OPM Retirement Calculator

Estimate your federal retirement annuity under the Federal Employees Retirement System (FERS) or the Civil Service Retirement System (CSRS). This calculator projects your annual and monthly pension based on your high-3 average salary, years of creditable service, and retirement system. See how your benefit is calculated and how it might grow over time with Cost-of-Living Adjustments (COLAs).

This tool is for current or former federal employees planning for retirement. Whether you're trying to decide the best date to retire, comparing different scenarios, or just want to understand your benefits better, this calculator provides a clear starting point. For a complete picture, use this alongside the TSP match calculator and the general retirement calculator to factor in all your savings.

The results show your projected monthly and annual pension, the percentage of your salary this income replaces, and the potential benefit for a surviving spouse. You'll also see charts illustrating how your pension income could change throughout retirement, both in nominal dollars and in today's dollars after adjusting for inflation.

Start by selecting your retirement system: FERS or CSRS. Most federal employees hired after 1983 are in FERS, while those hired before are typically in CSRS. This choice determines which formula the calculator uses.

Next, enter your salary and service details. Your "High-3 Average Salary" is the average of your highest 36 consecutive months of basic pay. "Years of Creditable Service" is the total time you've worked that counts toward your pension, including any bought-back military time.

Then, input your retirement timeline and assumptions. Enter your "Planned Retirement Age" and "Life Expectancy" to project the total lifetime value of your pension. The "COLA Rate" is your assumed annual Cost-of-Living Adjustment, which increases your pension over time to help keep pace with inflation. The "Survivor Benefit" is the percentage of your annuity you wish for a surviving spouse to receive.

For a more detailed projection, open the advanced settings. Here you can add your estimated Social Security benefit and a general "Inflation Rate" to see how the real purchasing power of your pension might change over time.

Retirement System (FERS vs. CSRS)

Your retirement system is the most critical input.

• FERS (Federal Employees Retirement System) is a three-tiered system that includes a Basic Benefit (pension), Social Security, and the Thrift Savings Plan (TSP). Most federal civilian employees hired since 1984 are covered by FERS.
• CSRS (Civil Service Retirement System) is a defined benefit plan that generally provides a more generous pension than FERS. However, CSRS employees typically do not pay Social Security taxes or receive Social Security benefits based on their federal service. This system was largely phased out for new hires after 1983.

High-3 Average Salary

This is the highest average basic pay you earned during any 36 consecutive months of service. It is the foundation of your annuity calculation. Basic pay includes locality pay but generally excludes overtime, bonuses, or awards. To calculate it, find the 36-month period where your salary was highest and average those monthly salaries.

Years of Creditable Service

This is the total number of years you have worked in a position subject to FERS or CSRS retirement deductions. It can also include unused sick leave (for FERS and CSRS) and certain types of military service for which you have made a deposit (military buyback). More years of service directly increase your final pension amount.

Planned Retirement Age

Your age at retirement affects both your eligibility and, in some cases, the FERS calculation formula. For example, FERS employees who retire at age 62 or older with at least 20 years of service receive a higher 1.1% multiplier instead of the standard 1%. Use our retirement age calculator to explore different scenarios.

Life Expectancy

This input helps the calculator estimate the total lifetime value of your pension payments. It's a planning assumption, not a prediction. Many financial planners suggest using an age like 90 or 95 to be conservative, reducing the risk of outliving your financial plan.

COLA Rate

The Cost-of-Living Adjustment (COLA) is an annual increase to your pension to help it keep pace with inflation. The calculation differs between systems. CSRS retirees typically receive a COLA equal to the full increase in the Consumer Price Index (CPI). FERS COLAs are often lower; if the CPI increase is between 2% and 3%, the COLA is 2%. If the CPI is over 3%, the COLA is the CPI minus 1%. This calculator uses a single rate for simplicity.

Survivor Benefit

This is the ongoing pension your spouse would receive if you pass away. You can typically elect a full benefit (50% of your annuity for FERS, 55% for CSRS) or a partial benefit. Electing a survivor benefit will cause a small reduction in your own monthly annuity payment.

The calculator applies the official OPM formula based on your selected retirement system (FERS or CSRS).

For FERS, it calculates the Basic Annuity using a multiplier, your high-3 salary, and your years of service. It automatically applies the enhanced 1.1% multiplier if you meet the criteria (age 62+ with 20+ years of service); otherwise, it uses the standard 1% multiplier.

For CSRS, it uses a tiered formula that applies different percentages to different periods of service: 1.5% for the first 5 years, 1.75% for the next 5 years, and 2% for all years over 10. The calculator also applies the CSRS maximum benefit rule, capping the annuity at 80% of your high-3 average salary.

After calculating the initial annual annuity, the calculator determines the monthly payment and the survivor benefit based on your selected percentage. It then projects this income forward year by year until your life expectancy, applying the annual COLA you entered. The chart of "real" income shows the purchasing power of your pension after accounting for the general inflation rate.

The calculator does not account for the FERS Annuity Supplement, state taxes on pension income, or the reduction in your annuity to pay for a survivor benefit.

The formulas used are based on OPM guidelines for FERS and CSRS.

FERS Annuity Formula

The calculator first determines the correct multiplier.

IF retirement age >= 62 AND years of service >= 20
  FERS multiplier = 0.011
ELSE
  FERS multiplier = 0.010

Then, it calculates the annual annuity.

