A new job carries its own momentum. There's the role to grow into, the people to get to know, the mix of excitement and adjustment a new chapter brings. Beneath all of it sits a smaller, unfinished decision from the place you just left: what to do with your old 401(k).
You have four options: leave it in your old plan, move it into your new employer's plan, roll it into an IRA, or cash it out. The best choice depends on your balance, the plans available to you, and your own goals.
Key takeaways
When you leave a job, you have four choices for your 401(k): leave it, move it to your new plan, roll it to an IRA, or cash out.
There's no universally correct option. The right one depends on your balance, your new plan's quality, fees, and your goals.
A direct rollover avoids the 60-day deadline and the mandatory 20% withholding that comes with a check made out to you.
Cashing out before age 59½ usually means income tax plus a 10% penalty, often the most expensive path.
Small balances can be moved out without your consent, so an account left untended isn't always left alone.
What happens to your 401(k) when you leave a job?
It helps to begin with a reassurance: nothing dramatic happens to your 401(k) the moment you leave. The money is yours, it stays invested exactly as it was, and it doesn't revert to your employer. Two things do change: you can no longer contribute to it, and you stop receiving any employer match.
Vesting is worth checking before you leave. Any part of the employer match that hasn't vested yet may be forfeited when you go. Your own contributions are always fully yours, but a match on a graded vesting schedule may only be partly earned, so if you were close to a milestone, it's useful to know what leaving costs.
Your balance matters too. A plan can move small balances out without your consent: accounts between $1,000 and $7,000 may be automatically rolled into an IRA opened in your name, and balances under $1,000 may be sent to you as a check. So an account you've stopped thinking about isn't always left undisturbed.
Your four options for an old 401(k)
These are the four paths, and each has its own trade-offs. The right one is the one that fits your situation.
Leave it in your former employer's plan
This is the simplest path, since it requires no action at all. Large employer plans can carry low-cost institutional funds you won't find elsewhere, and 401(k) money has strong protection from creditors.
What you give up is momentum: you can't add to it, you're limited to that plan's investment options, and an account you've stopped watching is easy to lose track of. Most plans let you stay if your balance is above $5,000 to $7,000.
Move it to your new employer's plan
If your new plan accepts rollovers, bringing the old account over keeps everything in one place and preserves the 401(k) structure, including eligibility for the Rule of 55. The trade-off is that you take on the new plan's investments and fees, whatever they happen to be.
Roll it into an IRA
An IRA opens a much wider range of investments and often lower fees, with full control of the account. Some trade-offs are that IRAs generally offer less creditor protection than a 401(k), you lose access to plan loans, and you'll want a direct trustee-to-trustee transfer to keep the move tax-free.
Cash it out
The money is available right away, which can be the deciding factor if you need it, whether for an emergency, a large expense, or to cover a gap in income between jobs. Cashing out a 401k has a cost though.
Before age 59½, a cash-out is generally taxed as ordinary income and carries a 10% early-withdrawal penalty on top. On a $50,000 traditional balance taxed in a 24% bracket, that's roughly $12,000 in tax and a $5,000 penalty, leaving about $33,000 of the original $50,000. (Figures are illustrative and exclude state tax.)
Cashing out carries the highest immediate cost of the four, and whether it's worth it depends on what you need the money for.
How long do you have to roll over a 401(k)?
There's no deadline to simply decide, so you can take your time. But the moment you take a distribution, a clock starts: you have 60 days to move that money into another retirement account, or it becomes a taxable withdrawal.
The distinction that protects you here is between a direct and an indirect rollover, and it matters more than almost anything else. A direct, trustee-to-trustee transfer moves the money straight from one account to the other. Nothing is withheld, and the 60-day clock never starts.
An indirect rollover is where mistakes tend to happen.
Say you ask for $50,000 from your old plan as a check made out to you. The plan is required to withhold 20%, so $10,000 goes to the IRS and you receive $40,000. To complete the rollover tax-free, you still have to redeposit the full $50,000 within 60 days, which means covering that missing $10,000 from your own pocket and reclaiming it later at tax time.
