401(k) Calculator

What Is a 401(k) Calculator?

A 401(k) calculator helps you estimate how much money you could save for retirement through your workplace retirement plan. It considers your current savings, salary, contributions, employer matching contributions, investment returns, and years until retirement.

The CalcifyAI 401(k) Calculator also helps you estimate early withdrawal costs and find how much you should contribute to receive your employer's maximum matching contribution.

You can use three calculation options:

• 401(k) Projection: Estimate your retirement balance, investment growth, and potential retirement income.

• 401(k) Early Withdrawal Costs: Estimate taxes, possible penalties, and the amount you may receive after withdrawing money.

• Maximize Employer Match: Calculate the contribution percentage needed to receive your employer's maximum available match.

How to Use the 401(k) Calculator

Choose the calculation option that matches your goal.

1. Calculate Your 401(k) Retirement Savings

Select 401(k) Projection and enter the following information:

1. Current Age: Enter your age.

2. Current Salary: Enter your annual salary before taxes.

3. Current 401(k) Balance: Enter the amount already saved in your retirement account.

4. Your Contribution (% of Salary): Enter the percentage of your salary you contribute.

5. Employer Match: Enter your employer's matching percentage.

6. Employer Match Limit (% of Salary): Enter the maximum salary percentage eligible for matching.

7. Expected Retirement Age: Enter the age when you plan to retire.

8. Life Expectancy: Enter your estimated planning age.

9. Expected Salary Increase: Enter your estimated annual salary growth.

10. Expected Annual Return: Enter the investment return you want to assume.

11. Expected Inflation Rate: Enter your estimated annual inflation rate.

Under the additional settings, you can select the tax year, enter prior-year FICA wages, specify an optional plan contribution limit, and adjust catch-up contribution settings.

You can also enter an Annual Withdrawal Planning Assumption to estimate potential retirement income.

Click Calculate to view your projected retirement balance.

2. Calculate 401(k) Early Withdrawal Costs

Select 401(k) Early Withdrawal Costs and enter:

1. Withdrawal Amount: The total amount you plan to withdraw.

2. Federal Income Tax Rate: Your estimated federal tax rate.

3. State Income Tax Rate: Your estimated state tax rate.

4. Local / City Income Tax Rate: Any applicable local income tax rate.

5. Participant Age: Your age at withdrawal.

6. Account Type: Select the applicable 401(k) account type.

7. Taxable Portion of Gross Withdrawal: Enter the amount subject to income tax.

You can also provide employment information and select any applicable early withdrawal penalty exemptions.

Click Calculate to estimate your taxes, possible early withdrawal penalty, and net withdrawal amount.

3. Maximize Your Employer 401(k) Match

Select Maximize Employer Match and enter:

1. Your age.

2. Your annual salary.

3. Your employer's first matching percentage.

4. The first-tier salary contribution threshold.

5. Your employer's second matching percentage, if applicable.

6. The second-tier cumulative salary contribution threshold.

You can also adjust the tax year, prior-year wages, optional plan contribution limit, and catch-up contribution settings.

Click Calculate to see the recommended contribution percentage, your annual contribution, and the estimated employer match.

How Is a 401(k) Calculated?

Your future 401(k) balance depends on your existing savings, ongoing contributions, employer matching contributions, and investment growth.

Employee Contribution Formula

$\text{Annual Contribution}=\text{Annual Salary}\times\frac{\text{Contribution Percentage}}{100}$

For example, if your annual salary is $75,000 and you contribute 10%:

$75{,}000 \times \frac{10}{100} = \$7{,}500$

Your annual employee contribution is $7,500, before applying any relevant contribution limits.

401(k) Future Value Formula

For a simplified calculation with a fixed annual contribution made at the end of each year:

$FV=P(1+r)^n+C\times\frac{(1+r)^n-1}{r}$

Where:

• (FV) = Future retirement balance

• (P) = Current 401(k) balance

• (C) = Total annual contributions

• (r) = Expected annual investment return as a decimal

• (n) = Number of years until retirement

If the expected return is zero:

$FV=P+Cn$

The calculator's actual projection also considers changing salaries, employer contributions, applicable contribution limits, and other selected assumptions.

Inflation-Adjusted Retirement Balance

A future retirement balance may have less purchasing power because of inflation.

$PV=\frac{FV}{(1+i)^n}$

Where (i) is the expected annual inflation rate and (n) is the number of years until retirement.

This helps you compare your projected future savings with their estimated value in today's dollars.

