Yes, you can roll a 401(k) into a 403(b), but the rules depend on whether you still work for your old employer

A 401(k) rollover into a 403(b) is possible, but it is not automatic. If you have left your job, you can move the money directly from your 401(k) plan to a 403(b) at your new employer or to an IRA. If you still work for the employer that sponsors your 401(k), you cannot touch that money until you leave the job or reach age 59½. The receiving 403(b) plan must also accept rollovers — not all of them do.

The key difference from other transfers is that a 401(k) and a 403(b) are sponsored by different types of employers. A 401(k) is a retirement plan offered by for-profit companies. A 403(b) is offered by schools, nonprofits, hospitals, and government agencies. The IRS allows money to move between them, but each plan has its own rules about what it will accept.

Key Takeaways

  • You can roll a 401(k) into a 403(b) only after you leave the job where you earned the 401(k), unless your plan allows in-service rollovers.
  • A direct rollover (where the 401(k) custodian sends money straight to the 403(b) plan) avoids taxes and penalties.
  • The 403(b) plan you want to roll into must have a rollover provision in its plan documents — you need to confirm this before you leave your old job.
  • If the 403(b) does not accept rollovers, you can roll the 401(k) into a traditional IRA instead and later roll it into a 403(b) if that plan changes its rules.
  • Rollovers do not count toward annual contribution limits, so you can move the full balance regardless of how much you earn that year.

When you can roll over a 401(k) to a 403(b)

The timing depends on your employment status. If you have left your job, you can roll the 401(k) to a 403(b) at any time. Your old employer's plan administrator will process the request once you ask for it. There is no important date — you can wait months or years, though the longer you wait, the more you may miss out on investment growth.

If you still work for the company that sponsors your 401(k), you cannot roll it over unless your plan document includes an in-service rollover provision. Some plans allow this; many do not. You would need to contact your plan administrator or HR department to find out. Even if your plan allows in-service rollovers, you may only be able to roll over certain portions of your balance, such as contributions you made before a certain date.

Once you leave the job, the door opens. You can roll the full balance to a 403(b) or to an IRA. There is no time limit, though some employers require you to request the rollover within a certain window after separation — check your plan documents or ask HR before you leave.

Direct rollover versus indirect rollover

A direct rollover is the safer route. You ask your 401(k) plan administrator to send the money directly to the 403(b) plan. The check goes from one institution to the other, and you never touch it. No taxes are withheld, and there are no penalties. This is the method the IRS prefers.

An indirect rollover means the 401(k) plan sends the money to you, and you deposit it into the 403(b) yourself. The IRS withholds 20 percent for federal income tax. You then have 60 days to deposit the full amount (including the withheld 20 percent) into the 403(b), or the money counts as a distribution and you owe income tax plus a 10 percent penalty if you are under 59½. Most people choose a direct rollover to avoid this risk.

If you do receive an indirect rollover and want to avoid the tax hit, you can deposit the withheld amount from your own funds within the 60-day window. The withheld amount will be refunded to you when you file your tax return, but you have to cover it upfront.

Confirming the 403(b) will accept the rollover

Not every 403(b) plan accepts rollovers from 401(k)s. Before you leave your job, contact the HR or benefits department at your new employer and ask whether their 403(b) plan accepts rollovers. They can tell you yes or no and provide the plan's rollover procedures. If they say no, you have other options.

If the 403(b) does not accept rollovers, you can roll the 401(k) into a traditional IRA instead. An IRA is a retirement account you open on your own, and most financial institutions offer them. Once the money is in an IRA, you can later roll it into a 403(b) if that plan's rules change, or you can leave it in the IRA. Rolling into an IRA first does not trigger any taxes or penalties — it is treated the same as a direct rollover.

Get the 403(b) plan's name and the contact information for its administrator before you leave your job. This makes the rollover process faster and reduces the chance of a mistake.

What happens to employer matching and vesting

When you roll a 401(k) into a 403(b), you move only the money that belongs to you. This includes your own contributions and any employer matching that has vested. If you have not been at the job long enough for all of the employer match to vest, you leave the unvested portion behind — you do not get that money.

