Everybody here is saying that a 75% tax is a barrier to entrepreneurship and will make most rich people flee.

Did you know that the federal income tax rate in the US was 91% on income over $200,000 (approx. $2.5 million in today's dollars) between 1946 and 1962?
Did it cause a great exile of brains and innovators?

I'm French, there's a good chance I will make more than 1 million a year in a few years, but I still welcome this 75% tax. Millionaires build their fortune on the shoulder of many people who implement their ideas, and thanks to a functioning government and a safe environment, which is payed for by taxes.
Also it's not as bad as it seems. If you earn $1'000'001, only the $1 dollar above 1 million is taxed at 75%. Plus, it is in fact a 50% tax which when social security charges are added reaches 75%