What Is a Government Pension and How Does It Work?

A government pension is a lifetime monthly retirement payment funded by a federal, state, or local government employer and paid to eligible public employees after they retire. The amount you receive is based on how long you worked in covered service and what you were paid near the end of your career, and you typically have to reach a minimum age and a minimum number of years on the job before you can collect. Most federal civilian workers hired since 1984 earn their pension through the Federal Employees Retirement System (FERS), which pairs the pension itself with Social Security and a tax-deferred savings account. State and local systems for teachers, police, firefighters, and other public workers follow the same basic idea but set their own rules.

Who Earns a Government Pension

Federal civilian employees fall into one of two systems. Workers hired before 1984 generally belong to the Civil Service Retirement System (CSRS). Everyone hired after that date participates in FERS.¹ The two use different benefit formulas, different contribution rates, and different cost-of-living rules, so knowing which one covers you is the starting point for every other question.

Members of the armed forces earn retirement benefits through a separate military retirement system covering the Army, Navy, Air Force, Marines, Space Force, and reserve components. The eligibility rules and benefit math there sit in an entirely different framework and depend heavily on when the service member entered.

State and local governments run their own pension plans for public school teachers, law enforcement, firefighters, transit workers, municipal clerks, and other government employees. No single federal statute governs them. Vesting periods commonly range from five to ten years depending on the plan and hire date, and every other feature — the formula, the contribution rate, the retirement age — is set by the specific employer.

The Three Parts of a Federal Pension

Under FERS, the word “pension” is a little misleading, because the retirement package has three separate pieces and the pension alone replaces a fairly modest share of pre-retirement pay. The three parts are the FERS Basic Benefit (the pension annuity), Social Security, and the Thrift Savings Plan (TSP).²

Your agency withholds payroll deductions for both the Basic Benefit and Social Security and pays its share as well. The TSP works like a private-sector 401(k). Your agency automatically deposits 1% of your basic pay into your TSP each pay period whether or not you contribute yourself, and if you do contribute, the agency matches up to another 4%, for a total agency contribution of up to 5%.² Two of the three parts, Social Security and the TSP, are portable, so they follow you if you leave federal service before retirement.

CSRS is different. CSRS employees do not participate in Social Security through their federal work and do not receive agency TSP matching, though they can contribute to a TSP account on their own. The CSRS pension formula is more generous to compensate.

How the Monthly Payment Is Calculated

Both CSRS and FERS annuities are built from two numbers: your years of creditable service, and your “high-3” average salary, which is the highest average basic pay you earned during any three consecutive years. That period is usually your final three years, but it can be an earlier stretch if you were paid more then.³

The FERS Formula

Under FERS, the basic annuity equals 1% of your high-3 for each year of creditable service. If you retire at age 62 or older with at least 20 years of service, the multiplier rises to 1.1% for your entire career, not just the years after 62.³ The bump sounds small. Over a 30-year career with a $90,000 high-3, it adds roughly $2,700 per year.

The CSRS Formula

CSRS uses a tiered formula that pays more per year of service:

1.5% of your high-3 for each of the first 5 years
1.75% of your high-3 for each of the next 5 years
2% of your high-3 for every year beyond 10

A CSRS employee retiring after 30 years on a $90,000 high-3 would receive roughly $50,625 per year before deductions, substantially more than a comparable FERS annuity. The difference reflects the fact that CSRS employees generally do not earn Social Security benefits from their federal service.⁴

Unused Sick Leave

If you retire on an immediate annuity, your unused sick leave at retirement converts into extra months of creditable service for the computation. This credit counts only for figuring your benefit; it cannot help you meet the minimum service you need to qualify for retirement in the first place.⁵ Every 174 hours of sick leave roughly adds a month, using the 2,087-hour work-year chart.

When You Can Start Collecting

Eligibility comes down to a combination of age, years of creditable service, and which system covers you. Several distinct pathways exist.

Vesting

Under FERS, five years of creditable civilian service makes you vested, meaning you have a legal right to a future retirement benefit.⁶ If you leave federal service after vesting but before retirement age, you can apply for a deferred annuity that begins at age 62.⁷ State and local plans set their own vesting periods, commonly five to ten years, with some jurisdictions moving to longer periods for newer hires.

Immediate Retirement

An immediate annuity starts within 30 days of your last day of work. Under FERS, you qualify for an immediate, unreduced annuity if you meet one of these combinations:

Age 62 with at least 5 years of service
Age 60 with at least 20 years of service
Your Minimum Retirement Age (MRA) with at least 30 years of service

Your MRA depends on your birth year and ranges from 55 for people born before 1948 to 57 for those born in 1970 or later.⁶

MRA Plus 10

If you reach your MRA with at least 10 years of service but fewer than 30, you can retire right away, but your annuity is permanently reduced by 5% for each year you are under age 62.⁸ The reduction works out to 5/12 of 1% for each full month under 62.⁹ A 57-year-old retiring this way takes a 25% permanent cut. Many people underestimate that.

