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): your contributions, your employer's match (essentially free money), and investment returns over decades. 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.
Data sourced from trusted institutions
All formulas verified against official standards.