Yes, you can roll a 401(k) into a Roth IRA, but you'll owe taxes on the money you convert

A rollover from a 401(k) to a Roth IRA is allowed, and it can make sense if you want to consolidate accounts or gain access to Roth's tax-free growth. The catch is straightforward: you must pay income tax on the full amount you move in the year you do it. If your 401(k) has $50,000 and you roll it all to a Roth, you'll owe taxes on $50,000 of income that year — even though you're not taking the money out to spend.

The IRS allows this move because a Roth IRA and a 401(k) are both retirement accounts, just with different rules. Your 401(k) contributions were made with pre-tax dollars (lowering your taxable income when you contributed), but Roth contributions are made with after-tax dollars. The rollover bridges that gap by having you pay the tax upfront.

Key Takeaways

  • You can roll a traditional 401(k) to a Roth IRA at any age, but you must pay income tax on the full amount converted in that tax year.
  • If your 401(k) contains both pre-tax and after-tax contributions, the IRS pro-rata rule requires you to treat them proportionally — you cannot convert only the after-tax portion without paying tax on a share of the pre-tax money.
  • You have 60 days from the time you receive the 401(k) distribution to deposit it into a Roth IRA, or the IRS treats it as a withdrawal and you lose the rollover benefit.
  • If you are under 59½, rolling over a 401(k) to a Roth does not trigger the early withdrawal penalty, but the tax bill itself can be substantial.
  • A direct rollover (401(k) trustee sends money straight to the Roth custodian) avoids the 60-day clock and withholding complications, and is simpler than an indirect rollover.

Direct rollover versus indirect rollover

The IRS recognizes two ways to move money from a 401(k) to a Roth IRA. A direct rollover means your 401(k) plan administrator sends the money directly to your Roth IRA custodian (usually a bank or brokerage). You never touch the money. This is the cleanest route: no withholding, no 60-day important date to worry about, and no risk of accidentally triggering a taxable distribution.

An indirect rollover means the 401(k) plan sends the check to you. You then deposit it into your Roth IRA yourself. This route has two traps. First, your 401(k) plan is required to withhold 20% for federal income tax, even though you intend to roll the money over — so if you have $50,000, you receive only $40,000 and owe the $10,000 withholding out of pocket to complete the rollover. Second, you have exactly 60 calendar days from the date you receive the check to deposit the full amount (including that $10,000) into the Roth, or the IRS treats it as a taxable withdrawal. If you miss the important date, you cannot undo it.

Most people choose direct rollover because it eliminates both problems. Ask your 401(k) plan administrator for the direct rollover form and provide your Roth IRA custodian's account details. The transfer usually takes one to two weeks.

The pro-rata rule and mixed contributions

If your 401(k) contains both pre-tax contributions (the usual case) and after-tax contributions (less common, but possible if you made non-deductible contributions), the IRS pro-rata rule applies. This rule says you cannot cherry-pick which dollars to convert. Instead, you must treat the conversion proportionally.

For example: suppose your 401(k) has $40,000 in pre-tax money and $10,000 in after-tax money, for a total of $50,000. If you convert $25,000 to a Roth, the IRS treats it as 80% pre-tax ($20,000) and 20% after-tax ($5,000). You pay tax only on the $20,000 pre-tax portion. You cannot convert only the $10,000 after-tax portion to avoid the tax bill.

This rule applies across all your IRAs and 401(k)-type plans combined. If you have a traditional IRA with $100,000 in pre-tax money and a 401(k) with $10,000 in after-tax money, the pro-rata calculation includes both accounts. This is one reason some people move their traditional IRA balance to their employer's 401(k) plan before doing a Roth conversion — it can lower the proportion of pre-tax money subject to the pro-rata rule. Check with your 401(k) plan to see if it accepts incoming rollovers from IRAs.

Tax consequences and the year of conversion

The tax bill for a Roth conversion is due in the year you do the rollover. If you convert $50,000 in December 2024, you report that $50,000 as taxable income on your 2024 tax return, filed in 2025. The amount you owe depends on your tax bracket that year.

