This isn't difficult...
Single
Taxable Income Tax Rate
$0—$9,275 10%
$9,276—$37,650 $927.50 plus 15% of the amount over $9,275
$37,651—$91,150 $5,183.75 plus 25% of the amount over $37,650
$91,151—$190,150 $18,558.75 plus 28% of the amount over $91,150
$190,151—$ 413,350 $46,278.75 plus 33% of the amount over $190,150
$413,351—$415,050 $119,934.75 plus 35% of the amount over $413,350
$415,051 or more $120,529.75 plus 39.6% of the amount over $415,050
Every single FO is paying the bonus where their income says they should be. This is what happens when you make money. You pay more than you are used to.