Vesting schedules vary by employer. Some companies vest matching contributions when ready; others use a schedule that takes three to six years. Check your 401(k) statement or ask HR how much of your employer match is vested before you leave. Only the vested portion rolls over.

The 403(b) plan at your new employer may have its own matching program with its own vesting schedule. That is separate from the 401(k) rollover. You start fresh with the new employer's match.

Tax treatment of the rollover

A direct rollover from a 401(k) to a 403(b) is not a taxable event. You do not owe income tax on the amount you roll over, and it does not count toward your annual income for that year. The money stays in a tax-deferred retirement account the whole time.

If you do an indirect rollover and do not deposit the full amount within 60 days, the shortfall counts as a distribution. You owe income tax on it at your ordinary tax rate, plus a 10 percent early withdrawal penalty if you are under 59½. This is why a direct rollover is strongly recommended.

The 403(b) will track the rollover separately from contributions you make going forward. When you withdraw money in retirement, the IRS will know which portion came from the rollover and which came from new contributions, though both are taxed the same way.

Rolling over a Roth 401(k) to a Roth 403(b)

If your 401(k) is a Roth account, you can roll it into a Roth 403(b) using the same process. The money stays in a Roth account, and no taxes are owed on the rollover. However, not all 403(b) plans offer a Roth option. Ask the new employer whether their 403(b) includes a Roth component before you leave your job.

If the 403(b) does not have a Roth option, you cannot roll a Roth 401(k) directly into it. You could roll it into a Roth IRA instead, though Roth IRA contributions are subject to income limits. A Roth IRA conversion may also trigger taxes depending on your other retirement account balances. This is a situation where it helps to speak with a tax professional or financial advisor.

What to do if the rollover is delayed or rejected

If your 401(k) plan administrator or the 403(b) plan rejects the rollover, ask for the reason in writing. Common issues include a mismatch in account numbers, a missing signature, or a plan rule that prohibits the rollover. Most of these can be fixed by resubmitting the paperwork.

If the 403(b) truly will not accept the rollover, roll the 401(k) into a traditional IRA. This is a backup that always works. You can then roll the IRA into a 403(b) later if circumstances change, or you can keep the money in the IRA indefinitely.

Keep copies of all rollover paperwork — the rollover request form, the check stub, and the deposit confirmation from the 403(b). If a question comes up later, you will have proof that the rollover was completed correctly.

Frequently Asked Questions

Can I roll a 401(k) into a 403(b) while I am still working?

Only if your 401(k) plan allows in-service rollovers, which most do not. Contact your HR or plan administrator to find out. If your plan does allow it, you may only be able to roll over certain portions of your balance. Once you leave the job, you can roll over the full balance without restriction.

What if I have multiple 401(k)s from different jobs?

You can roll each one into the 403(b) separately, or you can combine them into a single IRA first and then roll the IRA into the 403(b). Combining them into an IRA first can simplify the process if you have several old 401(k)s. Ask the 403(b) plan whether it has a limit on the number of rollovers it will accept in a year.

Do I have to roll over the entire 401(k) balance?

No. You can roll over part of the balance and leave the rest in the 401(k) or take it as a distribution. However, if you take a distribution, you owe income tax and possibly a 10 percent penalty if you are under 59½. A partial rollover is less common but is allowed.

How long does a 401(k) to 403(b) rollover take?

A direct rollover typically takes one to two weeks once the 401(k) plan processes your request. The 403(b) plan must then receive and deposit the funds. In total, expect two to four weeks from start to finish. Indirect rollovers may take longer because you are handling the deposit yourself.

Can I roll a 401(k) into a 403(b) if I am over 59½?

Yes. Age does not prevent a rollover. You can roll a 401(k) into a 403(b) at any age after you leave the job. If you are over 59½, you can also withdraw money from either account without a 10 percent penalty, though you still owe income tax on withdrawals.