Can You Roll a 401(k) Into a 403(b)? Loans, Fees, and Rule of 55

Yes, rolling a 401(k) into a 403(b) is allowed under federal law. The Internal Revenue Code lists a 403(b) annuity contract as an “eligible retirement plan” that can receive a rollover distribution from a 401(k), and a properly executed transfer keeps your savings tax-deferred with no income tax and no early-withdrawal penalty.¹ Whether it’s the right move depends on the fees inside the new plan, whether you have an outstanding 401(k) loan, how your Roth dollars will be handled, and whether you might want to tap the money before age 59½.

When You’re Eligible to Roll the Money Over

You can’t move a 401(k) balance on demand. The plan has to release it first, and the IRS limits when that can happen. For the money you contributed from your paycheck, a distribution is typically triggered by separation from service, plan termination without a replacement defined-contribution plan, reaching age 59½ (if the plan allows in-service distributions), or disability or death.²

The usual path into a 403(b) is leaving a private-sector job for a public school, church, or 501(c)(3) tax-exempt employer, since those are the three employer types that can sponsor a 403(b).³ Separating from the old employer is what makes you eligible to take the distribution in the first place.

One requirement catches people off guard: the receiving 403(b) plan has to accept incoming rollovers. Plans are not required to.⁴ Ask the new plan’s administrator before you start any paperwork. If the answer is no, your options are leaving the money in the old 401(k) or moving it to an IRA.

Pre-Tax, Roth, and After-Tax Balances Have to Match

The tax character of each dollar has to survive the transfer, or you’ll create a tax bill you didn’t intend.

Pre-tax contributions roll into the traditional side of the 403(b). No tax at transfer; taxes come later when you withdraw in retirement.⁴
Roth 401(k) money has to go into a designated Roth account inside the 403(b). If the 403(b) doesn’t offer a Roth option, a Roth IRA is the alternative destination for that slice.¹
Non-Roth after-tax contributions can be split off at the same time and sent to a Roth IRA while the pre-tax portion goes to the 403(b), as long as both transfers happen together.⁵

Before the transfer, ask the 401(k) provider for a statement that breaks the balance into pre-tax, Roth, and after-tax components with the earnings allocated to each. Most 403(b) administrators will want that breakdown before they code the incoming money.

What Happens to an Outstanding 401(k) Loan

If you owe money to your 401(k), the loan usually has to be settled before the plan releases the rest of your balance. When you can’t repay it, the plan reduces your account by the unpaid amount and distributes what’s left. That reduction is called a plan loan offset.⁶

The offset counts as a distribution. Left alone, it becomes taxable income, plus a 10% penalty if you’re under 59½. You can avoid that by rolling an equal amount of your own cash into the 403(b) or an IRA within a deadline that depends on why the offset happened:

If it was triggered by separation from service or plan termination, it’s a qualified plan loan offset, and you have until your tax filing due date for that year, including extensions.⁶
For any other offset, you have 60 days from the date of the offset.⁷

Because the offset amount is never paid out to you, funding the rollover requires cash from another source. If your loan balance was $8,000, you’d need to deposit $8,000 from personal savings into the 403(b) or IRA before the deadline to keep the offset from being taxed.

Direct Transfer vs. Getting a Check

A direct rollover, sometimes called a trustee-to-trustee transfer, sends the money straight from the 401(k) provider to the 403(b) provider. Federal law requires 401(k) plans to offer this option for any eligible rollover distribution.⁸ The funds may move by wire or ACH, or the old provider may mail a check made payable to the new provider. Because the money never lands in your personal account, nothing is withheld and there’s no 60-day clock.

If instead the check is made payable to you personally, two things happen. First, the 401(k) provider must withhold 20% for federal taxes. On a $50,000 distribution, you’d receive $40,000. To complete a full rollover, you’d need to come up with the missing $10,000 from your own pocket and deposit the whole $50,000 into the 403(b), then wait to recover the withheld amount as a tax refund. Second, you have 60 days from receipt to make that deposit. Miss the deadline and the full amount becomes taxable income, with a 10% penalty on top if you’re under 59½.⁴

When you fill out the distribution request, ask that any physical check be made payable to the receiving institution “for the benefit of” you, phrased like “XYZ Retirement Services FBO Jane Smith.” That formatting keeps the transfer classified as direct and avoids the mandatory withholding.

