ITC 92, capital gains on any asset class realized outside the "normal management of private patrimony" remain taxable at 33% plus a communal surcharge (typically 6-8%). This facts-and-circumstances test looks at transaction frequency, use of leverage and derivatives, professional infrastructure, short holding periods, and whether trading is a primary income source. The burden of proof rests with the tax authority to show a gain is speculative. Buy-and-hold investors with periodic rebalancing are well within normal private management. Day-traders with automated systems and primary income from trading typically meet the speculative threshold. This 33% regime pre-dates the 2026 law and continues in parallel with it.

Internal transfers -- 33% flat rate (unchanged): Capital gains arising when an individual sells shares to an entity they control (or where close relatives control the buyer) are taxed at a flat 33% rate. This anti-abuse rule prevents taxpayers from extracting gains through related-party structures.

Real estate capital gains (unchanged): The 2026 financial-assets law does not touch immovable property. Pre-existing rules under Articles 90(1)(8) and 90(1)(10) of ITC 92 continue: gains on residential buildings sold within five years of acquisition are taxed at 16.5% plus communal surcharge; gains on building land sold within five years are taxed at 33% plus communal surcharge; land sold in years five through eight is taxed at 16.5%. Beyond these holding periods, private-patrimony real estate gains are tax-free. The principal residence is exempt regardless of holding period, provided the owner has occupied it continuously for at least twelve months.

Citations: PwC Tax Summaries Belgium [9], DLA Piper Real World [10].

For Belgian residents navigating multiple overlapping CGT rules -- including the new 10% regime, the 33% speculative rate, the substantial-participation progressive scale, and real-estate holding-period rules -- individual circumstances vary considerably. Consulting a qualified Belgian tax professional is the appropriate step before making decisions about asset disposals, emigration, or portfolio restructuring. A vetted Belgian tax professional can be found through the Belgium country overview.