What Is a Defined Benefit Plan and How Does It Work?

A defined benefit plan is an employer-sponsored retirement plan that promises you a specific monthly payment for life once you retire, calculated by a formula tied to your salary and years of service rather than to investment returns. Your employer funds the plan, hires the investment managers, and carries the risk if the fund underperforms. About 15% of private-sector workers still have access to one, though these plans remain common among government employees and in some unionized industries.¹

How Your Benefit Is Calculated

Most defined benefit plans use a formula that multiplies three numbers: your years of service, your average salary near the end of your career, and a fixed percentage called a multiplier. The salary piece typically averages your highest three or five consecutive years of earnings. Under the federal FERS system, it’s the highest three years. The multiplier commonly falls between 1% and 2%, though government plans for occupations like law enforcement and firefighters often use higher multipliers for the first 20 years of service.²

Here’s the math in practice. An employee retiring after 30 years with a $70,000 average salary and a 2% multiplier gets 30 × $70,000 × 0.02 = $42,000 per year, or $3,500 per month for life. That predictability is the point. You can project your retirement income decades ahead.

Two ceilings shape what the formula actually delivers. Federal law caps the annual benefit any defined benefit plan can pay at $290,000 for 2026, adjusted for inflation each year.³⁴ Most workers never come near it. The second ceiling is inflation itself: plans aren’t required to raise your benefit after payments begin. Most government pensions include annual cost-of-living increases, but the vast majority of private-sector pensions do not. Even 3% annual inflation cuts a fixed payment’s purchasing power roughly in half over 25 years, so if your plan has no cost-of-living adjustment, that erosion belongs in your retirement math.

Who Pays and Who Bears the Risk

Your employer shoulders the financial responsibility. The company contributes money into a trust fund managed by professional investment managers and absorbs the loss if those investments underperform. Some plans require or allow employee contributions, but the core obligation sits with the employer.⁵

Actuaries regularly calculate how much the employer needs to contribute to keep the fund healthy enough to cover every participant. Federal law sets minimum funding standards. When plan assets fall below 80% of what the plan owes, it enters “at-risk” status, which triggers stricter contribution requirements and restrictions on paying lump sums or increasing benefits.⁶ If the employer still misses required contributions, an excise tax applies on top of the shortfall.⁵

This is the fundamental difference from a 401(k). In a 401(k) you choose how much to save and you carry the market risk. In a defined benefit plan the promised monthly check doesn’t depend on how the market did. That’s the employer’s problem.

When You Actually Own the Benefit

You don’t own your pension the day you’re hired. Vesting is the process of earning a legal right to the employer-funded portion of your benefit, and federal law gives employers two options for defined benefit plans:⁷

Cliff vesting. You have no right to the benefit until you complete five years of service, then become 100% vested all at once.
Graded vesting. You earn ownership gradually: 20% after three years of service, 40% after four, 60% after five, 80% after six, and 100% after seven.⁸

Leave before you’re fully vested and you forfeit the unvested portion. Any money you personally contributed is always yours. Once you’re vested, you’ve locked in a right to a benefit, but you generally can’t start collecting until the plan’s normal retirement age. Federal law says the plan must let you begin receiving benefits by the later of age 65 (or the plan’s normal retirement age, if earlier) or 10 years of service.⁸

Choosing How You Get Paid

At retirement you’ll pick a payment structure. Each involves tradeoffs between monthly income and protection for your family, and the choice is usually irrevocable once payments start.

Annuity Options

A single-life annuity pays a fixed amount each month for your lifetime and stops when you die. It produces the highest monthly payment because the plan has no obligation beyond your life. For married participants, federal law defaults to a joint and survivor annuity, which pays a reduced amount during your lifetime and then continues paying your surviving spouse between 50% and 100% of the benefit.⁹ Your spouse has to sign a written waiver for you to elect something different.

Lump-Sum Distribution

Some plans offer to pay the present value of your future payments in a single check, calculated using IRS-prescribed interest rates and mortality tables.⁹ Taking a lump sum ends your relationship with the plan and shifts investment responsibility to you. Plans that are less than 80% funded are generally prohibited from paying lump sums.⁶

Early Retirement

Many plans allow you to start collecting before normal retirement age, often as early as 55, but with a permanently reduced benefit.⁸ A common reduction is about 5% to 6% for each year before normal retirement age. Retiring at 60 instead of 65 under a plan with a 5% annual reduction means collecting 75% of your full benefit for the rest of your life. The cut is permanent. It doesn’t go back up when you turn 65.

How Pension Income Is Taxed

Monthly pension payments are taxed as ordinary income in the year you receive them. If you never put your own after-tax money into the plan, the full payment is taxable. If you did contribute after-tax dollars, a small portion of each payment is tax-free. You recover your contributions over your expected lifetime using an IRS table based on your age when payments begin.¹⁰ For most retirees receiving benefits from a qualified employer plan, the IRS requires a simplified method that divides your total after-tax contributions by a set number of anticipated monthly payments.¹¹

Lump sums face mandatory 20% federal income tax withholding if the plan pays you directly. You can avoid immediate taxation by having the plan roll the lump sum straight into an IRA or another eligible retirement plan. If you take the check yourself, you have 60 days to complete a rollover, but the 20% withholding still applies. To roll over the full balance, you’d need to make up that withheld amount from other funds; otherwise the withheld portion counts as a taxable distribution.¹²

