9 IRA Rollover Mistakes That Cost Real Money

Most IRA rollovers go smoothly. A few go badly wrong — and when they do, the damage is often permanent. Some mistakes trigger income tax on a six-figure balance you never intended to cash out. Others forfeit a benefit you can never get back. This guide covers the nine mistakes that show up most often, what each one actually costs, and how to avoid every one of them.

Mistake 1: Taking an indirect rollover instead of a direct transfer

When you leave a job, the default option many plans offer is a check made payable to you — called an indirect or 60-day rollover. Federal law requires the plan to withhold 20% of your distribution for federal income taxes before sending the check.¹ This is mandatory; you cannot opt out.

The trap: To complete a tax-free rollover, you must deposit the full original distribution amount — including the 20% the plan already sent to the IRS — into an IRA within 60 days. That means you have to come up with the withheld 20% out of pocket to avoid tax on that portion.

Example: You leave your job with $500,000 in your 401(k). The plan cuts you a check for $400,000 (withholding $100,000 for taxes). To complete a tax-free rollover, you must deposit $500,000 into an IRA within 60 days. That means you need to find $100,000 elsewhere temporarily. Most people don't have $100,000 sitting around. The $100,000 shortfall becomes ordinary income — taxed at your marginal rate (potentially 32–37%) — plus a 10% early withdrawal penalty if you're under 59½.

The fix is simple: request a direct (trustee-to-trustee) transfer. Your new IRA custodian sends paperwork to your old plan, and the money moves directly. No check to you, no withholding, no 60-day clock. See our direct vs. indirect rollover guide for the exact steps.

Mistake 2: Triggering the once-per-year IRA rollover rule

Most people don't know this rule exists until they accidentally violate it. You may perform only one indirect (60-day) IRA-to-IRA rollover per 12-month period, counting across all your IRAs as a single aggregate — not per account.²

Why this is different from 401k-to-IRA rollovers: This limit applies only to IRA-to-IRA 60-day rollovers, not to direct rollovers from employer plans (401(k), 403(b), TSP, etc.) to an IRA. You can roll multiple employer plans to an IRA in the same year without triggering this rule — as long as they go via direct transfer.

The cost when you trigger it: A second IRA-to-IRA 60-day rollover within 12 months is treated as a distribution — fully taxable, plus the 10% early withdrawal penalty if you're under 59½. The amount deposited back into the receiving IRA is also treated as an excess contribution, which incurs a 6% excise tax per year until corrected.²

When this commonly happens: Someone takes money from IRA #1, uses it temporarily, and replaces it within 60 days. Then 6 months later they do the same from IRA #2 (not realizing the 12-month window is still open). Second withdrawal: fully taxable. The fix is always to use direct trustee-to-trustee transfers between IRAs rather than personal indirect rollovers.

Mistake 3: Rolling over in an RMD year without taking the RMD first

Once you reach age 73 (or 75 if you were born in 1960 or later, per SECURE 2.0 § 107), you're subject to Required Minimum Distributions from your traditional IRA. The first RMD for the year cannot be rolled over — it is an ineligible amount.³ If you attempt to roll over funds that include your RMD for that year, the RMD portion lands in the IRA as an excess contribution.

What excess contribution means: The RMD amount is treated as an excess IRA contribution, subject to a 6% excise tax per year until you withdraw it. You also still owe income tax on the RMD — you didn't escape the distribution, you just also broke the IRA rules.

Example: Your traditional IRA had $800,000 at year-end and your RMD is $30,000. You direct your custodian to do a full rollover to a new IRA. If you haven't taken the $30,000 RMD first, the plan is required to withhold it — but some people catch this too late or the sequencing gets confused with multiple accounts.

The fix: if you're in or near RMD age and rolling over, take your RMD first, then initiate the rollover on the remaining balance. Your IRA custodian must withhold the RMD before processing any rollover, but it's cleaner if you manage the sequence yourself.

Mistake 4: Rolling to an IRA when the Rule of 55 applies

Under IRC § 72(t)(2)(A)(v), if you separate from service during or after the calendar year in which you turn 55, you can take distributions from that employer's 401(k) without the 10% early withdrawal penalty. This applies immediately on separation — you don't have to wait until a specific birthday, only until you turn 55 in the year you leave.

Once you roll that 401(k) to an IRA, the Rule of 55 is gone permanently. IRA distributions before 59½ are subject to the 10% penalty (with different exceptions, none as clean as Rule of 55 for early retirees).

Example: David leaves his company at 57 with $1.1 million in his 401(k). He needs $80,000/year for the next 2.5 years until his pension kicks in at 59½. Under the Rule of 55, those distributions are penalty-free — he owes only ordinary income tax. If he rolls to an IRA first, those same distributions cost him an extra $8,000/year in penalties — $20,000 total, after-tax.

See our leave-401(k)-vs.-rollover guide for the complete Rule of 55 analysis and when staying in the plan is the right call.

Mistake 5: Not evaluating NUA before rolling employer stock

If your 401(k) contains highly appreciated company stock, rolling it to an IRA permanently converts a low-tax opportunity into a high-tax one. Under the Net Unrealized Appreciation (NUA) strategy (IRC § 402(e)(4)), you can take employer stock as an in-kind distribution, pay ordinary income tax only on the cost basis, and then sell the shares at long-term capital gains rates on all the appreciation — even if held for just one day.

Once the stock is inside an IRA, all future distributions from that IRA are taxed as ordinary income, not capital gains. You've permanently forfeited the NUA discount.

