IRA vs 401(k) Rollover Rules: A CPA's Guide for Client Advising

6/29/2026

Rollover errors are among the most expensive mistakes a client can make with a practitioner's help, and they share a feature: most are unfixable once made.

Not "expensive to fix." Unfixable. A violated one-per-year rule, a missed sixty-day deadline, or employer stock rolled into an IRA cannot be undone by amending anything.

Which makes this an area where the practitioner's job is mostly to intervene before the client acts.

Four Movements, and Clients Conflate All of Them

A direct rollover — the plan sends the funds to the receiving plan or IRA, or issues a check payable to the receiving custodian. No withholding, no sixty-day exposure, and no frequency limit. This is the correct method in almost every case.

An indirect rollover from a plan — the distribution is paid to the participant, who then deposits it into a plan or IRA. Subject to mandatory withholding and to the sixty-day deadline. Discussed below, because it is where money is lost.

An IRA-to-IRA trustee-to-trustee transfer — the custodians move the funds directly. Unlimited frequency, no withholding, no sixty-day clock.

An IRA-to-IRA sixty-day rollover — the client receives the funds and redeposits them. Subject to the one-per-twelve-month rule, which is the most violated rule in this area.

The practical instruction that prevents most of the damage: always use a direct transfer, for every movement, in every direction. There is essentially no situation where an indirect rollover is the better method for a client who intends to keep the money in a retirement account.

The One-Per-Year Rule

The rule clients and advisers get wrong most often, and the consequence is severe.

An individual may make only one IRA-to-IRA sixty-day rollover in any twelve-month period, and the limitation applies per taxpayer across all IRAs — not per account. A client with four IRAs does not have four rollovers available.

What it does not apply to: trustee-to-trustee transfers between IRAs, which are unlimited; plan-to-IRA rollovers; and conversions to a Roth IRA.

The consequence of violating it: the second distribution is taxable, it cannot be rolled over, and the amount deposited into the receiving IRA is an excess contribution subject to its own penalty until corrected. There is no relief procedure for this — it is not a sixty-day problem that a waiver can address.

Which is the entire argument for trustee-to-trustee transfers. A client who never touches the money cannot violate a rule that applies only to rollovers where they do.

The Withholding Trap

The most common expensive error in plan distributions, and clients never see it coming.

An eligible rollover distribution paid to the participant from a plan is subject to mandatory federal withholding. So a client who intends to roll over a plan balance and takes the distribution personally receives less than the full amount — and to complete a full rollover they must deposit the entire original amount, making up the withheld portion from other funds, within sixty days.

Clients deposit what they received. The withheld amount is then a taxable distribution, potentially with an early distribution penalty, and the tax on it was already partly paid by the withholding — which is why the client's refund the following spring does not cover the damage.

And there is no fixing it after sixty days.

The instruction: never let a client take a plan distribution personally when they intend to roll it. If a client has already done so, the immediate advice is to deposit the full original amount from other resources within the window, which is frequently possible and requires them to be told promptly.

The Sixty-Day Clock

Where an indirect rollover has occurred:

The clock runs from receipt, not from the distribution date on the paperwork.

A waiver may be available where the failure was due to circumstances beyond the client's control, and there is a self-certification procedure for defined circumstances — including certain financial institution errors, a misplaced and uncashed check, serious illness, death in the family, postal error, and others. Confirm the current list and the procedure's requirements.

Self-certification is not automatic relief; it is a procedure permitting the client to complete a late rollover with a written certification, subject to later examination. Document the circumstances contemporaneously.

What Cannot Be Rolled Over

Each of these produces an excess contribution if rolled, which is a second problem stacked on the first.

Required minimum distributions. A distribution that satisfies a required minimum cannot be rolled over. A client who takes their required distribution and "rolls it into an IRA" has made an excess contribution — and this is a common error in the year a client retires, when they take a distribution and roll the balance without segregating the required amount first. The required distribution must come out and stay out.

Hardship distributions.

Corrective distributions, including returned excess deferrals and excess contributions.

Certain periodic payments over a life expectancy or a long term.

Amounts already distributed and outside the sixty-day window.

