Yes, you can roll a 401(k) into a 403(b), but the rules depend on your employer and the receiving plan

A direct rollover from a 401(k) to a 403(b) is allowed under federal tax law, but not every 403(b) plan accepts them. Your current 403(b) plan document must explicitly permit 401(k) rollovers — some do, some don't. If your plan does accept them, the money moves directly from your old 401(k) plan administrator to your new 403(b) plan, with no tax withheld and no taxable event. If your plan does not accept rollovers, you have other options, but they carry different tax consequences.

The key difference between a direct rollover and other moves is that a direct rollover avoids the 60-day rule and automatic withholding. Money never touches your hands. If you withdraw the money yourself and then deposit it into the 403(b) within 60 days, the IRS treats it as a rollover, but your employer must withhold 20 percent for federal income tax, and you have to make up that amount from other funds to roll over the full balance.

Key Takeaways

  • A direct rollover from a 401(k) to a 403(b) avoids taxes and withholding, but only if your 403(b) plan document permits 401(k) rollovers.
  • You must contact your 403(b) plan administrator first to confirm they accept 401(k) rollovers and to get their rollover instructions.
  • If your 403(b) plan does not accept rollovers, you can roll the 401(k) into a traditional IRA instead, which has no plan restrictions.
  • A 60-day indirect rollover is possible but triggers mandatory 20 percent withholding and requires you to deposit the full amount within 60 days or face taxes and penalties.
  • Once money is in a 403(b), it remains subject to that plan's withdrawal rules and investment options, not your old 401(k) plan's rules.

How to confirm your 403(b) plan accepts 401(k) rollovers

Contact your 403(b) plan administrator — the company or organization that manages your plan — and ask whether the plan document permits rollovers from 401(k) plans. This is not a question for your employer's benefits department; it is a question for the plan administrator directly. The administrator's contact information appears on your 403(b) statements or in your plan's summary plan description, a document your employer must provide.

When you call or email, ask for their rollover procedures in writing. They will tell you whether they accept 401(k) rollovers, what forms you need to complete, and whether they have any restrictions — for example, some plans require the rollover to be deposited into a specific investment option, or they may not accept rollovers from certain types of 401(k) plans (such as straightforward 401(k)s). Write down the name of the person you speak with and the date, in case you need to follow up.

The direct rollover process

Once your 403(b) plan confirms it accepts rollovers, you initiate the transfer through your old 401(k) plan administrator. You do not withdraw the money yourself. Instead, you request a direct rollover, which means the 401(k) administrator sends the funds directly to the 403(b) plan. You will need to provide your 403(b) plan's name, account number, and the administrator's mailing address or wire instructions.

The 401(k) administrator will send the money to the 403(b) plan, and the 403(b) plan will deposit it into your account. This process typically takes one to three weeks, depending on how quickly each plan processes the transfer. You will receive confirmation from both the 401(k) plan (showing the distribution) and the 403(b) plan (showing the deposit). Keep these documents for your tax records.

No federal income tax is withheld during a direct rollover, and the transfer is not reported as income on your tax return. The money retains its tax-deferred status in the 403(b) plan.

What happens if your 403(b) plan does not accept rollovers

If your 403(b) plan does not permit 401(k) rollovers, you have two main alternatives: roll the 401(k) into a traditional IRA, or leave the money in the 401(k) and keep both accounts separate.

A traditional IRA rollover works the same way as a 403(b) rollover — you request a direct rollover from the 401(k) administrator to an IRA at a bank, brokerage, or other financial institution. IRAs have no restrictions on accepting 401(k) rollovers. The money stays tax-deferred, and no withholding occurs. An IRA gives you more investment choices than most 403(b) plans, but it also has different withdrawal rules. For example, IRAs have a required minimum distribution (RMD) starting at age 73, just like 403(b)s, but the calculation may differ.

Leaving the money in the 401(k) is also an option if you are no longer employed by that employer. You can keep the 401(k) open indefinitely, and it will continue to grow tax-deferred. However, you will have two separate accounts to monitor and manage, and you may face higher fees if the 401(k) plan charges administrative fees for small balances.

