401(k) Paycheck Calculator — How Contributions Affect Your Take-Home Pay (2026)

Contributing to a 401(k) does not cost you as much as you think. Every dollar you put in reduces your taxable income, which lowers your federal and state income tax. The real cost to your paycheck is smaller than the contribution amount.

This free calculator shows you exactly how a 401(k) contribution changes your take-home pay, and how much you save in taxes at any income level.

Annual salary

Your contribution (%)

Employer match (%)

Match cap (% of salary)

Years to retirement

Expected annual return (%)

Filing status

State

Bi-weekly take-home pay at different contribution levels

Annual tax savings

$1,350.00

Your annual contribution$4,500.00

Employer match (annual)$2,250.00

Total annual to 401(k)$6,750.00

Projected balance at retirement

$637,610

In 30 years at 7% annual return

Want a personalized plan?

A free 15-min call with a financial advisor can optimize your retirement strategy.

Get Matched

How a 401(k) Reduces Your Tax Bill

A traditional 401(k) is a pre-tax contribution. Your contribution comes out of your paycheck before federal income tax and state income tax are calculated. This means you do not pay income tax on that money now. You pay taxes later, when you withdraw the funds in retirement.

Here is a simple example. A worker earning $65,000 per year, filing single, in the 22% federal bracket, contributes 6% of their salary ($3,900 per year, or $150 per bi-weekly paycheck).

That $150 reduces their taxable income for that pay period. Federal tax savings: $150 x 22% = $33. State tax savings (assuming 5% rate): $150 x 5% = $7.50. Total tax savings: $40.50 per paycheck.

The actual reduction in take-home pay is $150 minus $40.50 = $109.50. The worker is saving $150 toward retirement but only losing $109.50 in take-home pay. The government covers the $40.50 difference through reduced withholding.

2026 401(k) Contribution Limits

The IRS adjusts 401(k) limits annually for inflation. For 2026, the limits are:

Employee contribution limit: $23,500 per year for workers under age 50. This is the maximum you can put in from your own paycheck.

Catch-up contribution: Workers age 50 and older can contribute an additional $7,500 per year, for a total of $31,000.

Super catch-up contribution: Workers age 60, 61, 62, and 63 qualify for an enhanced catch-up contribution of $11,250 instead of $7,500, for a total of $34,750. This was added by the SECURE 2.0 Act and takes effect in 2025 and beyond.

Employer match does not count toward your employee limit. If your employer matches 4% of your salary, that match is in addition to the $23,500 limit.

Combined limit (employee plus employer contributions): $70,000 for workers under 50 in 2026.

Traditional 401(k) vs. Roth 401(k)

A traditional 401(k) uses pre-tax dollars. Contributions reduce your taxable income now. You pay taxes on withdrawals in retirement. This is better for workers who expect to be in a lower tax bracket in retirement than they are today.

A Roth 401(k) uses after-tax dollars. Contributions do not reduce your taxable income now. But qualified withdrawals in retirement are completely tax-free, including all the growth. This is better for younger workers who expect their income to increase significantly before retirement.

Both options have the same $23,500 contribution limit in 2026. You can split contributions between traditional and Roth within that limit.

Use the calculator above to compare how each option affects your paycheck today.

Employer Match — Free Money You Should Not Leave Behind

Most employers match a percentage of your contributions up to a limit. A common match structure is 100% of contributions up to 3% of salary, then 50% of contributions on the next 2%.

For a worker earning $60,000, this means: contribute $1,800 (3%) and get $1,800 free. Contribute the next $1,200 (2%) and get $600 free. Total employer contribution: $2,400 per year.

Workers who contribute less than the match threshold leave employer money on the table. At $60,000 with a 3% + 2% match structure, not contributing enough to capture the full match costs you $2,400 per year in free compensation.

The employer match never counts against your $23,500 employee limit.

Does a 401(k) Reduce FICA Taxes?

No. Traditional 401(k) contributions reduce federal and state income taxes, but not Social Security or Medicare.

FICA is calculated on your gross wages, not your taxable income. A 6% 401(k) contribution does not reduce your Social Security or Medicare withholding. This is one key difference from HSA contributions, which reduce FICA as well as income tax when made through payroll.

How Much Should You Contribute?

Financial planners commonly recommend contributing at least enough to capture your full employer match, then increasing from there.

A starting target for workers who want to retire at 65 with adequate savings is 10% to 15% of gross salary per year, including the employer match. Workers who start saving later in their career typically need to save at a higher rate.

Use the calculator to find the contribution percentage that balances your current take-home pay needs with your retirement savings goal. Small increases make a large difference over time. Going from 3% to 6% on a $55,000 salary only costs about $95 per bi-weekly paycheck after tax savings, but adds $1,650 to your retirement savings per year.

Frequently Asked Questions — 401(k) Calculator

How much does a 401(k) contribution actually reduce my paycheck?+

A traditional 401(k) contribution reduces your paycheck by less than the contribution amount because it lowers your taxable income. For a worker in the 22% federal bracket plus a 5% state income tax rate, a $200 bi-weekly contribution only reduces take-home pay by about $146. The other $54 comes from reduced income tax withholding. The higher your tax bracket, the smaller the real cost of each contribution dollar.

What is the 401(k) limit for 2026?+

The 2026 401(k) employee contribution limit is $23,500 per year for workers under age 50. Workers age 50 and older can contribute up to $31,000 with the standard $7,500 catch-up contribution. Workers age 60 through 63 can contribute up to $34,750 due to the SECURE 2.0 enhanced catch-up contribution of $11,250. Employer matching contributions do not count toward these limits.

Can I contribute to a 401(k) and an IRA in the same year?+

Yes. Contributing to a 401(k) does not prevent you from also contributing to a traditional IRA or Roth IRA. The 2026 IRA contribution limit is $7,000 per year, or $8,000 if you are age 50 or older. However, if you or your spouse have access to a workplace retirement plan, your ability to deduct traditional IRA contributions on your taxes phases out at certain income levels. Roth IRA contributions also phase out at higher income levels. Contributing to both maximizes your tax-advantaged savings space.

Does a 401(k) contribution affect my state income tax?+

Most states follow the federal treatment and exclude traditional 401(k) contributions from state taxable income. This means your state income tax withholding also drops when you increase your 401(k) contribution. A few states, including Pennsylvania and New Jersey, do not allow pre-tax 401(k) treatment for state income tax purposes. Workers in those states still benefit from federal tax savings but do not get the state income tax reduction.

What is a 403(b) and is it the same as a 401(k)?+

A 403(b) is a retirement plan offered by public schools, nonprofits, and some government employers. It works the same way as a 401(k) for contribution limits and tax treatment. The 2026 contribution limit is also $23,500 with the same catch-up rules. The primary difference is which employers offer each plan type. Government workers may also have access to a 457(b) plan, which allows an additional $23,500 in contributions on top of a 403(b) or 401(k).

This 401(k) calculator provides estimates for planning purposes only. It does not constitute financial or tax advice. Consult a qualified financial advisor or tax professional for advice specific to your retirement situation.