One that CAN be rolled and clients assume cannot: a plan loan offset. Where a participant separates with an outstanding loan and the plan offsets the loan against the account, the offset amount is generally an eligible rollover distribution — with a special extended deadline in defined circumstances. A client who separated with a loan should be told this promptly, because the amount is frequently substantial and clients assume it is simply lost.

Roth Mechanics Clients Get Wrong

A designated Roth account in a plan rolled to a Roth IRA: the receiving Roth IRA's own five-year clock governs for purposes of qualified distributions, and the plan account's holding period does not carry over the way clients expect. Depending on which clock is longer, this helps or hurts — and it should be checked before the rollover rather than after.

Basis in a designated Roth account does not transfer in the way clients assume either, and the ordering rules for distributions from a Roth IRA differ from those for a designated Roth account.

A conversion — moving pre-tax amounts to Roth — is a taxable event, is not subject to the one-per-year rule, and cannot be undone. The recharacterization of conversions is no longer available, which means a conversion made on an assumption about the year's income cannot be reversed if the assumption was wrong. Convert late in the year, when income is known.

Basis, After-Tax Amounts, and the Pro-Rata Problem

After-tax amounts in a plan can generally be directed separately in a direct rollover — pre-tax amounts to a traditional IRA and after-tax amounts to a Roth IRA — which is a genuinely valuable planning outcome and is only available if someone asks for it before the distribution is processed. Once the amounts are commingled in a traditional IRA, they are not separable.

The pro-rata rule for IRAs treats all traditional, SEP, and SIMPLE IRAs as one pool for determining the taxable portion of any distribution or conversion. Which produces the trap for clients doing a backdoor Roth contribution: a client with a substantial pre-tax IRA balance who makes a nondeductible contribution and converts it does not convert the nondeductible amount — they convert a pro-rata slice, and most of it is taxable.

And the interaction worth knowing: rolling a plan balance into an IRA increases the pre-tax pool and can therefore damage a client's backdoor Roth strategy, while rolling pre-tax IRA money into a plan that accepts it can restore the strategy. That is a consequence of a rollover decision that has nothing to do with the rollover itself, and clients are never told about it.

Leave It in the Plan, or Roll It? Honestly Both Ways

Reasons to leave it in the plan:

Creditor protection, which is generally stronger for employer plan assets than for IRAs, where protection depends substantially on state law.

The separation-from-service exception to the early distribution penalty, available from a plan at a lower age than the general exception — and it does not survive a rollover to an IRA. A client who separates in their fifties and rolls to an IRA has permanently forfeited penalty-free access they had. This is among the most consequential and least-discussed rollover facts.

Institutional pricing and access to funds not available retail, including stable value options with no retail equivalent.

Loan availability, which IRAs do not offer.

The still-working exception to required distributions, which applies to a current employer's plan.

Net unrealized appreciation on employer securities, below.

Reasons to roll to an IRA:

Investment choice, consolidation of scattered accounts, planning flexibility, the availability of qualified charitable distributions from an IRA, more flexible beneficiary administration, and escape from a plan with poor options or high costs.

And the conflict that must be disclosed. A rollover recommendation moves assets to where an adviser is compensated. That makes it an inherently conflicted recommendation, and one requiring a documented comparison of the plan's costs and features against the alternative. A practitioner who recommends a rollover without that analysis in the file has a problem independent of whether the advice was right.

Net Unrealized Appreciation — Irreversible

Worth flagging separately because a routine rollover destroys it permanently.

Where a plan holds appreciated employer securities, a special treatment may allow the participant to take the securities in kind, pay ordinary tax on the plan's cost basis only, and have the appreciation taxed as capital gain when the shares are later sold. For a long-tenured employee with substantial appreciation, the difference can be very large.

Rolling the shares into an IRA forfeits it entirely, and it cannot be recovered. Any client separating from an employer whose plan holds appreciated employer stock needs this analysis before anything is moved — which means the practitioner has to ask what the plan holds rather than waiting to be told.

