Common 401(k) Rollover Mistakes and How to Avoid Them: Troubleshooting Rollover Issues

Rolling over a 401(k) sounds straightforward until it isn’t. Thousands of Americans hit unexpected walls every year — frozen accounts, withheld checks, missed deadlines — that can cost them thousands in taxes and penalties. Here’s exactly what goes wrong and how to fix it before your retirement savings take the hit. (Related: How to Rollover a 401k to an IRA in 2026: The Complete Step-by-Step Guide) (Related: Moving to Texas for Retirement: The Complete 2026 Guide to Taxes, Costs, and Rolling Over Your 401k) (Related: IRA Rollover: The Complete 2026 Guide to Moving Your Retirement Savings Safely) (Related: IRA Rollover Rules: How to Avoid the One-Per-Year Rule Violation and Unexpected Tax Penalties) (Related: What Happens If You Miss the 60-Day Rollover Deadline in 2026: Complete Guide) (Related: 403(b) to IRA Rollover: The Complete 2026 Process and Costs Guide)

Why 401(k) Rollovers Fail More Often Than You’d Expect

According to the IRS, Americans hold over $7.3 trillion in 401(k) plans as of recent estimates, and the Government Accountability Office has reported that workers leave behind billions in orphaned retirement accounts each year when changing jobs. The rollover process — moving that money to a new employer plan or IRA — is where a surprising number of people get stuck.

The MarketWatch case of an $800,000 401(k) that couldn’t be rolled over isn’t unusual in its frustration, only in its dollar amount. The root causes tend to be the same whether you’re moving $80,000 or $800,000: paperwork errors, employer plan restrictions, timing missteps, and a fundamental misunderstanding of how the two rollover methods actually work.

Use our 401(k) rollover calculator to estimate what your balance could look like in a new account — and what a botched rollover could cost you in taxes.

Mistake #1: Choosing an Indirect Rollover Without Understanding the Rules

This is the single most expensive mistake in the rollover process, and it catches people off guard constantly.

How Indirect Rollovers Work (and Where They Break)

An indirect rollover means your old plan sends you a check directly. You then have 60 days to deposit the full amount into your new IRA or 401(k). But here’s the catch the IRS doesn’t advertise loudly: your employer is required by law to withhold 20% for federal income taxes before cutting that check.

So if you have $100,000 in your old 401(k), you’ll receive a check for $80,000. To complete a valid rollover and avoid taxes and the 10% early withdrawal penalty (if you’re under 59½), you must deposit the full $100,000 — meaning you’ll need to come up with the missing $20,000 out of pocket. You’ll eventually get that withholding back as a tax refund, but you have to front the cash first.

According to IRS Publication 590-A, if you fail to deposit the full pre-withholding amount within 60 days, the withheld portion is treated as a taxable distribution. On an $800,000 account, that could mean a six-figure tax bill plus penalties.

The Better Option: Direct Rollovers

A direct rollover (also called a trustee-to-trustee transfer) eliminates this problem entirely. The money moves directly from your old plan to your new one — you never touch it, so there’s no mandatory withholding and no 60-day clock. The IRS explicitly recommends direct rollovers to avoid the tax withholding trap.

Mistake #2: Not Confirming Your New Plan Accepts Rollovers

Not every 401(k) plan accepts incoming rollovers. This surprises people regularly. Before initiating anything, you need to confirm three things with your new plan administrator:

Does the plan accept rollover contributions at all?
Does it accept rollovers from a previous employer’s 401(k) specifically?
Are there waiting periods before new employees can roll money in?

Some plans require you to be enrolled for 30, 60, or even 90 days before accepting a rollover. If you initiate a rollover to an IRA instead and your new employer later offers a better institutional rate or plan features, that decision becomes harder to unwind.

If your new employer plan won’t accept the rollover immediately, a traditional IRA rollover is almost always available as an alternative. Run the numbers on both scenarios using our 401(k) rollover calculator to compare long-term outcomes.

Mistake #3: Outstanding Loans That Block the Rollover Entirely

This is one of the most common hidden blockers — and the one most likely behind the MarketWatch scenario. If you have an outstanding 401(k) loan from your old employer plan, that loan typically becomes due in full when you leave the company. The timeline is not generous.

Under rules updated by the Tax Cuts and Jobs Act of 2017, if you leave your job with an outstanding plan loan, you now have until your federal tax filing deadline (including extensions) for the year you left employment to roll the offset amount into an IRA or another eligible plan. Before 2018, you only had 60 days.

But many plan administrators will freeze the account or block a rollover until the loan situation is resolved. If you can’t pay it back, the unpaid loan balance becomes a taxable distribution — and potentially subject to the 10% early withdrawal penalty if you’re under 59½.

