401(k) Paycheck Impact Calculator
See how much a 401(k) contribution lowers your take-home pay. Compare net pay before and after, plus the federal tax you save and your employer match.
401(k) Paycheck Impact Calculator
Gross Pay Per Paycheck
Pay Frequency
Filing Status
Contribution Type
Your Contribution
Employer Match
Current Age (optional)
You contribute $0.00 but your paycheck only drops $0.00.
Plus $0.00 in employer match added on top.
Estimate using 2026 federal income tax and FICA only. No state tax. Actual withholding depends on your W-4 and plan rules.
Annual Totals
Track Your Real Take-Home Pay
ClockWage44 runs the same paycheck engine across every logged shift and job, applying 401(k) deductions, federal and state tax, and FICA to the cent.
How 401(k) Contributions Change Your Take-Home Pay
Here is the surprise most people hit when they first sign up for a 401(k): your paycheck does not shrink by the full amount you contribute. With a traditional (pre-tax) 401(k), the money is withheld before federal income tax is calculated. That lowers your taxable wages, so the tax you would have paid on those dollars stays in your pocket.
Picture a $200 contribution from someone in the 22% federal bracket. The contribution shields $200 from income tax, saving roughly $44. So while $200 leaves your gross pay, your take-home only drops by about $156. That $156 is the effective cost of putting $200 toward retirement. The bigger your marginal bracket, the smaller the hit to your paycheck.
Traditional vs. Roth: Which Hits Your Paycheck Harder?
A traditional 401(k) reduces your take-home pay by less now, because the contribution is pre-tax. The trade-off is that withdrawals in retirement are taxed as ordinary income. A Roth 401(k) uses after-tax money, so your paycheck drops by the full contribution today, but qualified withdrawals in retirement come out tax-free.
One detail trips up almost everyone: Social Security and Medicare (FICA) taxes apply to both types, calculated on your full gross pay. A traditional 401(k) defers federal income tax, not FICA. That is why this calculator shows the same FICA figure before and after, so you can see the roughly 7.65% you still owe either way.
Don't Skip the Employer Match
An employer match is extra money your employer deposits into your 401(k) on top of what you put in. It does not come out of your paycheck. A common formula is a 50% match up to 6% of pay, which means contributing 6% earns you an extra 3% of pay in free money. Contribute less than the cap and you forfeit part of that match.
The match is one of the best returns available to most workers: an instant 50% return on the matched dollars before any market growth. And because employer match dollars do not count toward your personal deferral limit, they stack on top of the $24,500 you are allowed to contribute yourself in 2026.
2026 Contribution Limits and What They Mean for Your Paycheck
The 2026 elective deferral limit is $24,500. Workers age 50 and older can add an $8,000 catch-up, and ages 60 to 63 get an enhanced catch-up of $11,250 instead. Social Security tax applies to wages up to the 2026 wage base of $184,500; above that, Social Security stops while Medicare continues. This calculator flags you if your annual contribution would exceed the applicable limit.
These figures are a single-paycheck preview. To see how a 401(k) deduction plays out across every shift you work and across multiple jobs, with federal tax, state tax, and FICA all resolved to the cent, the ClockWage44 app tracks your hours and your real take-home pay on-device.
Frequently Asked Questions
Common questions about 401(k) paycheck impact calculator
How does a 401(k) contribution affect my paycheck?
With a traditional (pre-tax) 401(k), your take-home pay drops by less than the amount you contribute. The contribution is withheld before federal income tax is calculated, so it lowers your taxable wages. Roth (after-tax) contributions come out of net pay, so your paycheck drops by the full contribution amount.
Why does my take-home pay only drop by less than I contribute?
A traditional 401(k) contribution is shielded from federal income tax. If you contribute $200 and that contribution would have been taxed at 22%, you save about $44 in federal tax. Your paycheck only drops by the contribution minus the tax you save, which is the effective cost shown here.
Do I still pay Social Security and Medicare (FICA) tax on 401(k) contributions?
Yes. FICA (6.2% Social Security up to the wage base, plus 1.45% Medicare) applies to your full gross pay regardless of how much you contribute, for both traditional and Roth. Only federal income tax is deferred with a traditional 401(k). That is why the FICA figure is the same before and after in this calculator.
What is the difference between a traditional (pre-tax) and Roth (after-tax) 401(k) for my paycheck?
A traditional 401(k) lowers your take-home pay by less than the contribution because it reduces taxable income now, and you pay tax on withdrawals in retirement. A Roth 401(k) lowers take-home by the full contribution now because it uses after-tax money, but qualified withdrawals in retirement are tax-free.
How much can I contribute to a 401(k) in 2026?
The 2026 elective deferral limit is $24,500. If you are age 50 or older you can add an $8,000 catch-up contribution, and ages 60 to 63 can use an enhanced catch-up of $11,250 instead of $8,000. Employer match dollars do not count toward your personal deferral limit.
Does my employer match reduce my take-home pay?
No. The employer match is money your employer deposits into your 401(k) on top of your own contribution. It does not come out of your paycheck, so it never reduces your take-home pay. It is effectively free money toward retirement.
How much should I contribute to get the full employer match?
At least up to your plan's match cap. A common formula is a 50% match up to 6% of pay, so contributing 6% earns the full match (an extra 3% of pay). Contributing less than the cap leaves match money unclaimed; contributing more earns no additional match.
Will contributing more to my 401(k) lower my tax bracket?
A traditional 401(k) contribution lowers your taxable income, and a large enough contribution can drop part of your income into a lower marginal bracket. That increases your per-dollar tax savings. Roth contributions do not lower taxable income, so they do not change your bracket now.