The core difference: who funds it and when you get paid

A pension is money your employer puts aside during your working years and pays to you as a monthly check after you retire. You do not contribute to it, and the employer guarantees a set amount based on your salary and years of service. A 401(k) is a savings account you fund yourself with money from your paycheck, and your employer may add matching contributions. You own the account, decide how it is invested, and receive whatever balance you have built up when you retire.

The pension model is simple from your perspective: work, retire, receive a check every month for life. The 401(k) model puts the work and the risk on you. You choose how much to save, where to invest it, and when to withdraw it. If your investments perform poorly, your retirement balance shrinks. If they perform well, it grows.

Most private employers stopped offering pensions decades ago. Today, pensions are common mainly in government jobs—federal, state, and local—and some union positions. Most private-sector workers have access only to a 401(k) or similar plan like a 403(b) or SIMPLE IRA.

Key Takeaways

  • A pension is funded entirely by your employer and pays a may provide monthly amount for life; a 401(k) is funded by you and your employer's optional match, and the payout depends on what you saved.
  • With a pension, the employer bears the investment risk and longevity risk; with a 401(k), you bear both.
  • Pensions are rare in private companies but standard in government and union jobs; 401(k)s are the default retirement plan for most private workers.
  • Pension payments are typically not portable—you cannot move them to another employer; 401(k)s can be rolled over to an IRA or new employer plan.
  • Pensions usually require you to work a minimum number of years (often 5 to 10) before you earn any benefit; 401(k)s are yours immediately, though employer matches may vest over time.

How employer contributions work in each plan

With a pension, your employer contributes a percentage of your salary to a fund managed by the company or a professional investment firm. You see nothing on your paycheck—the money goes directly into the pension pool. The employer is responsible for making sure the fund has enough money to pay all retirees their promised amounts. If the fund falls short, the employer must add more money. This is why pensions are expensive for employers and why most have stopped offering them.

With a 401(k), you decide how much of your paycheck to contribute—typically between 1 and 50 percent, up to a legal limit (in 2024, the limit is $23,500 per year for workers under 50). Your employer may match a portion of what you contribute, commonly 50 percent of the first 6 percent you save. So if you earn $50,000 and contribute 6 percent ($3,000), your employer adds $1,500. This match is assistance programs, but you only receive it if you contribute first. Many employers offer no match at all.

Vesting: when the money becomes yours

A vesting schedule determines when you actually own the money in the account. With a pension, you typically must work for the employer for a set period—often 5 or 10 years—before you earn any pension benefit at all. If you leave before that, you receive nothing, even though your employer was contributing on your behalf. Once you are vested, you are may have access to to a pension payment when you reach retirement age, even if you leave the job immediately.

With a 401(k), your own contributions are always yours immediately. But employer matching contributions usually vest over time—commonly 25 percent per year for four years, or 100 percent after three years. If you leave before the match fully vests, you forfeit the unvested portion. Your own savings go with you no matter when you leave.

How much you receive and when

A pension payment is calculated using a formula that typically multiplies your final average salary by your years of service by a fixed percentage. For example, a common formula is 1.5 percent times years of service times final salary. If you worked 30 years and your final salary was $60,000, your monthly pension would be $2,250 (0.015 × 30 × $60,000 ÷ 12). This amount is usually fixed for life, though some pensions adjust for inflation.

A 401(k) payout depends entirely on what you saved and how your investments performed. If you saved $500,000 by retirement, that is your balance. You can withdraw it as a lump sum, take monthly distributions, or use it to purchase an annuity that pays you monthly. There is no may provide amount. If you withdraw too much early, you run out of money. If you withdraw too little, you may leave money on the table.

Pensions typically begin at a set retirement age, often 55 to 67 depending on the employer and your years of service. You cannot access the money before that without penalties. With a 401(k), you can withdraw money at any time, but withdrawals before age 59½ usually trigger a 10 percent penalty plus income tax. At age 72, you must begin taking required minimum distributions or face a 25 percent penalty on the amount you should have withdrawn.

Portability and what happens if you change jobs

A pension is not portable. If you leave your employer, you cannot move the pension to a new job or roll it into another account. You keep whatever benefit you earned based on your vesting and years of service, and you receive it as a monthly payment starting at retirement age. If you were not vested, you lose it entirely. This locks you into staying with an employer longer than you might otherwise choose.

A 401(k) is fully portable. When you leave a job, you can roll your balance into an IRA (individual retirement account) or into your new employer's 401(k) plan if they offer one. You keep all the money you saved, plus any vested employer match. This flexibility is one reason 401(k)s became popular—workers can change jobs without losing retirement savings.

Investment control and risk

With a pension, you have no control over how the money is invested. Professional managers handle the portfolio, and the employer bears the risk if investments perform poorly. Your monthly payment is may provide regardless of market performance. This is a major advantage if you are risk-averse or do not want to think about investing.

With a 401(k), you choose from a menu of investment options—usually mutual funds, target-date funds, and sometimes company stock. You decide how aggressive or conservative to be. If you choose poorly or the market crashes, your balance shrinks. If you choose well and the market rises, your balance grows. You bear all the investment risk. Many workers find this stressful; others prefer the control.

Survivor and spousal protections

Pensions typically include survivor benefits. If you die before retirement, your spouse or designated beneficiary may receive a portion of what you would have earned. If you die after retirement begins, your spouse usually continues to receive a reduced monthly payment. The rules vary by employer, but protection is built in.

A 401(k) passes to your beneficiary as part of your estate. If you name your spouse as beneficiary, they can roll it into their own IRA or take distributions over their lifetime. If you name someone else or leave no beneficiary, the rules are more complex and may result in higher taxes. You must actively designate a beneficiary; if you do not, the account may go through probate.

Frequently Asked Questions

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

Yes. Some government employees and union members have both. The pension is usually the primary retirement benefit, and the 401(k) is supplemental. Private-sector workers rarely have both because most private employers offer only a 401(k). If you have a pension from a previous government job and now work in the private sector, you can have both simultaneously.

What happens to my pension if the company goes bankrupt?

Private pensions are insured by the Pension Benefit Guaranty Corporation (PBGC), a federal agency. If your employer cannot pay, the PBGC takes over and pays your pension, though usually at a reduced amount if the fund was underfunded. Government pensions are not insured by the PBGC but are backed by the government employer, which has not defaulted on pensions in modern history.

Can I take my 401(k) money out early without penalty?

Withdrawals before age 59½ normally trigger a 10 percent penalty plus income tax on the full amount withdrawn. Exceptions exist for hardship withdrawals (medical bills, home purchase, education), disability, or if you leave your job at age 55 or later. The rules are complex, so check with your plan administrator before withdrawing.

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

A pension is better if you want may provide income and do not want to manage investments. A 401(k) is better if you want control, portability, and the ability to leave a job without losing retirement savings. Most workers today have no choice—they get a 401(k) because pensions are rare. If you have access to a pension, it is usually worth staying long enough to vest.

Do I pay taxes on pension and 401(k) withdrawals?

Yes. Both are taxed as ordinary income when you withdraw or receive payments. Pension payments are taxed annually as you receive them. 401(k) withdrawals are taxed in the year you withdraw. If you roll a 401(k) into a traditional IRA, withdrawals from the IRA are also taxed. Roth 401(k)s and Roth IRAs are funded with after-tax money, so withdrawals are tax-free.