Pension and social security system
As an employee of TU Delft, you will be required to contribute to two funds that will hold and invest part of your income until the moment in the – possibly rather remote – future when you need to draw on the fund, probably because of retirement, and legally qualify to draw on it. These funds are a pension fund and the social security system of the Netherlands. How generous they are to those who depend on them is a subjective question, but their solidity and fiscal reliability are almost universally acknowledged.