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
$18,734
$96,704
5%
$6,250
$17,295
$91,893
10%
$12,500
$15,920
$87,018
15%
$18,750
$14,545
$82,143
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 $96,704 for a single filer in a state with no income tax, based on 2026 federal brackets, Social Security and Medicare. That is $8,058.63 a month or $3,719.37 every two weeks.
What tax bracket is $125,000 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, 15.0%, because lower brackets apply first.
How much does a 401(k) save in tax?
Putting 10% ($12,500) into a traditional 401(k) lowers federal income tax by about $2,814 a year for a single filer, so take-home pay drops by less than the amount you save.