at this point, don't start any entity. just do a sole ownership. save yourself the time and the money. the cost of the entity, the annual fees. there not many advantages left for an entity. used to be that the only way to have your health insurance deducted was through a c corp but you can now even deduct health ins. in a sole prop. there is one advantage left of an entity and that is you can set up retirement accounts IF you pay yourself a wage and pay SS etc.. in a sole prop. you cant do that because your trading income is not earned income but cap gains. But in summary, i'd stay a sole owner.