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
$25,934
$117,209
5%
$7,750
$24,074
$111,319
10%
$15,500
$22,214
$105,429
15%
$23,250
$20,354
$99,539
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 $117,209 for a single filer in a state with no income tax, based on 2026 federal brackets, Social Security and Medicare. That is $9,767.38 a month or $4,508.02 every two weeks.
What tax bracket is $155,000 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, 16.7%, because lower brackets apply first.
How much does a 401(k) save in tax?
Putting 10% ($15,500) into a traditional 401(k) lowers federal income tax by about $3,720 a year for a single filer, so take-home pay drops by less than the amount you save.