401(k) vs Roth IRA: Which Retirement Account Is Right for You?
A 401(k) lets you contribute up to $23,000 pre-tax in 2024 and often includes an employer match, while a Roth IRA allows $7,000 in after-tax dollars with tax-free withdrawals in retirement — and the right choice depends mostly on your current tax rate versus your expected rate in retirement.
401(k) vs Roth IRA: Side-by-Side
| 401(k) | Roth IRA | |
|---|---|---|
| 2024 contribution limit | $23,000 ($30,500 if 50+) | $7,000 ($8,000 if 50+) |
| Tax treatment | Pre-tax; taxed on withdrawal | After-tax; withdrawals tax-free |
| Employer match | Yes — free money from employer | No employer match |
| Income limits to contribute | None (employer plan) | $161,000 single / $240,000 married (2024) |
| Required minimum distributions | Yes, starting at age 73 | None during owner's lifetime |
| Investment options | Limited to plan's fund menu | Unlimited (stocks, ETFs, bonds) |
| Early withdrawal penalty | 10% on earnings before 59½ | Contributions anytime; earnings penalized |
Which should you choose?
Pick the 401(k) first when your employer offers a match — capturing that free money beats any other return. Pick the Roth IRA when you're under the income limits and expect to pay higher taxes in retirement than you do today.
Many financial planners recommend doing both: max the 401(k) match, then fully fund a Roth IRA, then return to the 401(k) if money remains.
How a 401(k) works
A 401(k) is an employer-sponsored retirement plan that lets you defer part of your paycheck before taxes are taken out. In 2024 the IRS lets you contribute up to $23,000 — or $30,500 if you're 50 or older.
Your contribution reduces your taxable income today. A $5,000 contribution cuts your taxable income by $5,000, which saves roughly $1,100 if you're in the 22% bracket. You'll owe income tax on withdrawals in retirement.
The real power of a 401(k) is the employer match. Many employers match 50–100% of your contribution up to a percentage of your salary. That match is an instant 50–100% return — no investment can reliably beat it. Use the retirement calculator to see how match dollars compound over time.
How a Roth IRA works
A Roth IRA is an individual account you open directly with a brokerage — your employer is not involved. You contribute after-tax dollars, so there's no upfront tax break.
The payoff comes later: every qualified withdrawal in retirement is completely tax-free, including decades of growth. A $7,000 contribution that grows to $70,000 over 30 years can be withdrawn without owing a single dollar in taxes.
Roth IRAs have income limits. In 2024, single filers earning above $161,000 (or $240,000 married filing jointly) cannot contribute directly. High earners can use the backdoor Roth IRA strategy to get around this limit. Use the investment calculator to model Roth growth projections.
Which account saves more in taxes?
The answer depends on whether your tax rate is higher now or in retirement. Traditional 401(k) wins if you're in a high bracket today and expect a lower rate later. Roth IRA wins if you're in a lower bracket now and expect taxes to rise.
For a 30-year-old in the 22% bracket saving $7,000/year, choosing Roth IRA over Traditional 401(k) can save $200,000+ in lifetime taxes if retirement rates end up higher — but cost you $50,000+ if rates fall.
When in doubt, diversify: hold some pre-tax money (401k/Traditional IRA) and some after-tax money (Roth IRA) so you can draw from whichever bucket is taxed more favorably each year.
401(k) vs Roth IRA: can you have both?
Yes — and most financial planners recommend it. There's no rule against having a 401(k) and a Roth IRA at the same time. The two accounts have separate, independent contribution limits.
The optimal order is usually: contribute to the 401(k) up to the full employer match → max out the Roth IRA → go back and max the 401(k) with any remaining savings.
If you're self-employed, a SEP-IRA or Solo 401(k) can replace the employer plan with even higher limits. The retirement calculator lets you model multiple account scenarios side by side. When you're ready to open a Roth IRA, our best IRA accounts roundup compares where to hold it.
The break-even tax rate: exactly when Roth wins
The Roth IRA beats the Traditional 401(k) at the exact tax-rate crossover point where your future withdrawal rate equals your current contribution rate — and understanding that crossover gives you a precise decision rule, not just a gut feeling.
Here's the math. Suppose you're in the 22% bracket today and contribute $7,000 to a Roth IRA. That $7,000 grows to $56,000 over 30 years at 7% — and you owe $0 in taxes when you withdraw it. To match that outcome with a Traditional 401(k), you'd also contribute $7,000 (but it reduces your taxable income by $7,000 × 22% = $1,540 in upfront tax savings). If you invest that $1,540 tax savings separately, it grows to about $12,376 at the same rate. In retirement, the $56,000 Traditional 401(k) balance is taxed on withdrawal. At a 22% rate, you net $43,680 — plus the $12,376 side fund — total $56,056. At a 10% retirement rate, you net $50,400 + $12,376 = $62,776. At 32%, you net $38,080 + $12,376 = $50,456.
The break-even occurs when your current and future rates are equal — in that case both accounts leave the same after-tax dollars. The Roth wins whenever your future rate is higher than your current rate; the Traditional 401(k) wins when your current rate is higher than your future rate. The crossover is one number: your current marginal rate.
A non-obvious implication: most 30-year-olds today face a future tax environment with more uncertainty than their parents did. Tax rates have nowhere to go but up given long-run federal deficit trends (CBO projects debt-to-GDP above 100% by the mid-2030s). Betting on lower retirement rates requires betting against that secular trend. Many planners now recommend Roth contributions for anyone in the 24% bracket or below, even if they expect to drop a bracket in retirement, precisely because of this directional uncertainty.
One more often-missed variable: Required Minimum Distributions (RMDs) can push your retirement tax rate above what your paycheck-based rate implied. At 73, you must withdraw from a Traditional 401(k) whether you need the money or not. Add Social Security income (up to 85% of which is taxable), pension income, and rental income — and many retirees find themselves in the 22–24% bracket even on what looks like a modest budget. A Roth IRA has no RMDs and therefore lets you control your taxable income in retirement. Use the retirement calculator to model how RMDs interact with your projected income.
Frequently asked questions
Is a Roth IRA better than a 401(k)?
Neither is universally better. A 401(k) is usually the first priority because of the employer match and higher contribution limit. A Roth IRA is better for tax-free retirement income and flexible withdrawals. Most savers benefit from using both.
What happens to my 401(k) if I change jobs?
You can roll it into your new employer's 401(k), roll it into an IRA, leave it with the old employer, or cash it out (which triggers taxes and a 10% penalty). Rolling it over is usually the best move to keep the money growing tax-deferred.
Can I contribute to both a 401(k) and Roth IRA in the same year?
Yes. They have separate limits. In 2024 you can contribute $23,000 to a 401(k) and $7,000 to a Roth IRA in the same year, provided your Roth IRA contribution doesn't exceed the income limits.
What is the 401(k) income limit for 2024?
There is no income limit to contribute to a 401(k). Unlike a Roth IRA, any employee covered by an employer plan can contribute regardless of how much they earn.
When can I withdraw from a Roth IRA without penalty?
You can withdraw your Roth IRA contributions (not earnings) at any time without penalty. To withdraw earnings tax-free, the account must be at least 5 years old and you must be 59½ or older.