Is there a name for that, where whatever the limit is, people set things right at it? The same is true in progressive tax brackets, and the number of cancer cases that people get right when people are eligible for Medicare in the USA.
I might misunderstand you, but progressive tax brackets mean you pay extra money only on money earned after the limit. So if that line is $1000, under which the tax rate is 10%, you pay $100. Then if the tax rate above that is 20%, I pay that much only on the amount above $100. So if I make $1020, I pay 10% * $1000 + 20% * $20 = $102. (Not 20%*1020 = $204)
In other words, you can’t take home less money overall just because you crossed the line into a higher tax bracket. I felt it was worth mentioning because it’s an easy misconception to have.
Seems like it is common enough to have a name.