Structured coverage is available through the retirement plan administration catalog, IRA Essentials, IRA Fundamentals, the Required Minimum Distributions program, the 401(k) Training and Certification Program, HS 326: Planning for Retirement Needs, the Retirement Tax Guide, and the Certificate in Integrated Wealth Planning and Advice.

Reporting, and the Client Who Panics

A direct rollover is still reported — the distribution appears on a distribution statement with a code indicating a direct rollover, and the receiving custodian reports the contribution.

Which produces the annual conversation: a client receives a distribution statement showing a large amount and believes they owe tax on it. The return reports the gross distribution and the rolled amount with the appropriate notation.

The practitioner's job is to reconcile the reporting to what actually happened, and specifically to confirm the code on the statement matches the transaction. A distribution coded as a normal distribution when it was in fact rolled over will generate a notice, and correcting it requires the custodian to issue a corrected statement.

Where This Goes Wrong

Using an indirect rollover when a direct transfer was available
Violating the one-per-year rule, which cannot be fixed
Assuming the one-per-year rule is per account rather than per taxpayer
A client depositing only what they received after mandatory withholding, making the withheld amount taxable
Missing the sixty-day deadline, with no waiver circumstance available
Rolling over a required minimum distribution, creating an excess contribution
Not telling a separating client that a loan offset can be rolled with an extended deadline
Commingling after-tax amounts in a traditional IRA when they could have gone to a Roth
A backdoor Roth conversion made without regard to the pro-rata pool
Rolling a plan balance into an IRA and destroying the client's backdoor Roth strategy
Rolling to an IRA and forfeiting the separation-from-service penalty exception
Rolling appreciated employer securities into an IRA and losing the special treatment permanently
Converting early in the year on an income assumption that proves wrong, with no recharacterization available
Recommending a rollover with no documented comparison of the plan's costs and features
A distribution miscoded on the statement, generating a notice

The summary for a practitioner: use trustee-to-trustee transfers for everything, never let a client take a plan distribution personally when they intend to roll it, segregate the required minimum distribution before moving anything in a retirement year, and — before any separating client moves a plan balance — ask what the plan holds and how old they are. Employer stock and the separation-from-service exception are both destroyed by a routine rollover, and neither can be recovered.

Frequently Asked Questions

What is the one-rollover-per-year rule?

An individual may make only one IRA-to-IRA sixty-day rollover in any twelve-month period, applied per taxpayer across all IRAs rather than per account. It does not apply to trustee-to-trustee transfers, plan-to-IRA rollovers, or Roth conversions. Violating it makes the second distribution taxable, unrollable, and an excess contribution in the receiving IRA — with no relief procedure available.

Why is an indirect rollover from a plan dangerous?

Because an eligible rollover distribution paid to the participant is subject to mandatory withholding, so the client receives less than the full amount and must deposit the entire original amount — making up the withheld portion from other funds — within sixty days. Clients deposit what they received, and the withheld amount becomes a taxable distribution that cannot be fixed after the window closes.

Can a required minimum distribution be rolled over?

No. A distribution satisfying a required minimum cannot be rolled, and rolling it creates an excess contribution. This is a common error in a client's retirement year, when they take a distribution and roll the balance without first segregating the required amount — which must come out and stay out.

What does a client lose by rolling a plan balance to an IRA?

Potentially several things: generally stronger creditor protection for plan assets; the separation-from-service exception to the early distribution penalty, which applies at a lower age from a plan and does not survive a rollover to an IRA; institutional pricing and stable value options; loan availability; and special treatment for appreciated employer securities, which is destroyed permanently once the shares are in an IRA.

How does a rollover affect a backdoor Roth strategy?

The pro-rata rule treats all traditional, SEP, and SIMPLE IRAs as one pool, so rolling a plan balance into an IRA increases the pre-tax pool and can make a backdoor Roth conversion largely taxable. Conversely, rolling pre-tax IRA money into a plan that accepts it can restore the strategy. Clients are almost never told about this consequence of a rollover decision.

What must be documented when recommending a rollover?

A comparison of the plan's costs and features against the alternative, because moving assets to where an adviser is compensated is an inherently conflicted recommendation. A practitioner who recommends a rollover without that analysis in the file has an exposure independent of whether the recommendation was correct.