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
$29,534
$127,461
5%
$8,500
$27,494
$121,001
10%
$17,000
$25,454
$114,541
15%
$25,500
$23,414
$108,081
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 $127,461 for a single filer in a state with no income tax, based on 2026 federal brackets, Social Security and Medicare. That is $10,621.75 a month or $4,902.35 every two weeks.
What tax bracket is $170,000 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, 17.4%, because lower brackets apply first.
How much does a 401(k) save in tax?
Putting 10% ($17,000) into a traditional 401(k) lowers federal income tax by about $4,080 a year for a single filer, so take-home pay drops by less than the amount you save.