Changing Jobs? The Four Things You Can Do With Your Old 401(k)
Contents
Every job change comes with a quiet financial decision most people settle by default: what happens to the old 401(k)? There are exactly four options, and while cashing out is the obviously bad one, the other three are closer calls than the standard advice suggests. Here's the honest comparison.
Option 1: Leave it where it is
Balances over $7,000 can generally stay in the old plan forever. Doing nothing is underrated when the old plan is good — large employers often negotiate institutional fund fees (0.02-0.05%) cheaper than anything retail, and 401(k)s carry stronger creditor protection than IRAs in many states. Two more niche advantages: money in a 401(k) is invisible to the backdoor Roth pro-rata rule, and the rule of 55 lets you tap your current employer's plan penalty-free if you leave at 55+ — but old plans qualify too if that's where you separated.
The downsides are practical: another login to forget, another beneficiary form to keep current, no new contributions, and some plans quietly charge ex-employees admin fees. Orphaned accounts are how billions in retirement money gets lost track of — if you leave it, calendar an annual check.
Best for: people whose old plan has excellent funds and fees, high earners doing backdoor Roths, and anyone leaving a job at 55-59½ who might want penalty-free access.
Option 2: Roll it into the new employer's plan
Consolidation has real value: one account, one allocation to manage, one RMD stream later. Rolling old money into the new plan also preserves the backdoor-Roth cleanliness and pools everything where the rule of 55 will apply if you leave that employer late in your career.
The catch: the new plan must accept roll-ins (most do), and its fund menu and fees set the ceiling on your money. A new plan with 0.8% target-date funds is a worse home than an IRA at 0.03%. Check the expense ratios before initiating — the fee impact calculator shows what a half-percent difference compounds into over 25 years (spoiler: six figures on a large balance).
Best for: people whose new plan is solid, anyone who values one-account simplicity, and future backdoor-Roth users.
Option 3: Roll it into an IRA
The IRA wins on control: the entire fund universe at near-zero cost, no plan administrator's menu, easier Roth conversions in low-income years, and consolidated old accounts from every past job in one place.
What the standard advice underplays: IRAs lose three 401(k) perks. The rule of 55 doesn't apply (IRA penalty-free access starts at 59½, full stop, outside 72(t) schedules). Creditor protection is weaker in some states. And every pre-tax IRA dollar contaminates the backdoor Roth's pro-rata math — a $200,000 rollover IRA makes future backdoor contributions ~95% taxable. High earners planning backdoor Roths should think twice before the "obvious" IRA rollover.
One more warning: rollover IRAs are where sales pressure concentrates. The person cold-calling about "helping with your rollover" typically earns a commission on what you buy next. A rollover into a self-directed IRA at a major low-cost brokerage, invested in broad index funds, captures the option's whole value; a rollover into a 1.5%-fee managed product destroys it.
Best for: people with mediocre old and new plans, retirees consolidating, and investors who want full control — and who aren't doing backdoor Roths.
Option 4: Cash it out (the $60,000 mistake)
Roughly 40% of job-changers take some or all of the balance as cash. The arithmetic is grim: taxes plus the 10% penalty consume 30-45% immediately — the early withdrawal calculator prices your exact case — and the compounding you surrender is worse. An $8,000 cash-out at 30 nets ~$5,000 after the IRS is done, and costs roughly $60,000 of age-65 wealth at 7% returns. Small balances are the most-cashed and the most costly per dollar, because they have the most decades ahead of them.
The one defensible version: genuine crisis, after pricing a 401(k) loan from the new plan, a 0% balance transfer, and Roth IRA contribution withdrawals — all usually cheaper.
However you roll: make it a DIRECT rollover
The mechanics matter more than the choice. A direct (trustee-to-trustee) rollover — money wired straight between institutions, or a check made out to the receiving custodian "FBO your name" — triggers no tax, no withholding, no deadline.
An indirect rollover — a check made out to you — starts a trap: the plan must withhold 20% for taxes, and you have 60 days to deposit the full original amount (including the withheld 20% you never received — you front it from savings and recover it at tax time) into the new account. Miss the deadline or deposit only the 80% you got, and the difference becomes a taxed, penalized withdrawal. There is no good reason to choose this. Ask for direct, every time.
Two more mechanics: employer stock in the old plan may qualify for NUA treatment (capital-gains rates on the appreciation — worth a professional's opinion before rolling), and Roth 401(k) money rolls to a Roth IRA, where it also escapes the five-year clock confusion if the Roth IRA is already established.
The decision in one pass
Ask three questions. Is either plan exceptionally cheap or expensive? Fees trump everything at 25-year horizons. Will I do backdoor Roth contributions? If yes, keep pre-tax money in a 401(k) — old or new. Might I retire between 55 and 59½? If yes, the plan where you'll separate deserves the balance. If none of those bind, roll to wherever you'll actually pay attention — the retirement savings calculator only compounds the money you don't lose track of. And whatever you choose, choose something deliberately: the default path — forgotten accounts and mailed checks — is the only genuinely wrong answer.