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Putting 6% of your pay into a 401(k) doesn't mean your paycheck drops by 6%. Traditional (pre-tax) contributions come out before income tax, so part of every dollar you save is money that would otherwise have gone to the IRS and your state. This article shows how much take-home pay you really give up in 2026, with figures from our 401(k) paycheck calculator.
Short answer
A traditional 401(k) contribution reduces your take-home pay by the contribution minus the income tax it saves. For a single filer on $85,000 in Texas, each $1 contributed costs 78 cents of take-home pay; in California, about 69 cents, because state income tax is saved too. So a $500 contribution lowers take-home pay by about $390 in Texas and about $344 in California.
Why a 401(k) costs less than you put in
Traditional 401(k) contributions are taken from your pay before federal income tax and, in most states, before state income tax. Your taxable income falls by the amount you contribute, so the tax withheld from each paycheck falls too. The money you lose from take-home pay is the contribution minus that tax saving.
Social Security (6.2%) and Medicare (1.45%) are different: they're still charged on your full salary, so a 401(k) doesn't reduce them.
Examples at 3%, 6% and 10%
Single filer, $85,000 salary, paid every two weeks (26 paychecks), 2026 tax rules.
Texas (no state income tax)
| Contribution | Per paycheck | Take-home falls by | Tax saved per year |
|---|---|---|---|
| 3% ($2,550 a year) | $98.08 | $76.50 | $561 |
| 6% ($5,100 a year) | $196.15 | $153 | $1,122 |
| 10% ($8,500 a year) | $326.92 | $255 | $1,870 |
Take-home pay without a contribution is $2,639.54 per paycheck. Every contribution here falls in the 22% federal bracket, so each dollar saves 22 cents of tax.
California
| Contribution | Per paycheck | Take-home falls by | Tax saved per year |
|---|---|---|---|
| 3% ($2,550 a year) | $98.08 | $67.38 | $798 |
| 6% ($5,100 a year) | $196.15 | $134.77 | $1,596 |
| 10% ($8,500 a year) | $326.92 | $225.58 | $2,635 |
Take-home pay without a contribution is $2,456.27 per paycheck. California income tax is saved as well as federal, so the same contribution costs less take-home pay than in Texas.
The 2026 limits
| 2026 limit | |
|---|---|
| Employee contributions | $24,500 |
| Extra catch-up, age 50 or over | $8,000 |
| Extra catch-up, age 60 to 63 (instead of $8,000) | $11,250 |
From 2026, if your wages from the employer were over $150,000 in the previous year, your catch-up contributions must be made as Roth (after-tax) contributions. The 401(k) calculator caps contributions at the limit and leaves Roth catch-up out of the pre-tax saving.
Don't forget the employer match
Many employers add a match, for example 50 cents per dollar on the first 6% of pay. The match doesn't affect your paycheck at all: it goes straight into your 401(k). If you contribute less than the amount needed to get the full match, you're leaving part of your pay on the table. Check your plan's terms.
Traditional or Roth?
A Roth 401(k) works the other way round: no tax saving now, so each dollar costs a full dollar of take-home pay, but qualified withdrawals in retirement are tax-free. Which is better depends on whether your tax rate is higher now or in retirement. Compare them with the Roth vs traditional calculator, and see how contributions affect your whole paycheck in the paycheck calculator.
Sources
Frequently asked questions
How much will a 6% 401(k) contribution reduce my paycheck?
Less than 6%. On an $85,000 salary paid every two weeks, a 6% traditional 401(k) contribution is $196.15 per paycheck but cuts take-home pay by $153 in Texas and $134.77 in California, because the contribution isn't subject to federal or state income tax.
Does a 401(k) contribution reduce Social Security and Medicare tax?
No. Traditional 401(k) contributions lower federal income tax and, in most states, state income tax, but Social Security and Medicare are still charged on the full salary.
What is the 401(k) contribution limit for 2026?
$24,500 of employee contributions. People aged 50 or over can add a catch-up of $8,000, or $11,250 at ages 60 to 63. From 2026, catch-up contributions for people whose prior-year wages were over $150,000 must go into a Roth account.
Is a Roth 401(k) different?
Yes. Roth contributions are made after tax, so each dollar you contribute reduces take-home pay by a full dollar now, but qualified withdrawals in retirement are tax-free. Compare the two with the Roth vs traditional calculator.
The CountYourTax team
We build free tax and salary calculators and check the rates against official government sources. See how we check our numbers.
General information, not tax advice. Please consult a qualified tax professional before filing or making financial decisions. Report an error in this article