That's far too low. Tax brackets should function to effectively prevent anyone from obtaining the type of wealth that the wealthiest Americans enjoy. The highest tax bracket should be a 99% tax.
It's been tried, didn't work.
Britain had a top tax rate of 95% at the height of the Beatles popularity - they wrote a song about it and moved their business location outside the UK.
We had a similar high tax rate before the Kennedy administration, then Kennedy cut the top tax RATE in half (IIRC) and tax REVENUE soared!
Ronald Reagan told the story about how he got around the aggressive income tax rates when he was in Hollywood as an actor. Once his income approached the highest tax level, he simply stopped working for the rest of the year. He hated doing that because it reduced the number of films produced in Hollywood, which limited opportunities for all the people that would have worked on those movies he didn't make. The high tax rate hurt the workers, not the rich.
NJ imposed a so-called millionaires tax on, among other things, yachts - guess what happened? Boat manufacturers and boat sellers all closed up shop and moved to tax-friendly states to avoid the punitive NJ tax on high-end boats. And who did that hurt? The folks that worked in the boat yards that couldn't afford to move out of state.
Thinking you can just soak the rich is pure folly, they can afford to move. I remember when one rich person left NJ and moved to Florida - the state of New Jersey had to re-adjust the state budget to account for the lost tax revenue from just the one taxpayer.
Source: https://ancillary-proxy.atarimworker.io?url=https%3A%2F%2Fwww.nytimes.com%2F2016%2F0...