401(k) Calculator
Model retirement balance accumulation, compound growth, and employer matching funds up to statutory limits.
Growth Milestone Schedule
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How a 401(k) Builds Long-Term Wealth
A 401(k) is an employer-sponsored, tax-advantaged defined-contribution retirement account recognized under Section 401(k) of the Internal Revenue Code. When you contribute directly from your paycheck on a pre-tax basis, you lower your current taxable income while allowing capital gains, dividends, and interest to compound untouched until retirement withdrawals begin.
For deeper analysis and related planning, you can also explore our EMI Calculator and Simple Interest Calculator.
The Power of the Employer Match
An employer matching contribution represents an immediate, guaranteed return on investment. For example, in a classic 50% match up to 6% of salary, an employee earning $80,000 who deposits $4,800 receives an immediate $2,400 in company funds, which is effectively a 50% instant return before any market performance occurs. Financial planners almost universally recommend contributing at least enough to capture your full employer match before investing in non-matched vehicles.
2024 IRS Contribution Limits & Catch-Up Provisions
The IRS revises annual retirement plan limits to account for cost-of-living adjustments:
- Standard Elective Deferral (Under 50): $23,000 for the 2024 tax calendar.
- Catch-Up Contribution (Age 50 and Older): An additional $7,500, permitting a total individual deferral of $30,500.
- Combined Employee + Employer Cap (Section 415(c)): The lesser of 100% of participant compensation or $69,000 ($76,500 including catch-up).
Planning Your Retirement Safe Withdrawal Rate
Accumulating a lump sum is only half the retirement equation; decumulating safely is equally critical. Based on the widely cited Trinity Study and historical US equity/bond market simulations, a 4% Safe Withdrawal Rate (SWR) provides a high probability of preserving capital over a traditional 30-year retirement horizon. For instance, a $1,500,000 portfolio generates approximately $60,000 annually ($5,000 per month) before taxes.
Frequently Asked Questions
What are the 401(k) contribution limits for 2024?
For the 2024 tax year, the IRS elective deferral limit for employees participating in a 401(k) plan is $23,000. Individuals aged 50 and older can contribute an additional $7,500 catch-up contribution, for a total employee limit of $30,500.
How does an employer 401(k) match work?
An employer match is additional money contributed by your employer to your retirement account based on your salary deferral. A common formula is a 50% match up to 6% of your salary: if you contribute 6% of your salary, your employer contributes an extra 3% in free retirement funds.
What is the 4% safe withdrawal rule in retirement?
The 4% rule is an empirical financial planning benchmark originating from the Trinity Study. It suggests you can safely withdraw 4% of your total retirement portfolio in year one of retirement, adjusted annually for inflation, with a high historical probability of not depleting your assets over a 30-year retirement.