401(k) Contribution Calculator

See exactly how your 401(k) contributions affect your take-home pay. This calculator breaks down the real cost of saving for retirement by showing your paycheck with and without contributions, the total tax savings from pre-tax deferrals, and the value of your employer match. Find the perfect contribution rate to balance your current budget with your long-term retirement goals.

This tool is for anyone with a workplace retirement plan who wants to understand the immediate financial impact of their savings choices. Whether you're just starting a new job or looking to optimize your current savings, this calculator provides clarity. For a broader view of your retirement trajectory, use the main 401(k) calculator or the comprehensive retirement calculator. If you have a Roth 401(k) option, compare outcomes with the Roth 401(k) calculator.

The calculator provides a detailed breakdown of your annual savings, including your contributions, your employer's match, and your tax savings. You'll see a score that rates your contribution strategy, a table comparing different savings rates, and charts that project your 401(k) growth and track your progress toward the annual contribution limit.

Start by entering your financial details in the "Income & Tax" section. Provide your annual salary, pay frequency (how often you get paid), your current age, federal tax filing status, and your state's income tax rate. Your age is important for determining eligibility for catch-up contributions.

Next, in the "Your Contribution" section, enter the percentage of your salary you want to contribute. Then, select your account type: Traditional (pre-tax) or Roth (after-tax). This choice significantly impacts your tax savings now versus in retirement. For a detailed comparison, see our guide on Roth vs. Traditional IRAs, as the principles are similar for 401(k)s.

Then, configure your "Employer Match." Select the formula your employer uses—this is a critical step to see how much "free money" you might be leaving on the table. Common formulas include a percentage of your contribution up to a certain limit (e.g., 50% of the first 6%) or a dollar-for-dollar match. If you are a federal employee, your plan works differently; use the TSP match calculator for specific details.

For a more detailed projection, open the "Advanced Settings." Here you can add your current 401(k) balance, your expected annual investment return, and the number of years until you plan to retire. You can also input other pre-tax deductions like health insurance or HSA contributions to refine the paycheck calculation. Once all inputs are set, click "Calculate" to see your results.

Income & Tax Details

This section establishes the baseline for all calculations.

• Annual Salary: Your gross salary before any taxes or deductions are taken out. This is used to calculate your contribution amount and potential employer match.
• Pay Frequency: How often you are paid (biweekly, semi-monthly, or monthly). This determines your gross pay per paycheck and how contributions are spread throughout the year.
• Age: Your current age is used to determine if you are eligible for catch-up contributions. For 2026, savers age 50 and over can contribute an extra $7,500. Those aged 60-63 can contribute an additional "super catch-up" of $11,250.
• Filing Status & State Tax Rate: These are used to estimate your federal and state income taxes. The calculator uses this to show how pre-tax 401(k) contributions can lower your taxable income and create tax savings.

Your Contribution Rate & Type

This is the core of your savings strategy.

• Contribution Rate: The percentage of your gross salary you choose to save in your 401(k) each pay period. Even a 1% increase can make a huge difference over time due to compounding.
• Account Type: Choose between a Traditional 401(k) (pre-tax) or a Roth 401(k) (after-tax). Traditional contributions reduce your taxable income now, resulting in immediate tax savings. Roth contributions are made with money that has already been taxed, meaning withdrawals in retirement are tax-free. Use the Roth 401(k) calculator to model this choice in more detail.

Employer Match Formula

Your employer match is one of the best returns on investment you can get.

• Match Formula: This defines how your employer contributes to your account. The most common is "% of Your %," where they match a percentage (e.g., 50%) of your contributions up to a certain limit (e.g., 6% of your salary). "Dollar-for-Dollar" is a 100% match up to a limit. "Flat Amount" is a fixed contribution from your employer, regardless of what you contribute. Always contribute at least enough to get the full match.

Growth & Projections (Advanced)

These optional inputs provide a long-term view of your savings.

• Current 401(k) Balance: The total amount you already have saved in your 401(k).
• Expected Annual Return: The average annual growth rate you expect from your investments. A common long-term estimate for a diversified stock portfolio is 6-8%, but this is not guaranteed.
• Years to Retirement: The number of years you plan to continue working and contributing. This sets the timeline for your investment growth projection. The retirement age calculator can help you explore different timelines.

Other Deductions (Advanced)

These inputs help create a more accurate estimate of your take-home pay.

• Other Pre-Tax Deductions: Include annual costs for things like health, dental, or vision insurance premiums that are deducted from your paycheck pre-tax.
• HSA Contribution: Enter your annual Health Savings Account contribution. Like a Traditional 401(k), HSA contributions are pre-tax and reduce your taxable income.

This calculator models your paycheck and 401(k) savings on a per-pay-period and annual basis.

First, it determines your gross income per paycheck based on your annual salary and pay frequency. From there, it calculates your 401(k) contribution for each pay period based on your chosen contribution rate.

