The core difference: who sets it up and who contributes

A Roth IRA is an individual retirement account you open yourself through a bank, brokerage, or credit union. You contribute your own money directly. A Roth 401(k) is a workplace retirement plan your employer offers and administers. Your employer sets the rules, and you contribute through payroll deductions.

This distinction matters because it changes who controls the account, what happens if you leave your job, and how much you can put in each year. With a Roth IRA, you are the account owner from day one. With a Roth 401(k), your employer holds the plan, and you are a participant in it.

Key Takeaways

  • A Roth IRA is opened by you individually; a Roth 401(k) is offered by your employer and funded through payroll.
  • Roth 401(k) contribution limits are much higher—$23,500 per year in 2024, compared to $7,000 for a Roth IRA.
  • Roth IRAs have income limits that may prevent high earners from contributing; Roth 401(k)s have no income limits.
  • Both let your money grow tax-free and allow tax-free withdrawals in retirement, but the rules for accessing money before retirement differ.
  • If you leave your job, you keep your Roth 401(k) balance but must decide whether to leave it there or roll it into a Roth IRA.

Contribution limits and income restrictions

The annual contribution limit for a Roth IRA is $7,000 (as of 2024), or $8,000 if you are age 50 or older. However, you can only contribute if your income falls below a certain threshold. For 2024, if you are single, the limit phases out between $146,000 and $161,000 of income. If you are married filing jointly, it phases out between $230,000 and $240,000. Once your income exceeds the upper limit, you cannot contribute to a Roth IRA at all.

A Roth 401(k) has no income limits. You can contribute $23,500 per year (or $31,000 if you are 50 or older) regardless of how much you earn. This makes a Roth 401(k) the only Roth option for high-income earners who want to save in a Roth account.

Your employer may also match contributions to a Roth 401(k), though the match itself goes into a traditional (pre-tax) account. With a Roth IRA, there is no employer match because there is no employer involved.

Tax treatment now and in retirement

Both accounts work the same way on the tax side: you contribute money that has already been taxed, and when you withdraw in retirement, the money comes out tax-free. This includes all the growth your investments earned over the years.

The difference is in the timing of the tax benefit. With a Roth IRA, you get no tax deduction when you contribute—you pay tax on that money in the year you earn it. With a Roth 401(k), the same thing happens: no deduction. But because a Roth 401(k) is a workplace plan, your employer withholds taxes from your paycheck before the money goes into the account, so the tax is already handled.

At age 59½, both accounts let you withdraw your contributions and earnings tax-free, as long as the account has been open for at least five years. This five-year rule is the same for both.

Rules for withdrawing money before retirement

A Roth IRA lets you withdraw your contributions (the money you put in) at any time, tax-free and penalty-free, without waiting until retirement. You can only withdraw earnings (the investment gains) before age 59½ if you meet specific exceptions, such as a first-time home purchase or a financial hardship.

A Roth 401(k) is stricter. You cannot withdraw contributions or earnings before age 59½ without paying income tax and a 10% penalty, with only a few narrow exceptions (disability, death, or a "substantially equal periodic payment" arrangement). The Roth 401(k) does not give you the same flexibility to tap contributions early that a Roth IRA does.

This is one of the biggest practical differences. If you think you might need access to your money before retirement, a Roth IRA is more forgiving.

What happens when you leave your job

When you leave your job, your Roth 401(k) balance stays yours. You have three main options: leave it in your former employer's plan (if the balance is large enough), roll it into a Roth IRA, or roll it into a new employer's Roth 401(k) if your new job offers one.

A Roth IRA, by contrast, is already yours and goes nowhere. You own it outright, and it is not tied to any employer. If you change jobs ten times, your Roth IRA stays the same account.

Rolling a Roth 401(k) into a Roth IRA is usually straightforward and does not trigger taxes, as long as you do a direct rollover (the money moves from plan to plan without passing through your hands). After the rollover, you gain the Roth IRA's more flexible early-withdrawal rules.

Investment options and account management

A Roth 401(k) typically offers a limited menu of investment choices—usually mutual funds or target-date funds selected by your employer. You choose among what the plan offers, but you cannot pick individual stocks or other investments outside that list.

A Roth IRA gives you much broader control. You can open one at almost any bank or brokerage and invest in stocks, bonds, mutual funds, exchange-traded funds (ETFs), or other securities. Some custodians even allow self-directed IRAs for real estate or alternative investments, though this is less common.

This flexibility is another reason people prefer Roth IRAs if they have the income to contribute to one. You are not limited by your employer's plan menu.

Required minimum distributions in retirement

A Roth IRA has no required minimum distributions (RMDs) during your lifetime. You can leave the money in the account as long as you want and withdraw only what you need.

A Roth 401(k) does require you to begin taking distributions at age 73 (as of 2023, under the SECURE 2.0 Act). The amount is calculated based on your age and account balance. However, if you are still working and do not own more than 5% of the company, you may be able to delay RMDs until you retire.

If you want to avoid RMDs, you can roll your Roth 401(k) into a Roth IRA after you leave the job. This is a common strategy for people who want maximum flexibility in retirement.

Which one should you choose?

If your employer offers a Roth 401(k) and you earn too much to contribute to a Roth IRA, the Roth 401(k) is your only Roth option. If your employer offers both a Roth 401(k) and an employer match, contributing enough to get the full match is usually worth doing, even if you also have a Roth IRA.

If your income is below the Roth IRA limits and you want maximum flexibility and control, a Roth IRA is typically the better choice. You can withdraw contributions early if needed, choose your own investments, and avoid RMDs in retirement.

Many people use both: they contribute to their employer's Roth 401(k) to get the match and take advantage of the higher contribution limit, and they also fund a Roth IRA for the flexibility and investment control.

Frequently Asked Questions

Can I have both a Roth IRA and a Roth 401(k) at the same time?

Yes. The contribution limits are separate, so you can max out a Roth 401(k) and also contribute to a Roth IRA in the same year, as long as your income is below the Roth IRA limit. Many people do this to save as much as possible in Roth accounts.

What if I roll my Roth 401(k) into a Roth IRA after I retire?

A direct rollover from a Roth 401(k) to a Roth IRA does not trigger taxes or penalties. After the rollover, the money follows Roth IRA rules: no RMDs during your lifetime, more flexible early withdrawal rules, and broader investment options. This is a common move for people who want to simplify their accounts.

Do I pay taxes when I contribute to a Roth 401(k)?

No, not again. You contribute with after-tax dollars (your employer withholds income tax from your paycheck), so the money going into the account is already taxed. When you withdraw in retirement, there is no additional tax.

What if my employer does not offer a Roth 401(k), only a traditional 401(k)?

You can still open and fund a Roth IRA on your own, as long as your income is below the limit. A Roth IRA and a traditional 401(k) work well together because they have different tax treatments—one is pre-tax, one is after-tax.

Can I convert a traditional 401(k) to a Roth 401(k)?

Some employers allow in-plan Roth conversions, which let you move money from a traditional 401(k) to a Roth 401(k) within the same plan. This triggers taxes on the amount converted. Ask your plan administrator whether this option is available. You can also roll a traditional 401(k) into a Roth IRA after you leave the job, though that also creates a tax bill.