Job Change and 401(k) Rollover

When you leave a job, your 401(k) does not leave with you. You have four choices—each with different tax, fee, and flexibility implications. Understanding the choices prevents a costly mistake.

Key takeaways

• The four options: roll to an IRA (most common, offers flexibility and lower fees); leave with old employer (simple, limits growth and fees); roll to new employer's 401(k) (possible if plan allows, maintains 401(k) structure); or cash out (triggers immediate tax and penalties, almost never the best choice).
• A trustee-to-trustee rollover (money goes directly from old plan to new account without passing through your hands) avoids income tax and the 60-day deadline.
• Beware of the pro-rata rule: if you have multiple IRAs or 401(k)s, rolling a post-tax contribution portion can trigger a huge tax bill.
• Leaving a small balance with an old employer can accumulate fees and be forgotten; rolling or cashing out within a few months is usually better.
• Your old employer's 401(k) may have lower fees, better investments, or special features (e.g., the "Net Unrealized Appreciation" rule for concentrated stock); evaluate before deciding to roll out.

The four options at a glance

When you leave a job where you have a 401(k), you have four paths:

1. Roll to an IRA (Roth or traditional)
2. Leave the balance with your old employer's plan
3. Roll to your new employer's 401(k) (if the new plan allows)
4. Cash out (take a distribution)

Most people choose option 1 or 2. Option 4 is rarely optimal. Option 3 is less common but sometimes advantageous. Let's walk through each.

Option 1: Roll to an IRA

A rollover to an IRA is the most common choice. You take your 401(k) balance and transfer it into a traditional IRA (if it was a pre-tax 401(k)) or a Roth IRA (if it was a Roth 401(k)). The key is using a trustee-to-trustee transfer: the money goes directly from your old employer's plan to your IRA custodian, never touching your hands.

Tax treatment: If done correctly (trustee-to-trustee transfer), the rollover is not a taxable event. The money grows tax-deferred in the IRA, just as it did in the 401(k).

Why roll to an IRA?

• Lower fees: IRAs typically have lower fees than 401(k)s. A 401(k) plan may charge 0.5% to 1.5% in annual fees; an IRA at Vanguard or Fidelity might charge 0.03% to 0.1%.
• More investment choices: A 401(k) is limited to the handful of funds the employer selects. An IRA can hold thousands of funds, stocks, bonds, or ETFs.
• More flexibility: An IRA allows you to do a Roth conversion (moving pre-tax money to a Roth), take a loan in some cases, or use it for special purposes like the "super-saver" rule for self-employed people.

Why not roll to an IRA?

• Loss of 401(k) protections: A 401(k) has ERISA protections that make it harder for creditors to access. An IRA has less protection in some states.
• Age 55 rule: If you leave a job at age 55 or older, you can withdraw from your 401(k) without the 10% early withdrawal penalty (if the plan allows). An IRA does not have this exception; you must wait until 59½ or use a special rule (substantially equal periodic payments). This is critical if you plan to retire early.

Option 2: Leave with old employer

Many 401(k) plans allow you to leave your balance with the employer even after you leave the job. This is simple: you do nothing, and the money stays in your old plan.

Why leave it?

• Simplicity: No paperwork, no decision-making.
• Age 55 rule: If you are 55 or older, you can withdraw without penalty, which you cannot do from an IRA.
• Sometimes lower fees or better investments: A large employer's 401(k) sometimes has institutional-level fees that are cheaper than retail IRAs.

Why not leave it?

• Forgotten accounts: Many people leave money with an old employer and forget about it. Years later, they find the account was terminated or they owe taxes on dividends they did not realize.
• Limited investment options: You are stuck with the plan's fund menu.
• Fees: Many plans charge higher fees once you are no longer an employee.
• Lack of oversight: You are less likely to monitor an account you are not actively using.

Most people who leave it end up regretting it within five years and then rolling it anyway. Better to make a decision upfront.

Option 3: Roll to new employer's 401(k)

Some employers allow incoming employees to roll a previous 401(k) into their new 401(k) plan. This is straightforward: you request a trustee-to-trustee transfer to the new plan.

