A woman I know — sharp, hardworking, thirty years in healthcare — left her job last spring. New opportunity, better pay, long overdue. In the scramble of switching over her benefits, updating her direct deposit, and figuring out the new commute, she did something that quietly cost her tens of thousands of dollars. She cashed out her old 401(k).

She didn’t think of it as a mistake. She thought of it as tidying up.

It’s one of the most common moves people make when they change jobs, and it’s almost always the wrong one. Here’s what actually happens when you cash out that account — and what you should do instead.

The Real Cost of Cashing Out

If you’re under 59½ and you cash out a 401(k), the IRS takes a 10% early withdrawal penalty off the top. Then you owe income taxes on whatever’s left, because that money was never taxed going in. Depending on your balance and your tax bracket, you could walk away with sixty or seventy cents on the dollar. Sometimes less.

That’s painful enough on its own. But the part that really stings is what happens to the money you don’t lose to penalties — because you’ve now pulled it out of a tax-advantaged account where it was growing.

Run the numbers on a $10,000 balance cashed out at age 50. After the penalty and taxes, maybe you pocket $7,000. Meanwhile, that $10,000 left invested at a 7% annual return — which is actually a bit conservative compared to the stock market’s long-run average — would have grown to nearly $27,600 by age 65. You didn’t just lose the penalty. You lost fifteen years of compounding.

Washington calls the early withdrawal penalty a “deterrent.” Your calculator calls it a gut punch.

What You Should Do Instead

When you leave a job, you’ve generally got a few options for your old 401(k). You can leave it where it is, roll it into your new employer’s plan, or roll it into an IRA you control.

Leaving it with your old employer sounds easy, but it’s not ideal. Once you’re off the payroll, you’re not exactly a priority. Plan updates, rule changes, important notices — there’s no guarantee those find their way to you the way they should. Out of sight, out of mind, and eventually out of touch with an account that’s supposed to fund your retirement.

The cleaner move is a rollover — either into your new employer’s 401(k) if one’s available, or into an IRA you open yourself. Either way, the money stays invested, keeps growing, and stays under your watch.

One thing matters here: go direct. A direct rollover means the money moves straight from your old plan to your new one. You never touch it. That’s exactly what you want.

If you take an indirect rollover instead — meaning the check comes to you first — you’ve got 60 days to get that money into a new retirement account. Miss the deadline, and the IRS treats it as a distribution. Same penalties, same taxes, same outcome as if you’d just cashed out. The clock doesn’t care that you meant to do it right.

What This Means for Your Retirement

Job changes are one of the most financially vulnerable moments in a working person’s life. There’s a lot happening at once, and retirement savings often feel like a lower priority than getting the new health insurance sorted out.

But the decisions you make in those first few weeks after leaving a job can follow you for decades. A 401(k) you cash out at 45 doesn’t just cost you the penalty. It costs you everything that money would have become by the time you’re ready to stop working.

Before you do anything with an old retirement account, slow down. Call the plan administrator. Ask specifically about a direct rollover. If you’re unsure where the money should land, a fee-only financial advisor can walk you through the options without trying to sell you something.

Tidying up is fine. Just don’t tidy your retirement savings right out of existence.