Here’s What to do with Your 401(k) When You Get a New Job

You changed jobs. Congratulations. Your old 401(k) is now sitting in a corner, blinking, waiting for instructions. You have four options for what to do with it – and one of them is a financial disaster that will quietly delete six figures from your future net worth.

Here’s how to pick the right move, plus the rollover mechanics nobody explains until you’ve already messed them up.

Your Four Options at a Glance

• Leave it with your old employer
• Roll it into your new employer’s 401(k)
• Roll it into a traditional IRA (often with a robo advisor)
• Cash it out (don’t)

Three of these are defensible. One is the most expensive mistake retail investors make. Let’s go through them in order.

Option 1: Leave It With Your Old Employer

The path of least resistance. Under SECURE 2.0 rules, if your balance is over $7,000, your old employer has to leave it alone. They can’t auto-cash you out or push you into a default IRA. Below $7,000 they can force you out, and below $1,000 they can mail you a check (which triggers the cash-out tax bomb if you don’t redeposit it within 60 days – more on that below).

Pros: Zero work. If your old plan has access to institutional share classes – the ultra-low-fee versions of mutual funds normal humans can’t buy retail – you might actually be paying lower expense ratios than you’d get in an IRA.

Cons: It’s a stranded asset. You can’t add new money. You’ll forget about it. In ten years you’ll be hunting through old emails trying to remember which recordkeeper had the account. Account aggregation is harder, rebalancing across your full portfolio is harder, and if the company gets acquired or shuts down the plan, you’re going to deal with it under time pressure anyway.

Who it’s for: People with genuinely excellent old plans – rare federal TSP-style fee structures, or institutional share classes you can’t replicate. Otherwise, move it.

Option 2: Roll It Into Your New Employer’s 401(k)

Consolidate into the new plan. Most modern plans accept incoming rollovers and the new HR team can usually walk you through the paperwork.

Pros: One account to track. Future 401(k) loans (if your plan allows them) are calculated against a bigger balance. Keeps your money inside ERISA-protected territory, which matters for creditor protection. And if you ever want to do a backdoor Roth IRA later, having zero pre-tax dollars in IRAs makes the math clean.

Cons: You’re stuck with whatever fund menu the new plan picked. If the new 401(k) is a fee-laden mess full of high-expense-ratio target-date funds, you’re trading freedom for tidiness.

Who it’s for: People who like one statement, want loan access, or plan to do backdoor Roth contributions and need their IRA balance at zero.

Option 3: Roll It Into a Traditional IRA

This is the default choice for most people, and for good reason. A traditional IRA opens up the entire investing universe – every ETF, every mutual fund, every individual stock – at a fraction of the cost of most 401(k) plans.

Pros: Way more investment options. Lower fees in almost every case. You control the account directly. You can convert chunks to a Roth IRA over time (Roth conversion ladders are a real strategy, especially in low-income years). You can pick the custodian based on what you actually need – hands-off automation, full DIY, or anything in between.

Cons: IRAs lose ERISA’s federal creditor protection. State law fills the gap, and most states protect IRAs reasonably well, but the protection is weaker and more variable than a 401(k). If you have a pre-tax IRA balance, future backdoor Roth contributions get messy because of the pro-rata rule. And 401(k) loans don’t exist for IRAs – if you ever needed to borrow from your retirement account, that option goes away.

Who it’s for: Almost everyone. Especially anyone whose new 401(k) has mediocre fund options or high fees, anyone who wants automation, and anyone who likes the idea of consolidating multiple old 401(k)s into one place.

Where to Roll if You’re Going the IRA Route

If you don’t want to manage investments yourself – and most people shouldn’t, because most people will tinker themselves out of returns – a robo advisor is the cleanest landing spot. They build the portfolio, rebalance it, harvest tax losses where applicable, and stay out of your way.

• Betterment – the original. Hands-off, goal-based, solid for set-and-forget rollovers.
• Wealthfront – similar territory, strong tax-loss harvesting, good for taxable money too if you have it.
• M1 Finance – more control via custom “Pies”, platform fee around $3/month (waived above $10,000 in assets).
• SoFi – free management, fewer bells and whistles, fine if you’re already in the SoFi ecosystem.
• Fidelity Go – free under $25,000, then a flat fee. The legacy-brokerage option for people who want the Fidelity name on the account.

Not sure which is right? Start with our best robo advisors overall roundup, or the best picks for beginners if this is your first rollover.

Option 4: Cash It Out (The One You Don’t Do)

You can take the money. You probably shouldn’t.

