Yes, you can roll a 401(k) into a Roth IRA, but you will owe income tax on the amount you convert

A Roth conversion moves money from a traditional 401(k) into a Roth IRA. The mechanics are straightforward: your 401(k) administrator sends the funds to the Roth IRA custodian, and the money lands in your Roth account. The catch is that you must report the full amount as taxable income in the year you convert, and you pay ordinary income tax on it at your regular tax rate.

This is different from a regular rollover to a traditional IRA, where you move pre-tax money without triggering a tax bill. A Roth conversion is a taxable event by design — that is how the money becomes tax-free in the Roth account later.

You can do this conversion at any age and at any income level. Unlike Roth IRA contributions, which have income limits that phase out your ability to put money in directly, conversions have no income ceiling. This is why high-income earners often use conversions as a backdoor way to fund a Roth.

Key Takeaways

  • A Roth conversion requires you to pay income tax on the full amount converted in the year you do it, at your ordinary tax rate.
  • You can convert at any age and any income level, with no income limits blocking you the way they do for direct Roth contributions.
  • If you have other traditional IRAs or SEP IRAs, the IRS counts all of them together when calculating your tax bill, which can make conversions more expensive than you expect.
  • You must wait five years from the date of conversion before you can withdraw the converted amount tax-free, even if you are over 59½.
  • Once the money is in the Roth, it grows tax-free and you never have to take withdrawals during your lifetime.

How the tax bill works when you convert

When you convert $50,000 from your 401(k) to a Roth IRA, the IRS treats that $50,000 as income you received that year. If you are in the 24 percent federal tax bracket, you owe $12,000 in federal tax on the conversion. Some states also tax conversions, so your total bill could be higher.

The tax is due when you file your return for that year. You do not pay it upfront to the 401(k) administrator — you settle it with the IRS at tax time. Many people pay estimated taxes during the year to avoid a large bill in April, or they have their employer withhold extra from their paycheck.

The amount you convert pushes your income higher for that year, which can bump you into a higher tax bracket and affect other tax benefits you might otherwise receive. For example, if you are on the edge of a bracket, a large conversion could cost you more in tax than the conversion amount alone would suggest.

The pro-rata rule and why other IRAs matter

If you have a traditional IRA, a SEP IRA, or a SIMPLE IRA in addition to your 401(k), the IRS applies the pro-rata rule when you convert. This rule treats all your IRAs as one pool of money for tax purposes, even if they are at different banks or have different balances.

Here is how it works: suppose you have a traditional IRA with $100,000 in pre-tax contributions and a 401(k) with $50,000. You want to convert just the $50,000 from the 401(k) to a Roth. The IRS looks at your total IRA and 401(k) balance ($150,000), calculates what portion is pre-tax ($100,000 out of $150,000, or about 67 percent), and taxes 67 percent of your $50,000 conversion. You end up owing tax on roughly $33,400 instead of the full $50,000.

This rule catches many people off guard. If you are planning a conversion, add up all your traditional IRAs, SEP IRAs, and SIMPLE IRAs first. If the total is large, a conversion may cost more in tax than you expected. Some people open a Solo 401(k) or move IRA money back into a workplace 401(k) to avoid this rule, but that requires careful planning and is not available to everyone.

The five-year rule for converted funds

Money you convert to a Roth is subject to a separate five-year holding period. You cannot withdraw the converted amount tax-free until five years have passed from the date of conversion, even if you are over 59½ and would normally be allowed to take Roth withdrawals without penalty.

This rule applies only to the converted amount, not to contributions you make directly to the Roth or to earnings on any Roth money. If you convert $50,000 in January 2024, you can withdraw that $50,000 without tax or penalty starting in January 2029. If you need the money before then, you pay ordinary income tax on it, plus a 10 percent penalty if you are under 59½.

The five-year clock resets for each conversion you do. If you convert $20,000 in 2024 and another $20,000 in 2025, the first $20,000 is available tax-free in 2029 and the second in 2030.

When a Roth conversion makes sense

A conversion is often worth considering if you expect to be in a higher tax bracket later, or if you want to reduce the size of your traditional retirement accounts to lower your required minimum distributions in your 70s. It also makes sense if you have a year with unusually low income — a job loss, sabbatical, or early retirement before Social Security starts — because you will owe less tax on the conversion.

Some people convert small amounts every year to spread the tax bill across multiple years and stay in a lower bracket. Others convert a large amount in a single year if they are in a low-income year. The math depends on your specific situation, your current tax bracket, and what you expect your bracket to be in retirement.

A conversion also locks in current tax rates. If you believe tax rates will rise in the future, converting now at today's rates may save you money over your lifetime. This is a judgment call, not a certainty, but it is part of the reasoning many people use.

Steps to convert your 401(k) to a Roth IRA

First, contact your 401(k) plan administrator and ask about a direct rollover to a Roth IRA. Provide the name and account number of the Roth IRA you want the money to go to. The administrator will send the funds directly to the Roth custodian, which is the cleanest route and avoids the 60-day rollover rule.

If your plan does not allow direct rollovers to a Roth, ask for a check made payable to your Roth IRA custodian. Do not have the check made out to you — if it is, the IRS may treat it as a taxable distribution rather than a rollover. You then deposit the check with your Roth custodian within 60 days.

Once the money lands in your Roth, report the conversion on your tax return using Form 8606. This form tells the IRS the amount you converted, the amount that is taxable (which may be less than the full conversion if you have other IRAs), and the amount of tax you owe. Your tax software or preparer can help you complete this form.

What happens if you leave your job

If you are leaving your job or retiring, you may have the option to roll your 401(k) to a Roth IRA as part of your exit. Some plans allow in-service conversions while you are still employed, but most require you to leave the job first. Check with your plan administrator about the timing and rules for your specific plan.

If your 401(k) balance is small, you might also receive a lump-sum distribution. The plan will withhold 20 percent for federal taxes automatically, and you have 60 days to roll the remaining amount into a Roth IRA. The withheld 20 percent is treated as a taxable distribution unless you replace it from your own funds within the 60-day window — a detail that trips up many people.

Frequently Asked Questions

Do I have to convert my entire 401(k) at once?

No. You can convert part of your 401(k) and leave the rest in the plan or roll it to a traditional IRA. You can also do multiple conversions over several years. Each conversion is a separate taxable event, so you can spread the tax bill across multiple years if that makes sense for your situation.

What if I convert and then the market drops?

You still owe tax on the full amount you converted, even if the value drops afterward. However, you can undo a conversion within a certain window using a process called a recharacterization, though this option has strict timing rules. Talk to a tax professional if the market moves significantly after your conversion.

Can I convert if I am still working?

It depends on your plan. Some 401(k) plans allow in-service conversions to a Roth while you are still employed. Others only allow conversions after you leave the job. Check your plan documents or ask your HR department whether your plan permits this.

Will a Roth conversion affect my Social Security benefits?

A conversion counts as income for the year you do it, which could affect your Social Security taxation if you are already receiving benefits. The impact depends on your total income that year. If you are close to the income thresholds where Social Security becomes taxable, a large conversion might push you over the edge.

What if I have a Roth 401(k) instead of a traditional 401(k)?

You can roll a Roth 401(k) directly to a Roth IRA with no tax consequences, since the money is already after-tax. This is a straightforward rollover, not a conversion. Contact your plan administrator to set up a direct rollover to your Roth IRA custodian.