In this guide
What happens to your 401(k) when you leave a job: the four options
Start with the reassurance, because it is what most people want to hear: your former employer cannot take your 401(k), and no clock starts ticking on your last day. The vested balance stays invested, keeps growing tax-deferred, and remains yours. What changes is that you can no longer contribute to it, and that you now have a decision to make.
The IRS frames that decision in exactly four ways for anyone leaving a job with a defined-contribution plan (IRS — retirement topics, termination of employment). The differences that matter are not about convenience. They are about what each destination preserves.
| Leave in old plan | Roll to new employer's plan | Roll to an IRA | Cash out | |
|---|---|---|---|---|
| Taxes now | None | None (direct rollover) | None to a traditional IRA; full income tax if you roll straight to a Roth | Entire pre-tax amount is ordinary income this year |
| Penalty exposure | None until you withdraw | None | None | 10% additional tax under 59½ unless an exception applies |
| Rule of 55 preserved? | Yes — this is the plan it attaches to | No for the old money once it moves; the new plan covers only a future separation from that employer | No — destroyed permanently | N/A |
| NUA on employer stock preserved? | Yes | Generally no | No — destroyed permanently | Election possible, but only if executed correctly as a lump sum |
| Investment menu | The plan's shortlist; often cheap institutional share classes | The new plan's shortlist — check it before you move | Effectively unlimited | N/A |
| Creditor protection | Strongest — ERISA anti-alienation | Strongest — ERISA anti-alienation | Unlimited in bankruptcy for rollover money; outside bankruptcy it is state law and varies | None — it is just cash |
| Backdoor Roth impact | None — plan money is invisible to pro-rata | None | Severe — pre-tax IRA money makes future backdoor contributions largely taxable | None |
| Roth conversion control | Limited to what the plan permits | Limited to what the plan permits | Full — you set timing and size every year | N/A |
Illustrative comparison. Plan documents, state law and personal circumstances change the answer.
Read the middle rows before the top ones. Almost everyone compares fees and fund menus, which is the easiest comparison to make and rarely the most expensive one. The rows that quietly decide six-figure outcomes are the rule of 55, NUA, and the pro-rata line.
The five questions that decide it
Answer five questions honestly and most of the analysis collapses. Any "yes" in the first three should stop you from rolling to an IRA on autopilot.
- Might you retire — or be laid off — between 55 and 59½? The old plan is a penalty-free bridge; an IRA is not.
- Do you hold appreciated employer stock? Price the NUA election before anything moves.
- Do you make backdoor Roth contributions each year? Pre-tax money landing in an IRA can end that habit permanently.
- How good is the old plan, really? Pull the fee disclosure. A large plan with institutional share classes can beat anything sold retail; a small plan at 1.2% all-in cannot.
- Do you want to convert to Roth on a schedule you control? The strongest argument for an IRA — and the calculator prices it.
You are allowed to split the decision. Nothing requires one destination for the whole balance. A common, sensible outcome: keep enough in the old plan to bridge to 59½, roll the surplus to an IRA for the menu and conversion control, and roll Roth 401(k) money to a Roth IRA so it escapes lifetime RMDs. Ask the administrator for a split direct rollover in writing.
What leaves with you — and what doesn't
Two pots, two rules. Your own elective deferrals — pre-tax and Roth — are always 100% vested, along with every dollar of growth on them. No employer can claw them back, and the reason you left is irrelevant.
Employer money is different. Matching and profit-sharing contributions vest on the schedule in the plan document — commonly a three-year cliff (nothing, then everything) or six-year graded (20% a year from year two). Whatever is unvested on your separation date is forfeited back to the plan. This is the one part of the decision with a genuine deadline attached, and it runs on the plan's definition of a year of service, not your intuition. If you are within a few months of a vesting step, the arithmetic on delaying your resignation is often striking.
Two other balances travel with you and are easy to overlook: after-tax (non-Roth) contributions, which can be split off to a Roth IRA in the same transaction as the pre-tax money, and any rollover balance from an earlier employer. Get a statement broken out by money source before you initiate anything — the sources determine what your options actually are.