This can push you into a higher tax bracket or trigger other tax consequences. For instance, if you are receiving Social Security, a large Roth conversion can increase your provisional income and cause more of your benefits to become taxable. If you are self-employed, it can affect your Medicare premiums (which are based on income from two years prior). Run the numbers with a tax professional before you convert, especially if the amount is large.

One strategy some people use is a partial rollover: convert a portion of your 401(k) one year and the rest in a later year, spreading the tax bill across multiple years and potentially staying in a lower bracket each time. Your 401(k) plan administrator can process partial rollovers, and your Roth IRA custodian will accept them.

Age restrictions and the 60-day rule

Unlike traditional IRA-to-Roth conversions, there is no age limit on rolling a 401(k) to a Roth. You can do it at 25 or 75. However, if you are still employed and your plan allows it, some employers restrict in-service rollovers (rollovers while you are still working there). Check your plan documents or ask your HR department.

If you use an indirect rollover, the 60-day clock starts the moment you receive the check from your 401(k) plan. You must deposit the full amount into a Roth IRA within 60 calendar days. The IRS does not extend this important date for weekends or holidays. If you deposit on day 61, the entire amount is treated as a taxable withdrawal, and if you are under 59½, you also owe a 10% early withdrawal penalty on top of income tax. Direct rollovers bypass this risk entirely.

What happens to employer match and loan balances

If your 401(k) includes an employer match, that money is pre-tax and must be rolled over as pre-tax dollars. You cannot convert employer match to a Roth without paying tax on it (which is true of any pre-tax 401(k) balance). The pro-rata rule applies to the match just as it does to your own contributions.

If you have an outstanding loan against your 401(k), you cannot roll over the loan balance itself. You can roll over only the vested balance that remains after the loan is subtracted. If you leave your job while a loan is outstanding, the unpaid balance is typically treated as a taxable distribution (and subject to the 10% early withdrawal penalty if you are under 59½). Pay off the loan before you roll over, or understand that leaving it unpaid will trigger a tax bill.

Roth IRA contribution limits after a rollover

A rollover from a 401(k) to a Roth IRA does not count against your annual Roth contribution limit. The IRS treats rollovers separately from regular contributions. So if you roll over $50,000 in 2024, you can still contribute up to the annual limit (which varies by year and your age) to a Roth IRA in that same year.

However, the income tax you owe on the conversion is separate from the contribution limit. You pay tax on the full $50,000 converted, even though it does not reduce your contribution room.

Frequently Asked Questions

Can I roll a 401(k) to a Roth IRA if I am still working?

Yes, if your employer's 401(k) plan permits in-service rollovers. Not all plans allow this. Contact your HR or benefits department to ask whether you can roll over while still employed. If your plan does not allow it, you can roll over after you leave the job.

What if I have a Roth 401(k), not a traditional 401(k)?

A Roth 401(k) can be rolled into a Roth IRA without triggering a tax bill, because the money was already taxed when you contributed it. The rollover is straightforward: no pro-rata rule applies, and you owe no additional tax. This is one of the cleanest rollover scenarios.

Can I undo a Roth conversion if I change my mind?

Prior to 2018, you could recharacterize a conversion (undo it and move the money back). That option is no longer available. Once you convert to a Roth, the conversion is permanent. If the market drops after you convert and you regret it, you cannot reverse it. This is why some people convert smaller amounts or spread conversions across multiple years.

Do I have to convert the entire 401(k) balance?

No. You can roll over part of your 401(k) and leave the rest in the plan (if your employer allows) or roll the rest to a traditional IRA. Partial rollovers are common when people want to manage their tax bill or keep some money in a 401(k) for other reasons, such as the loan feature or lower investment fees.

What if my 401(k) is with a former employer?

You can roll over a 401(k) from a previous job to a Roth IRA at any time after you leave that employer. You do not have to wait until retirement. Contact the plan administrator of your old 401(k) and request a direct rollover to your Roth IRA custodian.