What are the pros and cons of a 401k to IRA rollover?

Rolling your 401(k) into an IRA when you leave a job is standard advice. Standard advice is calibrated for the median case. For people with complex tax strategies, early retirement timelines, or concentrated company stock, the default answer is occasionally the expensive one.

Here's when the rollover makes sense, and four scenarios where it doesn't.

The argument starts with fees. The average 401(k) plan charges between 0.37% and 1.42% annually in total plan costs. An IRA at Fidelity, Schwab, or Vanguard gives you institutional-class index funds at 0.02% to 0.04%. Over 20 years, the difference between a 0.05% and a 0.80% expense ratio on a $500,000 account compounds into roughly $180,000 in lost wealth. That's not a rounding error.

Beyond fees, most employer plans offer 15 to 30 fund options. Some are excellent. Many aren't. An IRA expands your investment universe to essentially everything: individual stocks, ETFs, REITs, options strategies. And if you've changed jobs multiple times, consolidating orphaned 401(k)s into a single IRA eliminates the administrative drag of managing four separate accounts across four custodians.

For most people, this is enough. Roll it over.

If you earn too much to contribute directly to a Roth IRA, you're probably using the backdoor Roth strategy, or planning to. Rolling a pre-tax 401(k) into a traditional IRA can quietly destroy it.

The IRS pro-rata rule doesn't look at your $7,000 after-tax contribution in isolation. It looks at your entire traditional IRA balance. If you've rolled $400,000 of pre-tax money into an IRA and then contribute $7,000 after-tax, about 98.3% of any conversion you make is taxable. Your "clean" Roth conversion just became a $6,881 taxable event. Multiplied over years, the cumulative cost is significant.

The fix: keep the 401(k) where it is, or roll it into your new employer's plan rather than an IRA. Many plans accept incoming rollovers. Ask HR before you assume otherwise.

Most people don't know this provision exists until they've already forfeited it.

If you leave your employer in the calendar year you turn 55 or older, you can withdraw from that specific 401(k) penalty-free. No 10% hit. No waiting until 59½. The moment you roll it into an IRA, that window closes. IRAs require you to wait until 59½.

If you're 56, leaving a demanding career on your own terms with $800,000 in a 401(k), a reflexive rollover locks your own money behind a four-year wall you didn't know you were building. For anyone pursuing financial independence before the conventional retirement age, this provision can determine whether the timeline is actually viable.

If your 401(k) holds heavily appreciated company stock, the rollover math shifts substantially.

A provision called net unrealized appreciation (NUA) lets you take a lump-sum distribution of company stock and pay ordinary income tax only on the original cost basis. The appreciation above that basis gets taxed at long-term capital gains rates when you sell, not at ordinary income rates.

The gap between those rates (up to 37% vs. 0%, 15%, or 20% depending on income) can be enormous. On $450,000 of appreciation above a $50,000 cost basis, the tax difference between a rollover and an NUA strategy can run into six figures.

A rollover makes NUA impossible. Once the shares move into an IRA, they lose their cost basis identity and all future distributions become ordinary income. The window closes permanently.

ERISA-qualified 401(k) plans carry robust federal creditor protection. In bankruptcy, those assets are almost entirely shielded, consistently across states.

IRA protection is a patchwork. Federal bankruptcy protection caps at approximately $1.5 million. Beyond that threshold, assets can be exposed. Outside of bankruptcy, protection depends entirely on state law, and states vary considerably. For a physician in a high-liability specialty or a business owner with personal guarantees on commercial debt, the asymmetry between ERISA and state-law IRA protection is worth understanding before you consolidate.

Roll over your 401(k) if fees are high, investment options are limited, and none of the above scenarios apply to you. That's most people.

Before you sign the paperwork, four questions: Do you run a backdoor Roth strategy with existing traditional IRA money? Are you close to 55 and planning an early exit? Does your 401(k) hold significantly appreciated company stock? Does your profession carry meaningful litigation exposure?

One yes changes the analysis. The financial industry loves default rules because they scale. A good advisor earns their fee when the default rule would have been the expensive choice.