Your four options at a glance
When you leave a job, voluntarily or not, your 401(k) does not disappear and your employer cannot take back your vested balance. What changes is that you stop contributing through that paycheck, and you now get to choose where the money lives. There are exactly four choices, and three of them preserve the tax shelter.
| Option | Taxes and penalty now | Keeps growing tax-deferred? | Best for |
|---|---|---|---|
| Leave it in the old plan | None | Yes | Balances over $7,000 in a good, low-cost plan; people who left a job at 55 or older |
| Roll to new employer plan | None if done as a direct rollover | Yes | Consolidating accounts; keeping a clean backdoor Roth path; strong creditor protection |
| Roll to an IRA | None if done as a direct rollover | Yes | Maximum investment choice and control; people without a new plan to roll into |
| Cash out | 20% withheld immediately, plus income tax and usually a 10% penalty at filing time | No | Almost no one; a last resort in a genuine emergency |
The rest of this guide walks through each option, then the rules that can decide for you: vesting, outstanding loans, and the force-out thresholds for small balances.
Option 1: leave it in the old plan
Doing nothing is a legitimate option, with one big caveat. If your vested balance is over $7,000, federal rules let you stay in your former employer's plan indefinitely. The money keeps growing tax-deferred, you keep the plan's investment menu, and you can still roll it somewhere else later. Below $7,000, the plan is allowed to force you out (see the force-out section below), so "do nothing" is not really available for small balances.
- Pros: zero paperwork now; access to institutional funds that can be cheaper than retail versions; unlimited federal creditor protection under ERISA; and if you left the job in or after the year you turned 55, you can withdraw from that plan without the 10% penalty (the "rule of 55"), which an IRA rollover would forfeit.
- Cons: no new contributions; you may be charged former-employee account fees; you must track an orphaned account through address changes and plan mergers (billions of dollars sit in forgotten 401(k)s); and some plans restrict partial withdrawals for former employees, forcing all-or-nothing distributions later.
Leaving it behind makes the most sense when the old plan is genuinely good: low expense ratios, no ex-employee fees, and funds you actually want. If the plan is mediocre, treat "leave it" as a temporary parking spot, not a decision.
Option 2: roll it into your new employer's plan
If your new job offers a 401(k) that accepts roll-ins (most do), you can move the old balance straight into it and keep everything in one account. The mechanics matter more than the destination: always request a direct rollover, where the old plan sends the money straight to the new plan, either electronically or as a check made out to the new trustee for your benefit. You never touch the money, nothing is withheld, and nothing is taxed.
The alternative, an indirect rollover, means the check is made out to you personally. The old plan must then withhold 20% for federal tax, and you have 60 days to deposit the full original amount into the new plan, which means fronting the withheld 20% out of your own pocket and waiting until you file your return to get it back. Miss the deadline and the whole distribution becomes taxable, plus the 10% penalty if you are under 59 1/2. There is no good reason to choose this on purpose.
Consolidating into the new plan has two quieter advantages over an IRA. First, money inside a 401(k) does not count in the pro-rata math that governs backdoor Roth conversions, so high earners keep that door open. Second, ERISA plans carry uniform, essentially unlimited protection from creditors. You also preserve the ability to use the rule of 55 at the new employer later. The tradeoff is that you are limited to the new plan's investment menu and its fees.
Option 3: roll it into an IRA
Rolling to an IRA (a direct rollover to a traditional IRA for pre-tax money) is the most flexible option: you choose the broker, and the investment menu expands from a couple dozen funds to essentially everything, often at rock-bottom cost. There is no tax on a properly executed direct rollover, no contribution limit on rollover amounts, and you control the account forever, independent of any employer. You can model how that balance compounds on its own in our traditional IRA calculator.
But the IRA route has honest tradeoffs that brokerage marketing rarely mentions:
- Creditor protection is weaker and less uniform. 401(k) assets have unlimited federal protection under ERISA. Rollover IRA assets are protected in bankruptcy, but protection from other lawsuits and creditors outside bankruptcy depends on your state's law, which ranges from full to minimal.
- It can close the backdoor Roth. The pro-rata rule counts all your pre-tax IRA money when you convert. A large pre-tax rollover IRA makes future backdoor Roth conversions mostly taxable. If you expect to use that strategy, rolling into your new 401(k) instead keeps the path clean; our Roth conversion calculator shows the tax cost either way.
- You lose the rule of 55. Penalty-free access at 55 to 59 1/2 only exists inside the employer plan you separated from.
- It is a prime target for high-fee sales pitches. An advisor who moves you from a 0.05% index fund into a 1%-plus managed IRA can quietly cost you six figures over a career. Compare expense ratios before you sign anything.
For most people with no backdoor-Roth plans and no creditor concerns, a low-cost IRA at a major brokerage is an excellent home for old 401(k) money. Just make it a deliberate choice, not a default you were sold.
Option 4: cash out (and what it really costs)
Cashing out means taking the balance as a check. It is the worst option in almost every case, and yet it is what a large share of job changers with small balances actually do. Three separate costs stack up. The plan must withhold 20% for federal income tax immediately. If you are under 59 1/2, a 10% early-withdrawal penalty applies at filing time. And the entire distribution is ordinary taxable income at your marginal rate, which for many workers is higher than the 20% that was withheld, so you owe more in April.