Public Safety and Other Special Categories

Federal law enforcement officers, firefighters, and certain other special-category employees can retire earlier than the general workforce. Under FERS, they qualify for an immediate, unreduced annuity at age 50 with 20 years of covered service, or at any age with 25 years.⁶ These employees also face mandatory retirement, typically at age 57, once they have 20 years in a covered position. State and local systems often include similar early-retirement provisions for public safety workers, with the exact terms set by each plan.

How the Payment Changes After You Retire

Once you are receiving an annuity, it adjusts each year based on changes in the Consumer Price Index for Urban Wage Earners and Clerical Workers (CPI-W). The Department of Labor measures the third-quarter average against the same quarter a year earlier to set the cost-of-living adjustment (COLA).¹⁰

CSRS retirees receive the full CPI-W increase. FERS retirees get a slightly reduced version. If the CPI-W increase is 2% or less, FERS retirees receive the full amount. Between 2% and 3%, the FERS COLA is capped at 2%. Above 3%, FERS retirees receive one percentage point less than the full increase.¹⁰ The gap compounds over a 20- or 30-year retirement, which is part of why FERS was built to lean on Social Security and the TSP as well.

How a Government Pension Interacts With Social Security

For decades, two provisions reduced Social Security benefits for people who also received a government pension from work not covered by Social Security. The Windfall Elimination Provision (WEP) lowered your own Social Security retirement benefit. The Government Pension Offset (GPO) reduced spousal or survivor Social Security benefits by two-thirds of your government pension amount.¹¹

Both were repealed by the Social Security Fairness Act, signed on January 5, 2025. The repeal is retroactive to January 2024, so December 2023 was the last month either provision applied. Affected retirees received one-time retroactive payments covering the increase back to January 2024, and the Social Security Administration completed more than 3.1 million payments totaling $17 billion by mid-2025.¹²

For CSRS retirees and for state and local retirees whose work was not covered by Social Security, this matters. If you split your career between covered and non-covered employment, your own Social Security benefit is no longer run through the WEP formula. If you receive a government pension and also qualify for Social Security spousal or survivor benefits, the GPO reduction no longer applies.

What Happens to Your Spouse

When you retire under FERS, you can elect a survivor annuity so your spouse keeps receiving part of your pension after you die. It is not automatic. You must choose it, and it lowers your own monthly payment for life.

Two options are available. A full survivor benefit pays your surviving spouse 50% of your unreduced annuity and reduces your own monthly payment by 10% for life. A partial survivor benefit pays 25% and reduces your own payment by 5%.¹³

If you are married at retirement, the full survivor benefit is the default unless your spouse consents in writing to a lower amount or to no survivor benefit at all. Skipping this election to raise your monthly check is one of the most consequential decisions in the retirement process, and it cannot easily be undone once your case is finalized.

You can also provide a survivor annuity to someone with an “insurable interest” in you, such as a former spouse or dependent relative. That survivor receives 55% of the retiree’s annuity after the insurable-interest reduction, and the cost to your own annuity is steeper than the standard spousal election.¹⁴

If You Leave Federal Service Before Retirement

If you leave before meeting the age and service rules for any type of retirement, you have two choices. With at least five years of creditable civilian service, you can leave your contributions in the system and apply for a deferred annuity once you reach the eligible age.¹⁵ Or you can request a lump-sum refund of your FERS retirement contributions. Taking the refund forfeits any future annuity based on that service.

Since October 2009, FERS employees who took a refund and later returned to federal service can redeposit the refunded amount. If the redeposit is not paid, the earlier period of service still counts toward the five-year vesting requirement and toward your high-3 salary, but it does not count in the annuity computation.¹⁵ If there is any chance you might come back, think carefully before asking for a refund.

1
Office of the Law Revision Counsel. 5 USC Chapter 84 – Federal Employees Retirement System
2
U.S. Office of Personnel Management. FERS Information
3
U.S. Office of Personnel Management. Computation – OPM
4
U.S. Office of Personnel Management. Computation
5
U.S. Office of Personnel Management. Creditable Service
6
U.S. Office of Personnel Management. Eligibility
7
Office of Personnel Management. Federal Employees Retirement System (An Overview of Your Benefits) RI 90-1
8
U.S. Office of Personnel Management. What Is a Minimum Retirement Age (MRA) Plus 10 Annuity Under the Federal Employees Retirement System (FERS)
9
GovInfo. 5 USC 8415 – Computation of Basic Annuity
10
U.S. Office of Personnel Management. How Is the Cost-of-Living Adjustment (COLA) Determined
11
Social Security Administration. Program Explainer: Government Pension Offset
12
Social Security Administration. Social Security Fairness Act: Windfall Elimination Provision (WEP) and Government Pension Offset (GPO)
13
Office of Personnel Management. Information for FERS Annuitants
14
eCFR. Federal Employees Retirement System – Death Benefits and Employee Refunds
15
U.S. Office of Personnel Management. Former Employees