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Does my net paycheck decrease as the year goes on due to tax brackets filling up?
It seems that you are misunderstanding how your taxes are calculated. You seem to be under the impression that once you pass $37,450 annual income, ALL of your income will be taxed at 25%. However, in reality, only the income you earn above that amount will be taxed at 25%. You can use this chart to determine exactly how much federal tax you will pay;  As you can see, if you earned, $37,500 in a year, you would only be charged 25% taxes on $50 (and you will pay 15% on the amount between $9226 and $37450, and 10% on the amount from $0 to $9225, which is $5126.25 when summed together).