Here is the full math for a 30-year-old in the 22% federal bracket cashing out a $30,000 balance:
| Line | Amount |
|---|---|
| Vested balance distributed | $30,000 |
| Mandatory 20% federal withholding | -$6,000 |
| Check you receive on day one | $24,000 |
| Federal income tax actually due (22% bracket) | $6,600 |
| 10% early-withdrawal penalty | $3,000 |
| Additional amount owed at tax time (beyond the withholding) | $3,600 |
| Total tax and penalty | $9,600 |
| What you actually keep | $20,400 |
So the $24,000 check is an illusion: after the 22% bracket tax and the penalty settle up, only about $20,400 of the $30,000 survives, and state income tax would cut it further. Now the other side of the ledger: rolled over instead and left invested at a 7% average annual return, that same $30,000 grows to roughly $320,297 by age 65. The real price of this cash-out is about $299,897 of retirement money. Run the same comparison with your own balance in our 401(k) calculator.
If you genuinely need some of the money, remember the options are not all-or-nothing: most plans let you cash out part and roll the rest, and hardship rules or a new plan's loan feature may be cheaper than a full distribution.
Vesting: what you keep and what you forfeit
Not every dollar in your account statement is necessarily yours. The money splits into two buckets. Your own contributions (salary deferrals, both pre-tax and Roth) plus their earnings are always 100% vested from day one, no matter how briefly you worked there. Employer money (matching and profit-sharing contributions) can be on a vesting schedule, and the unvested portion is forfeited back to the plan when you leave.
- Cliff vesting: 0% vested until a set anniversary (federal law caps the cliff at 3 years), then 100% at once. Leave one day early and you forfeit the entire match.
- Graded vesting: ownership phases in, typically 20% per year from year 2 to year 6 (the legal maximum stretch). Leave after year 3 and you keep 40% of the employer money.
- Immediate vesting: increasingly common, and required for certain safe-harbor employer contributions. Everything is yours from the first deposit.
Check your vesting schedule in the plan's summary plan description or your online portal before you set a resignation date. If you are weeks away from a vesting milestone worth thousands, delaying your last day can be the highest-paid work you ever do. Note that "years of service" usually counts from hire date, not from when you joined the 401(k).
If you have an outstanding 401(k) loan
A 401(k) loan turns a routine job change into a deadline. Most plans require the loan to be repaid shortly after you leave; if it is not, the plan "offsets" your balance, subtracting the unpaid loan from your account and reporting it as a distribution. That offset amount becomes taxable income, plus the 10% penalty if you are under 59 1/2, exactly as if you had cashed out that slice.
The good news is that the deadline is far more generous than it used to be. Before the 2017 Tax Cuts and Jobs Act, you had only 60 days to come up with the money. Under current law, a qualified plan loan offset (one triggered by leaving your job or by the plan terminating) can be rolled over until your federal tax-filing deadline, including extensions, for the year of the offset. Leave a job in July 2026 with an unpaid loan, and you have until April 2027, or October 2027 with a filing extension, to deposit the offset amount into an IRA or new plan and erase the tax bill. The IRS finalized these rules in 2021, and filing the extension gets you the extra six months even if you never needed extra time for the return itself.
Two cautions. The money you deposit comes from your own pocket (the plan already used your account to settle the loan), so start setting it aside immediately. And this extended deadline only covers offsets caused by severance or plan termination; a loan that simply goes into default while you are still employed is a "deemed distribution" and cannot be rolled over at all.
Small balances: the force-out rules can decide for you
If you do nothing and your balance is small, your former employer does not have to keep you in the plan. Under the SECURE 2.0 Act, the involuntary "force-out" limit rose from $5,000 to $7,000 for distributions made after December 31, 2023, and what happens to your money depends on which band it falls in:
- Under $1,000: the plan can simply mail you a check, minus 20% withholding. Unless you redeposit it within 60 days, this is a taxable cash-out with the penalty on top, imposed by inertia.
- $1,000 to $7,000: the plan cannot just send cash. It must roll your money into a safe harbor IRA opened in your name. That preserves the tax shelter, but these default IRAs typically park the money in low-yield cash-like investments while charging maintenance fees, so a small balance can actually shrink over the years.
- Over $7,000: you cannot be forced out. The money stays in the plan until you decide.
SECURE 2.0 also blessed auto-portability: a network run by Retirement Clearinghouse with the largest recordkeepers (the Portability Services Network, including Fidelity, Vanguard, Empower, Alight, and others) that automatically finds your safe-harbor IRA when you enroll in a new employer's plan and moves the money into it, unless you opt out. It is live and expanding, but coverage is not yet universal, so do not count on it. The reliable move is simple: when you leave, take the 30 to 60 days the plan gives you and choose a rollover destination yourself.
The 60-day rule, the once-per-year rule, and Roth money
Three technical rules cause most rollover accidents, and all three are easy to sidestep once you know them.
- The 60-day rule. Any distribution paid to you personally must land in an eligible retirement account within 60 days or it becomes permanently taxable (plus the penalty if you are under 59 1/2). The IRS grants relief only in narrow hardship cases. Direct rollovers are never subject to this clock, which is reason enough to always use them.
- The once-per-year IRA rollover limit. You may do only one indirect (60-day) IRA-to-IRA rollover in any 12-month period, across all your IRAs combined. A second one is treated as a taxable distribution plus an excess contribution. Crucially, this limit does not apply to direct trustee-to-trustee transfers, to rollovers from a 401(k) into an IRA, or to Roth conversions, so people who stick to direct movements never encounter it.
- Roth 401(k) money stays Roth. Designated Roth balances can only move to another Roth 401(k) or to a Roth IRA, tax-free either way. Rolling to a Roth IRA is usually the better endgame: Roth IRAs have no lifetime required minimum distributions and friendlier withdrawal ordering. One nuance: the Roth IRA's own 5-year clock governs qualified withdrawals after the rollover, so if you have never owned a Roth IRA, opening one early (even with $100) starts that clock now.
If your old plan holds both pre-tax and Roth money, a single direct rollover can split them correctly: pre-tax dollars to a traditional IRA or new plan, Roth dollars to a Roth IRA. The plan's distribution form handles it; you just have to give both account numbers.