Before starting your 401(k), understand three critical things: always get the full employer match (it’s free money), choose low-cost index funds over expensive managed funds, and decide between Traditional and Roth based on your current tax bracket.
What You Need to Know
| # | Key Point | Why It Matters |
|---|---|---|
| 1 | Always get the full employer match | It’s a 50-100% guaranteed return |
| 2 | Choose low-cost funds | Fees silently eat your returns |
| 3 | Traditional vs. Roth changes your taxes | Pay now or pay later |
| 4 | Contribution limits are generous | $23,500/year (+ catch-up if 50+) |
| 5 | Don’t cash out when you leave a job | 10% penalty + tax = lose 30-40% |
| 6 | Vesting schedule determines what’s yours | Employer match may not be fully yours yet |
| 7 | Increase contributions annually | Even 1%/year makes a huge difference |
Employer Match: Don’t Leave Free Money Behind
| Match Type | Your Contribution | Employer Adds | Free Money on $80K Salary |
|---|---|---|---|
| 100% match up to 3% | 3% ($2,400) | $2,400 | $2,400/year |
| 50% match up to 6% | 6% ($4,800) | $2,400 | $2,400/year |
| 100% match up to 6% | 6% ($4,800) | $4,800 | $4,800/year |
| Dollar-for-dollar up to 4% | 4% ($3,200) | $3,200 | $3,200/year |
Not contributing enough to get the full match is literally turning down part of your salary.
Contribution Limits (2025-2026)
| Category | Limit |
|---|---|
| Employee contribution (under 50) | $23,500 |
| Catch-up (age 50-59) | +$7,500 = $31,000 total |
| Enhanced catch-up (age 60-63) | +$11,250 = $34,750 total |
| Employer + employee combined | $70,000 |
Traditional vs. Roth 401(k)
| Feature | Traditional 401(k) | Roth 401(k) |
|---|---|---|
| Tax on contributions | Deducted from taxable income (tax break now) | No deduction (pay taxes now) |
| Tax on withdrawals | Taxed as ordinary income | Tax-free |
| Best when | Current tax bracket is high | Current bracket is low |
| RMDs required? | Yes, starting at 73 | No (after rollover to Roth IRA) |
| $1,000 contributed | Costs ~$750 after tax savings | Costs full $1,000 |
| $1,000 withdrawn in retirement | ~$750 after taxes | Full $1,000 tax-free |
How to Choose Investments
| Option | Best For | Typical Expense Ratio |
|---|---|---|
| Target-date fund | Don’t want to manage investments | 0.10-0.75% |
| S&P 500 index fund | Core US stock exposure | 0.02-0.15% |
| Total stock market index | Broadest US diversification | 0.02-0.15% |
| International stock index | Global diversification | 0.05-0.20% |
| Bond index fund | Stability/conservative allocation | 0.03-0.15% |
| Company stock | Avoid — don’t concentrate in one stock | Varies |
The Cost of Fees
| Expense Ratio | Value of $10,000 After 30 Years (8% return) |
|---|---|
| 0.05% | $98,600 |
| 0.25% | $93,800 |
| 0.50% | $88,100 |
| 1.00% | $78,000 |
| 1.50% | $69,300 |
A 1% difference in fees costs $20,600 on just $10,000 over 30 years. On larger balances, the impact is devastating.
The Power of Starting Early and Increasing
| Strategy | Monthly Contribution | Balance at Age 65 (8% return) |
|---|---|---|
| Start at 25, contribute $300/month | $300 | $1,054,000 |
| Start at 35, contribute $300/month | $300 | $447,000 |
| Start at 25, increase 1%/year | $300 → $600 | $1,600,000+ |
| Start at 35, contribute $600/month | $600 | $894,000 |
Starting 10 years earlier at half the contribution beats starting later at double the contribution.
Common 401(k) Mistakes
| Mistake | Impact |
|---|---|
| Not contributing enough to get full match | Leaving $2,000-$5,000/year on the table |
| Cashing out when changing jobs | 30-40% lost to taxes and penalties |
| Choosing high-fee funds over index options | Tens of thousands lost over career |
| Only investing in company stock | One bad quarter can devastate retirement |
| Not increasing contributions annually | Missing compounding opportunity |
| Borrowing from 401(k) | Interrupts compounding; risky if you leave job |
The Bottom Line
Your 401(k) is the most powerful wealth-building tool most Americans have access to. Step 1: Contribute enough to get the full employer match. Step 2: Choose the lowest-cost index fund available. Step 3: Increase your contribution by 1% every year. Step 4: Never cash it out when you change jobs. These four steps, followed consistently for 30+ years, build substantial wealth.
For more on each of these topics, see the 401(k) contribution limits, traditional vs. Roth 401(k), vesting schedules, and average employer match rates. Return to the 401(k) Complete Guide for the full overview.
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