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Calculate and analyze your financial information.
$1,896,708.37
At age 65
Your Contributions
$350,000.00
Employer Match
$150,000.00
Investment Growth
$1,396,708.37
Total Value
$1,896,708.37
Everything you need to know
A 401(k) is an employer-sponsored retirement savings plan that offers significant tax advantages and allows you to save for retirement through automatic payroll deductions. Named after the section of the Internal Revenue Code that created it, the 401(k) is one of the most popular retirement savings vehicles in the United States, with over 60 million participants managing more than $8 trillion in assets.
The 401(k) is powerful because it combines three wealth-building advantages: tax-deferred growth, employer matching contributions, and high contribution limits. For many workers, maximizing 401(k) contributions is the most effective way to build retirement wealth. The difference between starting 401(k) contributions at age 25 versus age 35 can amount to hundreds of thousands of dollars by retirement, even if total contributions are similar.
Understanding how 401(k)s work—particularly employer matching, contribution limits, and investment returns—is essential for retirement planning. This 401(k) calculator helps you model different contribution scenarios and see exactly how much you could accumulate by retirement.
Our 401(k) calculator makes it simple to project your retirement savings:
Your Profile
Income Information
Contribution Plan
Investment Returns
Review Results
FV = Starting Balance × (1 + r)^n + (Annual Contribution + Employer Match) × [((1 + r)^n - 1) / r]
Where:
Employer Match = Annual Salary × Match Percentage (up to contribution limit)
Common matching formulas:
Total Annual Savings = (Annual Salary × Your Contribution %) + (Annual Salary × Employer Match %)
Ending Balance = Beginning Balance × (1 + Annual Return)
Over multiple years with contributions, this compounds exponentially.
Scenario: James starts his first job at age 25, earning $45,000. His employer offers a 50% match on the first 6% of salary. He contributes 6% annually and expects 7% annual investment returns.
Calculations:
Year-by-year projections:
Key Insight: Starting early and capturing full employer match creates substantial wealth through compound growth.
Scenario: Sarah starts 401(k) contributions at age 35 with a $50,000 salary. Her employer offers 100% match up to 3% of salary. She contributes 10% annually (her decision to save aggressively).
Calculations:
Projected balances:
Comparison: Starting at 35 instead of 25 results in roughly $385,000 less at retirement (30% less wealth), showing the power of starting early.
Same scenario: $50,000 salary, 7% returns, 30 years to retirement
| Contribution | Employer Match | Total Annual Savings | Projected Balance at 65 |
|---|---|---|---|
| 3% ($1,500) | 3% ($1,500) | $3,000 | $445,000 |
| 6% ($3,000) | 3% ($1,500) | $4,500 | $660,000 |
| 10% ($5,000) | 3% ($1,500) | $6,500 | $895,000 |
| 15% ($7,500) | 3% ($1,500) | $9,000 | $1,220,000 |
Employer match provides $1,500 annually (regardless of your contribution level above 3%), equivalent to $445,000 by retirement at 7% returns.
Same scenario: $45,000 salary, $4,050 annual savings (6% + 50% match), 40 years
| Annual Return | Projected Balance |
|---|---|
| 5% | $650,000 |
| 6% | $850,000 |
| 7% | $1,280,000 |
| 8% | $1,880,000 |
| 9% | $2,750,000 |
A 2% difference in annual returns ($100,000+ annually in income by retirement) compounds to nearly $700,000 difference in final balance—demonstrating the importance of asset allocation and investment selection.
James from Example 1, but with annual salary increases
Assuming 3% annual salary increases and maintaining same 6% contribution rate:
| Year | Age | Salary | Annual Savings | Balance |
|---|---|---|---|---|
| 1 | 26 | $46,350 | $4,200 | $4,494 |
| 10 | 35 | $60,430 | $5,475 | $95,000 |
| 20 | 45 | $79,030 | $7,150 | $345,000 |
| 30 | 55 | $103,130 | $9,330 | $1,050,000 |
| 40 | 65 | $134,490 | $12,180 | $1,925,000 |
Key Insight: Annual salary increases compound your savings rate, creating even greater wealth accumulation than with flat salary.
Employer matching is "free money"—your company contributes to your 401(k) based on your contribution rate. Always contribute at least enough to capture the full match.
Example: If your employer offers a 50% match up to 6% of salary:
Vesting is when the employer match becomes fully yours. Some employers have immediate vesting (it's yours as soon as deposited), while others have a vesting schedule:
If you leave before vesting, you forfeit the unvested portion. Always check your plan's vesting schedule, as it affects your decision to stay with an employer.
Traditional 401(k): Contributions reduce taxable income today; you pay taxes on withdrawals in retirement. Taxes are typically lower if your retirement income is less than working income.
Roth 401(k): Contributions are after-tax (no current deduction), but withdrawals in retirement are tax-free. Better if you expect higher tax rates in retirement.
Starting at age 73 (after SECURE 2.0 Act), you must withdraw a minimum percentage of your 401(k) balance annually, calculated based on IRS tables. Failure to take RMDs results in a 25% penalty on the shortfall (reduced to 10% if corrected timely).
Some plans allow borrowing from your 401(k) (typically up to 50% of balance, max $50,000) or hardship withdrawals for qualified expenses. Both have drawbacks:
When changing jobs, you can roll your 401(k) into:
Rollovers preserve tax-deferred status and avoid the 10% early withdrawal penalty.
401(k) fees include:
This is the highest-priority goal. Contribute at least enough to get the full match—it's an immediate 50-100% return with zero investment risk.
Action: Check your plan documents for match details; contribute accordingly.
Your investment allocation should become more conservative as you approach retirement:
Target-date funds automatically shift from aggressive to conservative as your retirement date approaches. This "set and forget" approach works well for many investors.
Benefits: Rebalancing happens automatically; no need to monitor
Compare fund options in your plan and choose lower-cost versions:
Increase your contribution by 1-2% annually or with salary raises. Most people don't notice a 1% increase in paycheck deduction, but it compounds significantly over decades.
When you get a raise, contribute half of the increase to your 401(k). You maintain purchasing power while accelerating retirement savings.
Market volatility is normal. Stay invested during downturns—selling low locks in losses. 401(k)s benefit from dollar-cost averaging (contributing regularly regardless of market conditions).
A 401(k) is one of the most powerful retirement savings tools available, combining employer matching, tax advantages, and the power of compound growth. The key to maximizing your 401(k) is to start early, capture the full employer match, maintain a diversified investment allocation, and avoid the temptation to withdraw early.
This 401(k) calculator helps you visualize your potential retirement savings under different scenarios. Even small changes—increasing contributions by 1% annually or reducing fees by 0.5%—compound to significant differences over 30+ years. Use this calculator to set ambitious but realistic savings goals, then adjust your contributions to stay on track.
Remember: The best 401(k) strategy is the one you'll stick with. Start with capturing the full employer match, maintain consistent contributions throughout your career, and let compound growth work its magic over decades.
Disclaimer: This 401(k) calculator provides projections for educational purposes only and is not financial advice. Actual investment returns vary and are not guaranteed. Contribution limits, tax treatment, and plan rules change periodically per IRS regulations. Consult with a qualified financial advisor, tax professional, and your plan administrator to develop a comprehensive retirement strategy tailored to your specific situation, goals, and plan rules.