Retirement Plans: Defined-Benefit vs. Defined-Contribution Explained

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A defined-benefit plan promises you a specific retirement income, usually a monthly payment for life calculated from your salary and years of service, and the employer carries the investment risk of funding it. A defined-contribution plan, such as a 401(k), fixes what goes into your account each year, but not what comes out: your retirement money depends on how much you and your employer contribute and how the investments perform, so the risk sits with you. Which one is “better” depends on how long you stay with the employer, how much you value guaranteed income versus control and portability, and whether you will actually save and invest consistently.

How the two plan types differ

The names describe what each plan fixes in advance.

• What is guaranteed: A DB plan guarantees a payment formula. A DC plan guarantees nothing about the final balance.
• Who funds it: DB plans are funded largely or entirely by the employer, sometimes with employee contributions. DC plans are funded primarily by the employee, with optional employer contributions.
• Who chooses investments: The employer (or an outside manager it hires) runs DB plan assets. In a DC plan, you choose from the menu the plan offers.
• Who bears investment risk: The employer, if DB returns fall short of what it owes retirees. You, if your DC investments underperform.
• What you own: A DB participant owns a claim to future payments. A DC participant owns an account balance, which can be withdrawn or rolled over within plan and tax rules.
• Portability: DC balances move with you. DB benefits stay with the plan that promised them.

How a defined-benefit plan works

A defined-benefit plan, usually called a pension, pays eligible retirees an amount set by a formula. A typical structure multiplies a percentage factor by your years of service and by a measure of pay such as your final average salary. Under a hypothetical formula of 1.5% × years of service × final average salary, an employee with 30 years and an $80,000 final average salary would receive $36,000 a year (1.5% × 30 × $80,000). Actual plans use their own factors, pay definitions and retirement-age rules.

Because the employer promises the outcome, it takes on the job of investing plan assets and paying retirees, either through its own management or an outside investment firm. If investment returns don’t cover the benefits owed, the employer has to make up the gap. Projecting those obligations requires actuaries, and guaranteeing them requires insurance, which makes these plans expensive to run. In the private sector they have largely been replaced by defined-contribution plans. They are still relatively common for state and local government workers, teachers and other public employees.

Pensions generally pay out in one of two ways:

• Annuity: Monthly payments for the rest of your life (and, under a joint-and-survivor option, potentially your spouse’s).
• Lump sum: The plan’s value of your benefit paid at once, if the plan offers that option.

The annuity is the more popular choice.

Cash balance plans are a hybrid. Legally they are defined-benefit plans, and the employer still bears the investment risk, but each participant’s benefit is expressed as a hypothetical account balance that grows with pay credits and interest credits set by the plan.

How a defined-contribution plan works

In a defined-contribution plan, you elect to defer part of your gross pay into an individual account through payroll deduction. The employer may add a matching contribution up to a limit it sets, and some employers make non-matching contributions as well. Once that money is deposited, the employer has no obligation for how the account performs, which is why these plans are cheaper and lower-risk to sponsor.

You choose how the account is invested, but only from the plan’s menu. That menu usually centers on mutual funds holding baskets of stocks, bonds or both, plus money market funds. Some plans also offer annuities or individual stocks. Traditional contributions go in pre-tax and grow tax-deferred, so you pay income tax when you withdraw in retirement. Many plans also offer a Roth option, funded with after-tax money, where qualified withdrawals are tax-free.

Contributions are capped each year. For 2025, the IRS limit on employee deferrals to a 401(k) is $23,500. Participants age 50 and older can add a $7,500 catch-up contribution, for a total of $31,000. The IRS adjusts these limits periodically for cost of living.

The common DC plans:

• 401(k): Offered by private-sector companies; the most common type.
• 403(b): Offered by public schools, colleges and universities, churches and other nonprofit or charitable organizations. These plans are often administered by insurance companies and may offer fewer investment choices than a typical 401(k).
• 457(b): Used mainly by state and local governments.

Employee stock ownership plans (ESOPs) and profit-sharing plans are also defined-contribution plans.

Example: one worker, two plans

Take a hypothetical employee, Maria, who works 30 years for one employer.

Under a DB plan, Maria makes no investment decisions. Using the hypothetical formula above, she retires with a pension of $36,000 a year for life. She doesn’t need to research funds or adjust her allocation as she ages. She also has no say in how the plan is invested and must rely on her employer to keep the plan funded.

Under a DC plan, Maria and her employer together contribute a hypothetical $10,000 a year. Her retirement balance depends on returns. Assuming contributions at the end of each year, a constant annual return, and no fees or taxes:

• At 0% return: $10,000 × 30 = $300,000
• At 5% return: $10,000 × [(1.05³⁰ − 1) ÷ 0.05] ≈ $664,000
• At 7% return: $10,000 × [(1.07³⁰ − 1) ÷ 0.07] ≈ $945,000

The same contributions produce balances that differ by hundreds of thousands of dollars, because returns compound over decades. That is what “the benefit is undefined” means in practice. Maria controls the investments. Early in her career she might hold an aggressive, stock-heavy mix, then shift toward more stable holdings as retirement nears. She also has to decide how fast to withdraw, because nothing guarantees the money lasts as long as she does.

When the answer changes

On paper the DB plan’s guaranteed lifetime income looks more attractive, and many employees prefer pensions for that reason. Several conditions can reverse the comparison.

Short tenure or frequent job changes. Pension formulas tied to years of service and final pay tend to reward long careers at one employer. Someone who works five years at each of several employers may build a much smaller combined pension than a single 30-year career would produce, even at the same pay. DC balances keep compounding when you roll them to a new plan or an IRA.

Vesting. Your own contributions to either plan are always yours. Employer-funded benefits vest on a schedule. Under federal rules, DB plans can use up to a five-year cliff or a seven-year graded schedule, while employer contributions to DC plans can use up to a three-year cliff or a six-year graded schedule. Leaving before you are vested can forfeit some or all of the employer’s share.

Inflation. A fixed pension loses purchasing power over a long retirement unless the plan includes a cost-of-living adjustment, and the U.S. inflation rate by year shows how much that erosion can add up to over two or three decades.

Saving behavior. A DC plan only works if you contribute. Its main disadvantage is that you must manage the investments and plan for retirement yourself, and employees who contribute little or nothing, skip the employer match, or cash out when changing jobs can reach retirement with far less than a pension would have provided.

Longevity and estate goals. A life annuity protects you if you live a long time but typically pays nothing to heirs once payments end, apart from any survivor benefit you elected. A DC balance remaining at death can pass to beneficiaries.

Employer strength. A pension is only as secure as its funding and the insurance behind it, which leads to the next question.

Can you lose a defined-benefit pension?

Once you are vested, the benefit you have earned is protected. Private-sector pensions are covered by ERISA, the federal law passed in 1974, and most are insured by the Pension Benefit Guaranty Corporation (PBGC). If an insured plan fails without enough assets, the PBGC pays benefits up to legal maximums, so retirees with very large pensions could receive less than promised. Government pensions are not covered by the PBGC; their protection comes from state law and the government sponsor.

If you leave before you are vested, you may lose the employer-funded portion, though any contributions you made yourself should be returned to you. If an employer terminates a plan, it must fully vest all affected participants and distribute the plan’s assets to them.

FAQs

The Bottom Line

Workers choosing between jobs or weighing a pension against a 401(k) should look past the guarantee alone. A pension tends to reward long service at one employer and spares you investment decisions, while a defined-contribution plan suits people who change jobs, contribute steadily and want money they can move or leave to heirs. Vesting schedules, inflation protection and your own saving habits often decide which plan leaves you better off.