401(k) Calculation Example

Suppose you have:

Your first-year employee contribution would be:

$75{,}000 \times 0.10 = \$7{,}500$

If your employer matches 50% of contributions on the first 3% of salary, the first-year employer contribution would be:

$75{,}000 \times 0.03 \times 0.50 = \$1{,}125$

Your combined first-year contribution would be:

$7{,}500 + 1{,}125 = \$8{,}625$

Your final projected balance will depend on salary growth, investment returns, contribution limits, and the timing of deposits. Enter the complete information into the calculator to see the estimate.

Understanding Your 401(k) Results

The projection calculator provides several retirement planning estimates.

You can also review the 401(k) Balance Growth Projection, Contribution Breakdown, Gross Withdrawal Planning Comparison, and Retirement Timeline.

These results are projections. Actual investment performance, contribution limits, employer plan rules, and retirement income may differ.

401(k) Contribution Limits for 2026

The IRS limits how much employees can contribute to most traditional and Roth 401(k) plans each year.

For 2026, the regular combined employee-and-employer annual additions limit is generally $72,000, excluding eligible catch-up contributions. Other compensation and plan restrictions may apply.

Some plans allow additional catch-up contributions for eligible participants. Starting in 2026, certain higher earners must make eligible catch-up contributions on a Roth basis.

Your employer's plan may also set a lower contribution limit than the IRS maximum.

For the latest rules, see the IRS 401(k) contribution limits.

How Does a 401(k) Employer Match Work?

An employer match is money your employer contributes to your retirement account based on your own contributions.

For example, your employer might match 50% of your contributions on the first 6% of your salary.

If you earn $75,000 annually and contribute 6%:

$75{,}000 \times 0.06 = \$4{,}500$

Your employer would contribute:

$4{,}500 \times 0.50 = \$2{,}250$

Your combined annual contribution would be $6,750.

Some employers use multiple matching tiers. The Maximize Employer Match calculator helps you estimate the minimum contribution percentage needed to receive the full available match under your selected plan rules.

Employer contributions may be subject to vesting schedules, plan limits, and other requirements.

How Much Does an Early 401(k) Withdrawal Cost?

Taking money from your 401(k) before retirement may result in income taxes and an additional early withdrawal tax.

In general, taxable withdrawals made before age 59½ may be subject to an additional 10% federal tax unless an exception applies.

Early Withdrawal Calculation Formula

$\text{Estimated Income Taxes}=\text{Taxable Amount}\times\text{Combined Estimated Tax Rate}$

$\text{Early Withdrawal Penalty}=\text{Taxable Amount}\times0.10$

The second formula applies only when the additional 10% tax is required.

$\text{Net Withdrawal}=\text{Gross Withdrawal}-\text{Estimated Income Taxes}-\text{Penalty}$

Example: Withdraw $10,000 From a 401(k)

Assume:

• Gross withdrawal: $10,000

• Taxable portion: $10,000

• Federal income tax rate: 25%

• State income tax rate: 5%

• Local income tax rate: 0%

• Additional early withdrawal tax: 10%

Estimated federal tax:

$10{,}000 \times 0.25 = \$2{,}500$

Estimated state tax:

$10{,}000 \times 0.05 = \$500$

Estimated early withdrawal penalty:

$10{,}000 \times 0.10 = \$1{,}000$

Estimated net withdrawal:

$10{,}000 - 2{,}500 - 500 - 1{,}000 = \$6{,}000$

You would receive an estimated $6,000 after taxes and the additional penalty under these assumptions.

A qualifying exemption could eliminate the additional 10% tax, but regular income taxes may still apply.

Simply being unemployed does not automatically remove the early withdrawal penalty. Traditional and Roth 401(k) withdrawals can also have different tax treatment.

For details, see the IRS early distribution exceptions.

How Much Should You Contribute to Your 401(k)?

Your contribution percentage depends on your income, financial goals, retirement timeline, and employer matching rules.

A practical starting point is to check how much you need to contribute to receive your employer's full available match.

For example, if your employer matches contributions up to 6% of your salary, contributing less than 6% may mean receiving less than the maximum available match.

After that, consider whether you can increase your contribution while covering essential expenses, maintaining emergency savings, and managing debt.

You can also use the Retirement Calculator to explore your broader retirement savings goals.

Disclaimer: This calculator provides educational estimates and is not personalized financial or tax advice. IRS rules, employer plan provisions, and tax treatment may affect your actual results. Consult your plan administrator or a qualified professional for decisions involving retirement contributions or withdrawals.