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Calculator Answers

401k Calculator

Source: IRS Notice 2025-67 for the 2026 section 402(g)(1) elective deferral limit, the age-50 and age-60-to-63 catch-up limits, the section 415(c) total and the section 401(a)(17) compensation limit · Source verified August 23, 2026

Blake Boege
Written by Blake Boege · Founder, Calculator Answers

A 401k calculator is a financial projection tool designed to estimate the future value of an employer-sponsored retirement account. The calculator computes the combined growth of pre-tax employee contributions, voluntary employer matching funds, and investment returns over time. It frequently incorporates variables like annual salary increases to simulate real-world compensation paths. Future retirees use it to analyze how different contribution rates and matching structures affect their long-term financial security.

Enter your current 401k balance, salary, contribution rate, employer match, annual return, salary growth, and years until retirement. The calculator projects year by year and estimates the final balance, total contributions, and investment growth.

See also: Roth IRA Calculator, Compound Interest Calculator, and Simple Interest Calculator.

Quick Answer

Estimate your future 401(k) balance with employer match, salary growth, and compound returns. Enter your salary, contribution rate, and years to retirement.

$

e.g. 25,000

$

e.g. 75,000

Contributions and employer match

%

Of salary. · e.g. 10

%

Of eligible contributions. · e.g. 50

%

Up to this % of salary. · e.g. 6

Growth assumptions

%

e.g. 7

%

e.g. 3

yr

e.g. 30

Estimated 401k balance

Estimated balance after 30 years

$1,454,148.32

Total contributions $463,860.30 · investment growth $965,288.01

First year employee contribution$7,500.00
First year employer match$2,250.00
First year total contribution$9,750.00
Match eligible rate6%
Effective contribution rate13%
Total employee contributions$356,815.62
Total employer match$107,044.69
Total contributions$463,860.30
Investment growth$965,288.01
Final year salary$176,742.41

Year-by-year (first three + final)

  • Year 1End balance $36,500.00
  • Year 2End balance $49,097.50
  • Year 3End balance $62,878.10
  • Year 30End balance $1,454,148.32

Estimate only. Real returns, fees, vesting, and timing can change the final number. No contribution cap is applied here: the 2026 elective deferral limit is $24,500 under IRS Notice 2025-67, and this projection will exceed it without saying so.

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Examples

$25k balance · 10% / 50% match (6% cap) · 7% · 3% · 30 yr

First year contribution $9,750 · final balance ≈ $1.45M

Same plan, 5% contribution (below match limit)

First year contribution $5,625 · captures full match band

Same plan, 0% employer match

First year contribution $7,500 · no match dollars added

How it works

Formula · Balance = prior balance x (1 + return) + salary x rate + salary x min(rate, match limit) x match rate, compounded annually. The projection arithmetic needs no source; the contribution limits do, and are re-set every year

The calculator runs a simple annual projection. Each year it applies the annual return to the starting balance, adds the employee contribution and any employer match, and then carries the new balance into the next year. Salary grows each year by the salary growth rate.

Employee contribution

employee = salary × contribution rate

Employer match

match = salary × min(contribution rate, match limit) × match rate

Yearly contribution

yearly contribution = employee + match

Projected balance

new balance = prior balance × (1 + annual return) + yearly contribution

This is a simplified annual projection. Real 401k plans can compound and receive contributions throughout the year, and actual returns vary by year.

What is a 401k calculator?

A 401k calculator estimates the future value of an employer-sponsored retirement account by projecting contributions and investment growth year by year. It is useful for setting a target contribution rate, checking whether you are on track for retirement, and comparing scenarios such as raising your contribution or capturing more of an employer match.

The 2026 contribution limits this calculator does not apply

This projection multiplies your salary by the percent you enter. It applies no cap, so the result changes with the limit and you have to apply the limit yourself. The figures below are for 2026 and come from IRS Notice 2025-67.

2026 elective deferral and catch-up limits from IRS Notice 2025-67
Limit2026 amountCode section
Elective deferral$24,500402(g)(1)
Catch-up, age 50 and over$8,000414(v)(2)(B)(i)
Catch-up, age 60 to 63$11,250414(v)(2)(E)(i)
Employee plus employer total$72,000415(c)(1)(A)
Compensation counted$360,000401(a)(17)

The two catch-up figures are alternatives, not additions. The $11,250 applies instead of the $8,000 if you attain age 60, 61, 62 or 63 during 2026, and it reverts to the ordinary catch-up in the year you turn 64.

One consequence that catches high earners: if your wages from the employer sponsoring the plan exceeded $150,000 in 2025, your catch-up contributions for 2026 must be designated Roth rather than pre-tax. That threshold is set under section 414(v)(7)(A) and is itself re-set each year.

Every figure on this page is indexed, meaning it is recalculated annually for cost of living. A contribution limit quoted without a year is not usable, which is why each one here carries 2026 and the notice that set it.

How the 401k calculator works

For each year of the projection, the calculator:

  • Applies the annual return to the starting balance.
  • Computes the employee contribution from salary and the contribution rate.
  • Computes the employer match using the match rate and the match limit (eligible rate = min(contribution rate, match limit)).
  • Adds the contributions to the balance.
  • Grows the salary for the next year by the salary growth rate.

The result includes the final balance, total employee contributions, total employer match, and the implied investment growth.

Employee contributions

Employee contributions are usually expressed as a percent of salary, so the dollar amount scales as you get raises. A $75,000 salary with a 10 percent contribution rate sends $7,500 into the plan in the first year. Contributions can be pre-tax (traditional 401k) or after-tax (Roth 401k), depending on the plan; the calculator handles only the balance projection, not the tax treatment.

