Systems differ by country, and part might be paid by state, part from non-governmental managed funds. Yet contributions are taxed from income. And then there is

Systems differ by country, and part might be paid by state, part from non-governmental managed funds. Yet contributions are taxed from income. And then there is whole split between private, municipal and state employees. Also in some countries it is not personal fund, but defined pension based on contributions with different times affecting in different ways. In general mandatory contributions that are then managed by myriad of ways. With possibly different ways of payouts.