You are not allowed to pay yourself anything from the new company while on an H1-B.
If one of your co-founders, or investors, is a US citizen you *might* be able to arrange a transfer of the H1-B to the new company. This is difficult and expensive though (at least we found it so). I decided it was more sensible for me to just wait for the Green Card.
What about any revenues that your new company might make? Sorry if that is a stupid question, I have done almost no research into this issue yet.
Since I am a Canadian, I also wonder if it would be easier to just incorporate in Canada instead - this does not seem optimal either, as Canadian taxes are incredibly high, and the fact that I own a company there would mean that I would not be able to maintain non-residency status (and thus am not exempt from Canadian taxes) =(
The tax rate starts at 16% if you're poor poor poor like me and maxes at 33% or so total for both federal and provincial. Check into the US corporate tax rates. If I remember doing my research right, you might be better off being a Canadian.
Can you elaborate on your experience?