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
$890
$22,198
5%
$1,250
$765
$21,073
10%
$2,500
$640
$19,948
15%
$3,750
$515
$18,823
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 $22,198 for a single filer in a state with no income tax, based on 2026 federal brackets, Social Security and Medicare. That is $1,849.79 a month or $853.75 every two weeks.
What tax bracket is $25,000 in?
For a single filer, after the standard deduction the top dollars are taxed at 10%. The average federal income tax rate is much lower, 3.6%, because lower brackets apply first.
How much does a 401(k) save in tax?
Putting 10% ($2,500) into a traditional 401(k) lowers federal income tax by about $250 a year for a single filer, so take-home pay drops by less than the amount you save.