Example: Your 401(k) holds $400,000 of employer stock with a $30,000 cost basis. The NUA spread is $370,000. Rolling to an IRA means that $370,000 will eventually be taxed at ordinary rates (up to 37%). Taking in-kind distribution and selling means $370,000 is taxed at long-term capital gains rates (0/15/20% depending on income) — a potential saving of $62,900–$99,900 in federal tax alone on that one decision.

The NUA window is only open before the rollover. Run the numbers with our NUA calculator before moving any employer stock.

Mistake 6: Contaminating a clean IRA with pre-tax rollover funds (breaking backdoor Roth)

If you make backdoor Roth IRA contributions — a non-deductible traditional IRA contribution immediately converted to Roth — pre-tax IRA balances are a problem. The IRS's pro-rata rule (IRC § 408(d)(2)) treats all your traditional IRA balances as a single pool when calculating the taxable portion of any conversion. Rolling over a pre-tax 401(k) into a traditional IRA activates this rule.

Example: You've been doing clean backdoor Roth conversions for years — you had zero pre-tax IRA balance, so each $7,500 non-deductible contribution converted 100% tax-free. Now you roll over a $450,000 pre-tax 401(k) into an IRA. Suddenly your IRA pool is $457,500, of which only $7,500 (1.6%) is after-tax basis. Converting $7,500 now costs you $7,380 in taxable income — the backdoor effectively breaks.

If you do backdoor Roth contributions, evaluate whether rolling to an IRA makes sense at all vs. rolling the balance into your current employer's 401(k) plan (which keeps the IRA clean). See our pro-rata rule guide for the three strategies to fix or prevent the contamination.

Mistake 7: Missing the after-tax split rollover

Many 401(k) plans allow after-tax (non-Roth) contributions beyond the normal deferral limits. Under IRS Notice 2014-54, when you do a rollover, you can split the distribution: send the pre-tax portion to a traditional IRA (or another 401(k)), and send the after-tax basis directly to a Roth IRA — with zero federal income tax on the Roth piece.

If you roll everything — pre-tax and after-tax — into a single traditional IRA, the after-tax basis is preserved but the money is now locked in a traditional IRA that you'll eventually have to pay taxes on when you take RMDs or do Roth conversions. You've squandered a free Roth IRA conversion.

Example: Your 401(k) has $400,000 pre-tax and $50,000 after-tax basis. Split rollover: $400,000 goes to traditional IRA (taxable someday), $50,000 goes to Roth IRA — tax-free, growing tax-free forever. If you roll everything to traditional IRA, that $50,000 after-tax basis is now trapped in a taxable vehicle where it'll generate unnecessary taxes later.

Before rolling over, ask your plan administrator whether your account contains any after-tax contributions. If so, see our after-tax 401(k) split rollover guide for the exact steps.

Mistake 8: Not updating beneficiary designations after the rollover

This is the most overlooked post-rollover task. Your 401(k) beneficiary designation does not automatically carry over to your new IRA. The IRA starts with no beneficiary on record — or whatever default the custodian applies, which is often your estate.

If you die with the estate as your IRA beneficiary, the full balance must be distributed within 5 years under the 5-year rule, creating a massive income tax event for your heirs. A named individual beneficiary gets the 10-year rule (with annual RMDs if you died past your required beginning date), or even better, stretched-out distributions if they qualify as an Eligible Designated Beneficiary.

Additionally: your 401(k) required spousal consent under ERISA § 205 to name anyone other than your spouse as primary beneficiary. Your IRA does not have this rule (IRC § 408 is not subject to ERISA). If your family situation or estate planning intentions differ from the 401(k) default, you now have full flexibility — but you have to actually make the designation.

Do this the day the rollover completes. It takes 5 minutes. See our beneficiary designations guide for the full framework including per-stirpes vs. per-capita, trusts, and minor children.

Mistake 9: Trying to roll over a non-governmental 457(b) to an IRA

If you worked for a non-governmental employer (private hospital, nonprofit, private university) and participated in a 457(b) plan, those funds are subject to a strict limitation: under IRC § 402(c), non-governmental 457(b) balances cannot be rolled over to a traditional IRA or any other plan. Period.

Non-governmental 457(b) assets are technically the employer's assets (held in a rabbi trust) until distributed. When you separate, your only option is to take distributions — which are fully taxable as ordinary income in the year distributed. There is no rollover. If you attempt to "roll" this money to an IRA, you've created an excess contribution to the IRA (the distribution is income, not eligible rollover funds).

Governmental 457(b) plans (federal, state, and local government employees) are completely different — those can roll to an IRA. Know what type you have before taking any action. See our 403(b) and 457 rollover guide for the full mechanics.

Interactive checklist — which traps apply to you?

Check each item that may be relevant to your situation. The tool flags potential issues to investigate before you initiate a rollover.

When these mistakes are hardest to catch on your own

Mistakes 4 and 5 (Rule of 55 and NUA) are easy to miss because they require knowing a specific rule applies to your situation before you act. Most financial institutions processing rollovers don't flag these — it's not their job to advise you. Mistakes 6 and 7 (pro-rata contamination and after-tax split) require understanding your own account composition in detail. Mistake 3 (RMD year sequence) catches people who just turned 73 and are rolling over for the first time.

A fee-only advisor who specializes in IRA rollovers has run this exact checklist hundreds of times and knows which questions to ask based on your specific plan type, age, account composition, and tax situation. The cost of a few hours of specialist advice is trivial next to the permanent tax savings from getting these decisions right.