The 60-day indirect rollover and why to avoid it

If you withdraw money from your 401(k) and deposit it into your 403(b) within 60 days, the IRS treats it as a rollover. However, this method has significant drawbacks. Your 401(k) plan administrator is required by law to withhold 20 percent of the distribution for federal income tax. If your 401(k) balance is $50,000, you receive $40,000, and $10,000 is withheld.

To avoid taxes on the full amount, you must deposit the entire $50,000 into the 403(b) within 60 days. That means you have to come up with $10,000 from your own funds to make up the withheld amount. If you deposit only the $40,000 you received, the $10,000 withheld is treated as a taxable distribution, and you owe income tax on it. You may also owe a 10 percent early withdrawal penalty if you are under age 59½.

The 60-day rule is strict: if you miss the important date by even one day, the entire amount becomes taxable. A direct rollover avoids all of these complications and is always the better choice when available.

Tax treatment and reporting after the rollover

Once money is rolled into your 403(b), it is treated as part of your 403(b) balance for all tax purposes. The original 401(k) contribution basis and any earnings are now part of your 403(b) account. You do not report the rollover as income on your tax return in the year it occurs.

Your 403(b) plan will report the rollover on Form 5498, which the plan sends to you and the IRS. This form shows the amount rolled in and confirms that it was a rollover (not a taxable distribution). Keep this form with your tax records.

Going forward, your 403(b) plan's withdrawal rules explore. If you withdraw money before age 59½, you may owe a 10 percent early withdrawal penalty, unless an exception applies (such as separation from service, disability, or a series of substantially equal periodic payments). Your 403(b) plan may also have its own restrictions on withdrawals or loans that differ from your old 401(k) plan.

Rollovers from straightforward 401(k)s and other special cases

If your 401(k) is a straightforward 401(k) (a small-business plan), special rules explore. You cannot roll a straightforward 401(k) into a 403(b) or a traditional IRA until you have been in the straightforward plan for at least two years. If you try to roll it over before two years have passed, the distribution is treated as taxable income, and you owe a 25 percent early withdrawal penalty (not the usual 10 percent).

If your 401(k) contains after-tax contributions (money you contributed on which you already paid income tax), the rollover rules are more complex. After-tax contributions can be rolled into a 403(b) if the plan accepts them, but they must be tracked separately from pre-tax contributions. Some 403(b) plans do not accept after-tax contributions, so confirm this with your plan administrator before rolling over.

Frequently Asked Questions

Do I have to roll my 401(k) into a 403(b), or can I leave it where it is?

You can leave your 401(k) where it is indefinitely. There is no requirement to roll it over. However, if you have left the employer that sponsored the 401(k), you may face higher fees or limited investment choices. Rolling over consolidates your retirement savings into one account, which can simplify management.

What if I have already taken a distribution from my 401(k) and want to roll it over?

You have 60 days from the date you received the distribution to deposit it into a 403(b) or IRA. If you received $40,000 after 20 percent withholding, you must deposit the full $40,000 within 60 days to avoid taxes on that amount. The $10,000 withheld is treated as a taxable distribution unless you contribute it from other funds.

Can I roll a 403(b) into a 401(k)?

Yes, but only if your new employer's 401(k) plan accepts rollovers from 403(b) plans. Not all 401(k) plans do. The process is the same: request a direct rollover from your 403(b) plan administrator to your new 401(k) plan. Contact your new employer's benefits department to confirm the 401(k) plan accepts 403(b) rollovers and to get the plan's rollover instructions.

Will rolling over my 401(k) into a 403(b) change my investment options?

Yes. Your 403(b) plan offers its own set of investment options, which may be different from your 401(k) plan. Once the money is in the 403(b), you can only invest in the options the 403(b) plan offers. Review the 403(b) plan's investment menu before you roll over to make sure the options meet your needs.

Do I owe taxes when I roll over a 401(k) to a 403(b)?

No, not if you do a direct rollover. The money is not reported as income, and no federal tax is withheld. The money retains its tax-deferred status. You will owe taxes only when you withdraw the money from the 403(b) in retirement.