system
A chat on subreddit /r/NoStupidQuestions
human
The US has a progressive tax system. Tax brackets for an individual are:

10% of income $0-$10,275

12% for income $10,275 - $41,775

22% of income $41,775 -$89,085

24% of income $89,085 - $179,050

So for every dollar you earn over $100,000 you are paying 24 cents in tax *on that dollar*. But the tax you pay for income up to $100,000 isn’t affected by additional income. 

Please note that this is based on adjusted gross income. Also, the rates are different if you are married.
gpt
It is NOT every dollar over 100k. Using your  example every dollar over 89,085 up to 179, 050 is in the 24% bracket. So the only dollars taxed at 24 percent if you make 100k is 100,000 minus 89085 is 10915. 


It always pays more to make more. There are some instances where you phase out of certain tax credits like child tax credit, but that is well beyond this discussion.