Compare Fees Before You Move the Money

A 401(k) and a 403(b) can look similar on the surface while running on different cost structures underneath. Many 403(b) plans, particularly at public schools and hospitals, rely on insurance-company annuity contracts as the main investment vehicle. Those products may impose surrender charges if you move or withdraw money within a set holding period (often five to ten years), and their ongoing expense ratios tend to sit higher than the mutual funds or collective investment trusts typically found in 401(k) plans.³ The IRS itself flags high administrative costs as a potential drawback of 403(b) plans. Industry data suggests the average 403(b) investment cost runs roughly 0.41% versus 0.33% for 401(k) plans, a gap that compounds into tens of thousands of dollars over a full career.

Not every 403(b) is expensive. Some, especially at large universities, offer low-cost index funds comparable to a well-run 401(k). Request the fee disclosure document from the 403(b) administrator before you commit. If the menu is significantly costlier than what you already have, rolling into an IRA can be the better call.

How the Rollover Affects the Rule of 55

If you’re between 55 and 59½, the choice of destination matters. Under the Rule of 55, distributions from an employer-sponsored plan are exempt from the 10% early-withdrawal penalty if you separate from service during or after the year you turn 55.⁹ Public safety employees in governmental plans qualify at 50.

The exception applies to both 401(k) and 403(b) plans, but only to the plan you separated from. Rolling your old 401(k) into a new employer’s 403(b) while you’re still working there means the Rule of 55 won’t cover those dollars until you eventually leave that job too. Rolling into an IRA strips the protection entirely, because the exception doesn’t apply to IRA distributions.⁹ Keeping the money inside an employer plan preserves the option.

Tax Reporting After the Rollover

Two documents close out the paperwork. By January 31 of the year after the distribution, the 401(k) provider issues IRS Form 1099-R showing the amount paid out. For a direct rollover, it will carry distribution code G, which tells the IRS the transfer wasn’t a taxable event.¹⁰

The 403(b) provider doesn’t send a Form 5498. That form is used only by IRA trustees to report IRA contributions.¹¹ Instead, the 403(b) will show the incoming deposit on a confirmation or quarterly statement. Cross-check the amount on the 1099-R against what actually landed in the 403(b). If the figures don’t match, ask the 401(k) administrator for a detailed ledger of the distribution, and note whether any processing fee was deducted from the balance.

Hold onto the 1099-R, the final 401(k) statement, and the 403(b) confirmation for at least three years after you file the return for the year of the rollover. If the IRS ever asks, those records prove the money moved directly into another qualified plan and shouldn’t be taxed.

1
Office of the Law Revision Counsel. 26 USC 402: Taxability of Beneficiary of Employees’ Trust
2
Internal Revenue Service. 401(k) Resource Guide – Plan Participants – General Distribution Rules
3
Internal Revenue Service. IRC 403(b) Tax-Sheltered Annuity Plans
4
Internal Revenue Service. Rollovers of Retirement Plan and IRA Distributions
5
Internal Revenue Service. Rollovers of After-Tax Contributions in Retirement Plans
6
Internal Revenue Service. Plan Loan Offsets
7
eCFR. 26 CFR 1.402(c)-2 – Eligible Rollover Distributions
8
Office of the Law Revision Counsel. 26 USC 401: Qualified Pension, Profit-Sharing, and Stock Bonus Plans
9
Internal Revenue Service. Retirement Topics – Exceptions to Tax on Early Distributions
10
Internal Revenue Service. Form 1099-R, Distributions From Pensions, Annuities, Retirement or Profit-Sharing Plans, IRAs, Insurance Contracts, Etc.
11
Internal Revenue Service. About Form 5498, IRA Contribution Information