The core difference: who manages the money and when you get it

A pension is a monthly payment your employer promises to give you for life after you retire, based on how long you worked there and what you earned. Your employer puts money into a fund, a professional manager invests it, and the company guarantees the amount you receive each month — no matter how long you live or how the investments perform.

A 401(k) is a savings account you control. You put in your own money (usually taken from your paycheck before taxes), your employer may add matching funds, and you choose how to invest it. When you retire, whatever is in the account is yours to withdraw. If the investments lose money, your balance shrinks. If you live a long time, you have to make the money last.

The practical difference: with a pension, your employer carries the risk. With a 401(k), you do.

Key Takeaways

  • A pension pays you a set amount every month for life; a 401(k) is a lump sum you manage yourself after you leave your job.
  • With a pension, your employer invests the money and guarantees your payment; with a 401(k), you choose the investments and keep what grows.
  • Pensions are rare in private companies now but common in government and union jobs; 401(k)s are the standard retirement account for most workers.
  • You cannot usually take a pension early without a permanent reduction in your monthly payment; 401(k) withdrawals before age 59½ usually trigger taxes and penalties.
  • If you change jobs, you keep your 401(k) balance; a pension stays tied to the employer who promised it, though you may be able to transfer it.

How contributions work: who puts money in

With a pension, you typically contribute a small percentage of your salary — often 3 to 8 percent — and your employer contributes the rest. Some pensions require no employee contribution at all. The employer is responsible for making sure there is enough money in the fund to pay all retirees. If the fund runs short, the employer must add more.

With a 401(k), you decide how much to contribute from your paycheck, up to a legal limit (in 2024, that limit is $23,500 per year for people under 50). Your employer may match a portion of what you put in — commonly 3 to 6 percent of your salary — but they have no obligation to do so. You are responsible for building your own balance.

Investment control and risk

A pension fund is managed by professional investors hired by your employer. You do not choose where the money goes. The fund typically holds a mix of stocks, bonds, and other investments designed to grow steadily over decades. Your monthly payment is may provide by the employer, regardless of whether the fund performs well or poorly. If the fund loses money, the employer absorbs the loss.

With a 401(k), you pick from a menu of investment options — usually mutual funds, target-date funds, or individual stocks — offered by your plan. You can move money between options as often as you want. If your investments gain value, your balance grows. If they lose value, your balance shrinks. You bear all the investment risk.

What you receive in retirement

A pension typically pays you a fixed monthly amount for the rest of your life. The amount is calculated using a formula that factors in your years of service and your salary history. For example, a common formula is 1.5 percent of your average salary times your years of service. If you worked 30 years and your average salary was $50,000, you might receive $22,500 per year ($1,875 per month) for life.

Some pensions offer a lump-sum option — a one-time payment of the total value of your future payments. If you take this option, you receive the money all at once and the pension ends. This is a major decision because if you spend it quickly or invest it poorly, you have no monthly income later.

With a 401(k), you own whatever balance has accumulated. You can withdraw it all at once, take monthly withdrawals, or leave it invested and withdraw as needed. There is no may provide amount. If you have $500,000 saved and live 30 years in retirement, you need to make that money last. Many people use a strategy called the "4 percent rule" — withdrawing 4 percent of the balance each year — but this is a guideline, not a may provide.

Portability: what happens when you change jobs

If you leave a job with a pension, your options depend on whether you are vested — meaning you have worked there long enough to own the pension benefit. Vesting periods vary but are often 5 to 10 years. If you are vested, you can usually leave the money in the pension and collect your monthly payment starting at retirement age. If you are not vested, you typically lose the benefit entirely. Some pensions allow you to transfer the value to an Individual Retirement Account (IRA), but this is less common.

A 401(k) is portable. When you leave your job, you own the full balance immediately (assuming you are vested in any employer match, which usually happens faster than a pension — often after 3 to 5 years). You can roll the money into a new employer's 401(k), move it to an IRA, or leave it where it is. You keep control of the money and the investments.

Early withdrawal rules and penalties

If you need money before retirement, a pension is largely off-limits. Most pensions do not allow withdrawals before your official retirement age. If you do take money early, your monthly payment is reduced permanently — often by 5 to 10 percent for each year you retire before your full retirement age. Some pensions allow loans, but this is uncommon.

A 401(k) allows withdrawals at any time, but there are costs. If you withdraw before age 59½, you owe income tax on the money plus a 10 percent penalty (with some exceptions for hardship, disability, or medical expenses). After age 59½, you can withdraw without penalty but still owe income tax. Starting at age 73, you must take a minimum withdrawal each year, whether you need the money or not.

Why pensions have become rare

Pensions were once the standard retirement benefit for most workers. Employers liked them because they could predict costs and take a tax deduction for contributions. Workers liked them because the payment was may provide and they did not have to manage investments.

Over the past 30 years, most private employers have switched to 401(k)s. The shift happened because 401(k)s are cheaper for employers — they contribute less, and workers bear the investment risk. Pensions are still common in government jobs (federal, state, and local), union positions, and some large corporations, but they are rare in small and mid-size private companies.

Frequently Asked Questions

Can I have both a pension and a 401(k)?

Yes. Many government and union workers have a pension from their main job and also contribute to a 401(k) or similar plan. Some employers offer both, though this is uncommon in the private sector. If you do have both, they are separate accounts with separate rules.

What happens to my pension if the company goes out of business?

If your employer is a private company, the Pension Benefit Guaranty Corporation (PBGC) — a federal agency — steps in and pays a portion of your pension, up to a legal limit (in 2024, roughly $5,000 per month for someone retiring at 65). Government pensions are backed by the government itself and are generally safer. A 401(k) is not affected by employer bankruptcy because it is your property, not the company's.

Should I take a lump sum from my pension or monthly payments?

This depends on your health, life expectancy, and investment skill. Monthly payments are safer if you expect to live a long time or are not confident managing money. A lump sum gives you more control and flexibility but requires discipline. Consider talking to a financial advisor before deciding, as this choice cannot usually be reversed.

Can I roll a pension into an IRA?

Some pensions allow a direct rollover to an IRA, but many do not. You would need to ask your pension administrator. If a rollover is allowed, you can then manage the money yourself in the IRA. If it is not allowed, you must leave the money in the pension and collect monthly payments at retirement.

What if I die before I collect my full pension?

This depends on the pension's survivor options. Most pensions offer a choice: a higher monthly payment for you alone, or a lower payment that continues to your spouse or beneficiary after you die. A 401(k) passes to your beneficiaries as part of your estate, so they receive whatever balance remains.