401(k) to Roth IRA Rollover: What to Know

A 401(k) to Roth IRA rollover moves money from a workplace plan into a Roth IRA. Pretax dollars in that move are usually taxable in the year they arrive. The account can then grow, and qualified withdrawals can be tax-free later. That is a different question from choosing between a Roth IRA and a traditional IRA while you are still contributing.

You deserve a clear view of the tax bill before you request the check. We believe the useful decision is not whether a Roth sounds appealing. It is whether this year's income can absorb the converted amount without crowding out the rest of your plan. A direct rollover, paid to the new IRA, avoids the 20 percent withholding that applies when the plan pays you.

Call (704) 947-8444 to review a 401(k) to Roth IRA rollover

What a 401(k) to Roth IRA Rollover Actually Does

A rollover takes an eligible distribution from one retirement plan and puts it into another. The IRS says the transaction is reportable even when it is not taxable. A move from a pretax 401(k) into a Roth IRA is the exception people feel in April. The pretax portion is taxable because a Roth IRA is funded with after-tax money.

Think of the workplace plan as the source and the Roth IRA as the destination. The investments can stay similar. The tax character changes. Dollars that would have been taxed on the way out of a traditional account are taxed on the way in. Later qualified withdrawals from the Roth IRA are generally tax-free.

Our Roth IRA guide already explains how a Roth IRA differs from a traditional IRA, including contribution rules and qualified withdrawals. Use that page for the account comparison. This page stays on the workplace-plan move: when you can do it, what becomes taxable, and how to avoid a withholding surprise.

You should also separate this from leaving the job. Ending employment often makes the balance eligible to move, but the tax result depends on the destination. A rollover to a traditional IRA can stay tax-deferred. A rollover to a Roth IRA generally does not.

Direct Rollover Versus a 60-Day Check

The IRS describes three ways to complete a rollover. For a 401(k), two of them matter most.

A direct rollover asks the plan administrator to pay the new Roth IRA, or to issue a check payable to that IRA for your benefit. No tax is withheld from that transfer. You still report the taxable amount, but the full balance can arrive in the Roth IRA.

A 60-day rollover is different. If the plan pays you, you generally have 60 days from receipt to deposit the money in another eligible plan. On an eligible rollover distribution paid to you, the payer must withhold 20 percent unless you elected a direct rollover. To roll over the full distribution, you have to replace the withheld amount from other savings. The withheld tax is not a fee. It is a prepayment you reconcile on your return, but the cash is gone until then.

That is why we prefer the direct path for a 401(k) to Roth IRA rollover. Replacing 20 percent of a large balance from a checking account is a cash-flow decision, not a paperwork detail. If you miss the 60 days, the withheld amount and the rest of the distribution can become taxable, and an early-distribution penalty may apply if you are under 59 1/2 and no exception fits.

1. Confirm the plan will allow the distribution, including any in-service rule if you are still employed.
2. Open or identify the Roth IRA that should receive the money.
3. Request a direct rollover payable to the Roth IRA custodian, not to you.
4. Ask for a split if you want only part of the pretax balance to be taxable this year.
5. Set aside cash for the tax on the pretax amount. Do not plan to withhold that tax from the rollover itself.

What Is Taxable, and What Is Not

Most employee deferrals and employer matches in a traditional 401(k) are pretax. Rolling those dollars to a Roth IRA adds them to your taxable income. Roth 401(k) contributions have already been taxed. Rolling those designated Roth dollars to a Roth IRA is generally not taxed again, as long as the rollover is done correctly. After-tax, non-Roth contributions are also generally not taxed again. Their earnings often are.

The IRS also lists amounts that cannot be rolled over at all. A required minimum distribution is one. A hardship distribution is another. So are certain corrective distributions of excess contributions, and the cost of life insurance inside a plan. If you are old enough that the plan must pay an RMD, that RMD has to come out before any rollover of the remaining balance.

A partial rollover is allowed. You can move part of an eligible balance to a Roth IRA and leave the rest in the plan, or send the rest to a traditional IRA. The taxable amount is the pretax portion that lands in the Roth IRA. People with large balances often use a partial amount so the tax stays inside a bracket they have chosen on purpose.

The IRS rollover topic is the source for which distributions are eligible and for the rule that a rollover to a Roth IRA from another type of plan is taxable. Read the plan's own distribution form too. The form names the payee line that makes a rollover direct.

