401(k) Calculator: Employer Match & Retirement Balance

For long-term planning, a 401(k) projection works best when it separates what you already have, what you may contribute, what an employer may add and how much investment growth could do over time. Current 2026 contribution limits also prevent an aggressive contribution rate from silently producing an impossible employee deferral.

How to Use the 401(k) Calculator

Enter your age, retirement age, current salary, 401(k) balance and employee contribution rate. Add the employer’s matching formula exactly as the plan describes it whenever possible.

• Your contribution: Percentage of salary you plan to defer into the 401(k).
• Employer match: Percentage of your eligible contribution the employer matches.
• Employer match limit: Maximum percentage of salary eligible for the match.
• Current balance: Money already in the 401(k), which remains separate from future employee and employer contributions in the breakdown.

Under a 50% match up to 6% of salary, the employer contributes 50 cents for each eligible dollar you contribute, while employee contributions above 6% receive no additional match under that formula. Actual plans can use more complicated formulas, true-up provisions or multiple match tiers, so the entered rule is a simplified annual model.

Projection assumptions show investment return, annual fees, inflation and salary growth above inflation directly in the calculator. Results are shown in today’s dollars so the ending balance is easier to interpret in current purchasing-power terms.

How the Projection Handles Growth, Fees and Inflation

Investment return is reduced by the annual fee assumption and then adjusted for inflation. After fees and inflation are applied, the real return is converted to a monthly rate and contributions are modeled at the end of each month rather than as one large deposit at the beginning of the year.

Fees matter because many 401(k) investment and administrative costs reduce the account’s investment return. Recurring plan and investment fees can have a substantial cumulative effect on retirement savings over long periods.

Salary is also expressed in today’s dollars. With salary growth above inflation set to 0%, pay maintains the same purchasing power over time; a positive value models real wage growth. Employee contributions and employer matching amounts then change with that real salary path until IRS contribution limits restrict them.

2026 401(k) Contribution Limits

For 2026, the basic 401(k) elective-deferral limit is $24,500. Participants age 50 or older can generally make an additional $8,000 catch-up contribution when the plan permits it, bringing the employee total to $32,500.

Workers who turn 60, 61, 62 or 63 during the calendar year qualify for a higher catch-up limit when the plan permits it. For 2026, that catch-up amount is $11,250, so the potential employee contribution reaches $35,750 for those ages. Projection years at ages 60 through 63 use the higher amount rather than treating every participant over 50 the same.

Matching dollars from the employer do not use the employee elective-deferral limit, but regular employee deferrals and employer contributions are subject to the broader annual-additions limit. For 2026, annual additions generally cannot exceed the lesser of 100% of compensation or $72,000, excluding eligible catch-up contributions.

Future IRS limits are not known today. Because the calculator reports everything in today’s dollars, it holds the 2026 statutory dollar limits constant in real terms as a planning approximation. Actual future limits will depend on inflation adjustments and future law.

Starting in 2026, certain higher-paid participants who make catch-up contributions must make those catch-up contributions on a Roth basis when the plan offers the required Roth feature. For 2026, the Roth catch-up wage threshold uses prior-year FICA wages above $150,000 from the sponsoring employer. Roth catch-up treatment changes the tax character of those contributions rather than the dollar-growth calculation, so it does not alter the projected balance.

What the Results Tell You

Projected 401(k) balance is the estimated account value at retirement in today’s dollars. Contribution breakdown separates starting balance, future employee contributions, future employer contributions and estimated investment growth so every component of the ending balance is visible.

Match impact at retirement answers a different question. To isolate the match effect, the calculator reruns the same scenario with employer matching set to zero and compares the two ending balances. Both employer contributions and the investment growth they may earn are included in that difference.

Match-capture percentage compares the current modeled employer contribution with the maximum employer contribution available under the entered formula and applicable 2026 employee limits. Anything below 100% signals that the current employee contribution does not capture all of the modeled match.

Current-year employee-limit headroom focuses on the amount still available under the applicable 2026 employee limit. It shows how much room remains under the age-based 2026 employee contribution limit or states that the modeled employee deferral has reached the applicable limit.

Plan Rules the Calculator Cannot Fully Model

Matching formulas can be more complicated than a single rate and salary cap. Some plans use multiple tiers, match each paycheck separately or provide a year-end true-up. Simplified annual matching can differ from the amount an employee actually receives.

Vesting also matters. Employee contributions are always fully vested, while employer matching contributions can be subject to a vesting schedule unless the plan rules provide immediate vesting. Matching contributions are assumed to remain in the account throughout the projection.

Highly compensated employees can face additional plan-specific contribution restrictions, and the definition of compensation used for matching may differ from gross salary. Plan documents and the summary plan description remain the best sources for the exact matching and contribution rules.

Investment returns are uncertain. Constant-return modeling does not capture market volatility or the order of gains and losses, and higher expected returns generally involve higher risk. Running conservative and higher-return scenarios is more useful than relying on a single optimistic forecast.

Broader retirement readiness requires more than one 401(k) account. Social Security, pensions, IRAs, taxable investments and retirement spending belong in a full retirement plan rather than being compressed into this account-growth calculator.