Yes, you can convert a 401(k) to a Roth IRA, but the process depends on whether you still work for the company that sponsors your plan

A Roth conversion moves money from your 401(k) into a Roth IRA. The key difference: you pay income tax on the amount you convert in the year you do it, but then that money grows tax-free and you can withdraw it tax-free in retirement. With a regular 401(k), you pay tax when you take the money out later.

If you are still employed at the company sponsoring your 401(k), you usually cannot convert it yet — most plans do not allow in-service conversions. Once you leave the job, retire, or turn 59½, you can roll the money into a Roth IRA. If your plan does allow in-service conversions, your plan administrator can tell you whether yours does.

The conversion itself is straightforward: you contact your 401(k) plan administrator or custodian, request a direct rollover to a Roth IRA, and they send the money to the Roth IRA custodian you choose. You then owe federal income tax on the full amount converted that tax year.

Key Takeaways

  • You can convert a 401(k) to a Roth IRA after you leave your job, retire, or reach age 59½, or if your plan allows in-service conversions while you are still employed.
  • You must pay income tax on the entire amount you convert in the year you do the conversion, calculated at your ordinary income tax rate.
  • A direct rollover from your 401(k) custodian to your Roth IRA custodian avoids the 60-day rule and withholding complications.
  • Your income does not limit whether you can do a Roth conversion, though it affects how much tax you owe on the conversion.
  • After conversion, the money in your Roth IRA grows tax-free and you can withdraw earnings penalty-free after age 59½ and five years of Roth ownership.

When you can convert: employment status and age rules

The timing of a conversion depends on your employment situation. If you are still working for the company that sponsors your 401(k), you cannot convert unless your specific plan document allows in-service conversions. Contact your plan administrator or check your plan summary to find out. Many plans do not offer this option.

Once you leave the job for any reason — resignation, layoff, or retirement — you can convert when ready. You do not have to wait until you reach a certain age. If you are still employed but turn 59½, some plans allow you to convert at that age even while working there, though this varies by plan.

If you are already retired or separated from service, there are no age restrictions on when you can convert. You can do it at 50, 65, or any other age.

How the tax bill works when you convert

When you convert, you owe federal income tax on the full amount you move to the Roth IRA. The IRS treats the conversion as a taxable distribution from your 401(k). The tax is calculated at your ordinary income tax rate for that year, not at a special conversion rate.

For example, if you convert $50,000 and you are in the 24% federal tax bracket, you owe roughly $12,000 in federal income tax on that conversion. You may also owe state income tax depending on where you live. This tax is due when you file your tax return for the year of the conversion.

The tax bill can be substantial, so many people convert smaller amounts over multiple years to spread the tax across different tax years. There is no limit on how many conversions you can do or how much you can convert in total, but each conversion triggers a tax bill that year.

Direct rollover versus 60-day rollover: which route to use

There are two ways to move the money: a direct rollover and a 60-day rollover. A direct rollover is simpler and safer. You instruct your 401(k) custodian to send the money directly to your Roth IRA custodian. The money never touches your hands, and there is no withholding or 60-day important date to worry about.

A 60-day rollover means your 401(k) custodian sends you a check. You then have 60 days to deposit it into your Roth IRA. If you miss the important date, the IRS treats it as a withdrawal, and you owe tax plus a 10% penalty if you are under 59½. Your custodian may also withhold 20% of the amount for federal taxes, which you have to make up from your own funds to complete the rollover.

Direct rollover avoids these complications. Request it by name when you contact your 401(k) plan administrator.

The pro-rata rule: what happens if you have other IRAs

If you have a traditional IRA, SEP IRA, or straightforward IRA in addition to your 401(k), the pro-rata rule affects your conversion. When you convert, the IRS treats all your traditional IRAs and the 401(k) as one pool for tax purposes. You cannot convert only the pre-tax money and leave the after-tax money behind.

Here is how it works: if you have $100,000 in traditional IRAs and $50,000 in after-tax contributions in your 401(k), and you convert $50,000 from the 401(k), the IRS calculates what percentage of your total is after-tax. In this case, $50,000 out of $150,000 is after-tax, or about 33%. So only about $16,500 of your $50,000 conversion is tax-free; the rest is taxable.

If you have significant after-tax money in a 401(k) and want to convert it without a large tax bill, talk to a tax professional before you convert. Some people use a strategy called a backdoor Roth combined with a 401(k) rollover to minimize the pro-rata impact, but this requires careful planning.

What happens to employer match and vesting

If your 401(k) contains employer match money, that money is fully vested and can be converted along with everything else. There is no special rule that prevents you from converting matched funds. The entire balance — your contributions, employer match, and investment gains — can all go into the Roth IRA.

Vesting does not affect conversions. Once you leave the company or reach the conversion trigger (like age 59½), any unvested balance becomes vested automatically, and you can convert it. If you are still employed and your plan allows in-service conversions, you can only convert vested amounts unless your plan document says otherwise.

Income limits and Roth IRA conversion rules

Unlike direct contributions to a Roth IRA, which have income limits, there is no income limit on Roth conversions. You can earn $500,000 a year and still convert a 401(k) to a Roth IRA. This is one reason high-income earners use conversions to get money into Roth accounts when they cannot contribute directly.

However, your income does affect how much tax you owe on the conversion. Higher income in the conversion year means you may be in a higher tax bracket, so the conversion costs more in taxes. Some people time their conversions for years when their income is lower — for instance, the year they retire before they start taking Social Security or pension payments.

After the conversion: withdrawal rules and the five-year clock

Once money is in your Roth IRA, it follows Roth rules. You can withdraw your contributions (the amount you converted) at any time without tax or penalty. Earnings on that money are different: you can withdraw earnings tax-free only if you are 59½ or older and the money has been in a Roth IRA for at least five years.

The five-year rule is per Roth IRA account, not per conversion. If you open a new Roth IRA and convert money into it, the five-year clock starts that year. If you already have a Roth IRA and convert into it, the five-year period may have already started from your first Roth contribution or conversion.

If you withdraw earnings before age 59½ and before five years have passed, you owe income tax on the earnings plus a 10% penalty. Contributions can always come out penalty-free.

Frequently Asked Questions

Can I convert my 401(k) while I am still working?

Only if your plan allows in-service conversions. Contact your plan administrator to ask. If it does not, you must wait until you leave the job, retire, or turn 59½ (depending on your plan). Once you separate from service, you can convert when ready.

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

No. You can convert part of it and leave the rest in the 401(k) or roll the rest into a traditional IRA. Many people convert smaller amounts over several years to spread the tax bill across multiple years and potentially stay in a lower tax bracket each year.

What if I cannot afford the tax bill on the conversion?

You can pay the tax from other savings or from your paycheck. Do not take the tax money from the 401(k) itself — that would reduce the amount converted and create an additional tax bill. If the tax bill is too large, convert a smaller amount or wait until a year when your income is lower.

Can I undo a conversion if I change my mind?

You can recharacterize a conversion — move the money back to a traditional IRA — but only within certain time limits and with specific IRS forms. Tax rules on recharacterization change, so consult a tax professional if you need to reverse a conversion.

Will a conversion affect my Social Security or Medicare benefits?

A Roth conversion increases your taxable income for that year, which could affect Social Security taxation or Medicare premiums. If you are close to income thresholds for these programs, talk to a tax professional before converting to understand the full impact.