It's astounding that people smart enough to land a job that pays enough to push them into the higher rate band of income tax are so often confused about how their taxes are actually calculated!
Of course, there are always edge cases, and the government has deliberately made some areas a mess (case in point: contractors); but the base use case of standard salary is insanely simple. And, for our American friends, the NHS is included.
If I explain to the same people that I use a spreadsheet for all my daily transactions I am looked at like I’m some kind of weirdo.