If you’re under 59 1/2, cashing out triggers three separate hits at once:

• A 10% early withdrawal penalty
• Ordinary income tax on the full amount, at your marginal rate
• Permanent loss of every dollar of future compounding on that money

The Worked Example

Say you’re 30, you switch jobs, and your old 401(k) has $20,000 in it. You decide to cash it out and put it toward a kitchen remodel.

• 10% early withdrawal penalty: $2,000
• Federal income tax at, say, the 22% bracket: roughly $4,400
• State income tax in most states: another $800 to $1,500
• Total taxes and penalty today: around $6,000 to $8,000
• Money actually hitting your bank account: roughly $12,000 to $14,000

That’s the visible cost. The invisible cost is worse. That $20,000 left alone for 35 years at a 7% real return becomes about $213,000 in today’s dollars by age 65. You didn’t spend $20,000 on the kitchen. You spent $213,000.

This is the single most expensive mistake retail investors make at job changes. Don’t be the statistic.

Rollover Mechanics: Direct vs Indirect

If you’re rolling over to anywhere – new 401(k) or IRA – there are two ways the money can move. Pick the right one or you’ll create problems for yourself.

Direct Rollover (Trustee-to-Trustee)

The old plan sends the money straight to the new account. No check made out to you. No taxes withheld. No 60-day clock. This is the only sane way to do a rollover. Every robo advisor and brokerage will handle the paperwork for you – you fill out a one-page transfer form, they call your old recordkeeper, the money shows up a few weeks later.

Indirect Rollover (The Trap)

The old plan sends the check to you. Now you’re on a clock – you have 60 days to deposit the full amount into the new account or the IRS treats it as a cash-out, with all the penalties and taxes that implies.

Here’s the gotcha that catches people: on an indirect rollover from a 401(k), the plan is required to withhold 20% for federal taxes. You only get 80% of your balance in the check. But to complete a full rollover, you have to deposit 100% of the original balance into the new account within 60 days – meaning you have to come up with the missing 20% out of your own pocket and wait until tax time to get it back as a refund.

If your balance is $20,000, the check is $16,000. You have to deposit $20,000 in the new IRA. You have to find $4,000 in cash to make that work. Most people don’t, and they end up partially cashed out by accident.

Just do the direct rollover. Always.

How to Actually Decide

Short version:

• Old plan has excellent low-fee institutional funds and you’ll remember it exists: leave it.
• New plan is solid and you want simplicity (or you do backdoor Roth): roll into the new 401(k).
• Anything else: roll into an IRA, ideally at a robo advisor that handles the move for free.
• Cash out: never. The math is not close.

The IRS gives you flexibility here on purpose. Use it.

FAQ

What happens to my 401(k) when I leave my job?

Nothing automatic, in most cases. Your balance stays where it is. If you have more than $7,000 in the account, your old employer can’t move it without your consent under SECURE 2.0 rules. Below $7,000 they can roll it into a default IRA, and below $1,000 they can cut you a check, which triggers a tax mess if you don’t redeposit within 60 days.

Should I roll my 401(k) into an IRA?

For most people, yes. An IRA gives you better fund choices, lower fees, and full control over the account. The main reasons not to: your new 401(k) is exceptional, you want 401(k) loan access, or you plan to do backdoor Roth contributions and need your pre-tax IRA balance at zero.

How long do I have to roll over a 401(k)?

If you do a direct rollover (trustee-to-trustee), there’s no deadline – take your time. If you do an indirect rollover where the old plan cuts you a check, you have 60 days from the date you receive the funds to deposit them into the new account, or the IRS treats it as a taxable cash-out.

Is it ever a good idea to cash out a 401(k)?

Almost never. If you’re under 59 1/2, you’ll pay a 10% penalty plus ordinary income tax on the full amount, and you lose decades of future compounding. The only times it makes sense are genuine emergencies with no other source of funds, and even then a 401(k) loan or hardship withdrawal is usually less destructive than a full cash-out.

Can I leave my 401(k) with an old employer forever?

If your balance is over $7,000, yes – the plan has to keep it. Practically, it’s not a great idea long term. You can’t add new contributions, you’ll lose track of it, and if the company is acquired or shuts down the plan, you’ll have to deal with the rollover anyway, often on a short timeline.

Where should I roll my old 401(k)?

If you want it managed for you, a robo advisor IRA is the cleanest option. Betterment and Wealthfront are the standard picks for hands-off investors. M1 Finance works if you want more control over the portfolio. Fidelity Go is the legacy-brokerage choice. All of them will handle the rollover paperwork for you, usually for free.