If you haven’t started collecting by age 73, required minimum distributions kick in. Your plan may require you to begin taking benefits at that age even if you’re still employed.¹³

Cash Balance Plans

Not every defined benefit plan looks like a traditional pension. Cash balance plans are a hybrid that has become increasingly common. Instead of promising a monthly payment based on your final salary, a cash balance plan maintains a hypothetical account for each employee. Each year the employer credits your account with a set percentage of your pay (the “pay credit”) plus an “interest credit” that grows the balance at either a fixed rate or a rate tied to an index like the one-year Treasury bill.¹⁴

Despite looking like a 401(k) statement with a visible account balance, a cash balance plan is legally a defined benefit plan. The employer still bears the investment risk. If the fund’s actual investments lose money, your hypothetical account balance is unaffected.¹⁴ Cash balance plans also tend to be more portable, since you can often take your balance as a lump sum when you leave and roll it into an IRA.

If You Leave the Job Before Retirement

In a traditional defined benefit plan, if you leave after vesting but before retirement age, your benefit stays with the plan. You’ll receive a deferred vested statement showing what you’ve earned, and you collect when you reach the plan’s retirement age. The benefit is frozen at the level you earned. It won’t grow with future salary increases or additional service.

The real cost of job-hopping under a traditional pension is subtle. Because the formula uses your average salary near the end of your career, leaving mid-career means your benefit is calculated on a lower salary base than if you’d stayed. Two workers with identical total career lengths at different employers can end up with very different pension amounts, even if their lifetime earnings are similar. The worker who stayed put for 30 years almost always comes out ahead.

Cash balance plans are more forgiving. You can typically take your account balance as a lump sum when you leave and roll it into an IRA.¹⁴

If the Plan Fails

The Pension Benefit Guaranty Corporation (PBGC) acts as a safety net for private-sector defined benefit plans, funded by premiums employers pay. For plans terminating in 2026, the maximum monthly benefit the PBGC guarantees for a 65-year-old retiree is $7,789.77 under a straight-life annuity, or $7,010.79 under a joint and 50% survivor annuity.¹⁵ Retire before 65 and the guaranteed amount is lower.

The PBGC doesn’t cover everything. It doesn’t guarantee health or welfare benefits, severance pay, life insurance, or lump-sum death benefits, and it doesn’t add cost-of-living adjustments. If your plan added a benefit increase within five years before termination, that increase may not be fully guaranteed.¹⁶ The PBGC also does not cover government plans or church plans; those operate under separate rules, often with strong protections of their own but without the PBGC backstop.

When a plan does terminate, all participants become 100% vested immediately, regardless of how long they’ve worked there.¹⁷ If the plan has enough assets to pay every promised benefit, the employer distributes those assets either as lump sums or by buying annuities from an insurance company, and the PBGC never takes over. If the employer can’t fund the plan fully and can demonstrate serious financial hardship, the PBGC takes over and pays benefits up to the guarantee limits, meaning participants promised more than the maximum can receive less than what their employer originally promised.¹⁸

Dividing a Pension in Divorce

Pension benefits earned during a marriage are generally treated as marital property. To divide them, a court issues a Qualified Domestic Relations Order (QDRO), which directs the plan administrator to pay a portion of the participant’s benefit to a former spouse or other dependent. A valid QDRO must include the names and addresses of both the participant and the alternate payee, identify each plan covered, specify the dollar amount or percentage to be paid, and state the time period or number of payments. The order can’t require the plan to pay a type of benefit the plan doesn’t already offer, increase benefits beyond their actuarial value, or assign benefits already granted to someone else under a prior order.¹⁹ Getting the QDRO drafted correctly before or during the divorce matters. Fixing errors afterward is expensive and sometimes impossible.

1
Bureau of Labor Statistics. 31 Percent of Workers in Financial Activities Had Access to a Defined Benefit Retirement Plan
2
U.S. Office of Personnel Management. Computation
3
Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs
4
Office of the Law Revision Counsel. 26 USC 415 – Limitations on Benefits and Contribution
5
Internal Revenue Service. Defined Benefit Plan
6
Office of the Law Revision Counsel. 29 USC 1083 – Minimum Funding Standards for Single-Employer Defined Benefit Pension Plans
7
Office of the Law Revision Counsel. 26 USC 411 – Minimum Vesting Standards
8
U.S. Department of Labor. FAQs About Retirement Plans and ERISA
9
Office of the Law Revision Counsel. 29 USC 1055 – Requirement of Joint and Survivor Annuity and Preretirement Survivor Annuity
10
Office of the Law Revision Counsel. 26 USC 72 – Annuities; Certain Proceeds of Endowment and Life Insurance Contracts
11
Internal Revenue Service. Publication 575 – Pension and Annuity Income
12
Internal Revenue Service. Lump-Sum Distributions
13
Internal Revenue Service. Retirement Topics – Required Minimum Distributions (RMDs)
14
U.S. Department of Labor. Fact Sheet – Cash Balance Pension Plans
15
Pension Benefit Guaranty Corporation. Maximum Monthly Guarantee Tables
16
Pension Benefit Guaranty Corporation. Understanding Your Pension and PBGC Coverage
17
Internal Revenue Service. Terminating a Retirement Plan
18
Pension Benefit Guaranty Corporation. Pension Plan Termination Fact Sheet
19
U.S. Department of Labor. QDROs Chapter 1 – Qualified Domestic Relations Orders: An Overview