Moving a 401(k) into an IRA is one of the most common financial steps a person takes when leaving a job or retiring, and it is usually tax-free. But there is a wrong way to do it that hands the government a fifth of the account for months and can, if a person slips, turn a routine rollover into a taxable event with penalties. The difference comes down to how the money travels from the old plan to the new account.
The 20% withholding trap on a rollover check
When a person asks a 401(k) plan to pay the balance directly to them, even with the stated intent of rolling it into an IRA, the plan is required to withhold 20% for federal taxes. The Internal Revenue Service mandates this withholding on eligible rollover distributions paid to the account owner. So a worker who requests a check for a $100,000 401(k) receives only $80,000; the plan sends $20,000 to the government.
The withholding by itself does not end the tax deferral, but it creates a problem. To complete a full tax-free rollover, the person has to deposit the entire original amount into the IRA, including the 20% that was withheld, using other money to make up the difference. In the example, that means depositing the full $100,000, even though only $80,000 arrived, and waiting to recover the withheld $20,000 as a refund or credit when filing taxes the following year.
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Miss the 60-day window and the rollover becomes taxable
The trap deepens because of a deadline. A person who takes a distribution has 60 days to redeposit the money into another retirement account, or the amount not rolled over is treated as a taxable withdrawal. If the worker in the example cannot come up with the withheld $20,000 from other savings within 60 days, that portion is counted as a taxable distribution.
For someone under age 59½, that taxable amount can also carry an additional 10% early-withdrawal penalty on top of ordinary income tax, as the rules on rollovers explain. A move that was supposed to be a seamless transfer becomes a partial cash-out, taxed and penalized, all because the money passed through the account owner’s hands instead of going straight from one custodian to another.
The direct transfer that avoids all of it
There is a clean way to move the money. A direct rollover, sometimes called a trustee-to-trustee transfer, sends the funds straight from the 401(k) plan to the IRA custodian without the owner ever taking possession. Because the person never receives the money, no 20% withholding applies, there is no 60-day clock to beat, and the full balance keeps growing tax-deferred the whole way.
The distinction that matters is who the check is made out to. A check payable to the individual triggers the withholding and the deadline. A check payable to the receiving IRA custodian for the benefit of the individual is treated as a direct rollover and sidesteps both problems, even if the check is physically mailed to the account owner to forward. The Internal Revenue Service publishes a rollover chart showing which account types can be rolled into which, and the direct method works across the common combinations retirees use.
It helps to follow the $100,000 example all the way through. In an indirect rollover, the plan sends $80,000 and forwards $20,000 to the government. To avoid tax, the account owner must deposit a full $100,000 into the IRA within 60 days, finding the missing $20,000 from a checking or savings account, and then wait until filing the next year’s return to recover that $20,000 as part of a refund or a smaller tax bill. Anyone who cannot front the cash ends up rolling over only $80,000, leaving the withheld $20,000 treated as a taxable distribution, plus a 10% penalty if under 59½. A direct rollover avoids the whole exercise: the plan reports it on a Form 1099-R with a distribution code showing a direct rollover, and no tax is due. Unlike the once-per-12-month cap that limits indirect IRA-to-IRA rollovers, trustee-to-trustee transfers can be done as often as needed, so a retiree consolidating several old accounts can move them all directly in the same year without tripping any limit.
How to keep a rollover clean
The safest approach is to open the receiving IRA first, then instruct the 401(k) plan to send the money directly to that account. Being explicit with the plan administrator that the goal is a direct rollover, not a distribution, is what keeps the 20% from being withheld. Many plans default to cutting a check to the participant unless told otherwise, so the instruction has to be deliberate.
There is also a limit worth knowing on a related maneuver. A person is generally allowed only one IRA-to-IRA rollover using the 60-day method in any 12-month period, a rule that does not apply to direct trustee-to-trustee transfers or to rollovers between a 401(k) and an IRA. That once-a-year cap is another reason planners steer clients toward direct transfers, which have no such restriction and no withholding.
For a retiree consolidating old workplace plans into a single IRA, the stakes are simply too high to leave to a check in the mail. Asking one question, whether the money will move directly to the new custodian, is what separates a tax-free rollover from a costly mistake that the 60-day clock will not forgive.
This article was researched and drafted with the assistance of AI and reviewed by The Financial Wire editorial team.
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Warren Cohen is a finance writer based in Phoenix, Arizona, covering personal finance topics including credit, banking, and beginner investing. He earned his degree in business administration from Arizona State University and began his career working in consumer finance, where he gained direct experience with lending and credit systems. He now writes for personal finance websites and fintech platforms, focusing on clear, practical content that helps readers make informed financial decisions.
