Moving Money From an IRA to Your 401(k): What You Need to Know

Yes, you can roll an IRA into a 401(k), but your plan has to allow it and your IRA has to meet specific requirements

A rollover moves money from one retirement account to another without triggering taxes or penalties, as long as you follow the rules. You can move money from a traditional IRA into a 401(k) if three things are true: your 401(k) plan document permits IRA rollovers, you roll a traditional IRA (not a Roth IRA, with rare exceptions), and you complete the transfer within 60 days or use a direct trustee-to-trustee transfer.

The most common reason to do this is to consolidate accounts after leaving a job, or to move money into a workplace plan that offers better investment options or lower fees. Some people also roll IRAs into 401(k)s to simplify their retirement picture or to take advantage of a 401(k)'s loan provisions, which IRAs do not have.

The process itself is straightforward, but the rules around which money can move and which accounts accept rollovers are strict. Getting the details wrong can cost you in taxes and penalties.

Key Takeaways

Your 401(k) plan must explicitly allow IRA rollovers — check your plan documents or ask your plan administrator before you start.
You can roll a traditional IRA into a traditional 401(k), but rolling a Roth IRA into a 401(k) is only possible if your plan accepts Roth contributions and you roll it into a designated Roth account.
A direct trustee-to-trustee transfer is safer than a 60-day rollover because the money never touches your hands and there is no risk of missing the important date.
If you have after-tax contributions in your IRA, only the earnings portion can roll over; the contributions themselves may be subject to pro-rata tax rules.
Once money lands in your 401(k), you cannot move it back to an IRA — rollovers are one-way from IRA to 401(k).

Check whether your 401(k) plan accepts IRA rollovers

Not every 401(k) plan allows rollovers from IRAs. Your employer's plan document — the legal agreement that governs how the plan works — either permits them or it does not. If it does not, you cannot move the money, even if you want to.

Contact your plan administrator (usually your HR department or benefits team) and ask directly: "Does this plan accept rollovers from traditional IRAs?" They can tell you yes or no in one conversation. If the answer is no, you are done — you cannot proceed. If the answer is yes, move to the next step.

Some plans accept rollovers but have restrictions — for example, they may accept rollovers only from employer plans (like old 401(k)s or 403(b)s), not from IRAs. Ask for the specific rules that explore to your situation.

Understand the difference between traditional and Roth rollovers

A traditional IRA can roll into a traditional 401(k) with no tax consequences. The money moves pre-tax to pre-tax, and nothing changes about your tax situation in the year of the rollover.

A Roth IRA is more complicated. Most 401(k) plans do not accept Roth IRA rollovers at all. If your plan does accept them, it must have a designated Roth account (sometimes called a Roth 401(k) option), and the money rolls into that Roth portion, not the traditional portion. This is rare — check your plan documents or ask your administrator whether a Roth rollover is even possible before you assume it is.

If you have both traditional and Roth IRAs and want to roll only the Roth, you must keep them separate. You cannot combine them into one rollover. Work with your IRA custodian and your 401(k) plan administrator to make sure each piece goes to the right place.

Choose between a direct transfer and a 60-day rollover

There are two ways to move the money: a direct trustee-to-trustee transfer or a 60-day rollover. The direct transfer is simpler and safer.

In a direct transfer, you instruct your IRA custodian (the bank or brokerage holding your IRA) to send the money directly to your 401(k) plan. The money never comes to you. There is no 60-day clock, no tax withholding, and no risk of missing a important date. This is the method most financial advisors recommend.

In a 60-day rollover, your IRA custodian sends you a check or deposits the money into your personal bank account. You then have 60 calendar days to deposit that money into your 401(k). If you miss the important date, the IRS treats it as a withdrawal, and you owe income tax on the full amount plus a 10% early withdrawal penalty if you are under 59½. You also cannot do more than one IRA-to-IRA rollover in a 12-month period, though this rule does not explore to rollovers from an IRA into a 401(k).

