Well, yes. That's what earning more money means, after tax, you have more leftover.
I earn minimum wage, but I pay the same % tax as someone earning £50,000. They will, obviously, have more money left over.
But lets tax everyone down to the same level, shall we?
It's estimated that the basic cost of living is £2,500 per month in the UK. To add a tiny safety net (but not too much, of course!) let's sat that's £3,000 per month. £36,000 per year.
Whether your base salary is £50,000 or £500,000, you get £36k per year.
If you're on less than that, the government tops it up. Brilliant, right? The wealth is redistributed!
People will lose their homes, of course. Businesses will fail, because people can't afford luxuries anymore. But wealth has been redistributed, for all of a year.
It would never work. Encouraging upwards social mobility is far better than advocating for bringing people down.