Pre-tax retirement savings shrink your taxable income, so each dollar saved costs you less than a dollar of take-home pay.
401(k) rate
Saved per year
Federal tax
Take-home
0%
$0
$24,734
$113,791
5%
$7,500
$22,934
$108,091
10%
$15,000
$21,134
$102,391
15%
$22,500
$19,334
$96,691
With state income tax
State tax depends on where you live. These rows show the effect of a flat rate on top of federal taxes; plug your own state's rate into the paycheck calculator.
About $113,791 for a single filer in a state with no income tax, based on 2026 federal brackets, Social Security and Medicare. That is $9,482.58 a month or $4,376.58 every two weeks.
What tax bracket is $150,000 in?
For a single filer, after the standard deduction the top dollars are taxed at 24%. The average federal income tax rate is much lower, 16.5%, because lower brackets apply first.
How much does a 401(k) save in tax?
Putting 10% ($15,000) into a traditional 401(k) lowers federal income tax by about $3,600 a year for a single filer, so take-home pay drops by less than the amount you save.