For an American-operated startup, in what way does this actually save you money? Assuming you don't withhold information and lie, the IRS and your state will still tax you on pretty much all of your income anyway.
I'm not a CPA / lawyer so I do not know. You could incorporate withholding company A in the BVI (or another tax free jurisdiction) and then incorporate company B in the states (Delware?) and make some sort of operating agreement (company B 'consults' for company A and only pays taxes on the money company A pays it). Keep in mind that the board of directors of company A can be anonymous, and so can the shareholders. Consult the website, it differs from jurisdiction to another.
Again, I'm not a lawyer, I'm not an accountant, what I described above is a mere guess and depending on state / federal laws and regulations YMMV.
Again, I'm not a lawyer, I'm not an accountant, what I described above is a mere guess and depending on state / federal laws and regulations YMMV.