401(k) Calculator
Calculate your 401(k) retirement savings with employer matching contributions.
Your Information
Employer Match
Projected Balance at Retirement
$3,839,719
In 35 years
Contribution Breakdown
What is a 401(k)?
A 401(k) is an employer-sponsored retirement savings plan that offers significant tax advantages. Named after section 401(k) of the Internal Revenue Code, it's one of the most powerful wealth-building tools available to American workers.
Key 401(k) features:
- Tax-advantaged growth: Investments grow tax-deferred or tax-free
- Employer matching: Free money from your employer
- High contribution limits: Much higher than IRAs
- Automatic payroll deductions: Easy saving
- Creditor protection: Protected from bankruptcy
Types of 401(k) accounts:
- Traditional 401(k): Pre-tax contributions, taxed on withdrawal
- Roth 401(k): After-tax contributions, tax-free withdrawals
- Safe Harbor 401(k): Automatic employer contributions
- Solo 401(k): For self-employed individuals
2024 Contribution Limits
Employee contribution limits (2024):
- Under age 50: $23,000 per year
- Age 50 and over: $30,500 per year (includes $7,500 catch-up)
Total contribution limit (employee + employer):
- Under age 50: $69,000 per year
- Age 50 and over: $76,500 per year
Common employer match formulas:
- 100% match on first 3%, 50% on next 2% (effective 4%)
- 50% match on first 6% (effective 3%)
- Dollar-for-dollar match up to 4% (effective 4%)
- No match (still worth contributing for tax benefits)
Vesting schedules: Many employers require years of service before you own matched funds fully. Common schedules are 3-year cliff vesting or 6-year graded vesting.
401(k) Growth Formula
Where:
- FV= Future value at retirement
- PMT= Monthly contribution (including match)
- r= Monthly return rate
- n= Number of months to retirement
Traditional vs. Roth 401(k)
Traditional 401(k):
- Contributions reduce taxable income today
- Pay taxes on withdrawals in retirement
- Required Minimum Distributions (RMDs) at age 73
- Best if you expect lower tax bracket in retirement
Roth 401(k):
- Contributions made with after-tax dollars
- Withdrawals are 100% tax-free in retirement
- No RMDs starting 2024 (SECURE 2.0 Act)
- Best if you expect same or higher tax bracket in retirement
When to choose Traditional:
- Currently in high tax bracket (32%+)
- Expect lower income in retirement
- Need tax deduction to qualify for other benefits
When to choose Roth:
- Currently in lower tax bracket (22% or less)
- Young with many years of growth ahead
- Expect higher taxes in retirement
- Want tax-free income flexibility in retirement
Consider both: Many experts recommend splitting contributions for tax diversification.
How to Use This Calculator
Our 401(k) calculator projects your retirement savings growth:
- Enter Current Situation:
- Current age and retirement age
- Current 401(k) balance
- Annual salary
- Set Contribution Details:
- Your contribution percentage
- Employer match formula
- Set Investment Return:
- Expected annual return (7-10% historically)
Results include:
- Projected retirement balance
- Total contributions (yours + employer)
- Investment growth
- Monthly retirement income estimate (4% rule)
Maximizing Employer Match
Why employer match matters:
Employer match is essentially free money—a guaranteed 50-100% return on your contribution. Not getting the full match is leaving money on the table.
Example of match value:
- Salary: $75,000
- Match: 100% of first 4%
- Your contribution: $3,000 (4%)
- Employer match: $3,000 (free!)
