401k vs Roth IRA: Choosing the Right Retirement Account

How does a 401k differ from a Roth IRA?

A 401k is a workplace plan: your employer sponsors it, contributions come straight from payroll, and many employers match part of what you put in. A Roth IRA is an account you open yourself at a brokerage, funded with after-tax dollars, with no employer involvement.

The two also differ sharply on limits, taxes, and flexibility. A 401k lets you contribute far more each year and may lower your taxable income today. A Roth IRA has a lower limit and income restrictions, but offers tax-free withdrawals and much wider investment choice — a 401k vs Roth IRA calculator compares the two side by side.

When is a 401k the better choice?

The 401k's biggest advantage is the employer match — free money a Roth IRA simply cannot offer. Its second advantage is scale: at $24,500 (plus catch-ups), it lets you shelter more than three times what a Roth IRA allows, which matters enormously for high earners and late starters.

A traditional 401k also reduces your taxable income now, and there is no income limit blocking high earners from contributing. For someone earning too much to fund a Roth IRA directly, the 401k — especially its Roth option — is often the main tax-advantaged vehicle available.

When is a Roth IRA the better choice?

The Roth IRA's strengths are tax-free growth, flexibility, and choice. Qualified withdrawals in retirement are entirely tax-free, and there are no required minimum distributions during your lifetime, so the money can keep growing untouched.

It is also more flexible in a pinch: you can withdraw your own contributions (not earnings) at any time without tax or penalty. And because you open it yourself, you can invest in almost any stock, bond, or fund, rather than a limited plan menu that may carry higher fees.

What order should you fund a 401k and Roth IRA?

Because each account has a distinct strength, many savers do not choose — they use both, in a sequence designed to capture the best of each. This is a general framework, not personalized advice.

• 1. Contribute to the 401k up to the full employer match — never leave free money behind.
• 2. If eligible, max out a Roth IRA for its tax-free growth and flexibility.
• 3. Return to the 401k and contribute more, toward the annual limit.
• 4. Consider additional taxable investing once tax-advantaged space is used.

What are the Roth IRA income limits?

Unlike a 401k, a Roth IRA phases out for higher earners. Above certain income thresholds you can contribute a reduced amount, and above a higher threshold you cannot contribute directly at all. The exact figures adjust annually, so check the current limits for your filing status — our 401k FAQ hub covers Roth IRA eligibility questions.

High earners who are phased out sometimes use a 'backdoor Roth IRA' — contributing to a traditional IRA and converting it — though the tax treatment can be complex if you hold other pre-tax IRA money. A tax professional can confirm whether it makes sense for you.