When the plan pushes you out
"How long can I leave it there?" has a two-part answer, and the dividing line is your vested balance.
Above the plan's involuntary cash-out threshold, indefinitely. The plan cannot move your money without instruction. It can nag you, and it will, but the balance can sit there for a decade. SECURE 2.0 §304 raised the maximum threshold a plan may use from $5,000 to $7,000 for distributions after December 31, 2023 — and it is permissive, not mandatory, so individual plans may still use $5,000, $1,000, or no force-out provision at all. Your summary plan description is the only place that answers it for your plan. (Note that some IRS participant pages still describe the older $5,000 figure; the statutory ceiling is now $7,000.)
Below it, the plan can act without your signature, in two tiers set by IRC §401(a)(31)(B):
- $1,000 or less — the administrator may pay it to you directly, "less, in most cases, 20% income tax withholding, without your consent" (IRS — rollovers of retirement plan and IRA distributions). You still have 60 days to roll the money over and undo the tax, but only if you notice the check.
- Above $1,000, up to the plan's threshold — the plan must automatically roll the balance into an IRA opened in your name at a provider of the sponsor's choosing. Not taxable, but frequently parked in a capital-preservation product that barely outruns its own fees.
The force-out has a hidden casualty. A balance auto-rolled to an IRA has just lost the rule of 55 — without your signature and usually without your attention. If you separated at 55 or later with a modest balance you were counting on reaching penalty-free, deal with it before the plan does. And update your address with the old plan: unclaimed small balances are the single largest source of lost retirement accounts.
Direct rollover vs. a check in your name
Whatever destination you pick, there is a right way and a wrong way to get the money there.
A direct rollover — the plan pays the receiving IRA or plan, and any check is made out to the new custodian for your benefit, never to you — is not taxable, has nothing withheld, and starts no clock. This is the only version you should use. Ask for it explicitly and confirm the payee before the check is cut.
The alternative is the indirect, 60-day rollover: the plan pays you, and you have 60 days to redeposit the full amount. The catch is withholding. Any taxable eligible rollover distribution paid to you from an employer plan is subject to mandatory 20% federal withholding, even if you intend to roll it over (IRS Topic no. 413). A $150,000 balance arrives as $120,000; to complete the rollover you must find the missing $30,000 elsewhere within 60 days or it becomes permanently taxable income, plus the 10% additional tax if you are under 59½. There are narrow self-certification waivers for a missed deadline, but they are a repair kit, not a plan.
The outstanding 401(k) loan
If you borrowed from the plan and leave with a balance outstanding, the loan does not simply follow you. Most plans accelerate it: repay within a short window — often 60 to 90 days — or the unpaid balance is offset against your account. The offset is treated as a distribution, so it is ordinary income, and carries the 10% additional tax if you are under 59½ and no exception applies. Nothing was actually paid to you; the tax bill arrives anyway. It also shrinks what is available to roll over.
The relief is real and widely missed. Where the offset happens because you severed from employment or the plan terminated, it is a qualified plan loan offset, and the IRS gives you far longer than 60 days to fix it: "if you have a qualified plan loan offset amount, you have until the due date (including extensions) for the tax year in which the offset occurs to complete an eligible rollover" (Topic no. 413; the rule came in with the Tax Cuts and Jobs Act for offsets after 2017). Leave in March 2026 and you have until October 2027 — with an extension — to put an equal amount of your own money into an IRA or new plan and erase the income. An offset for any other reason, such as a straightforward default while still employed, keeps the ordinary 60-day deadline.
When rolling to an IRA is the wrong move
The default advice — from most articles, and from every firm that gets paid when the assets arrive — is to roll the balance into an IRA. It is right often enough to be dangerous. Four situations where it is the expensive answer:
- You separated at 55 or later and may need the money before 59½. The rule of 55 lets you take distributions from the plan you just left without the 10% additional tax. It is a plan exception with no IRA equivalent, and the IRS lists it as unavailable for IRAs. Roll the balance out and the exception is gone permanently — there is no roll-back. If early retirement is anywhere in your thinking, take what you need, or start the installment stream, before any rollover paperwork is signed.
