401(k) Contribution Calculator
Estimate your annual 401(k) contributions, employer matching dollars, and immediate tax savings based on your salary and plan details. Use this when enrolling in a plan or deciding how much to contribute.
Last updated: September 2026
Formula below · 2 sources (IRS, Wikipedia) · Updated Sep 2026
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About this calculator
This calculator computes three components of your 401(k) benefit and sums them. The formula is: Total Benefit = yourContribution + employerMatch + yourContribution × taxBracket / 100, where yourContribution = annualSalary × contributionPercent / 100, capped at the 2026 IRS elective-deferral limit of $24,500, and employerMatch = min(yourContribution, annualSalary × matchLimit / 100) × employerMatch / 100. The first term is your own pre-tax contribution. The second term is your employer's match — capped at the match limit to reflect that most employers only match contributions up to a set percentage of salary. The third term estimates your immediate tax savings: because 401(k) contributions are pre-tax, you avoid paying income tax on that money today. For 2026 the IRS limit on your own contributions is $24,500 ($32,500 at age 50 or older, $35,750 at ages 60-63); the calculator applies the under-50 limit, so add any catch-up separately. Federal income tax savings only: state tax savings are extra, and FICA still applies to 401(k) deferrals. Maximizing at least up to the employer match is widely considered the first step in retirement planning, as it represents an immediate 50–100% return.
How to use
Assume a $80,000 salary, 6% contribution, 50% employer match, 6% match limit, and a 22% tax bracket. Step 1: Your contribution = $80,000 × 0.06 = $4,800. Step 2: Employer match = $80,000 × min(6%, 6%) / 100 × 50% = $80,000 × 0.06 × 0.50 = $2,400. Step 3: Tax savings = $4,800 × 0.22 = $1,056. Step 4: Total benefit = $4,800 + $2,400 + $1,056 = $8,256. Your net out-of-pocket cost is only $4,800 − $1,056 = $3,744 to gain $8,256 in total retirement benefit.
Frequently asked questions
How does employer 401(k) matching work and how do I maximize it?
Most employers match a percentage of your contributions up to a cap — for example, 50% of contributions up to 6% of your salary. If you earn $80,000 and contribute at least 6%, your employer adds $2,400 per year at no additional cost to you. To maximize the match, always contribute at least up to the match limit; anything less leaves free money on the table. Some plans have a vesting schedule, meaning you must stay employed for 1–5 years before the employer contributions are fully yours.
What are the 401(k) contribution limits for 2026?
For 2026, the IRS allows employees to contribute up to $24,500 to a traditional or Roth 401(k). Workers aged 50 and older can add an $8,000 catch-up contribution (total $32,500), and workers aged 60 to 63 get a larger $11,250 catch-up (total $35,750). Starting in 2026, employees who earned more than $150,000 in FICA wages from the employer the prior year must make catch-up contributions as Roth. These limits cover employee deferrals; total contributions including the employer match cannot exceed $72,000 for 2026 (plus any catch-up). Limits are adjusted annually for inflation.
How much do 401(k) contributions reduce my taxable income?
Traditional 401(k) contributions are made pre-tax, directly reducing your adjusted gross income (AGI) for the year. If you contribute $6,000 and are in the 22% federal bracket, you save approximately $1,320 in federal taxes that year. State income tax savings are additional if your state taxes wages. Note that Roth 401(k) contributions are after-tax and provide no immediate tax reduction, but qualified withdrawals in retirement are completely tax-free, making them advantageous if you expect to be in a higher bracket later.