Employer match

Many employers match part of what the employee puts in, up to a cap. A common pattern is 50 percent match up to 6 percent of salary. That means the match rate is 50 percent and the match limit is 6 percent. If the employee contributes 10 percent of salary, only the first 6 percent is eligible for the match. The match dollars are: salary times the eligible rate (6 percent in that case) times the match rate (50 percent).

Employer match rules vary widely. Some employers match 100 percent up to a low cap; some use a tiered formula; some do not match at all. Enter the rates that match your plan.

Annual return and compounding

Annual return is the assumed average growth rate of the investments inside the 401k. The calculator applies the return to the starting balance each year before adding the year's contributions. Compounding does the heavy lifting in long projections: even modest yearly returns build up over decades, which is why early contributions matter so much.

Real returns are not constant. Markets go up and down, and a single average is a planning estimate, not a forecast. Consider running scenarios at different return assumptions to see how sensitive the final balance is.

Salary growth

Salary growth raises the dollar amount of contributions each year because contributions are a percent of salary. Even a small annual raise compounds over a 30-year career. The default 3 percent is roughly long-run wage growth in the U.S.; raise or lower it to match your situation.

401k balance projection

The calculator carries balance and salary forward year by year. The annual sequence is: grow balance by return, add employee and match contributions, raise salary for the next year. The result panel shows the first three years and the final year so you can see how the balance scales. For comparing percentage scenarios in plain math, the percentage calculator and percentage increase calculator can help.

Worked example

Current 401k balance $25,000, annual salary $75,000, employee contribution 10 percent, employer match 50 percent, match limit 6 percent, annual return 7 percent, salary growth 3 percent, 30 years.

  • First year employee contribution: 75,000 × 10% = $7,500
  • First year employer match: 75,000 × 6% × 50% = $2,250
  • First year total contribution: $9,750
  • Final year salary (year 30): ≈ $176,742
  • Total employee contributions over 30 years: ≈ $356,816
  • Total employer match over 30 years: ≈ $107,045
  • Investment growth: ≈ $965,288
  • Estimated final 401k balance: ≈ $1,454,148

The calculator produces these same numbers for these inputs. The bulk of the final balance comes from investment growth, which is the practical reason starting early and capturing the full employer match matters so much.

Common mistakes

  • Leaving employer match on the table. If the match limit is 6 percent of salary and you contribute less than 6 percent, you are giving up matching dollars.
  • Confusing match rate and match limit. The rate is how much the employer adds (50 percent, 100 percent). The limit is the cap on the eligible contribution (6 percent of salary, for example).
  • Treating a single average return as a guarantee. Markets fluctuate; the average is only an estimate.
  • Forgetting that a 401k has annual contribution limits set by the IRS. For 2026 the elective deferral limit is $24,500 under IRS Notice 2025-67. This calculator does not enforce it, so a high contribution percent on a high salary will project a balance you could not legally reach.
  • Ignoring fees. Plan and fund fees compound against you the same way returns compound for you.

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Disclaimer. This calculator is an estimate for general planning. Actual 401k balances can vary based on market returns, fees, contribution limits, employer match rules, vesting, taxes, withdrawals, plan rules, and timing of contributions. It is not investment, tax, or retirement advice, and it does not guarantee any return.

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Frequently asked questions

A 401k calculator estimates the future balance of a 401k account by projecting year by year. Each year it adds employee contributions and any employer match, then applies the expected annual return. Salary can grow each year, which gradually raises the dollar amount of contributions. The result is an estimate based on the assumptions you provide.

Employee contribution dollars = salary × contribution rate. For example, a $75,000 salary with a 10% contribution rate puts $7,500 into the plan per year. Most calculators express the contribution as a percent of salary so the amount scales with raises.

Many employers match a portion of what the employee contributes, up to a cap. A common pattern is 50% match up to 6% of salary, which means the employer adds 50 cents for every dollar the employee contributes, but only on the first 6% of salary. If the employee contributes 10% of salary, the match only applies to the first 6%.

The match limit is the maximum percentage of salary the employer is willing to match. A 6% match limit means the employer only matches contributions up to 6% of salary. Anything the employee contributes above the limit is still pre-tax (or Roth) but it is not matched. Match limits and rates vary widely by employer.

Annual return is the average rate the investments in the 401k earn each year. A higher long-run return increases the final balance through compounding. Real returns are not constant; some years are higher, some are negative. A 401k projection that assumes a single average return is a planning estimate, not a forecast.

Salary growth raises the dollar amount of contributions each year because employee and employer match contributions are usually a percent of salary. Even a small annual raise compounds, so contributions in the final years are typically much larger than in the first year.

No, and here are the figures it is not applying. For 2026 the elective deferral limit under section 402(g)(1) is $24,500, set by IRS Notice 2025-67. If you are 50 or over you may add a catch-up of $8,000, and if you reach age 60, 61, 62 or 63 during 2026 the catch-up is $11,250 instead. This calculator multiplies your salary by the percent you enter and stops there, so if that product exceeds the limit the projection is higher than you could legally contribute. Check the dollar amount your percent produces in the first year and compare it against the limit yourself. These figures are re-set annually, so a limit quoted without a year is not usable.

No. A 401k is an employer-sponsored retirement plan with payroll contributions and often an employer match. A Roth IRA is an individual account funded with after-tax dollars. The two can be used together. The Roth IRA calculator projects after-tax retirement savings on the individual side.

No. The result is an estimate based on the assumptions you enter. Real investment returns vary, fees apply, salary growth changes, plan rules differ, contribution limits move over time, and life events affect contributions. Use the estimate for planning, not as a guarantee.

A yearly check-in is usually enough. Update sooner if your salary, contribution rate, or employer match changes, if your investment mix shifts, or if your target retirement timeline moves. Big changes in assumptions can move the projection a lot.