A 401(k) is one of the most powerful retirement savings tools available, especially when your employer offers a match. Our 401k calculator with employer match models all the moving parts: your salary, employee contribution percentage, employer match percentage and cap, expected annual return, salary growth, and inflation. Get a year-by-year projection of your 401(k) balance, total contributions from you and your employer, total investment growth, and an estimate of your retirement income using the 4% safe withdrawal rule. Works for both Traditional and Roth 401(k) plans, and warns you if you hit the IRS annual contribution limit.
Pre-tax contributions, taxed at withdrawal
100% = $1 per $1
% of salary
Tell us your current age and when you plan to retire.
Input your annual salary and any existing 401(k) balance.
How much of your salary you contribute, plus your employer's match terms.
Set your expected return, salary growth, and inflation rate.
See your final balance, total contributions, growth, and estimated retirement income.
Each year your existing balance compounds at the expected return, then your contributions and the employer match are added. The employer match is capped — most employers match 100% up to 6% of salary, meaning if you contribute 6% they add another 6%. Contribute less than the cap and you leave free money on the table. Contribute more and the extra is unmatched.
Balance(t) = Balance(t-1) × (1+r) + Salary(t) × ContribPct + min(Salary(t) × ContribPct, Salary(t) × MatchCap) × MatchPct
Always contribute at least enough to capture the full employer match — it's free money
Most employers match 50-100% up to 3-6% of salary; check your plan's specific match formula
2024 IRS limit is $23,000/year ($30,500 if age 50+) — high earners may hit this
Roth 401(k) contributions are taxed now, withdrawals are tax-free; Traditional is the opposite
Aim for 15% total savings rate (employee + employer) for a comfortable retirement
Increase contribution percentage by 1% each year — you'll barely notice it
Review fund choices annually — high expense ratios can cost $100k+ over a career
The 4% rule estimates safe withdrawal — divide your goal income by 4% to find your target balance
A 401(k) plan is the most powerful tax-advantaged retirement savings vehicle available to American workers, offering immediate tax deductions, tax-deferred growth, and often free money through employer matching contributions. For 2026, employees can contribute up to $23,000 ($30,500 if age 50 or older), with a combined employer-employee limit of $69,000. The tax benefits are substantial — a $23,000 contribution in the 24% bracket saves $5,520 in federal taxes immediately, while the investment grows tax-free until withdrawal. Employer matches amplify returns dramatically: a 50% match on the first 6% of salary is essentially a 50% instant return on that portion. Our 401(k) calculator projects your retirement balance based on current age, salary, contribution rate, employer match, expected returns, and time horizon. It models the impact of increasing contributions, compares traditional vs Roth 401(k) options, and shows how early contributions compound exponentially — a $10,000 annual contribution starting at age 25 grows to approximately $1.4 million by age 65 at 7% returns, while starting at 35 yields only $660,000.
Three forces compound to grow your 401(k):
The earlier you start, the more time those returns have to compound.
Even small percentage increases — bumping your contribution from 6% to 8% — can add hundreds of thousands of dollars over a 30+ year career.
The choice between Roth and Traditional comes down to your current vs future tax bracket.
Traditional reduces taxable income today (good for high earners now), but you pay tax on every dollar withdrawn in retirement.
Roth gives no upfront break, but every dollar of growth is tax-free forever — great if you expect to be in the same or higher bracket later, or if you value tax certainty.
Many savers split contributions between both.
The IRS sets an annual 401(k) employee contribution limit that it adjusts for inflation — $23,500 for 2025 — with an additional catch-up contribution (an extra $7,500 at age 50+).
Employer matching does not count toward the employee limit; the combined employee-plus-employer cap is much higher ($70,000 for 2025).
Contributing at least enough to capture the full employer match should be the first priority, since the match is an immediate, guaranteed return on your money.
A 401(k) grows from your contributions, the employer match, and compound investment returns.
If you earn $80,000 and contribute 6% ($4,800) with a 50%-up-to-6% employer match ($2,400), that is $7,200 invested per year. At a 7% average annual return over 30 years, those contributions grow to roughly $680,118 — far more than the $216,000 contributed, thanks to compounding.
This calculator projects that growth from your salary, contribution rate, match, and expected return.
The employer match is the highest-return feature of a 401(k) — a common formula is 50% of contributions up to 6% of salary, effectively a 50% instant return on that money.
The U.S. Department of Labor calls unclaimed match 'leaving money on the table.'
Always contribute at least enough to get the full match before directing savings elsewhere. Failing to do so is the single most common and costly 401(k) mistake.
A traditional 401(k) uses pre-tax contributions — lowering taxable income now — and taxes withdrawals in retirement. A Roth 401(k) uses after-tax money now but grows and is withdrawn tax-free. The IRS allows both, and many plans offer each.
Traditional favors those who expect a lower tax rate in retirement; Roth favors those expecting a higher future rate or wanting tax-free retirement income.
Some savers split contributions between the two to hedge.
Your own contributions are always 100% yours, but the employer match may 'vest' over time.
Under a cliff schedule you own the full match only after a set number of years; under graded vesting you own an increasing percentage each year. The Department of Labor sets maximum vesting periods.
If you leave before fully vested, you forfeit the unvested match — worth checking before changing jobs.
Withdrawing from a 401(k) before age 59½ generally triggers a 10% IRS penalty plus ordinary income tax, sharply reducing the amount and sacrificing future compounding. Exceptions exist (certain hardships, the rule of 55).
Loans against a 401(k) avoid the penalty but must be repaid, and become taxable if you leave your job with a balance.
Treat the 401(k) as untouchable until retirement to preserve its tax advantage and growth.
Traditional 401(k)s require you to begin taking Required Minimum Distributions once you reach the RMD age (73 under current law), because the IRS eventually wants the deferred tax. RMDs are calculated from your balance and life expectancy.
Roth 401(k)s are no longer subject to RMDs during the owner's lifetime under recent law.
Missing an RMD carries a steep penalty, so plan withdrawals as you approach the threshold.
When leaving a job you can:
A direct (trustee-to-trustee) rollover avoids taxes and penalties; cashing out triggers both.
The Department of Labor warns that cashing out a 401(k) at job change is a major setback to retirement savings. Roll over rather than withdraw.
The costliest mistakes are:
Savers also forget to increase contributions after raises.
Capture the match, keep costs low, stay invested, roll over instead of cashing out, and raise your contribution rate over time.
Data sourced from trusted institutions
All formulas verified against official standards.