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Money you put into a traditional 401(k) comes out of your pay before income tax. So a contribution doesn't reduce your take-home pay by its full amount: part of it is money that would have gone to tax anyway. This post works out how big that part is at different salaries, using the 2026 rules and the same engine as our calculator.
The short answer
On a $100,000 salary, contributing 6% ($6,000) saves $1,320 in tax in Texas, which has no state income tax, and $1,878 in California, where state income tax is saved too. So in California each dollar you contribute only reduces your take-home pay by about 69 cents.
What a 401(k) does and doesn't reduce
- Federal income tax: reduced, at your top federal rate.
- State income tax: reduced in most states. Pennsylvania is an exception: it taxes 401(k) contributions.
- Social Security and Medicare: not reduced. They are charged on your full salary.
The 2026 limit for employee contributions is $24,500, plus catch-up contributions if you are 50 or older (not modelled here).
The figures
Texas
| Salary | 6% contribution | Tax saved | Real cost to your pay | Maximum contribution | Tax saved at max |
|---|---|---|---|---|---|
| $50,000 | $3,000 | $360 | $2,640 | $24,500 | $2,880 |
| $75,000 | $4,500 | $990 | $3,510 | $24,500 | $3,790 |
| $100,000 | $6,000 | $1,320 | $4,680 | $24,500 | $5,390 |
| $150,000 | $9,000 | $2,160 | $6,840 | $24,500 | $5,880 |
| $200,000 | $12,000 | $2,880 | $9,120 | $24,500 | $5,880 |
California
| Salary | 6% contribution | Tax saved | Real cost to your pay | Maximum contribution | Tax saved at max |
|---|---|---|---|---|---|
| $50,000 | $3,000 | $540 | $2,460 | $24,500 | $3,794 |
| $75,000 | $4,500 | $1,350 | $3,150 | $24,500 | $5,498 |
| $100,000 | $6,000 | $1,878 | $4,122 | $24,500 | $7,633 |
| $150,000 | $9,000 | $2,997 | $6,003 | $24,500 | $8,158 |
| $200,000 | $12,000 | $3,996 | $8,004 | $24,500 | $8,158 |
"Real cost to your pay" is the contribution minus the tax it saves: how much less you actually take home. Employer matching contributions are extra money on top and are not included.
Why higher earners save more
Each dollar you contribute is taken off the top of your income, where your highest tax rate applies. A higher salary means a higher top rate, so the same contribution saves more tax. At the maximum, the saving stops growing once the whole $24,500 sits inside the same tax bracket.
Try your own numbers with the US salary calculator: choose a 401(k) percentage and watch the take-home pay change.
Sources
- IRS — Rev. Proc. 2025-32: 2026 tax rate tables and standard deduction
- IRS — 2026 inflation adjustments, including One Big Beautiful Bill amendments
- Social Security Administration — 2026 contribution and benefit base ($184,500)
- IRS — 401(k) limit increases to $24,500 for 2026
- Tax Foundation — 2026 state individual income tax rates and brackets
- California EDD — 2026 SDI rate (1.3%, no wage limit)
- NY Department of Financial Services — 2026 Paid Family Leave rate
- NJ Department of Labor — 2026 TDI, FLI and UI rates and wage bases
- Washington ESD — 2026 Paid Family & Medical Leave premium
- Rhode Island DLT — 2026 TDI rate and wage base
- Missouri DOR — federal income tax deduction
Figures computed with the rates on these pages, last checked on 2 October 2026.