Taxability

Yes. Thailand applies capital gains tax on the entire gain, calculated from the original purchase price, even if you bought the shares long before moving to Thailand. This can create a significant exposure if your portfolio has grown over time. The problem is compounded by the Dutch “exit tax” (emigration levy on unrealised gains) which can mean you face tax in both countries. Careful planning—such as timing disposals before moving, or using treaty relief where possible—is often required to minimise this double hit.