The median American worker has been with their current employer for less than four years, according to Bureau of Labor Statistics tenure data. Run a forty-year career at that pace and you can collect ten different retirement accounts along the way, each one making its own decision-free drift if you let it. What happens to a 401(k) when you leave a job depends on choices you make, and a few the plan is allowed to make for you.
The money itself is safe. Everything you contributed is yours immediately, along with any employer match you are vested in. The question is where it lives next, and the four standard options are not equal.
The four options, in rough order of popularity among advisers
Roll it into your new employer’s plan. If the new 401(k) accepts roll-ins, this keeps everything in one tax-deferred pot, preserves strong federal creditor protection, and keeps future paperwork simple. The main check to run first: the new plan’s investment menu and fees, since plans vary widely.
Roll it into an IRA. An IRA offers the widest investment choice and consolidates accounts from multiple old jobs. The trade-offs are real, though often overstated: IRA fees depend entirely on what you buy, and creditor protection is generally somewhat weaker than a 401(k)’s.
Leave it where it is. Usually allowed if the balance is large enough, and sometimes the old plan is genuinely excellent and cheap. The risk is administrative, not financial: people move, plans change recordkeepers, companies merge, and the account quietly loses its owner. Federal enforcement has recovered billions for participants who lost track of benefits this way.
Cash it out. The expensive option, covered below, and the one worth treating as a last resort.
Small balances can be moved without your permission
If you leave behind a small account, the plan does not have to keep it. Under rules updated by the SECURE 2.0 Act, which Congress passed in late 2022, plans may force out balances up to $7,000, raised from the old $5,000 limit starting in 2024. Balances between $1,000 and $7,000 cannot simply be mailed to you; they must be rolled automatically into an IRA set up in your name. Balances under $1,000 can be cashed out and sent as a check, with taxes withheld.
Those automatic IRAs are the fine-print problem. They typically default into conservative, cash-like investments with account fees, which can slowly erode a small balance rather than grow it. If you get a letter about an automatic rollover, claiming the account and moving it somewhere you actually manage is almost always worth the hour it takes.
The 60-day trap, and how to step around it
There are two ways to move retirement money, and they are not equally safe. In a direct rollover, the old plan sends the money straight to the new plan or IRA. Nothing is withheld and nothing can go wrong on your kitchen table.
In an indirect rollover, the check comes to you, and the clock starts. IRS rules give you 60 days to redeposit the full amount into another retirement account, and the plan is generally required to withhold 20 percent of a payout from an employer plan for taxes. That means to roll over the full balance, you must replace the withheld 20 percent out of pocket and recover it at tax time. Miss the deadline and the entire amount becomes a taxable distribution. The rule of thumb is blunt: always ask for the direct, trustee-to-trustee transfer, and never let the check be made out to you personally.
What cashing out really costs
A cashed-out 401(k) is taxed as ordinary income in the year you take it, and if you are under 59 and a half, the IRS generally adds a 10 percent early-distribution tax on top. One exception matters for job changers specifically: if you leave your employer in or after the year you turn 55, distributions from that employer’s plan escape the 10 percent penalty, though not regular income tax. Even then, the quiet cost is the decades of compounding the money will never do. A five-figure cash-out in your forties is a six-figure hole at retirement.
Finding the accounts you already lost
If reading this surfaced a memory of a 401(k) from three jobs ago, the government now runs a search tool for exactly that. The Department of Labor’s Retirement Savings Lost and Found, created by SECURE 2.0 and launched in late 2024, lets you log in through Login.gov and search by Social Security number for benefits plans still owe you. Old plan statements, former HR departments, and your state’s unclaimed property office are the backup routes.
The cleanest habit, though, is not needing the lost and found at all. Decide where the money goes within a month or two of any job change, insist on a direct transfer, and keep the number of accounts you own small enough to remember.
This article was produced with AI assistance and reviewed by a human editor. Figures are linked to their primary sources; where a claim could not be verified from the public record, we say so.
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