When you leave a job, your old 401(k) doesn't move automatically — you decide what happens to it. The IRS rules generally don't force you to act immediately, but if money ever lands in your hands (an indirect rollover or a cash-out check), the IRS starts a 60-day clock, and missing it can turn a routine move into a taxable event. Here are the four options people generally have and how many people weigh them. The right choice depends on your situation, and these rules and figures can change.
What are your four options?
1. Roll it over to an IRA. Many people move the balance into a Traditional IRA (for pre-tax money) or a Roth IRA (for Roth money). This generally gives the widest investment menu and often lower fees, and lets you consolidate old accounts. Trade-offs: IRAs generally don't allow loans, the Rule of 55 (penalty-free withdrawals after separating at 55+) generally applies only to 401(k)s, and rolling pre-tax money into a Traditional IRA can trigger the pro-rata rule that complicates future backdoor Roth contributions (see below).
2. Roll it over to your new employer's 401(k). If the new plan accepts rollovers, this consolidates everything in one place, generally keeps strong federal (ERISA) creditor protection, preserves the ability to take a loan later, and — importantly — keeps pre-tax dollars out of a Traditional IRA so a backdoor Roth stays clean. Downside: 401(k) menus are typically narrower than an IRA's.
3. Leave it with your old employer. You can generally keep the money in the old plan if your balance is at least $7,000. Under the SECURE 2.0 Act (effective 2024), plans can force out balances below that threshold: balances of $1,000 or less can be cashed out to you, and balances between $1,000 and $7,000 can be automatically rolled into an IRA the plan chooses. Leaving it is often fine short-term, though old accounts are easy to lose track of. Your plan's specific terms may differ.
4. Cash it out. You take the money as a distribution. For pre-tax balances the IRS generally treats this as ordinary income in the year you take it, plus a 10% early-withdrawal penalty if you're under 59½ (the Rule of 55 can waive the penalty if you separated in or after the year you turned 55). Many people find this the most expensive option — you lose the tax-advantaged growth and hand a large slice to taxes immediately.
How does the 60-day rollover window work?
If you do an indirect rollover — the plan sends the money to you — the IRS generally gives you 60 days from the date you receive it to deposit it into another qualified account. Miss the deadline and the IRS generally treats the whole amount as a taxable distribution (plus the 10% penalty if you're under 59½). The clock runs from the date you receive the funds, not the date of your last paycheck.
A direct rollover (trustee-to-trustee, where the money goes straight from the old plan to the new account and never touches your bank account) generally has no 60-day clock and no withholding. When it's available, many people choose the direct route.
Should you roll over directly or indirectly — and what is the withholding trap?
This is the gotcha that catches the most people:
- Direct rollover: funds move plan-to-plan or plan-to-IRA. The IRS generally treats this as having no tax withheld and nothing reportable as income.
- Indirect rollover: the check is made out to you. The plan is generally required to withhold 20% of any pre-tax amount for federal taxes. To roll over the full original balance within 60 days, you'd have to make up that withheld 20% out of your own pocket. If you only deposit the 80% you received, the IRS generally treats the missing 20% as a taxable distribution — taxed and (if you're under 59½) penalized.
There's also a one-rollover-per-12-months limit the IRS applies to indirect IRA-to-IRA rollovers. It generally does not apply to direct rollovers or to 401(k)-to-IRA rollovers — another reason many people keep it direct.
How are Roth and Traditional balances taxed in a rollover?
What you started with generally determines what's taxable:
- Pre-tax (Traditional) 401(k) → Traditional IRA: generally no tax. Money stays tax-deferred.
- Roth 401(k) → Roth IRA: generally no tax. Note the Roth IRA's own 5-year clock can affect when earnings come out tax-free.
- Pre-tax 401(k) → Roth IRA: the IRS generally treats this as a Roth conversion — fully taxable as income in the year you do it. Some people find it worth it in a low-income year (like one with a mid-year layoff), but it often helps to run the numbers first.
What happens to after-tax (mega-backdoor) contributions?
If your old plan allowed after-tax (non-Roth) contributions on top of the regular limit — the "mega-backdoor Roth" — leaving the job is, for many people, the chance to finally separate that sub-account, which is often stuck in-plan while you're employed:
- After-tax contributions can generally be rolled into a Roth IRA tax-free.
- The earnings on those contributions are pre-tax and generally go to a Traditional IRA (or you can convert them to Roth and pay tax on just the earnings).
One caution: rolling pre-tax 401(k) money into a Traditional IRA puts a pre-tax balance in your IRA, which generally triggers the pro-rata rule on any future backdoor Roth IRA contributions — meaning part of each backdoor conversion becomes taxable. People who use the backdoor Roth strategy often roll pre-tax money into their new employer's 401(k) instead of an IRA to keep it out of the pro-rata calculation.
What should you ask before moving anything?
- Does my new employer's 401(k) accept incoming rollovers?
- Is my balance above the $7,000 keep-it-here threshold?
- Can the plan do a direct trustee-to-trustee transfer (no check to me)?
- Do I have any after-tax contributions that should be split out to a Roth IRA?
- Do I currently use the backdoor Roth IRA? If so, would rolling pre-tax money into an IRA create a pro-rata problem?
When opening an IRA to receive a rollover, many people compare providers on fees and fund selection — the account is yours for decades, so the difference compounds. The IRS spells out the rules in Publication 590-A (Contributions to IRAs) and rollover treatment in Rollovers of Retirement Plan and IRA Distributions. Because these thresholds and figures can change, it often helps to confirm the current rules at the source for your situation.