No matter what the tax rate is, businesses and corporations will always look for ways to pay less tax. On the other hand, most people who get a salary can't use similar tactics to lower their tax payments. I don't think that changing the tax system alone is the best way to deal with the difference in wealth. Rich people have a lot of social ties, so any policy changes are likely to only work for a short time before they find ways to get around them. Also, the biggest cause of the wealth gap is making money, which tends to help the rich first and the poor only after inflation has lowered the value of the currency.