You pay tax as a percentage of your income in layers called tax brackets. As your income goes up, the tax rate on the next layer of income is higher. When your income jumps to a higher tax bracket, you do not pay the higher rate on your entire income. You pay the higher rate only on the part that is in the new tax bracket.

For more information visit the IRS Website

Tax rate SingleMarried filing jointlyMarried filing separatelyHead of household
10%$0 to $11,600$0 to $23,200$0 to $11,600$0 to $16,550
12% $11,601 to $47,150$23,201 to $94,300 $11,601 to $47,150 $16,551 to $63,100
22% $47,151 to $100,525$94,301 to $201,050$47,151 to $100,525$63,101 to $100,500
24%$100,526 to $191,950$201,051 to $383,900$100,526 to $191,950$100,501 to $191,950
32% $191,951 to $243,725$383,901 to $487,450$191,951 to $243,725$191,951 to $243,700
35% $243,726 to $609,350$487,451 to $731,200$243,726 to $365,600$243,701 to $609,350
37% $609,351 or more $731,201 or more$365,601 or more$609,351 or more