I switched jobs. What do I do with my old 401(k)?
You changed jobs a few months ago. The 401(k) from the old place is still sitting there — you haven’t touched it, and nobody is making you. It is easy to leave the decision unmade. But “unmade” is its own choice, and a couple of the ways this goes wrong start with doing nothing.
It is still your money, still working.
Leaving a job doesn’t touch the balance. The money stays invested, keeps growing, and keeps its tax shelter — it is yours no matter who signs your paycheck now. Moving it to a better home is not a taxable event either, as long as you move it the right way.
So most of this decision is low-stakes: three of your four options keep the money invested and differ mostly by convenience. Only two things can hurt you here, and neither is the obvious one. The first is cashing the account out. The second is a paperwork trap on the way to a better home. Once you can see both, the rest is easy.
Four doors.
When you leave a job, your old 401(k) has exactly four places it can go. Three of them are fine — the choice between them is a matter of taste. The fourth is the one that does the damage.
Four doors, one you don't walk through.
Three of these keep your money invested and are mostly a matter of taste. The fourth is the only one that does real damage — so the door you pick matters less than the one you don't.
Leave it where it is.
Do nothing and the old plan keeps the money invested and tax-sheltered. The catch: you can't add to it, it's one more account to keep track of, and some plans charge higher fees once you're no longer an employee.
Roll it into your new 401(k).
If your new job has a plan that accepts rollovers, move the old balance in so everything sits in one place under one login. The tax shelter carries straight over.
Roll it into an IRA.
Move it into an Individual Retirement Account you open and control — usually the widest fund choice and the lowest fees of the four. For most early-career savers this is the default.
Cash it out.
Take the balance as a check. It's the one door that can't be undone — and the only one that costs you. Before 59½ you lose a 10% penalty plus income tax off the top, and the money stops growing for good.
Notice where the numbers are. The three good doors don’t carry a dollar cost because, between them, there isn’t much of one — they all keep the money invested. The whole cost of this decision lives behind the fourth door. So the door you pick matters far less than the one you don’t.
The one door you don’t walk through.
Cashing out feels like found money — a check for thousands of dollars, yours today. But before age 59½ the government takes a 10% early-withdrawal penalty off the top, and the whole balance gets added to your income for the year and taxed. On a $12,000 balance in the 22% bracket, that is roughly a third gone before the money reaches your account: you pocket about $8,160.
The penalty and the tax are the part you can see. The part you can’t is the bigger one. That same $12,000, left invested from your early thirties to 65 at a 7% long-run return, grows into roughly $138,000. Cashing out doesn’t cost you $3,840 in penalty and tax — it costs you the $138,000 the money was on its way to becoming. You are trading an army of future dollars for one small check today.
One assumption worth naming: this example is a regular pre-tax 401(k), the most common kind, where the whole balance is taxable on the way out. If yours is a Roth 401(k), the money you put in comes back without tax or penalty and only the growth is hit — but either way, cashing out throws away the future above, which is the real loss.
There is an honest exception. If you are in a true emergency — the rent that keeps you housed, a medical bill you cannot otherwise cover, and there is nothing else left to reach for — then a small old balance can be the wall between you and something worse. That is a last resort, not a convenience. For everything short of it, the other three doors are open.
The trap for people doing it right.
Say you skip the cash-out and decide to move the money. There is still one way to turn a smart choice into a tax bill. You call the old plan, tell them you want to move your 401(k), and they mail you a check. That check is already short: the plan is required to withhold 20% for taxes before it leaves. Now a 60-day clock starts. To complete the move tax-free, you have to deposit the full original amount into the new account within 60 days — including the missing 20%, which you have to cover out of your own pocket until a completed rollover refunds it at tax time. Miss the deadline, or only redeposit the short check, and the shortfall becomes a withdrawal: taxed, and penalized if you are under 59½.
There is one phrase that sidesteps all of it. Ask for a direct rollover — a trustee-to-trustee transfer, where the old plan sends the money straight to the new account and you never touch it. No 20% withholding, no 60-day clock, no chance to trip. Say “direct rollover” and mean it; if a check ever shows up in your name, something went the wrong way. The guide to IRAs walks through the exact mechanics on the receiving end.
Doing nothing has a deadline, if the balance is small.
Leaving the money where it is can be a fine choice — but it is not always yours to make. If your old balance is small, the plan is allowed to push you out. Balances between $1,000 and $7,000 can be force-rolled into an IRA the plan chooses for you, often a low-yield default account that quietly stops growing. Under $1,000, the plan can simply cut you a check. Like the trap in the last panel, that check arrives 20% short, and you have the same 60-day window to deposit the full amount into an IRA before the shortfall becomes a taxed, penalized withdrawal.
So if you are sitting on a small old account, inertia isn’t neutral. Make the move yourself, on your terms, before someone makes a worse one for you.
Picking among the three good doors.
For most people early in their careers, the default is a direct rollover into an IRA: it usually has the widest choice of low-cost funds and the lowest fees of the four, and it is one account that follows you from job to job for the rest of your life. Start there unless one of these is true:
- Your new plan is genuinely great — excellent, cheap funds and a low fee — and you would rather keep everything under one login. Then roll it into the new 401(k), after a quick check that it accepts incoming rollovers (not every plan does; HR can confirm in a sentence).
- The balance is tiny and you’ll forget it. Rolling it into your current 401(k) or a single IRA keeps it from getting lost or forced out.
Two quick notes whichever door you take. Employer match dollars that haven’t vested yet (you haven’t worked there long enough to fully own them) don’t come with you — only what is already yours. And the tax character carries over: a Roth 401(k) rolls into a Roth IRA, a regular (pre-tax) 401(k) into a traditional or rollover IRA, so you never accidentally create a tax bill by mixing the two. Not sure which kind you have? Your latest statement says.
One move this week.
The account will still be there next month, and so will the chance to get this wrong by leaving it. So close the loop now.
If you don’t have an IRA yet, open one first — a fifteen-minute task (here’s how), and it is the account this money has been waiting for. If your broker lists both a “Rollover IRA” and a plain “Traditional IRA,” either one holds pre-tax money the same way, so pick whichever. Then call the old plan (the number is on your latest statement), say the words “I want a direct rollover into my IRA,” and have the receiving account number ready so they can send it straight there. Lost track of the old account? Your former employer’s HR or benefits administrator can point you to it, and an old pay stub or W-2 names the provider. The balance you built is still working for you; don’t let a phone call you never made turn it into a tax bill.
An old account is not a lost account.
A 401(k) you left behind is still your money, still invested, still growing. Three of its four doors keep it that way and differ only by convenience — so the decision people agonize over barely matters. The two that do matter are the ones nobody warns you about: don’t cash it out, and when you move it, move it as a direct rollover so the check never lands in your hands.
- Leaving a job doesn’t touch the balance — it stays invested and tax-sheltered until you decide.
- Four doors: leave it, roll to the new 401(k), roll to an IRA, or cash out. Only cashing out is irreversible.
- Cashing out a $12,000 balance nets about $8,160 now and gives up roughly $138,000 at 65 — a true emergency is the only honest exception.
- If they mail you the check, 20% is withheld and a 60-day clock starts; redeposit the full amount or the shortfall is a taxed, penalized withdrawal.
- Always ask for a direct, trustee-to-trustee rollover — no withholding, no clock, no way to trip.
- Small balances ($1,000–$7,000) can be forced out, so inertia isn’t neutral; the IRA is the usual default among the three good doors.