Basically, none. A US resident is taxed just like a citizen. In fact, even if you are not a green card holder, but have a "substantial presence" in the US, you are still taxed like a citizen.
Marc de Piolenc An Metet wrote: > > What are the tax implications of a US resident green card holder, with substantial >assets both in his original nation and in the US, of becoming a US citizen? -- Remember September 11, 2001 but don't forget July 4, 1776 They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety. - Benjamin Franklin