Short summary
Belgium’s new capital gains tax (CGT) does not change the existing tax treatment of Employee Stock Options: qualifying options remain taxable at grant, and non-qualifying options at exercise. The CGT applies only to subsequent gains, avoiding double taxation. Accordingly, the timing of exercise and disposal becomes key to avoid unnecessary tax exposure.
Special tax regime
Belgium’s new capital gains tax (CGT), introduced this year, does not fundamentally alter the taxation of Employee Stock Options. In Belgium, these instruments continue to fall under a distinct and well-established regime, namely the Law of 26 March 1999. Under that framework, (Qualifying) Stock Options granted within the employment relationship are generally taxed at the moment of grant, provided they are accepted within the statutory 60-day period. The taxable benefit is determined on a rather favourable lump-sum basis and taxed as professional income at progressive rates. Non-Qualifying Stock Options, on the other hand, are typically taxed at the moment of exercise on the actual benefit realised.
Currently, the legislator has explicitly clarified that it is not the intention to tax the underlying economic benefit – such as the price reduction or embedded upside – once again under the new CGT. This avoids overlap between employment income taxation and capital gains taxation.
While the legislative history initially suggested that stock options under the Law of 1999 would fall completely outside the new CGT, this broad exclusion was ultimately replaced by a more limited regime allowing taxation of post-exercise gains.
No taxation at exercise
The exercise of stock options does not, in itself, trigger taxation under the new CGT. This is consistent with the existing framework, where the taxable moment is typically situated at grant rather than at exercise. The system is designed to ensure that the value already taxed as employment income is not taxed again at a later stage.
Sale of shares acquired via exercise
When shares obtained through the exercise of stock options are subsequently sold, CGT may become relevant. In that case, the acquisition value is deemed to be the market value of the shares at the moment of exercise. This mechanism ensures that only the post-exercise appreciation is taken into account.
For example, if an option with a strike price of €100 is exercised at a time when the share is worth €230, and the share is later sold for €260, the taxable gain is limited to €30. The difference between the strike price and the value at exercise (€130) is not taxed again, neither as professional income nor under the CGT.
In cases where the shares are sold immediately upon exercise of the stock options, there is typically no (or only negligible) capital gain, as the sale price will generally align with the market value at the time of exercise. As a result, no additional CGT should arise. This effectively prevents any further tax liability beyond the initial taxation at grant.
Sale of stock options
If the options themselves are transferred rather than exercised, the acquisition value is determined as the higher of (i) the market value at the moment the option first becomes exercisable or transferable, or (ii) the amount that was already taxed as a benefit in kind at grant. Only the increase in value beyond that reference point is subject to the CGT.
By way of illustration, if an option was taxed at €23 upon grant, had a market value of €35 when it became transferable, and is ultimately sold for €40, the taxable gain is limited to €5. This approach again reflects the principle that previously taxed employment income should not be taxed a second time.
Shares acquired at a reduced price
A similar logic applies to shares acquired at a reduced price in the context of employee participation plans. In such cases, the acquisition value for CGT purposes is stepped up to the market value at the time of acquisition, rather than the discounted subscription price.
For example, where shares with a market value of €100 are acquired for €80 and subsequently sold for €110, only the €10 increase above the market value is considered for capital gains taxation. The initial discount of €20 remains outside the scope of taxation, provided that the statutory conditions of the Belgian stock option law are met.
Conclusion
Until recently, the Belgian tax treatment of employee stock options was relatively straightforward: once taxed at grant, no further tax implications typically arose. In cross-border situations, however, a relocation before exercise could create a mismatch, as most countries tax at exercise, potentially leading to economic double taxation.
The Belgian dynamic has now changed. While taxation at grant remains key, the introduction of the CGT means that any increase in value after exercise may become taxable. In particular, where shares are not sold immediately upon exercise, an additional layer of taxation can arise.
As a result, timing has become crucial. What was once a relatively predictable regime now requires more careful planning.
Key takeaways
- Employee Stock Options in Belgium remain primarily taxed at grant (or at exercise for non-qualifying options), under the existing regime.
- The new CGT generally applies only to gains realized after exercise or transfer.
- Amounts already taxed as employment income are typically not taxed again.
- Timing of exercise and sale has become more important and may affect the overall tax outcome.