The Core Difference: When You Pay Tax
🏦 Traditional 401(k)
Contribute pre-tax dollars. You don't pay income tax on contributions now. But you pay tax on every dollar you withdraw in retirement. Think of it as tax later.
💜 Roth IRA
Contribute post-tax dollars. You pay income tax now. But everything inside — contributions AND growth — comes out completely tax-free in retirement.
The Employer Match: Free Money You Can't Ignore
If your employer matches 50% of contributions up to 6% of salary, and you earn $60,000 — contributing 6% ($3,600) gets you a free $1,800 employer match. That's an instant 50% return before the market does anything. No investment vehicle on earth beats this. Always contribute at least enough to capture the full match.
Full Comparison (2025)
| Traditional 401(k) | Roth IRA | |
|---|---|---|
| Tax treatment | Pre-tax (reduces taxable income now) | Post-tax (tax-free in retirement) |
| 2025 contribution limit | $23,500 ($31,000 if age 50+) | $7,000 ($8,000 if age 50+) |
| Employer match | Yes — most employers match 3–6% | No employer match |
| Income limits | None (but deduction phases out) | Phase-out: $146K–$161K single / $230K–$240K MFJ |
| Withdrawals in retirement | Taxed as ordinary income | Tax-free (contributions + growth) |
| Required Minimum Distributions | Yes, starting at age 73 | No RMDs during owner's lifetime |
| Early withdrawal penalty | 10% + taxes before age 59½ | Contributions: no penalty. Growth: 10% + taxes |
| Investment options | Limited to employer plan offerings | Any broker — full market access |
The Exact Order to Fund Your Accounts
Follow this waterfall — in order — with any money you can invest each month.
401(k) up to employer match
Always do this firstThis is a 50–100% instant return on investment. Never leave free money on the table. If your employer matches 4%, contribute at least 4%.
Max out Roth IRA ($7,000)
Do this nextIf you qualify (income limits apply), max your Roth IRA next. Tax-free growth for decades is one of the most powerful tools in personal finance.
Max out 401(k) ($23,500)
Then thisAfter the Roth IRA is maxed, go back and max your 401(k). The pre-tax savings reduce your taxable income significantly.
Taxable brokerage account
If you still have moreOnce all tax-advantaged accounts are maxed (lucky you!), invest the rest in a regular brokerage account. No contribution limits, but no special tax treatment.
Which Is Right for Your Situation?
| Your Situation | Lean Toward |
|---|---|
| You expect to be in a higher tax bracket in retirement | Roth IRA |
| You're in a high tax bracket today (>24%) | 401(k) first |
| Your employer offers a match | 401(k) first |
| You're early in your career | Roth IRA |
| You might need money before 59½ | Roth IRA |
| Your income exceeds Roth IRA limits | Traditional 401(k) |
High Earner? Try the Backdoor Roth
If your income exceeds the Roth IRA limits, you can still access Roth benefits via the "Backdoor Roth" strategy: contribute to a non-deductible Traditional IRA, then immediately convert it to a Roth. It's 100% legal and widely used. Consult a tax advisor or CPA to execute it correctly.
The Biggest 401(k) Mistake: Leaving Money in Default Funds
Many employers auto-enroll you in a money market or stable value fund — not a stock index fund. Your contributions may be sitting in something earning 1–2% instead of being invested in the market. Log into your 401(k) portal and verify what your money is actually invested in. Change it to a target-date fund or S&P 500 index fund if needed.
Key Takeaways
Always contribute to your 401(k) at least up to the employer match — it's an instant 50–100% return.
Roth IRA is usually better for young earners — tax-free growth for 30–40 years is extraordinary.
The "right" choice depends on your current vs. expected future tax rate. When in doubt, Roth.
You can have both a 401(k) AND a Roth IRA — they're not mutually exclusive.