Next, it calculates the employer match you'd receive based on your contribution and the match formula you selected. It ensures the total of your contribution and the match does not exceed the annual IRS limits.

The core of the calculator is the tax analysis. It calculates your estimated federal and state taxes twice: once without your 401(k) contribution and once with it. For Traditional 401(k) contributions, your taxable income is reduced, which lowers your tax bill. The difference between these two tax amounts is your "Annual Tax Savings." For Roth contributions, there is no immediate tax deduction, so the tax savings are zero.

Finally, it calculates your take-home pay by subtracting taxes, your 401(k) contribution, and any other deductions from your gross pay. The "Paycheck Reduction" is the total change in your take-home pay, while the "Real Cost" shows this reduction minus any tax savings, revealing the true out-of-pocket cost of your contribution. The long-term projection uses a standard future value formula to estimate the growth of your current balance and future contributions over time.

The calculator uses a series of formulas to determine your paycheck impact, tax savings, and future growth. The key calculations are shown below.

Employee Contribution

This formula calculates your total annual contribution based on your salary and rate, while respecting IRS limits.

catch_up_amount = if age is 60-63 then 11250, if age >= 50 then 7500, else 0
employee_limit = 23500 + catch_up_amount
annual_contribution = min(annual_salary x (contribution_rate / 100), employee_limit)

Employer Match

The match calculation depends on the formula selected. Here is the logic for the most common type, "Percent of Percent."

matchable_contribution_rate = min(contribution_rate, match_up_to_percent)
annual_match = annual_salary x (matchable_contribution_rate / 100) x (match_rate / 100)

Tax Savings (for Traditional 401k)

Tax savings are found by comparing your tax bill with and without the pre-tax contribution.

taxable_income_without_401k = annual_salary - standard_deduction - other_deductions
tax_bill_without_401k = calculate_federal_and_state_tax(taxable_income_without_401k)

taxable_income_with_401k = annual_salary - annual_contribution - standard_deduction - other_deductions
tax_bill_with_401k = calculate_federal_and_state_tax(taxable_income_with_401k)

annual_tax_savings = tax_bill_without_401k - tax_bill_with_401k

Paycheck Impact

This shows the change in your take-home pay.

pay_periods = 26 for biweekly, 24 for semi-monthly, 12 for monthly
contribution_per_paycheck = annual_contribution / pay_periods
tax_savings_per_paycheck = annual_tax_savings / pay_periods

paycheck_reduction = contribution_per_paycheck
real_cost_per_paycheck = contribution_per_paycheck - tax_savings_per_paycheck

Future Value Projection

This estimates the long-term growth of your 401(k) savings.

monthly_return_rate = expected_annual_return / 12 / 100
total_months = years_to_retirement x 12
total_annual_contribution = annual_contribution + annual_match

fv_of_current_balance = current_balance x (1 + monthly_return_rate) ^ total_months
fv_of_future_contributions = (total_annual_contribution / 12) x ( ((1 + monthly_return_rate) ^ total_months - 1) / monthly_return_rate )

projected_future_value = fv_of_current_balance + fv_of_future_contributions

Deciding how much to contribute is a personal decision, but here are some proven strategies to guide you.

1. At Least Enough for the Full Employer Match: This is the absolute minimum you should aim for. An employer match is essentially a 50% or 100% risk-free return on your investment. For example, if your employer matches 100% of the first 5% you contribute, you should contribute at least 5% of your salary. Not doing so is like turning down a pay raise.

2. Follow the 15% Rule: Many financial experts recommend saving at least 15% of your pre-tax income for retirement. This includes your contribution and your employer's match. For example, if you contribute 9% and your employer matches 6%, you've hit the 15% target. This savings rate puts most people on a solid track for a comfortable retirement. To see how this rate impacts your overall plan, use the main retirement savings calculator.

3. Aim to Max Out: The ultimate goal for high earners or those playing catch-up is to contribute the maximum amount allowed by the IRS each year. For 2026, this is $23,500 for those under 50. Maxing out your 401(k) is one of the most powerful ways to build wealth, thanks to tax advantages and compound growth. See our guide on how much to save for retirement each month for more benchmarks.

4. Work Backward From Your Goal: Use a comprehensive retirement calculator to determine how much you need to retire. Once you have a target number, you can work backward to figure out the annual or monthly savings rate required to get there.

The IRS sets annual limits on how much you can contribute to a 401(k) and other defined contribution plans. For 2026, the limits are:

• Employee Contribution Limit: You can contribute up to $23,500 of your salary. This is also known as the elective deferral limit.
• Catch-Up Contribution (Age 50+): If you are age 50 or over at any point during the year, you can contribute an additional $7,500, bringing your total employee contribution limit to $31,000.
• Super Catch-Up Contribution (Ages 60-63): Thanks to the SECURE 2.0 Act, individuals aged 60, 61, 62, and 63 can make an even larger catch-up contribution. For 2026, this "super catch-up" is $11,250, bringing their total employee contribution limit to $34,750.
• Total Contribution Limit: The limit for all contributions—including your own, your employer's match, and any other employer contributions—is $70,000. This is also known as the 415(c) limit.

