Leaving Your Job? Think Twice Before Ticking This 401(k) Box That Could Wipe Out 32% of Your Savings

Leaving a job means paperwork, and one form in the pile decides what happens to your old 401(k). One option on it can cost workers under the age of 59½ almost a third of the account.

When someone leaves an employer, the plan administrator sends the distribution options for the old 401(k). One of them is a full lump-sum cash payout.

Cashing out a traditional 401(k) before that age triggers ordinary income tax on every dollar withdrawn, plus a 10% federal penalty for early withdrawal, according to the Internal Revenue Service.

On a $25,000 (£18,450) balance held by someone in the 22% federal tax bracket, those two charges come to roughly $8,000 (£5,900), about 32% of the account, before any state taxes.

What the Cash-Out Box Really Costs You

Morgan Stanley lists four paths after separation: leave the money in the old plan, roll it into a new employer's 401(k), move it into an individual retirement account, or cash out. Only the last carries the early-withdrawal penalty for the under-59½s. The other three keep the savings tax-deferred and trigger no tax at transfer.

A 401(k) stays locked until a qualifying event, such as leaving a job, reaching 59½, or a financial hardship. Cashing out also removes the money from the market, ending any further investment growth on it.

'Your ability to contribute stops the moment you leave the employer. And because of job switches, this rollover phenomenon, where balances are rolled into cash, means time out of the market,' Andy Reed, Vanguard's head of behavioural economics research, said in the firm's guidance for departing workers.

The Rollover Trap Hiding in the 20% Rule

The rollover route has a catch of its own. Under IRS rules, any eligible rollover payment sent straight to a departing employee faces a mandatory 20% federal withholding, even when the person intends to redeposit the money into an IRA inside the 60-day window.

To complete the rollover and defer all the tax, the worker must replace that withheld 20% from other savings and redeposit the whole original balance. Anything not made up becomes a taxable distribution, carrying the same penalty for the under-59½s.

The way to avoid the withholding is a direct rollover, where the old plan issues a cheque payable to the new custodian for the benefit of the account holder. That requires opening the receiving account before the form is filed.

Under the SECURE 2.0 Act, plans can also force out former staff who hold vested balances of up to $7,000 (£5,170) without consent, up from the previous $5,000 (£3,690) limit. Balances from $1,000 (£740) up to that limit, left with no instruction, are moved automatically into a Safe Harbor IRA, usually a money-market fund.

Who Cashes Out, and Why It Keeps Happening

The pattern is common. Vanguard's How America Saves 2025 report, drawn from nearly 5M plan participants, found that roughly one in three people who leave a job take the balance in cash. A University of British Columbia analysis of 162,360 workers recorded a higher rate, 41.4%, with 85% of them withdrawing the entire account.

Hourly staff cash out most often. Vanguard's research put their cash-out rate 10 to 15 percentage points above that of salaried workers on similar incomes. The gap tracks back to emergency funds. In a 2024 survey of about 2,300 plan participants, only 39% of hourly workers said they were confident they could cover a $2,000 (£1,480) expense, next to 71% of salaried employees.

Workers with $2,000 (£1,480) or more set aside were 43 percentage points less likely to cash out when leaving a job, Vanguard's research found.

'An emergency savings buffer can help households deal with volatility and preserve their 401(k) wealth for retirement,' said Aaron Goodman, a Vanguard economist who worked on the emergency-savings research.

The decision is usually made in the days just after separation. Opening the receiving account, confirming the new plan accepts rollovers, and setting aside even a small cash buffer beforehand are the steps that keep the cash-out box from costing 32% of the account.