Very curly indeed. I will say that is a good example of differences in tax systems. The concessional tax environment for super funds was introduced to try and incentivise people to save for retirement because too many Australian's were just relying on the govt pension and it was rightly recognised that this was not sustainable. From the perspective of the American tax system you can imagine they would have zero interest in that policy objective and would not be inclined to provide tax concessions. At the end of the day though a super fund is just a special type of trust.