A pension pays you a monthly income in retirement, funded by your employer, based on how long you worked there and how much you earned. Unlike a 401(k), where your eventual balance depends on investment performance, a traditional pension promises a specific dollar amount each month for the rest of your life. That predictability is what makes pensions distinctive, and understanding the formula behind them helps you estimate what yours could be worth.
The Basic Pension Formula
Most pensions calculate your benefit using three numbers: a multiplier, your years of service, and your average salary near the end of your career. The formula typically looks like this:
Multiplier × Years of Service × Average Salary = Annual Pension Benefit
The multiplier is a percentage set by your employer’s plan, commonly between 1% and 2%. Your average salary is usually calculated from your highest-earning consecutive years, often the final three or five years of your career. The federal government’s pension system for civilian employees (FERS), for example, uses a “high-3” average, meaning the highest average basic pay you earned during any three consecutive years. Under FERS, the multiplier is 1% per year of service, or 1.1% if you retire at age 62 or older with at least 20 years of service.
Here’s what that looks like in practice. Say you worked 25 years and your high-3 average salary was $80,000. At a 1% multiplier, your annual pension would be 0.01 × 25 × $80,000 = $20,000 per year, or about $1,667 per month. Bump the multiplier to 1.5%, as some state or private plans use, and that same career produces $30,000 per year.
The salary figure in the formula only includes your regular base pay. Overtime, bonuses, and one-time payments generally don’t count. That’s worth knowing if a significant chunk of your compensation comes from those sources.
Defined Benefit vs. Defined Contribution
Pensions are formally called “defined benefit” plans because the benefit you’ll receive is defined in advance by a formula. Your employer bears the investment risk. The company or government entity puts money into a large fund, invests it, and is responsible for making sure there’s enough to pay every retiree what they were promised. If investments underperform, the employer has to make up the difference.
A 401(k) or 403(b), by contrast, is a “defined contribution” plan. The contribution going in is defined, but the benefit coming out depends entirely on how investments perform. You bear the risk. If the market drops right before you retire, your account balance drops with it.
Some employers offer a hybrid called a cash balance plan. It’s technically a defined benefit plan, but it looks more like a 401(k) on your statements. Each year, your account gets a “pay credit” (often around 5% of your compensation) and an “interest credit” at a fixed or indexed rate. The key difference from a true 401(k) is that investment risk still falls on the employer, not you. Your account grows by the promised credits regardless of what the underlying investments actually earn.
How Vesting Works
Vesting refers to how much of your pension benefit you actually own. Until you’re fully vested, leaving your job could mean forfeiting some or all of the employer-funded benefit. Any money you personally contributed is always 100% yours, but the employer’s portion follows a vesting schedule set by the plan.
There are two common structures. Under cliff vesting, you own 0% of the employer’s contributions until you hit a specific milestone, typically three years of service, at which point you jump to 100%. Under graded vesting, ownership increases gradually: you might vest 20% after two years, 40% after three, and so on until you reach 100% after six years. Every plan is required to vest employees fully by the time they reach the plan’s normal retirement age, or if the plan is terminated.
A “year of service” for vesting purposes generally means a 12-month period in which you worked at least 1,000 hours. If you’re considering leaving a job with a pension, check where you fall on the vesting schedule first. Walking away six months before full vesting could cost you a meaningful amount of retirement income.
When You Can Start Collecting
Most pension plans set a normal retirement age, often 65, when you can receive your full benefit. Many also allow early retirement, sometimes as young as 55, but with a reduced monthly payment. The reduction accounts for the fact that you’ll likely collect payments over a longer period.
If you take pension distributions before age 59½, the IRS may impose an additional 10% tax on top of regular income taxes. There are exceptions: if you separate from service and receive payments as a series of substantially equal periodic installments, if you’re totally and permanently disabled, or if you’re terminally ill, the penalty doesn’t apply.
Some plans let you defer your pension start date past normal retirement age, which can increase your monthly payment. The specifics vary by plan, so your summary plan description (the document your employer is required to give you) will spell out the exact ages and reduction factors.
Choosing a Payout Option
When you retire, most pensions offer several payout choices. The most common are:
- Single-life annuity: The highest monthly payment, but it stops when you die. Your spouse or heirs receive nothing after that.
- Joint and survivor annuity: A lower monthly payment during your lifetime, but a portion (commonly 50%, 75%, or 100%) continues to your spouse after your death.
- Lump-sum distribution: Some plans offer the option to take your entire pension value as a one-time payment, which you can roll into an IRA. This shifts investment responsibility to you but gives you full control.
Federal law requires that if you’re married and your plan offers a joint and survivor annuity, that’s the default option. Choosing a single-life annuity instead requires your spouse’s written consent. This rule exists to protect spouses from being left without income.
How Pension Income Is Taxed
Monthly pension payments are generally subject to federal income tax. If your employer funded the entire pension and you never made after-tax contributions, every dollar you receive is taxable as ordinary income. Most pensions work this way.
If you did contribute after-tax dollars during your career, a portion of each payment represents a return of money you already paid taxes on. That portion comes back to you tax-free. Your plan administrator can help you determine the taxable and non-taxable portions, and the IRS provides worksheets to calculate the split.
Your pension payer will withhold federal income tax from each payment, similar to how an employer withholds from a paycheck. You can adjust your withholding by submitting a Form W-4P. If you don’t submit one, the payer withholds as if you’re single with no adjustments, which often means more tax is taken out than necessary.
If you take a lump-sum distribution and don’t roll it directly into an IRA or another qualified plan, the payer is required to withhold 20% for federal taxes, even if you plan to complete the rollover yourself within 60 days.
What Happens If Your Employer Goes Under
Private-sector pensions are insured by the Pension Benefit Guaranty Corporation, a federal agency. If your employer’s pension plan fails, the PBGC steps in and pays benefits up to a legal maximum. For 2026, that maximum is $7,789.77 per month (about $93,477 per year) for someone retiring at age 65 with a single-life annuity. The cap is lower if you retire earlier and higher if you retire later. At age 55, for example, the maximum drops to $3,505.40 per month.
If your promised pension is below the PBGC maximum, you’ll typically receive the full amount. If it exceeds the cap, you’ll receive only up to the limit. Government pensions, including federal, state, and local plans, are not covered by the PBGC but are backed by the taxing authority of the government entity.
Pensions Are Becoming Rarer
If you have access to a pension, you’re in an increasingly small group. Most private-sector employers shifted to 401(k) plans starting in the 1980s because defined benefit plans are expensive to maintain and create long-term financial obligations that are hard to predict. Pensions remain more common in government jobs, unionized industries, and a handful of large corporations.
If your employer offers a pension alongside a defined contribution plan, contributing to both gives you two layers of retirement income. The pension provides a guaranteed floor, while your 401(k) or similar account adds growth potential you control. Knowing how each piece works helps you plan how much additional saving you need to do on your own.