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.
About this calculator
This calculator computes three components of your 401(k) benefit and sums them. The formula is: Total Benefit = (annualSalary × contributionPercent / 100) + (annualSalary × min(contributionPercent, matchLimit) / 100 × employerMatch / 100) + (annualSalary × contributionPercent / 100 × taxBracket / 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. In 2024, the IRS contribution limit is $23,000 ($30,500 if you're 50 or older). 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 2024?
For 2024, the IRS allows employees to contribute up to $23,000 to a traditional or Roth 401(k). Workers aged 50 and older can make an additional catch-up contribution of $7,500, bringing their limit to $30,500. These limits apply to employee contributions only; total combined contributions including employer match cannot exceed $69,000 (or $76,500 with catch-up). Contribution limits are adjusted annually for inflation, so it's worth checking the IRS website each year.
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.