How This Differs From a Contribution or a Backdoor Roth

An annual IRA contribution and a rollover do not share a dollar limit. For 2026, the IRS raised the IRA contribution limit to $7,500, with a catch-up of $1,100 for people age 50 and older. A 401(k) to Roth IRA rollover can be far larger than that, because it is moving existing savings rather than adding new annual savings. It also does not use the Roth IRA income limit that blocks direct contributions.

A backdoor Roth is another path entirely. It is a nondeductible traditional IRA contribution followed by a conversion, used when income is too high for a direct Roth IRA contribution. Our backdoor Roth IRA guide covers that sequence, including the pro-rata rule. Do not use those steps to describe a 401(k) rollover. The workplace plan is the source, and the taxable amount is the pretax balance you choose to move.

A conversion of an IRA you already own is closer in tax result, but it is still a different transaction. There is no 20 percent mandatory withholding on a typical IRA conversion, and the once-per-year IRA-to-IRA rollover limit does not apply to trustee-to-trustee transfers. If the money is still inside an old 401(k), start with the plan administrator, not with an IRA conversion form.

When the Rollover Fits a High-Balance Plan

The rollover can fit when you have cash outside the account to pay the tax, and when a higher income year will not undo a larger goal. A low-income year, a gap between jobs, or a year before Social Security and RMDs begin can be a better window than a peak earning year. You should look at the whole return, not just the rollover line.

IRMAA is one reason. Medicare income-related surcharges look back at modified adjusted gross income. A large taxable rollover can raise premiums two years later. Charitable plans, a home sale, or stock option income in the same year can stack on top of it. Our RMD planning guide explains why the years before required distributions are often the planning window, not the year the RMD starts.

Future withdrawal order matters too. Adding Roth dollars can give you a tax-free bucket beside taxable and tax-deferred accounts. That flexibility is the point of tax-efficient withdrawal sequencing. It is not a reason to convert a balance you may need to spend within five years, because the tax comes due now and the Roth holding period may not be finished.

If you are still working, ask whether the plan allows an in-service distribution. Many plans do not let you roll out elective deferrals while you are employed and under 59 1/2. Employer contributions can have a different rule. A planner can read the plan's summary with you so the request matches what the administrator will actually process.

Timing, Age, and the Five-Year Clock

Qualified Roth IRA withdrawals generally require two things. You must be 59 1/2, disabled, or meet another qualifying reason, and the Roth IRA must satisfy the five-year rule. A rollover from a designated Roth account can carry its own five-year start. A rollover of pretax 401(k) money starts from the Roth IRA's five-year period. If this is your first Roth IRA, that clock starts in the year the rollover contribution is made.

Leaving the money in the Roth IRA past that period is what makes the upfront tax worthwhile for many families. Pulling it out early can mean tax on earnings plus a penalty, which defeats the reason you paid tax to get it there. If you might need the cash soon, a traditional IRA rollover, or simply leaving the 401(k) in place, may be the calmer choice.

Inherited accounts follow different rules. A spouse has options a non-spouse beneficiary does not. Our inherited IRA guide covers those distribution deadlines. Do not assume a beneficiary can repeat the same 401(k) to Roth IRA rollover you could have made while you were alive.

How We Would Review the Decision

We would start with the plan statement, not a target percentage to convert. The statement should separate pretax deferrals, Roth deferrals, employer money, and any after-tax basis. Then we would estimate the federal and state tax on the slice you might move, and compare that with the bracket you expect in retirement.

Next we would check cash. The tax should be payable from money outside the rollover. Using rollover dollars to pay the tax shrinks what reaches the Roth IRA and can create an early-distribution penalty. We would also look at Medicare premiums, charitable giving, and the withdrawal plan so one year's tax choice does not fight the next decade of income.

Tax planning and income planning belong in the same conversation. A Roth rollover changes both this year's return and the paycheck you can draw later. If you also hold a SEP IRA or a solo 401(k), read the SEP IRA and solo 401(k) comparison before you move a workplace plan. Those accounts have their own contribution and rollover paths.

You should keep the plan's confirmation and Form 1099-R. The form reports the distribution and whether it was a direct rollover. Your tax preparer needs it even when part of the amount is not taxable. If the form code does not match what you requested, ask the administrator before you file.

Call (704) 947-8444 to talk through your 401(k) rollover