I'm for a flat tax...
Everyone (including corporations and banks) should have to pay a set percentage of their net worth in tax.
i.e. The people / corporations who hold 90% of the Nation's wealth should be paying 90% of all taxes...
This is my common approach to attempt to redefine the concept of a "Flat Tax".
Each pays a flat percentage of their net worth.
(This only works if corporations and private banks are included)