Roth IRA vs. 401(k): What's the Difference and Which Should You Open First?

If you're an American starting to save for retirement, you've probably heard both of these terms thrown around. The Roth IRA and the 401(k) are two of the most powerful retirement accounts available — but they work very differently. Here's a clear breakdown of each, how they compare, and the smart order for funding them.

How the 401(k) Works

A 401(k) is an employer-sponsored retirement plan. Your contributions come out of your paycheck before taxes, which reduces your taxable income for the year. If you earn $80,000 and contribute $10,000 to your 401(k), you're only taxed on $70,000. Your investments grow tax-deferred inside the account. The catch: when you withdraw in retirement, every dollar is taxed as ordinary income. The 2026 contribution limit is $23,500 (or $31,000 if you're 50+, and $34,750 if you're 60-63 thanks to the SECURE 2.0 super catch-up). The biggest advantage of the 401(k) is employer matching. Many companies match a percentage of your contributions — typically 50% to 100% of the first 3-6% of your salary. If your employer matches 100% of the first 4%, and you earn $80,000, that's $3,200 in free money every year. This is the closest thing to a guaranteed return in all of investing.

How the Roth IRA Works

A Roth IRA is an individual retirement account you open yourself at a brokerage (Vanguard, Fidelity, Schwab, etc.). You contribute after-tax dollars — no tax deduction upfront. But the trade-off is massive: everything inside the account grows tax-free, and withdrawals in retirement are completely tax-free. No taxes on gains, dividends, or withdrawals. Ever. The current annual contribution limit is $7,000 ($8,000 if you're 50+). There are income limits — if you earn above roughly $150,000 as an individual or $236,000 as a married couple, your ability to contribute directly starts phasing out. You can also withdraw your contributions (not earnings) at any time without penalty, making the Roth IRA more flexible than the 401(k) for emergencies.

The Smart Order: Get the Match First

Here's the strategy most financial experts recommend, and it makes perfect sense when you understand the math. Step 1: Contribute to your 401(k) up to the employer match. If your company matches 4%, contribute at least 4%. Not doing this is literally leaving free money on the table. A 100% match is an instant 100% return on your contribution — no investment in history can beat that. Step 2: Max out your Roth IRA. After securing the match, redirect additional savings to your Roth IRA. The tax-free growth and tax-free withdrawals make it one of the most powerful wealth-building tools available. At $7,000 per year invested from age 25 to 65, your Roth IRA alone could grow to over $3 million — all completely tax-free. Step 3: Go back and max out the 401(k). If you still have money to invest after maxing the Roth IRA, increase your 401(k) contributions toward the $23,500 annual limit.

Why Tax Diversification Matters

Having both a 401(k) and a Roth IRA gives you something called tax diversification. In retirement, you'll have two buckets of money: one that's taxed when you withdraw (401k) and one that's completely tax-free (Roth). This gives you flexibility to manage your tax bill in retirement. Need to keep your taxable income low to qualify for certain benefits or avoid a higher tax bracket? Withdraw from the Roth. Have room in a low tax bracket? Withdraw from the 401(k). Having both options is like having two doors to choose from — you can always pick the one that saves you the most money in any given year. Nobody knows what tax rates will look like in 20 or 30 years. Having money in both pre-tax and post-tax accounts hedges your bets against whatever happens.