- Over 30 years at 7%: $580,000 from match alone
Strategies:
- At minimum, contribute enough to get full match
- Then consider Roth IRA for additional retirement savings
- After maxing IRA, return to max 401(k)
- Consider contribution order: Match → HSA → Roth IRA → 401(k) max
Choosing 401(k) Investments
Common investment options:
- Target-date funds: Automatically adjust based on retirement year
- Index funds: Low-cost market tracking (S&P 500, Total Market)
- Actively managed funds: Higher fees, try to beat market
- Bond funds: Lower risk, lower return
- Company stock: Use sparingly (concentration risk)
Age-based allocation rule of thumb:
- Stocks percentage = 110 - your age
- Example: Age 30 → 80% stocks, 20% bonds
- Age 50 → 60% stocks, 40% bonds
- Adjust based on risk tolerance
Keep costs low:
- Check expense ratios (aim for under 0.5%)
- Index funds typically have lowest fees
- 1% annual fee difference costs hundreds of thousands over career
Withdrawal Rules and Penalties
Standard withdrawal rules:
- Penalty-free withdrawals at age 59½
- 10% early withdrawal penalty before 59½
- Plus ordinary income tax on Traditional withdrawals
- RMDs begin at age 73 (Traditional only)
Exceptions to 10% penalty:
- Age 55+ and separated from employer (Rule of 55)
- Substantially equal periodic payments (72(t))
- Disability
- Medical expenses exceeding 7.5% of AGI
- IRS levy
- Qualified domestic relations order (divorce)
401(k) loans:
- Borrow up to 50% of balance or $50,000 (whichever is less)
- Must repay within 5 years (15 for home purchase)
- If you leave job, often due within 60 days
- Generally not recommended—disrupts compounding
Worked Examples
401(k) Growth with Employer Match
Problem:
Age 30, earning $70,000, contributing 6% with 50% employer match up to 6%. Project balance at 65 with 7% return.
Solution Steps:
- 1Your contribution: $70,000 × 6% = $4,200/year
- 2Employer match: $4,200 × 50% = $2,100/year
- 3Total annual: $6,300
- 4Monthly contribution: $525
- 5Years to retirement: 35
- 6FV = $525 × [(1.00583)^420 - 1] / 0.00583
- 7FV ≈ $958,000
Result:
Projected balance at 65: ~$958,000. Your contributions: $147,000, Employer match: $73,500, Investment growth: $737,500.
Catch-Up Contribution Impact
Problem:
Age 50 with $400,000 saved. Max contributions ($30,500) with 4% match on $100,000 salary at 7% return. Balance at 65?
Solution Steps:
- 1Starting balance: $400,000
- 2Your contribution: $30,500/year
- 3Employer match: $4,000/year (4% of $100K)
- 4Total annual: $34,500
- 515 years to retirement
- 6$400,000 grows to ~$1,103,000
- 7New contributions grow to ~$869,000
Result:
Projected balance at 65: ~$1,972,000. Catch-up contributions add significantly to final balance.
Traditional vs Roth 401(k) Comparison
Problem:
Compare $20,000 annual contribution for 25 years at 7% return. Current tax bracket: 22%, expected retirement bracket: 22%.
Solution Steps:
- 1Traditional: $20,000 pre-tax contribution
- 2Tax savings now: $4,400/year
- 3Grows to: ~$1,353,000 (all pre-tax)
- 4After 22% tax: ~$1,055,000
- 5Roth: $20,000 after-tax contribution
- 6(Cost $25,641 pre-tax to contribute $20K)
- 7Grows to: ~$1,353,000 (all tax-free)
Result:
At same tax rate, results are nearly equal. Roth slightly wins due to contribution basis. Roth also provides tax-free flexibility and no RMDs.
Tips & Best Practices
- ✓Always contribute enough to get the full employer match—it's free money
- ✓Increase contributions by 1% each year or with each raise
- ✓Consider target-date funds for automatic age-appropriate allocation
- ✓Review and rebalance your portfolio annually
- ✓Keep expense ratios low—prefer index funds under 0.5%
- ✓Don't take 401(k) loans unless absolutely necessary
- ✓Roll over old 401(k)s to avoid orphaned accounts with high fees
- ✓Consider Roth contributions if you're early in your career
Frequently Asked Questions
Sources & References
- IRS: 401(k) Plans (2024)
- DOL: 401(k) Plan Information (2024)
- Fidelity: Retirement Savings Guidelines (2024)
Last updated: 2026-01-22