- You hold appreciated employer stock. Net unrealized appreciation lets you pay ordinary rates only on the shares' cost basis and long-term capital gains rates on the appreciation. The IRS is blunt: you generally cannot use the NUA rule once the stock is rolled into an IRA or another employer plan (IRS Topic no. 412). Inside an IRA, every dollar of that appreciation becomes ordinary income forever. We cover the mechanics and the break-even in the NUA section of the advanced strategies guide — read it before the shares move.
- You contribute to a backdoor Roth. The pro-rata rule aggregates every traditional, SEP and SIMPLE IRA you own and treats each conversion as a proportional blend of pre-tax and after-tax dollars. Money in a 401(k) is excluded from that calculation. Roll $700,000 of pre-tax money into an IRA and a previously clean backdoor Roth becomes almost entirely taxable, every year, not just this one. Rolling into the new employer's plan instead keeps the IRA side clean — and is the reason plan-to-plan rollovers exist for high earners.
- You are in a high-liability profession. Assets in an ERISA plan are protected by the anti-alienation requirement. IRAs are protected differently: rollover money keeps unlimited protection in bankruptcy, but outside bankruptcy — an ordinary judgment, a malpractice claim — protection is a matter of state law and varies widely. This is a legal question, not a tax question; confirm it with counsel in your state before dismantling a federally protected shelter.
A fifth, less dramatic case: the old plan is simply good. Large plans routinely access institutional share classes cheaper than anything sold at retail, and some offer a stable value fund with no IRA equivalent at all. Compare total cost honestly rather than assuming the IRA wins.
The mirror image of this decision — moving 401(k) money while you are still on the payroll, and the full list of protections a rollover surrenders — is covered in the in-service withdrawal guide. If you are still employed and reading this in advance, start there.
The cash-out math: what it costs to withdraw from a 401(k)
A large share of departing employees take the cash, and it is almost always the worst of the four options. The bill has three layers, and they stack:
- Ordinary income tax on the entire pre-tax amount, in the year you take it, on top of the wages you already earned. A mid-year departure means the withdrawal lands on a full year of salary.
- The 10% additional tax if you are under 59½ and no exception applies — including, per the IRS, separation from service in or after the year you turn 55.
- 20% mandatory federal withholding at the source, which is a down payment rather than a settlement. Land in the 32% bracket and the balance is due in April.
Add state tax and a $60,000 cash-out at 45 commonly nets between $33,000 and $39,000 — before counting the decades of compounding forgone. If you need cash while still employed, a hardship withdrawal is a narrower and differently-taxed tool; after you leave, a partial distribution lets you take only what you need and roll the rest. Which account to draw from, in which year, belongs to the retirement withdrawals and taxes guide.
Doing it in the right order
- Get a statement by money source — pre-tax, Roth, after-tax, employer, rollover — plus your vested percentage and any loan balance, before your last day while HR still returns your calls.
- Screen for the three destroyers: separation at 55+, employer stock, backdoor Roth contributions. Any hit means the plan-to-plan route, or leaving the money where it is.
- Resolve the loan — repay it, or diarise the offset deadline: your tax return due date, including extensions, for the year of the offset.
- Compare fees honestly. Old plan versus new plan versus IRA, using fee disclosures rather than impressions.
- Take any plan distribution you need first, while the money is still inside the plan that permits it penalty-free.
- Then move the surplus, by direct rollover only. Confirm the payee on the check, and split destinations if the balance mixes money types.
- Reinvest immediately, and update beneficiaries. Rollovers land in cash and do not carry beneficiary designations across — and that form beats your will.
The whole exercise takes an afternoon and is worth more than most people's investment decisions that year. If the answer is an IRA and the reason is conversion control, run the schedule in the calculator first — the point of relocating the money is what you do with it afterward, not the move itself.