What to Do With an Old 401(k) When You Change Jobs

Leaving a job leaves behind more than an email signature. Whatever sat in your workplace retirement account is still there, still invested, and now disconnected from any payroll contribution — an old 401(k) that millions of people simply forget about, sometimes for decades.

There's no deadline forcing an immediate choice, which is exactly why so many old accounts never get a decision at all. Here are the four actual options.

Option 1: Leave the old 401(k) where it is

Most plans allow a former employee to leave a balance above a minimum threshold (often around $5,000-$7,000) in place indefinitely. Nothing breaks, nothing is taxed, and the money keeps growing with the market.

The downside is accumulation without attention: two or three job changes later, you have three or four old 401(k)s, each with its own login, its own fund lineup, and its own fees — and a fragmented retirement picture that's hard to manage as one coherent portfolio.

Option 2: Roll it into your new employer's plan

If your new job offers a 401(k) that accepts incoming rollovers, this consolidates your old balance into the account you're actively contributing to. One login, one set of funds, one picture of where you stand.

Worth checking first: does the new plan's fund lineup have reasonably low fees? Rolling into a plan with expensive, actively managed funds as the only options can cost you more over decades than leaving the old account alone — see why fees matter this much.

Option 3: Roll it into an IRA

Opening an Individual Retirement Account and rolling the old 401(k) into it, done correctly as a direct rollover (the funds move institution-to-institution, never touching your hands), triggers no tax and no penalty.

This is usually the option with the most control: an IRA at a typical brokerage gives access to a far wider range of low-cost index funds than most employer plans offer. It's also the natural consolidation point if you expect to change jobs again — one IRA can absorb rollovers from every job you ever leave.

Option 4: Cash it out

Technically available, and almost always the wrong choice before retirement age.

Cashing out $20,000 from an old 401(k) in your thirties doesn't just cost the immediate tax and penalty — it erases every year of compounding that money would otherwise have had between now and retirement. The arithmetic of compounding is unforgiving about time horizons, and an early cash-out shortens the horizon by however many decades you have left to work.

The only scenario where this is defensible is a genuine emergency with no better alternative — and even then, it's worth checking whether a 401(k) loan (borrowing against your own balance, repaid through payroll, with no tax hit if repaid on schedule) is available first, since it avoids the permanent damage a cash-out causes.

How to actually do a rollover

1. Decide the destination — new employer's plan or an IRA — using the fee comparison above as the deciding factor.
2. Open the receiving account first, if it's a new IRA, before contacting the old plan.
3. Call the old plan's administrator and request a direct rollover to the new account. Most of the paperwork happens between the two institutions.
4. Confirm the funds land and get invested. A rollover sometimes arrives as cash sitting uninvested in the new account — that cash earns nothing until you actively choose funds and buy them.

The entire process typically takes one to three weeks and requires maybe thirty minutes of your own time, spread across a couple of phone calls.

What this is actually worth doing today

If you have one old 401(k) sitting from a job you left years ago, the likely cost of inaction isn't catastrophic — the money is still invested and still growing. But three or four scattered accounts, never consolidated, make it nearly impossible to know your real asset allocation or your real fees, and that fog has a cost of its own, even if it never shows up as a single bad decision.

Thirty minutes now, against decades of either clarity or clutter, is not a close call.