Why do this?

• Consolidation: All your 401(k) money in one place, easier to manage.
• Potential lower fees: Some large-employer 401(k) plans have institutional fees that are very competitive.
• Clarity for estate planning: Simpler for your beneficiaries.

Why not do this?

• Limited investment options: You are restricted to the new employer's fund menu.
• Complexity: Some plans do not allow rollins, or have restrictions.
• Loss of IRA flexibility: Roth conversions and other IRA features are not available in a 401(k).

This is less common than rolling to an IRA, but if the new plan is excellent and you plan to stay at the employer for many years, it can make sense.

Option 4: Cash out (almost never correct)

If you withdraw the money as a taxable distribution, you owe income tax on the full amount, plus a 10% early withdrawal penalty if you are under 59½. On a $100,000 balance, this might mean $30,000 to $40,000 in taxes and penalties, leaving you with $60,000 to $70,000.

The only scenario where cashing out makes sense is if you have a very small balance (under $5,000) and you desperately need the money. Even then, a loan from the new plan or a short-term personal loan is usually better.

Do not cash out.

The pro-rata rule trap

Here is a dangerous situation many people encounter: you have a traditional IRA with $50,000 in pre-tax contributions and earnings, and your old 401(k) has $100,000. You request a rollover of the $100,000 to a new IRA.

But wait. The IRS treats all your IRAs as one big pool for tax purposes. If you then do a Roth conversion (moving some pre-tax money to a Roth), the IRS says you cannot convert just the new money. Instead, you must convert pro-rata: if 80% of your total IRA balance is pre-tax, then 80% of the conversion is taxable.

Here is the damage: You convert $50,000, thinking you will owe tax on $0 (because it is new money you rolled in). Instead, you owe tax on $40,000 (80% of $50,000), because the pro-rata rule applies.

To avoid this, if you plan to do a Roth conversion, do it before rolling a large 401(k) into an IRA. Or roll the 401(k) into the new employer's plan instead of an IRA (this blocks the pro-rata rule). Or consolidate any existing IRAs into a rollover IRA first, to understand your basis.

This is a complex situation. If you plan a Roth conversion, consult a tax advisor first.

The Net Unrealized Appreciation rule

Here is a lesser-known advantage of keeping a 401(k) until you leave the job: the Net Unrealized Appreciation (NUA) rule.

If your 401(k) holds company stock (say, you own 100 shares of your employer's stock that were worth $50,000 when you left, and you bought them at $10,000), you can use NUA. Instead of rolling the stock into an IRA, you request a distribution of the stock to a taxable brokerage account. You pay income tax on the $10,000 cost basis, but the $40,000 appreciation is not taxed. Later, when you sell the stock, the $40,000 gain is taxed as a long-term capital gain (15% or 20% tax rate), which is lower than ordinary income rates (up to 37%).

This only works if your 401(k) holds company stock and you leave the job. It is powerful tax planning if the conditions are right, but you have to know it exists and elect it correctly. Consult a tax advisor if this applies.

The process: how to roll over

1. Notify your old plan administrator that you want to do a rollover. They will send you a check or transfer the funds.
2. Request a trustee-to-trustee transfer. This is critical. Do not take a check made out to you. The check should go to your IRA custodian's address, or the custodian should execute an ACH transfer directly.
3. Choose your IRA custodian (Vanguard, Fidelity, Schwab, etc.) and fund type (traditional or Roth, matching what you rolled out from).
4. Keep documentation of the transfer: the amount, the date, and the fact that it was a rollover.
5. Notify your accountant so they can document the rollover on your tax return if needed (it should not be taxable, but you want to report it correctly).

If you receive a check, do not deposit it into your personal checking account. You have 60 calendar days to deposit it into an IRA or new 401(k), or it becomes a taxable distribution. Set a calendar reminder.

Job change flowchart

Next

A job change is stressful, but moving to a new job at least brings the promise of continued income. But what if the job is not a move—what if it is a loss? The next article addresses financial life when employment ends, either temporary or permanent, and how to adjust your portfolio during job loss.

Related concepts

• Job Loss and Emergency Mode