FERS annual annuity = high-3 salary x FERS multiplier x years of service

CSRS Annuity Formula

The CSRS formula is tiered based on years of service.

Annuity for first 5 years = 0.015 x high-3 salary x min(5, years of service)
Annuity for next 5 years = 0.0175 x high-3 salary x min(5, max(0, years of service - 5))
Annuity for remaining years = 0.020 x high-3 salary x max(0, years of service - 10)

The total CSRS annuity is the sum of these parts, capped at 80% of the high-3 salary.

CSRS annual annuity = Annuity for first 5 years + Annuity for next 5 years + Annuity for remaining years
CSRS annuity cap = high-3 salary x 0.80
Final CSRS annuity = min(CSRS annual annuity, CSRS annuity cap)

Other Formulas

Understanding the key differences between FERS and CSRS is crucial for federal retirement planning.

1. The Three-Legged Stool (FERS): FERS was designed as a "three-legged stool" for retirement income:

• Basic Benefit: The pension calculated by this tool. It's generally less generous than the CSRS pension.
• Social Security: FERS employees pay Social Security taxes and earn benefits, which form a core part of their retirement income.
• Thrift Savings Plan (TSP): FERS employees receive an automatic 1% agency contribution to their TSP and up to 4% in matching contributions, for a total of 5%. This is a key advantage for building a large nest egg. Use the TSP match calculator to see its impact.

2. The Standalone Pension (CSRS): CSRS was designed to be the primary source of retirement income.

• Generous Pension: The CSRS formula is more heavily weighted, resulting in a much larger pension for the same years of service and salary.
• No Social Security: Most CSRS employees do not contribute to or earn Social-Security credits during their federal service. They may be subject to the Windfall Elimination Provision (WEP) or Government Pension Offset (GPO) if they have other Social Security earnings. See the Social Security WEP calculator for details.
• No TSP Match: CSRS employees can contribute to the TSP, but they do not receive any agency matching funds.

In short, FERS relies on a combination of a smaller pension, Social Security, and significant tax-deferred savings in the TSP. CSRS relies almost entirely on a larger pension.

To receive an immediate, unreduced FERS annuity, you must meet certain age and service requirements.

• Age 62 with 5 Years of Service (62+5): You can retire with a full, immediate pension.
• Age 60 with 20 Years of Service (60+20): You can retire with a full, immediate pension.
• Minimum Retirement Age (MRA) with 30 Years of Service (MRA+30): Your MRA depends on your birth year (it's 57 for those born in 1970 or later).
• Minimum Retirement Age (MRA) with 10 Years of Service (MRA+10): You can retire, but your pension will be reduced by 5% for every year you are under age 62 unless you postpone receiving it.

This calculator assumes you are eligible for an immediate annuity. If you retire under MRA+10 rules, your actual benefit may be lower than shown unless you wait to start payments.

Monthly & Annual Annuity: This is your gross (pre-tax) pension payment. This is the core number you'll use for your retirement budget planning.

Replacement Rate: This shows what percentage of your pre-retirement high-3 salary your pension replaces. For FERS employees, a rate of 25-40% is common; this is designed to be supplemented by Social Security and TSP withdrawals. For CSRS, this rate is much higher, often 50-75%.

Survivor Benefit: This is the monthly amount your surviving spouse would receive. This provides crucial financial protection but comes at the cost of a reduction to your own pension.

Lifetime Pension: This is a projection of the total nominal dollars you might receive from your pension over your expected lifetime, including COLAs.

Pension Income Over Time Chart: This visualizes the impact of COLAs. The "Nominal Income" line shows the actual dollars you'll receive, which increases over time. The "Real Income" line shows the purchasing power of that money after factoring in inflation. If your COLA rate is lower than the inflation rate, you'll see your real income slowly decline.

If your projected annuity is lower than you'd like, you have several options:

1. Work Longer: Each additional year of service increases the multiplier in your pension formula. This is the most direct way to boost your annuity.
2. Increase Your High-3 Salary: Seek promotions or assignments that increase your basic pay. A higher high-3 average has a powerful effect on the final calculation.
3. Aim for the 1.1% FERS Multiplier: If you are a FERS employee, working until at least age 62 with 20 or more years of service boosts your calculation multiplier by 10% (from 1.0% to 1.1%), which can add thousands to your annual pension.
4. Buy Back Service Time: If you have eligible military or temporary civilian service time, making a deposit to "buy it back" can add to your years of creditable service.
5. Maximize Your TSP: While this doesn't increase your pension, maximizing your Thrift Savings Plan contributions is essential for FERS employees. At a minimum, contribute 5% of your salary to receive the full agency match. Use the 401(k) calculator to project your TSP growth.

1. Miscalculating High-3 Salary: Using your current salary instead of the correct 36-month average can lead to an inaccurate estimate.
2. Forgetting Unused Sick Leave: At retirement, your unused sick leave balance is converted into additional creditable service, which can increase your annuity.
3. Ignoring Survivor Benefit Costs: Electing a survivor benefit reduces your own pension. It's a critical decision that requires careful thought about your spouse's financial future.
4. Underestimating Taxes: Your federal pension is generally taxable at the federal level. Some states also tax pension income, while others do not. See the best states to retire for taxes.
5. Relying Only on the Pension (FERS): FERS employees must remember their pension is just one part of their plan. A successful FERS retirement depends heavily on robust TSP savings and Social Security.