Professor Edwin Heithuis of the University of Amsterdam criticizes the new Dutch Box 3 tax system, set to be implemented in 2028, which will tax unrealized capital gains. He argues that this "wealth accrual tax" is an outlier globally, as no other country imposes such a system, potentially leading to double taxation for immigrants and encouraging emigration. Heithuis highlights that this system, unlike corporate tax or Box 2, taxes paper gains annually at 36% (with a €1,800 exemption), forcing investors to sell assets to pay taxes, even if stock values have fallen. He advocates for an integrated capital gains tax, levied only upon actual profit distribution, citing the previous forfaitary system's failure as a cautionary tale against unilateral tax policy in a globalized world.