You should be able to take out your company pension, AHV, with a small tax charge, 8% maybe. For Social Security, there is Social Security agreement between the US and Ch, so you won't collect anything on this. You need to contact the AHV office, plus do you know where you company pension money is sitting now? Probably in one of the Vested Funds foundations, so you will need to contact them also, you should find out from your previous employer.