These limits apply to 401(k), 403(b), and the federal government's Thrift Savings Plan (TSP). Note that while 457(b) plans share the same base deferral limit, the SECURE 2.0 super catch-up contribution for ages 60-63 does not apply to 457(b) plans.

Many employers now offer both a Traditional and a Roth 401(k) option. Understanding the difference is key to tax planning.

Traditional (Pre-tax) 401(k):

• Contributions: Made with pre-tax dollars, which reduces your current taxable income.
• Tax Impact Now: You get an immediate tax break. If you're in the 22% tax bracket, every $1,000 you contribute saves you $220 in federal taxes today.
• Withdrawals in Retirement: All withdrawals—both your contributions and their earnings—are taxed as ordinary income.
• Best For: People who believe they will be in a lower tax bracket in retirement than they are today, or those who want to maximize their tax savings now to free up cash flow.

Roth (After-tax) 401(k):

• Contributions: Made with after-tax dollars. There is no upfront tax deduction.
• Tax Impact Now: Your take-home pay will be lower compared to contributing the same amount to a Traditional 401(k).
• Withdrawals in Retirement: All qualified withdrawals—both your contributions and all their earnings—are completely tax-free.
• Best For: People who believe they will be in a higher tax bracket in retirement, or those who want tax diversification and the certainty of tax-free income later in life.

You can compare both scenarios with our dedicated Roth 401(k) calculator. Also, note that any employer match you receive is always made on a pre-tax basis, even if your contributions are to a Roth 401(k).

• 401(k) Contribution Score: This gives you a quick assessment of your strategy. A high score indicates you are capturing the full employer match and saving at a healthy rate. A lower score suggests you may be leaving free money on the table.
• Paycheck Reduction vs. Real Cost: This is the most powerful result. "Paycheck Reduction" is the gross amount your take-home pay decreases. "Real Cost After Tax" is what you actually feel, because it accounts for the tax savings from your contribution. For pre-tax contributions, the real cost is always lower than the contribution amount.
• Annual Tax Savings: The total amount you save on federal and state income taxes for the year by making pre-tax contributions. This is a direct benefit of using a Traditional 401(k).
• Projected at Retirement: This shows the long-term power of your contributions, estimating how much your 401(k) could be worth by the time you retire based on your inputs. Check how long your savings might last with our guide on how long $1 million will last in retirement.
• Contribution Rate Comparison: This table is your decision-making tool. It shows how different savings rates impact your paycheck, tax savings, employer match, and total annual savings, helping you find the sweet spot.
• Charts: The visual charts help you understand where your money is going. You can see the total value of your contributions plus the match, track your progress toward the annual limit, and see a breakdown of your contribution, match, and tax savings.

If your contribution score is low or you want to boost your savings, here are actionable steps:

1. Capture the Full Employer Match: This is non-negotiable. Find out your employer's match formula and contribute at least enough to get every penny. It's the highest guaranteed return on your money.
2. Increase Your Rate by 1%: If a large increase feels daunting, commit to increasing your contribution rate by just 1%. The impact on your paycheck will be small, but the long-term effect on your retirement balance will be significant.
3. Automate Your Increases: Many 401(k) plans offer an "auto-escalation" feature that automatically increases your contribution rate by 1% each year. This puts your savings on autopilot.
4. Dedicate Raises and Bonuses: Whenever you get a pay raise or a bonus, allocate a portion or all of the increase directly to your 401(k) contribution rate. You won't miss the money since it wasn't part of your previous budget.
5. Aim to Max Out: If your budget allows, work toward contributing the annual maximum allowed by the IRS. This is the fastest way to accelerate your retirement savings. If you feel you're behind, read our guide on whether it's too late to save for retirement.

1. Not getting the full employer match. This is the most common and costly 401(k) mistake. You are turning down free money.
2. Setting it and forgetting it. Your savings rate should grow as your income grows. A 6% contribution might be great for a 25-year-old, but a 45-year-old should be saving more.
3. Cashing out when changing jobs. Never cash out your 401(k). Always roll it over to an IRA or your new employer's plan to avoid taxes and a 10% early withdrawal penalty. Use the 401(k) early withdrawal penalty calculator to see the cost.
4. Ignoring high fees. Pay attention to the expense ratios of the funds in your 401(k). High fees can significantly erode your returns over time.
5. Borrowing from your 401(k). While a 401(k) loan can seem tempting, it can derail your retirement savings by taking money out of the market and potentially creating tax problems if you leave your job.