401(k) Basics: What Beginners Should Know
Your 401(k) at work could be worth hundreds of thousands in free money from employer matching alone. Here is how contribution limits, vesting, and fund selection actually work.
Don't have time? Here's what you need to know:
- 1Always contribute enough to capture the full employer match -- it is an instant 50-100% return on your money
- 2The 2024 employee contribution limit is $23,000 ($30,500 if you are 50+), not counting employer contributions
- 3Pick the lowest-cost index fund in your plan, ideally under 0.10% expense ratio
- 4Check your vesting schedule so you do not leave employer match money on the table when switching jobs
The Employer Match: Free Money You Should Never Leave on the Table
Most employers match a percentage of your 401(k) contributions. A common formula is 50% match on the first 6% of your salary. If you earn $60,000 and contribute 6% ($3,600/year), your employer adds another $1,800. That is a guaranteed 50% return on your money before any market gains.
About 1 in 5 workers does not contribute enough to get the full match. At $1,800/year over a 30-year career with 8% returns, that is roughly $200,000 in lost wealth. Check your plan documents or ask HR what the match formula is and make sure you are hitting it.
2024 Limits, Catch-Up Contributions, and Vesting Schedules
In 2024, you can contribute up to $23,000 to your 401(k) ($30,500 if you are 50 or older). Your employer's match does not count toward your limit -- it is on top. The combined employee + employer limit is $69,000.
Watch out for vesting schedules. Some employers require you to work there for 3-5 years before you fully own the matched money. If you leave before you are vested, you could lose some or all of the match. Check your plan's vesting schedule in your benefits portal.
| 401(k) Feature | 2024 Detail |
|---|---|
| Employee Contribution Limit | $23,000 ($30,500 if 50+) |
| Total Limit (with employer) | $69,000 |
| Common Match Formula | 50% of first 6% of salary |
| Typical Vesting | 3-year cliff or 6-year graded |
| Early Withdrawal Penalty | 10% + income tax before age 59.5 |
| Loan Option | Up to 50% of balance or $50,000 (plan-dependent) |
Picking Investments Inside Your 401(k)
Most 401(k) plans offer 15-30 fund options. Look for the lowest-cost index fund that tracks the S&P 500 or total U.S. market. This is often labeled something like "S&P 500 Index Fund" or "Large Cap Index." Check the expense ratio -- good plans have funds under 0.10%. Bad plans charge 0.50%+ for essentially the same thing.
If your plan offers a target-date fund with a low expense ratio (under 0.15%), that is a perfectly solid one-fund solution. Pick the one closest to your expected retirement year. Vanguard and Fidelity target-date index funds charge 0.10-0.12%.
Tip: If every fund in your 401(k) has high fees (above 0.50%), contribute only enough to get the employer match. Put the rest in a Roth IRA at a low-cost broker where you can pick cheap ETFs like VTI.
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Traditional 401(k) vs. Roth 401(k)
Many employers now offer a Roth 401(k) option alongside the traditional one. Traditional 401(k) contributions come out of your paycheck pre-tax, reducing your taxable income today. Roth 401(k) contributions come from after-tax pay, but withdrawals in retirement are tax-free.
The same logic as traditional vs. Roth IRA applies: if you expect to be in a higher tax bracket in retirement, go Roth. If you are in a high bracket now and expect a lower one later, go traditional. You can even split contributions between both to diversify your tax exposure.
Frequently Asked Questions
Should I take a 401(k) loan to pay off high-interest debt?
Generally no. A 401(k) loan pulls money out of the market, meaning you miss potential growth. If you leave your job, the loan typically must be repaid within 60 days or it becomes a taxable distribution with a 10% penalty. Pay down high-interest debt with extra income instead, not retirement funds.
What happens to my 401(k) if I change jobs?
You have three options: leave it with your old employer (if the plan allows it), roll it into your new employer's 401(k), or roll it into a traditional IRA at a broker like Fidelity or Schwab. Rolling into an IRA usually gives you the best investment options and lowest fees.
How much of my salary should I contribute to my 401(k)?
At minimum, enough to get the full employer match. Ideally, save 15-20% of your gross income across all retirement accounts (401(k) + IRA combined). If that feels impossible right now, start at the match level and increase by 1% every time you get a raise.
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Alex Harrington
CFA Level II Candidate, Finance & Economics
Alex Harrington is an independent ETF researcher and personal finance writer with over 8 years of experience analyzing exchange-traded funds. A CFA Level II candidate with a background in economics, Alex has reviewed 800+ ETFs and helped thousands of beginners build their first investment portfolios through clear, jargon-free education.
This content is for educational purposes only and does not constitute financial advice. Past performance does not guarantee future results. Consult a licensed financial advisor before making investment decisions.