What to Do With Your 401k When You Change Jobs

Changing jobs triggers one of the most commonly mishandled decisions in personal finance. You have a 401k balance at your old employer. You have a few options for what to do with it. One of those options is genuinely terrible and chosen by a surprising number of people anyway. The others are mostly fine, with some real differences worth understanding. For the broader impact a job change has on your retirement trajectory — salary reset, contribution gap, new match structure — see the guide on how to model a job change in your retirement plan.

The decision does not need to be complicated. Here is how to think through it cleanly.

Your Four Options

When you leave an employer with a 401k balance, you generally have four choices: leave it in the old plan, roll it to an IRA, roll it to your new employer's plan, or cash it out. The fourth option is almost always wrong. The first three are situationally reasonable.

Option 1: Leave It in the Old Plan

Most 401k plans allow former employees to leave their balance in the plan indefinitely, though some plans force distributions if the balance is below a certain threshold — typically $5,000 or $7,000. If your balance is above that threshold and you are not being forced out, leaving the money in the old plan is a legitimate choice that requires zero action.

The case for leaving it is simple: inertia. The money stays invested, continues compounding, and you do not have to do anything. For people in the middle of a job transition with a lot of other things to manage, this is often the right default.

The case against it is plan quality and consolidation. If your old plan has high-fee fund options, leaving the money there means paying those fees indefinitely. If you have multiple old 401ks at former employers, tracking several separate accounts becomes administratively annoying over time. And if you retire from your most recent employer at 55 and want to use the Rule of 55, having money in an old employer's plan rather than the most recent one disqualifies that balance from the penalty-free withdrawal provision.

Option 2: Roll It to an IRA

Rolling the old 401k to a traditional IRA at a brokerage — Fidelity, Vanguard, Schwab — is the most commonly recommended move and is right for most people. It consolidates the money into an account you fully control, gives you access to the full range of low-cost index funds rather than whatever your old plan offered, and has no tax consequences if done correctly as a direct rollover.

A direct rollover means the money goes from the old 401k plan directly to the IRA without passing through your hands. No taxes withheld, no 60-day rollover clock, no risk of accidental distribution. This is the clean path. An indirect rollover — where the check is made out to you and you deposit it yourself within 60 days — works but is riskier and adds unnecessary complexity.

The main consideration against the IRA rollover is the Rule of 55 issue mentioned above, and the pro-rata rule for backdoor Roth conversions. If you have significant pre-tax IRA balances and are doing or planning to do backdoor Roth IRA contributions, rolling more money into a traditional IRA increases the pro-rata calculation and the tax on conversions. In that case, rolling to a new employer's plan instead keeps the pre-tax money in the 401k ecosystem and preserves cleaner backdoor Roth access. The full Roth vs traditional decision framework is in Roth vs traditional IRA and 401k.

Option 3: Roll It to Your New Employer's Plan

If your new employer's 401k plan accepts incoming rollovers — not all do — rolling the old balance into the new plan consolidates everything in one place and keeps the pre-tax money in the 401k ecosystem rather than in an IRA.

The case for this option is strongest when the new plan has good investment options and you are doing or planning backdoor Roth IRA conversions. It is also cleaner for people who want a single account to think about rather than a 401k plus a separate IRA rollover account.

The case against is plan quality. Some employer plans have limited fund menus or higher expense ratios than what is available in an IRA. If the new plan's funds are materially worse than what you could hold in an IRA, consolidating there just to avoid the IRA rollover is a tradeoff that costs you in fees over time.

Option 4: Cash It Out — Almost Always Wrong

Cashing out a 401k when you leave a job triggers ordinary income tax on the entire balance plus a 10% early withdrawal penalty if you are under 59½. On a $30,000 401k balance for someone in the 22% bracket, the math looks like this: $6,000 in penalty plus $6,600 in income tax, leaving roughly $17,400 in hand from a $30,000 balance. That is a 42% haircut.

More importantly, $30,000 left invested at 30 and growing at 7% for 35 years is worth approximately $320,000 at 65. Cashing it out produces $17,400 today and sacrifices $320,000 in retirement. That is the actual cost of the cash-out decision, not the $12,600 in immediate taxes and penalties.

The only reasonable arguments for cashing out are genuine financial emergency — you have no other option and the alternative is worse debt — and very small balances where the administrative burden of a rollover exceeds the account's future value. For any balance above a few thousand dollars in a working career, the cash-out is almost never the right call.

The Vesting Check Before You Leave

Before doing anything with a 401k when changing jobs, check the vesting schedule. Your own contributions vest immediately — they are always yours. But employer match contributions vest on a schedule that varies by plan, typically over two to six years.

If you are 80% vested in the employer match and leaving three months before full vesting, you forfeit 20% of the accumulated match balance. On a large match balance, that can be thousands of dollars. Knowing your vesting status before accepting a new offer — and factoring unvested match into the compensation comparison — is worth the five minutes it takes to check.

The Decision Tree

If you are under 59½ and plan to retire at or after 55 from your most recent employer: leave the 401k at that employer in place when you retire. Do not roll it to an IRA if you plan to use the Rule of 55.

If you are doing backdoor Roth IRA conversions or plan to: roll old 401ks to the new employer's plan if the plan accepts rollovers and has reasonable fund options. Avoid accumulating pre-tax IRA balances that complicate the pro-rata calculation.

For most other people: roll to an IRA at a low-cost brokerage. Full fund selection, low fees, full control, no ongoing relationship with a former employer's plan administrator.

In all cases: do not cash out. The tax cost is immediate and large. The opportunity cost compounds for decades.

How a Job Change Affects Your Retirement Projection

A job change often involves a salary change, a different employer match structure, and potentially a gap in contributions during the transition period. Each of these affects your retirement projection — sometimes in opposite directions simultaneously.

At NumberToRetire.com, you can model a job change by using the year-by-year salary override to set your salary to the new amount at the year you change jobs, and adjusting the employer match percentage to reflect the new plan. If there is a contribution gap during the transition, override contributions to zero for those months. The projection updates to show the downstream impact of each change on your retirement balance, so you can see the net effect of the job change on your retirement timeline rather than estimating it.