A 401(k) and a pension are two separate things, even though both are retirement accounts

A 401(k) is not a pension. They are different types of retirement plans with different rules about who contributes money, how much grows, and what you receive when you retire. A pension is a promise from an employer to pay you a set amount each month for life after you retire. A 401(k) is an account you and your employer contribute to during your working years, and the money you have in it at retirement is what you get — no may provide monthly payment.

The distinction matters because it changes what you owe in taxes, when you can withdraw money, and whether you have a may provide income stream in retirement. Many people have only a 401(k) and no pension at all. Some have both. Understanding which one you have — or will have — affects how much you need to save on your own.

Key Takeaways

  • A 401(k) is a defined-contribution plan where you and your employer put in money; a pension is a defined-benefit plan where the employer promises you a specific monthly payment.
  • With a 401(k), the amount you have at retirement depends on how much was contributed and how well investments performed; with a pension, your payment is set by a formula based on salary and years of service.
  • You control how a 401(k) is invested and can take the money with you if you change jobs; a pension stays with the employer and you cannot move it.
  • A 401(k) requires you to manage withdrawals in retirement; a pension automatically sends you a check each month for life.

How contributions work: who puts money in

With a 401(k), you choose how much of your paycheck to contribute, up to a limit set by the IRS each year. Your employer may match a portion of what you contribute — for example, matching 50 cents for every dollar you put in, up to 6 percent of your salary. The money is yours immediately, even if your employer's match vests over time (meaning you have to stay employed for a certain period to keep it).

With a pension, your employer contributes the money on your behalf. You typically do not choose the amount — the employer calculates it based on what they owe you under the pension formula. Some pensions require a small employee contribution, but most do not. The employer is responsible for making sure there is enough money to pay all retirees their promised amounts.

How the payout works: what you receive

A 401(k) balance is whatever money sits in your account when you retire. If you contributed $200,000 over 30 years and your investments grew to $500,000, you have $500,000 to withdraw. If the market drops and your balance falls to $400,000, that is what you have. You decide how fast to withdraw it, and the money is yours to spend or leave to heirs.

A pension calculates your monthly payment using a formula, usually based on your final salary and how many years you worked. For example, a formula might be: 2 percent of your final salary multiplied by years of service. If your final salary was $60,000 and you worked 25 years, your monthly pension would be $60,000 × 0.02 × 25 = $30,000 per year, or $2,500 per month, for life. That amount does not change if the market crashes.

Investment risk and control

With a 401(k), you choose how your money is invested — typically from a menu of mutual funds, index funds, or target-date funds offered by your plan. If you pick aggressive investments and the market falls, your balance shrinks. If you pick conservative investments and miss out on growth, you have less money in retirement. The investment risk is yours.

With a pension, the employer's investment team manages the money. You have no say in how it is invested. If the pension fund performs poorly, the employer is still legally required to pay you the promised amount. The investment risk belongs to the employer, not you. This is one reason pensions have become less common — employers prefer to shift that risk to workers.

Portability: what happens if you change jobs

A 401(k) is portable. When you leave a job, you can roll the balance into a new employer's 401(k), into an IRA, or leave it where it is (if the balance is large enough). The money follows you. You keep control of it and can continue to invest it however you choose.

A pension is not portable in the same way. If you leave a job before retirement, you typically have two options: leave the money with the employer's pension fund and receive a smaller monthly payment starting at retirement age, or take a lump-sum payment (a one-time check for the present value of your future payments). Once you leave, you cannot move the pension to another employer. It stays with the original employer's plan.

Tax treatment and required withdrawals

Money in a traditional 401(k) grows tax-deferred, meaning you do not pay income tax on the growth until you withdraw it. When you turn 73, the IRS requires you to begin taking minimum withdrawals each year, whether you need the money or not. These withdrawals are taxed as ordinary income.

Pension payments are also taxed as ordinary income when you receive them, but there are no required minimum withdrawals — you simply receive your monthly check. Some pensions offer a choice between a monthly payment for life or a lump sum, and the tax treatment differs depending on which you choose.

Why pensions are rare now and 401(k)s are common

Pensions were the standard retirement benefit for decades, especially in manufacturing, government, and union jobs. They are still common in the public sector — most state and local government employees have pensions. In the private sector, they have largely disappeared. Employers shifted to 401(k)s because they are cheaper and transfer investment risk and longevity risk to workers.

A pension requires an employer to may provide a payment for potentially 30 or 40 years after retirement. If the worker lives longer than expected or the market performs poorly, the employer still owes the money. A 401(k) requires the employer to contribute only what is agreed upon, usually a small match. After that, the worker owns whatever is in the account — no guarantees.

Frequently Asked Questions

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

Yes. Many government employees, teachers, and workers in certain industries have both. You contribute to the 401(k) during your career, and the employer also funds a pension that pays you a set amount each month starting at retirement. The two work together to provide income.

If I leave my job, do I lose my 401(k) money?

No. A 401(k) belongs to you. When you leave, you can roll it into a new employer's plan, move it to an IRA, or leave it with your former employer if the balance is large enough. The money is yours to keep or move.

What happens to my 401(k) if the company goes out of business?

Your 401(k) is protected. It is held in a separate trust account, not the company's general assets. Even if the employer fails, your money is yours. A pension, however, may be at risk if the employer cannot fund it — though the Pension Benefit Guaranty Corporation (PBGC) insures some private pensions up to a limit.

Can I withdraw from my 401(k) before retirement?

You can, but there are penalties and taxes. Before age 59½, withdrawals are taxed as ordinary income plus a 10 percent early withdrawal penalty, with some exceptions (hardship, disability, or specific circumstances). A pension does not allow early withdrawal — you receive payments only after you reach the retirement age specified in the plan.

Which is better for retirement: a 401(k) or a pension?

A pension provides may provide income for life, which is valuable and reduces worry about running out of money. A 401(k) gives you control and portability but requires you to manage the money and decide how fast to spend it. Most workers today have only a 401(k), so the question is usually how much to save in it, not which to choose.