What to Do If You Have an Outstanding Loan

Contact your plan administrator immediately to confirm the loan payoff amount
Determine if you can repay the loan before leaving (or shortly after)
If not, calculate the tax impact of the loan being treated as a distribution
Consult a tax professional about the extended rollover deadline for loan offsets

Mistake #4: Missing the 60-Day Deadline (and Not Knowing About Waivers)

Life happens. Documents get lost. Banks have processing delays. If you took an indirect rollover and missed the 60-day window, your options narrow quickly — but they don’t disappear entirely.

The IRS can grant a 60-day waiver under specific hardship circumstances, including:

Errors committed by the financial institution
Casualty, disaster, or other events beyond your reasonable control
Death, disability, hospitalization, or incarceration
Restrictions imposed by a foreign country
Postal errors

Per IRS guidance on hardship waivers, you can request automatic relief using a self-certification procedure if the delay was due to one of these qualifying reasons — without having to apply to the IRS directly. This was updated under Revenue Procedure 2020-46.

If the delay was due to a financial institution error specifically, they can certify the rollover contribution directly, which generally allows the late rollover to be accepted.

Mistake #5: Rolling Over Shares That Contain Net Unrealized Appreciation

This is a more advanced mistake, but it costs people real money on large accounts. If your 401(k) holds employer stock that has appreciated significantly, rolling it into an IRA might not be your best move.

Net Unrealized Appreciation (NUA) is a tax strategy where you take a lump-sum distribution of employer stock, pay ordinary income tax only on your original cost basis, and then pay the lower long-term capital gains rate on the appreciation when you eventually sell — rather than ordinary income rates on the full amount when you withdraw from an IRA.

On a large account with highly appreciated stock, this distinction can represent tens of thousands of dollars in tax savings. If you roll those shares into an IRA without evaluating NUA treatment first, you permanently lose the option.

Frequently Asked Questions About 401(k) Rollover Problems

What happens if my old employer’s 401(k) plan closes before I can roll it over?

If your former employer terminates their 401(k) plan, they are required to distribute all account balances. You’ll typically receive a notice giving you a rollover window — often 30 to 60 days. If you don’t act, the balance may be rolled into a Safe Harbor IRA (sometimes called a “stranded” IRA) chosen by the plan administrator, which may carry high fees or limited investment options. Act quickly when you receive termination notices.

Can I roll over a 401(k) from a previous employer I left years ago?

Yes. There’s no hard deadline to roll over an old 401(k) — your money can sit in a former employer’s plan indefinitely (unless the plan terminates or your balance is under $7,000, in which case the plan may force a distribution). However, leaving money in a forgotten old account creates real risks: lost contact, missed fee disclosures, and limited investment management. Use our rollover calculator to estimate the long-term impact of consolidating those funds today.

How do I know if my rollover was processed correctly?

Confirm three things: (1) your old account shows a zero balance or the expected remaining amount, (2) your new account shows the incoming deposit with the correct classification as a “rollover contribution” — not a regular contribution, (3) you receive a Form 1099-R from your old plan showing the distribution, and a Form 5498 from your new plan showing the rollover deposit. If the 1099-R shows a taxable amount but you completed a direct rollover, contact the plan administrator — it should show $0 in taxable amount on a properly executed direct transfer.

Why would a plan administrator freeze my account and refuse to process a rollover?

Common reasons include: an outstanding loan balance, an active domestic relations order (QDRO) from a divorce proceeding, an ongoing IRS levy on the account, missing updated beneficiary information, or an internal administrative review. Contact your plan’s HR department and plan administrator in writing and ask for the specific written reason for the hold. Document every communication.

The Rollover Checklist: Before You Initiate Anything

Before submitting a single form, work through this sequence:

Confirm your vested balance — unvested employer contributions cannot be rolled over
Check for outstanding loans and resolve or plan for them
Evaluate employer stock for NUA treatment if applicable
Choose direct rollover over indirect whenever possible
Verify the receiving account is open and accepts rollovers before initiating
Request rollover paperwork in writing and keep copies of everything
Follow up within 2 weeks to confirm the transfer is in motion

The $800,000 rollover problem in that MarketWatch story is a stark reminder that account size doesn’t protect you from procedural mistakes. A $10,000 error and an $800,000 error follow the same IRS rules. The preparation is identical — only the stakes are different.

This article is for informational purposes only and does not constitute financial, legal, or professional advice. Consult a qualified professional before making decisions.

Common 401(k) rollover mistakes and how to avoid them: troubleshooting rollover issues