How do you oust a shareholder from an s-corp?

Of course they can.

any number it can be other than promoter

Only if the y are ALSO company employees.

File an 8832, apply for a new EIN. Get a CPA there are some tricky tax treatmetns, look up BIG tax.

in the US, you want an s corp if you want more personal investment in the company. c corp is more limited liability. also for s corp there is no corporate tax rate (it's the same as your personal...