401(k) Calculator (2026)
Estimate your 401(k) retirement balance with employee contributions, employer match and investment growth.
United States Calculator
Adjust Your Inputs
Move the sliders or type exact numbers. Results update instantly.
Instant Estimate
Your Results
Estimated 401(k) Balance
$932,624
Based on your selected 401(k) calculator assumptions. Try different sliders to compare scenarios.
Employee Contributions
$225,000
Employer Match
$90,000
Investment Growth
$592,624
These are planning estimates, not tax, legal or investment advice. Country rules, lender policies and tax rates can change.
How to Use the 401(k) Calculator
Enter your current balance & salary
Start with your current 401(k) balance and your expected annual base compensation.
Specify your contribution rate
Input what percentage of your salary you defer each pay period (up to the IRS 2026 elective deferral limit of $23,500).
Add employer match formula
Include your company 401(k) matching percentage (e.g., 50% match up to 6% of salary) to calculate free employer contributions.
Set investment timeline & return
Project your balance over your retirement horizon using historical market return assumptions (typically 7-10% pre-inflation).
Formula & Calculation Methodology
Future Value = Contributions + Employer Match + Investment GrowthThis calculator uses standard United States financial formulas, IRS thresholds, and amortization schedules. All results compute instantly in your browser with zero data stored or transmitted.
Calculation Examples & Scenarios
Starting Early (Age 25)
$85,000 salary, 10% employee contribution ($8,500/yr), 4% employer match ($3,400/yr), 7% annual return over 35 years.
Mid-Career Catch-Up (Age 45)
$120,000 salary, $150,000 existing balance, 15% contribution + 5% match, 7% return over 20 years.
Maximizing the Match Only
$70,000 salary, 5% contribution with 100% match up to 5% ($3,500 employee + $3,500 employer), 8% return over 30 years.
Key Benefits
- Capture 100% of your employer match (guaranteed instant return)
- Lower your current year taxable income with pre-tax deferrals
- Compound interest growth with deferred tax liability until retirement
- Automate consistent investing through direct payroll deductions
Common Use Cases
- Evaluating whether to increase your contribution percentage before open enrollment
- Comparing job offers with different employer match vesting schedules
- Planning retirement age scenarios based on savings projections
- Deciding between Traditional 401(k) and Roth 401(k) allocations
Understanding 401(k) Contribution Limits & Rules (2026)
A 401(k) plan is the cornerstone of employer-sponsored retirement savings in the United States. For 2026, the IRS elective deferral limit allows employees to contribute up to $23,500 annually. Workers aged 50 and older can make additional catch-up contributions of $7,500, while those aged 60 to 63 can take advantage of the higher SECURE 2.0 catch-up limit of $11,250.
Total contributions from both employee and employer combined cannot exceed $70,000 (or $77,500 with standard age-50 catch-up). Contributing at least enough to capture your full company match should be your top financial priority, as it represents an immediate 50% to 100% return on your investment.
The Compounding Effect of Early Investing
Because 401(k) contributions grow tax-deferred, dividends and capital gains reinvest automatically without triggering annual capital gains taxes. Over 20 to 40 years, the vast majority of your final retirement wealth will come from compound growth rather than your original out-of-pocket contributions.
Even a 1% increase in your annual savings rate—such as stepping up from 6% to 7% of salary—can yield hundreds of thousands of dollars in extra retirement wealth thanks to decades of compounding.
Frequently Asked Questions
For 2026, the IRS elective employee deferral limit is $23,500. Workers aged 50 and older can contribute an additional $7,500 catch-up ($31,000 total), and those aged 60 to 63 qualify for a higher catch-up limit of $11,250 under SECURE 2.0.
Employers match a portion of your contributions, such as 50% of contributions up to 6% of your salary. This is free money and not subject to your individual $23,500 deferral cap, though combined employee + employer contributions are capped at $70,000 for 2026.
Historically, a diversified portfolio of 80% stocks and 20% bonds has returned an average of 7% to 9% annually before inflation. For conservative planning, many financial planners recommend using 6% to 7%.
Withdrawals before age 59½ typically incur regular income tax plus a 10% IRS early distribution penalty, unless you qualify for exceptions like the Rule of 55, permanent disability, or a 401(k) loan.
A Traditional 401(k) uses pre-tax contributions that reduce your taxable income today, and withdrawals in retirement are taxed as ordinary income. A Roth 401(k) is funded with after-tax dollars, but all qualified withdrawals in retirement are 100% tax-free.
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