If you choose the 60-day method, mark your calendar and set a reminder. The clock starts the day you receive the money, not the day you request the rollover.

Handle the pro-rata rule if you have after-tax IRA contributions

If your IRA contains both pre-tax money (deductible contributions and earnings) and after-tax money (non-deductible contributions), the IRS applies the pro-rata rule. This rule says you cannot pick and choose which dollars roll over — you must roll over a proportional mix of pre-tax and after-tax money.

Here is how it works: Add up all your traditional IRAs, SEP IRAs, and straightforward IRAs (not Roth IRAs). Calculate what percentage is pre-tax and what percentage is after-tax. When you roll over money, that same percentage applies to the rollover. If 80% of your total IRA balance is pre-tax and 20% is after-tax, then 80% of your rollover is pre-tax and 20% is after-tax.

The after-tax portion that rolls over is not taxed again. However, if you have after-tax contributions that you want to keep separate or convert to a Roth, rolling over your IRA can complicate that strategy. Talk to a tax professional before you roll if you have a mix of pre-tax and after-tax money in your IRAs.

Complete the rollover and confirm it posted to your 401(k)

Once you have chosen your method and confirmed your plan accepts the rollover, contact your IRA custodian and request the transfer. If you are doing a direct transfer, provide them with your 401(k) plan's name, account number, and the custodian or administrator's mailing address. They will send the money directly.

If you are doing a 60-day rollover, ask your custodian to send you the check or initiate the deposit. Write down the date you receive the money — that is day one of your 60-day window.

After the money arrives at your 401(k), log into your plan's website or call your plan administrator to confirm the deposit posted to your account. This usually takes one to two weeks after the money is sent. Do not assume it arrived just because you sent it. Verify the amount matches what you rolled over.

Know what you cannot do after the rollover

Once money is in your 401(k), you cannot roll it back to an IRA. Rollovers from IRA to 401(k) are one-way. If you change your mind later, your only option is to wait until you leave the job or reach age 59½, then roll the 401(k) money into an IRA at that time.

You also cannot roll over money that is already in your 401(k) into an IRA and then back into the same 401(k) to reset the clock on the 60-day rule or avoid the pro-rata rule. The IRS watches for this and will disallow the rollover.

If your 401(k) plan changes or is terminated, your plan administrator will tell you what happens to rolled-over money. In most cases, you can roll it to another 401(k) or to an IRA at that time.

Frequently Asked Questions

Can I roll a Roth IRA into a 401(k)?

Only if your 401(k) plan has a designated Roth account and explicitly allows Roth rollovers. Most plans do not. If your plan does not offer this option, you cannot roll a Roth IRA into it. Check your plan documents or ask your administrator.

What happens if I miss the 60-day important date?

The IRS treats the money as a withdrawal, not a rollover. You owe income tax on the full amount and a 10% early withdrawal penalty if you are under 59½. The only exception is if you can show the IRS that you missed the important date due to circumstances beyond your control, which requires filing a formal request for relief.

Do I have to roll over my entire IRA, or can I roll over just part of it?

You can roll over a partial amount. However, if you have after-tax contributions in your IRA, the pro-rata rule still applies to the portion you roll over. You cannot use a partial rollover to avoid the pro-rata calculation.

Will rolling an IRA into my 401(k) affect my taxes this year?

A rollover of a traditional IRA into a traditional 401(k) does not trigger any tax in the year of the rollover. The money remains pre-tax in both accounts. You only pay tax when you withdraw the money in retirement.

Can I roll my 401(k) from an old job into an IRA and then into my new employer's 401(k)?

Yes. You can roll an old 401(k) into a traditional IRA, then roll that IRA into your new 401(k), as long as your new plan accepts IRA rollovers. However, if you have after-tax contributions in the old 401(k), rolling through an IRA triggers the pro-rata rule, which can create unexpected taxes. Consider a direct rollover from the old 401(k) to the new one instead.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.