How much does the highest salaried person make? Whatever % would leave that person with 200k/year sounds good. No one needs more than that amount.
So you want a marginal tax rate of 100% for income in excess of 200K per year?
Sounds like the Occupy plan. A hard cap on income from all sources is needed mathematically to achieve the wealth disparity reduction they espouse.
It would be a great way to turbocharge the barter system. 
On a side note, when Ingmar Bergman realized that his marginal tax rate in Sweden was 101%, he emigrated. 
He was actually arrested by the police in the middle of a rehearsal at the theatre. Then he left the country in protest. Astrid Lindgren, author of Pippi Longstocking and other children stories, wrote a story about the 100%+ tax rates she was paying, which is often credited with contributing to the centre-right finally winning in 1976.
I don't fully understand why people think equality is so important that it is preferable to make everyone poorer just to achieve it.
Everyone wouldn't get poorer, just the rich. And I don't see the problem there.
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