A 401(k) rollover should be a routine, tax-free transfer. Done wrong, it becomes a taxable event, a penalty, or a permanently lost tax advantage. These are the seven mistakes that turn a straightforward rollover into a financial setback.
Mistake 1: Accepting an Indirect Rollover
What happens: Your plan sends a check to you. The plan withholds 20% ($20,000 on a $100,000 balance). You receive $80,000. To complete the rollover tax-free, you must deposit $100,000 into your IRA within 60 days — meaning $20,000 must come out of your own pocket.
How to avoid it: Always request a direct rollover. The funds go from plan to IRA without passing through your hands. No withholding. No deadline pressure.
Mistake 2: Missing the 60-Day Deadline
What happens: You receive a distribution intending to redeposit it, but life gets in the way — you forget, lose the check, or can’t find a suitable account in time. After 60 days, the entire distribution becomes taxable income. Under 59½? Add a 10% penalty.
How to avoid it: Request a direct rollover. If you already have a check, open an IRA immediately and deposit it — do not wait.
Mistake 3: Rolling Traditional 401(k) to Roth IRA Without Planning for the Tax Bill
What happens: You roll $200,000 to a Roth IRA. You owe tax on $200,000 of ordinary income. In the 22% bracket that is $44,000 — due when you file your return. You did not set aside the money to pay it.
How to avoid it: Never do a Roth conversion rollover without calculating the tax bill first. Have the cash available outside the rollover account to pay the taxes. Consider spreading the conversion across multiple tax years to stay in a lower bracket.
Mistake 4: Forgetting to Check Vesting Before Leaving
What happens: You leave your job with $90,000 in your 401(k) — $60,000 your contributions and $30,000 employer match. You are only 50% vested in the match. You can only roll $75,000. The other $15,000 is forfeited — permanently.
How to avoid it: Check your vesting schedule before your last day. If you are close to a vesting cliff (e.g., 3-year cliff vesting where 100% vests at year 3), consider timing your departure accordingly.
Mistake 5: Forgetting to Invest After the Rollover
What happens: Your $150,000 arrives in your new IRA as cash. You intend to pick investments “soon.” Two years later, it is still sitting in a money market earning 4% while the S&P 500 returned 22%.
How to avoid it: Invest rollover funds within days of arrival — not weeks. A simple target-date fund gets you invested immediately without requiring investment decisions.
Mistake 6: Rolling Over and Then Using the Rule of 55
What happens: You are 57 and just left your job. You need access to retirement funds. You roll your 401(k) to an IRA — then realize you no longer have access to the Rule of 55, which only applies to 401(k) funds at your former employer. Now you need to use 72(t) SEPP or wait until 59½.
How to avoid it: If you plan to retire between 55 and 59½ and need early access to retirement funds, keep money in the 401(k) until you no longer need that option.
Mistake 7: Violating the One-Per-Year IRA Rollover Rule
What happens: You do an indirect IRA-to-IRA rollover in January. Then in August you do another indirect rollover from a different IRA. The second rollover is a violation — it becomes a taxable distribution.
How to avoid it: Use direct transfers (trustee-to-trustee) for IRA-to-IRA moves — these do not count against the one-per-year limit. Only indirect (60-day) rollovers are subject to the rule, and only for IRA-to-IRA moves (not 401k-to-IRA).
The most impactful mistake to avoid is the 20% withholding trap on indirect rollovers — always use a direct rollover. For the rules behind each mistake, see 401(k) rollover tax rules and direct vs. indirect rollover. Return to the 401(k) Rollover Guide hub.
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