Yes, you can convert a 401(k) to a Roth IRA, but the process and tax bill depend on your employment status and the type of 401(k) you have

A 401(k) conversion means moving money from your employer's retirement plan into a Roth IRA in your own name. The IRS allows this, but you will owe income tax on the amount you convert in the year you move it. The conversion itself is straightforward — your 401(k) provider and your Roth IRA custodian handle most of the paperwork — but the tax consequences are real and worth understanding before you start.

The main rule: you can only convert a 401(k) to a Roth if you no longer work for the employer that sponsors the plan. If you still work there, most plans do not allow it. If you have left the job, or if you are converting an old 401(k) from a previous employer, you can move forward.

Key Takeaways

  • You can convert a 401(k) to a Roth IRA only after you leave the employer that sponsors the plan, or if you are converting an old 401(k) from a previous job.
  • You will owe federal income tax on the full amount you convert in the year of the conversion, calculated at your ordinary income tax rate.
  • The conversion process takes a few weeks and involves your 401(k) provider sending money directly to your Roth IRA custodian.
  • Some people convert in years when their income is lower to reduce the tax bill, or convert in smaller amounts over multiple years.
  • Once money is in the Roth IRA, it grows tax-free and you can withdraw earnings penalty-free after age 59½ and five years of Roth ownership.

When you can and cannot convert

The timing of a conversion depends on your employment status. If you are still employed by the company that sponsors your 401(k), most plans do not permit a conversion to a Roth. You would need to wait until you leave the job, retire, or reach age 59½ — some plans allow conversions at 59½ even while you are still working, but this is not standard.

If you have already left the job, you can convert at any time. This includes 401(k)s from previous employers that you have not touched in years. There is no important date to convert an old 401(k), though the longer money sits in a traditional 401(k), the more it grows and the larger your tax bill will be if you eventually convert.

If you are self-employed or own a small business, you may have a Solo 401(k) or SEP-IRA. These plans have different rules, and some allow in-service conversions even while you are still working. Check with your plan administrator or a tax professional about your specific plan type.

Understanding the tax bill

When you convert a 401(k) to a Roth IRA, the IRS treats the money as income in that tax year. If you convert $50,000, you will owe income tax on $50,000 as if you earned it as wages. The tax rate depends on your tax bracket — the higher your income that year, the higher your rate.

This tax is due when you file your return the following spring. You do not pay it upfront, but you need to plan for it. Many people set aside money from their regular paycheck or savings to cover the tax bill, rather than using money from the conversion itself.

Some people use a strategy called dollar-cost conversion, where they convert smaller amounts over several years instead of one large amount. This spreads the tax bill across multiple years and may keep you in a lower tax bracket each year. For example, instead of converting $100,000 in one year, you might convert $25,000 per year for four years.

The step-by-step conversion process

Start by opening a Roth IRA if you do not already have one. You can open one with any bank, brokerage, or investment firm — Fidelity, Vanguard, Charles Schwab, and many others offer them. You will need your Social Security number and basic personal information.

Next, contact your 401(k) plan administrator or log into your plan's website and request a conversion. Tell them you want to convert to a Roth IRA and provide your new Roth IRA account details (the custodian's name, your account number, and routing information). Some plans call this a "direct rollover" or "trustee-to-trustee transfer."

The 401(k) provider will send the money directly to your Roth IRA custodian. This usually takes one to three weeks. Do not take the money yourself — if the money comes to you first, it becomes a taxable distribution and may trigger early withdrawal penalties if you are under 59½.

Once the money arrives in your Roth IRA, you will receive a confirmation from your Roth custodian. You will also receive tax forms (a 1099-R from your 401(k) plan and possibly a 5498 from your Roth custodian) that you will use when filing your tax return.

What happens to loans and employer match

If you have an outstanding loan against your 401(k), you cannot convert that portion. You must repay the loan first, or it will be treated as a taxable distribution. If you leave your job while a loan is outstanding, the loan typically becomes due within 60 days.

Employer match money in your 401(k) can be converted, but it is treated the same as your own contributions — you will owe tax on it. Some people choose to convert only their own contributions and leave the employer match in the 401(k) or roll it into a traditional IRA to minimize the tax bill.

Pro-rata rule and pre-tax money

If you have money in both a traditional IRA and a 401(k), the IRS has a rule called the pro-rata rule that affects conversions. When you convert, the IRS looks at all your traditional IRAs and pre-tax 401(k) money combined, not just the account you are converting. This can increase your tax bill unexpectedly.

For example, if you have $10,000 in a traditional IRA and want to convert $50,000 from a 401(k), the IRS treats the conversion as if 17% of it ($8,500) comes from pre-tax money and 83% ($41,500) comes from after-tax contributions. You would owe tax on the full $50,000, not just the after-tax portion. This rule does not explore if you have no other traditional IRAs or pre-tax retirement accounts.

If you are concerned about the pro-rata rule, talk to a tax professional before converting. Some people roll their traditional IRA into their employer's 401(k) plan first to avoid the rule, though not all plans allow this.

After the conversion: what you can do with the money

Once money is in your Roth IRA, it grows tax-free. You can invest it in stocks, bonds, mutual funds, or other investments just like any other Roth IRA. The big advantage is that when you withdraw the money in retirement, you will not owe tax on the growth.

You can withdraw your contributions (the amount you converted) at any time without penalty or tax. However, you cannot withdraw the earnings (the growth) until you are 59½ and have owned the Roth for at least five years. If you withdraw earnings before then, you will owe tax and a 10% penalty on the earnings portion.

The five-year rule applies to each conversion separately. If you convert in 2024 and again in 2025, each conversion has its own five-year clock. You can withdraw contributions from the 2024 conversion anytime, but earnings from that conversion cannot come out penalty-free until 2029.

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 into a traditional IRA. Some people convert in stages over several years to spread out the tax bill. Each conversion is treated separately for tax purposes.

What if I change my mind after converting?

You can undo a conversion by doing a recharacterization, but only within certain time limits. You must recharacterize by the tax filing important date (usually April 15 of the following year, plus extensions). After that important date, the conversion is permanent. Recharacterization moves the money back to a traditional IRA and reverses the tax consequences.

Can I convert if I am still working but at a different job?

Yes. You can convert a 401(k) from a previous employer even if you are currently employed elsewhere. The rule is that you cannot convert while you are still employed by the company that sponsors that specific 401(k) plan.

Will converting a 401(k) to a Roth affect my Social Security benefits?

The conversion itself does not directly affect Social Security, but the income from the conversion counts toward your total income for that year. If your income crosses certain thresholds, it could trigger taxation of your Social Security benefits. This is a complex calculation — consider talking to a tax professional if you are close to retirement.

What if my 401(k) has after-tax contributions?

After-tax contributions (money you put in beyond the annual limit) can be converted to a Roth with little or no tax owed on that portion, since you already paid tax on it. However, the pro-rata rule still applies to any pre-tax money in your accounts. Separating after-tax from pre-tax money requires careful planning and documentation.