Your employer is the gateway to most 401(k) plans

A 401(k) exists because your employer set one up. Unlike an IRA, which you open on your own at a bank or brokerage, a 401(k) is a workplace retirement plan that only your employer can offer. If your company does not sponsor a 401(k), you cannot have one through that job — you would need to open an IRA instead or wait until you work somewhere that does offer a plan.

Your employer chooses the plan provider (often Fidelity, Vanguard, or Schwab), decides which investments you can pick from, and sets the rules for when you can withdraw money. They also handle the paperwork with the IRS. This means your options depend entirely on where you work.

When you start a new job, your HR or benefits department will tell you whether a 401(k) is available, when you become may be able to access to join, and how to enroll. Many employers require you to work there for a set period — often 30 days or 90 days — before you can start contributing.

Key Takeaways

  • Your employer must sponsor a 401(k) for you to have one; you cannot open one on your own.
  • Employer matching contributions are information programs, but you only receive them if you contribute enough to trigger the match.
  • When you leave a job, you must decide what to do with your 401(k) balance within a set timeframe, usually 60 days.
  • Your vesting schedule determines how much of your employer's contributions you actually own; you always own 100 percent of your own contributions when ready.
  • If your employer goes out of business, your 401(k) is protected by federal law and remains yours.

How employer matching works and why it matters

Many employers offer to match a portion of what you contribute. A common match is 50 percent of the first 6 percent you contribute — meaning if you put in 6 percent of your salary, your employer adds 3 percent. This is money you do not earn through work; it is a direct deposit into your 401(k) account.

The catch is that you have to contribute first. If you contribute nothing, you receive no match. If you contribute only 2 percent when the match requires 6 percent to get the full benefit, you only receive a match on that 2 percent. Your employer sets the exact formula, so check your plan documents or ask your benefits team what your company offers.

Matching contributions are one of the biggest reasons to use your 401(k) if one is available. Even if you think you cannot afford to save, contributing enough to capture the full match is usually worth it — it is an when ready return on your money that you cannot get anywhere else.

Vesting: when employer contributions become yours

Your own contributions to a 401(k) are always yours when ready. But employer contributions — whether matching funds or profit-sharing contributions — may come with strings attached. Vesting is the schedule that determines when you actually own the employer's money.

A common vesting schedule is "cliff vesting" at three years, meaning you own zero percent of employer contributions until you have worked there for three years, then you own 100 percent. Another common schedule is "graded vesting," where you own an increasing percentage each year — for example, 20 percent after year one, 40 percent after year two, and so on until you reach 100 percent after five years.

If you leave before you are fully vested, you forfeit the unvested portion. If you leave after three years under a three-year cliff schedule, you take 100 percent of the employer match with you. If you leave after two years, you take zero. This is why the vesting schedule matters when you are deciding whether to stay at a job or move on.

What happens to your 401(k) when you change jobs

When you leave your job, your 401(k) balance stays in that employer's plan unless you move it. You have several options, and the timeframe matters. Most plans give you 60 days to decide what to do before they force a decision on you.

You can roll over your balance to an IRA at a bank or brokerage, which gives you more investment choices and often lower fees. You can roll it into your new employer's 401(k) if that plan accepts rollovers. You can leave it in your old employer's plan if the balance is large enough (usually at least $5,000). Or, if you need the money, you can take a distribution, though this triggers taxes and possibly a 10 percent penalty if you are under 59½.

A direct rollover — where the money moves straight from one plan to another without passing through your hands — is the safest route because it avoids tax withholding and the risk of missing the 60-day important date. If the money lands in your personal bank account first, your old plan will withhold taxes, and you have only 60 days to deposit the full amount (including the withheld taxes) into a new plan or you will owe taxes and penalties on the difference.

How your salary and job changes affect contribution limits

The IRS sets an annual limit on how much you can contribute to a 401(k). For 2024, that limit is $23,500 (or $31,000 if you are 50 or older). This limit applies across all 401(k)s you have — if you work two jobs and both offer 401(k)s, your combined contributions cannot exceed the limit.

Your contributions come out of your paycheck before taxes, which lowers your taxable income for the year. If you earn $60,000 and contribute $6,000 to your 401(k), you report only $54,000 as taxable income. This is one of the main tax benefits of a 401(k).

If you change jobs mid-year, keep track of how much you have already contributed. If you contributed $12,000 at your first job and then move to a second job, you can only contribute $11,500 more in 2024 (assuming the $23,500 limit). Your new employer's payroll system will not know what you contributed elsewhere, so you need to tell them or you risk over-contributing and facing penalties.

Protection if your employer closes or files bankruptcy

Your 401(k) is legally separate from your employer's business. If your company goes out of business, gets acquired, or files bankruptcy, your 401(k) money is protected. It does not become part of the company's assets that creditors can claim.

The plan itself may be terminated, which means no new contributions go in, but your balance remains yours. The plan administrator will contact you with instructions on what happens next — usually you will be given a important date to roll the money into an IRA or another plan, or it will be rolled over automatically on your behalf.

The one exception is if your employer fails to deposit the money you authorized them to take from your paycheck. In that case, the money was never actually in your 401(k); it was held by the employer. This is rare but has happened. Check your 401(k) statements regularly to confirm that your contributions are being deposited.

Self-employment and 401(k)s

If you are self-employed or own a small business, you cannot have a traditional 401(k) unless you have employees. Instead, you can open a Solo 401(k) (also called an individual 401(k)), which works similarly but is designed for one person or a married couple with no employees.

A Solo 401(k) lets you contribute as both the employee and the employer, which means you can set aside more money than you could in an IRA. You set up the plan yourself through a bank or brokerage, and you handle all the paperwork. If you later hire employees, you may need to convert to a regular 401(k) or choose a different plan type.

Frequently Asked Questions

Can I have a 401(k) if I work part-time?

That depends on your employer's plan rules. Some employers include part-time workers; others do not. Ask your HR department whether part-time employees are covered. If your employer does not offer a 401(k) or excludes part-time workers, you can open an IRA on your own.

What if I get a raise — can I contribute more to my 401(k)?

Yes. You can change your contribution amount at any time during the year, usually through your employer's benefits portal or by contacting HR. Many people increase contributions when they get a raise so they do not feel the difference in their take-home pay.

Do I lose my employer match if I leave mid-year?

You lose only the unvested portion. If your employer matches 50 percent of the first 6 percent you contribute and you are fully vested, you keep the match even if you leave after one month. If you are not yet vested, you forfeit the unvested portion of the match but keep your own contributions.

Can my employer take money out of my 401(k) if I owe them money?

No. Your 401(k) is protected from creditors, including your employer. Your employer cannot garnish your 401(k) to recover a debt. The only exception is a court order in a divorce or a levy from the IRS for unpaid taxes.

What if I get laid off — what happens to my 401(k)?

Your 401(k) is yours to keep. You have the same options as if you quit: roll it to an IRA, roll it to a new employer's plan, leave it where it is, or take a distribution. Being laid off does not change your ownership of the money.