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
$17,570
$93,250
5%
$6,000
$16,250
$88,570
10%
$12,000
$14,930
$83,890
15%
$18,000
$13,610
$79,210
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 $93,250 for a single filer in a state with no income tax, based on 2026 federal brackets, Social Security and Medicare. That is $7,770.83 a month or $3,586.54 every two weeks.
What tax bracket is $120,000 in?
For a single filer, after the standard deduction the top dollars are taxed at 22%. The average federal income tax rate is much lower, 14.6%, because lower brackets apply first.
How much does a 401(k) save in tax?
Putting 10% ($12,000) into a traditional 401(k) lowers federal income tax by about $2,640 a year for a single filer, so take-home pay drops by less than the amount you save.