If you miss the window, the whole amount becomes taxed and penalized. The direct transfer sidesteps all of it, which is why it's usually the one to ask for.
How to find an old 401(k) you've lost track of
If you've changed jobs more than once, there may be an account out there you've half-forgotten. It's common, and reassuring to know the money is still yours to reclaim whenever you go looking.
Begin with what you have: old plan statements, your former employer's HR or benefits team, or the plan administrator named on any paperwork you kept. If the company has since merged or closed, a couple of public tools exist for exactly this moment. The Department of Labor's Retirement Savings Lost and Found database and the National Registry of Unclaimed Retirement Benefits can both help reconnect you with a plan.
Forgotten accounts slowly lose ground to fees, and small ones can be cashed out automatically without your noticing, turning years of patient saving into a check that arrives and disappears.
What it costs: taxes and penalties
Here's the part that brings most people relief: moving money between retirement accounts usually isn't a taxable event, as long as it's done the right way. A direct rollover from a traditional 401(k) into a traditional IRA, or from a Roth 401(k) into a Roth IRA, generally moves the money without triggering any tax.
Two exceptions are worth remembering.
Rolling a traditional 401(k) into a Roth IRA is a conversion, which means paying income tax on the amount now in exchange for tax-free growth later. Whether that trade is worth it depends on your tax bracket today versus the one you expect in retirement, the same question at the heart of a backdoor Roth conversion.
And cashing out, as we covered, brings ordinary income tax plus the 10% early-withdrawal penalty before 59½, with one meaningful exception: the Rule of 55, which lets people who leave their job at 55 or older draw penalty-free from that specific employer's plan.
Making the decision
The decision on what to do with an old 401(k) depends on everything around it: the new compensation you're stepping into, the accounts you already have, your age, your tax year, and the goals beneath all of it.
This is where a second perspective earns its place. A good fiduciary advisor won't push you toward any one option. The value is in setting the four choices against your actual life, so the decision is one you make on purpose.
At Arca, a job change is one of the transitions we help clients work through. We consider the old 401(k) alongside your new compensation, the accounts you already have, and the goals ahead, then help you weigh the options so the decision is informed and entirely yours. If you find yourself in this situation, start a conversation with our team. We’re here to help.
Frequently asked questions
Is it bad to just leave my 401(k) with my old employer?
Not necessarily. If the plan has low fees and strong investment options, leaving it can be a reasonable choice. The main risks are losing track of the account over time and being unable to contribute further.
Will I lose my employer match if I leave before I'm vested?
You may lose the unvested portion. Your own contributions are always fully yours, but employer matching often vests on a schedule, and any part you haven't earned yet can be forfeited when you leave. Check your plan's vesting schedule before you go.
My balance is small. Can my old employer force the money out?
Yes. Plans can move out balances up to $7,000 without your consent. Balances between $1,000 and $7,000 are generally rolled into an IRA in your name, and amounts under $1,000 may be sent to you as a check, which can trigger taxes and penalties if you don't redeposit it.
What happens to my 401(k) loan if I leave my job?
An outstanding 401(k) loan typically becomes due when you leave. If you don't repay it, the remaining balance is usually treated as a distribution, meaning income tax and, if you're under 59½, a 10% penalty. Many plans now give you until that year's tax-filing deadline to repay or roll over the balance.
Can I roll a traditional 401(k) into a Roth IRA, and what's the tax hit?
Yes, but it counts as a conversion. You'll owe income tax on the amount you convert in the year you do it, in exchange for tax-free growth and withdrawals later. Whether it makes sense depends on your current tax bracket versus your expected bracket in retirement.
Should I roll into my new employer's plan or an IRA?
It depends on the quality of the new plan. If it offers low fees and strong investments, consolidating there keeps things simple and preserves 401(k) features like plan loans and the Rule of 55. An IRA offers more investment choice and control. The better option is the one that fits how you want to manage the money.