Federal Retirement Annuity Calculator — FERS and CSRS Computation Methodology

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Federal Annuity Estimator

Enter your federal service details to calculate your estimated pension annuity.

Step 1 of 4

Your Federal Service

Retirement System *

Years of Creditable Service *

Months of Additional Service Partial years of service

Step 2 of 4

Your Salary

High-3 Average Salary *

Your highest 3 consecutive years of average pay

Current Annual Salary

Used for projections if not yet at high-3

Step 3 of 4

Retirement Details

Current Age *

Planned Retirement Age *

Date of Birth Year * Used to determine your Minimum Retirement Age (MRA)

Step 4 of 4

Survivor Benefit & Options

Survivor Benefit Election Reduces your annuity to provide income for your spouse after you pass

Unused Sick Leave Hours Converts to additional service credit

Your Federal Retirement Estimate

Estimated Monthly Annuity

$0 per year

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FERS Supplement

$0/mo

Approximate -- based on Social Security formula estimate

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COLA Projection

Year	Annual	Monthly

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Survivor Benefit Impact

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Sick Leave Credit

0 months

2,087 hours = 1 year of service

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Understanding Federal Retirement

Key formulas, tables, and rules that determine your federal pension

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FERS Computation Formula

FERS uses a simple percentage-based formula. Your annuity equals a multiplier times your high-3 average salary times your years of creditable service.

Standard: 1.0% x High-3 x Years
Age 62+ with 20+ years: 1.1% x High-3 x Years

Example: 1.0% x $95,000 x 30 = $28,500/yr

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CSRS Computation Formula

CSRS uses a tiered formula that increases the multiplier with more years of service. The maximum annuity is capped at 80% of the high-3.

1.5% x High-3 x first 5 years
+ 1.75% x High-3 x next 5 years
+ 2.0% x High-3 x remaining years
Cap: 80% of High-3

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FERS Supplement Explained

The FERS Special Retirement Supplement bridges the gap between your retirement date and age 62 when Social Security begins. It approximates the Social Security benefit earned during federal service.

Supplement = (FERS years / 40) x estimated SS benefit at 62

Paid from: retirement date to age 62
Requires: immediate, unreduced annuity

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Minimum Retirement Age (MRA)

Your MRA depends on your birth year. FERS employees need MRA + 30 years for an unreduced immediate annuity, or MRA + 10 years for a reduced annuity.

Birth Year	MRA
Before 1948	55
1948	55 and 2 months
1949	55 and 4 months
1950	55 and 6 months
1951	55 and 8 months
1952	55 and 10 months
1953 - 1964	56
1965	56 and 2 months
1966	56 and 4 months
1967	56 and 6 months
1968	56 and 8 months
1969	56 and 10 months
1970 and after	57

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Survivor Benefit Options

You can elect a survivor benefit to provide continuing income for your spouse after you pass away. This reduces your annuity but provides financial protection.

FERS Full: 10% reduction, spouse gets 50%
FERS Partial: 5% reduction, spouse gets 25%

CSRS Full: ~10% reduction, spouse gets 55%
CSRS Partial: ~5% reduction, spouse gets 25%

Married employees must elect at least partial
unless spouse provides written consent.

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Sick Leave Conversion Rules

Your unused sick leave at retirement is converted to additional service credit for your annuity calculation. The conversion uses a standard work-year formula.

2,087 hours = 1 year of service credit
174 hours = 1 month of service credit

Example: 1,000 hours = ~5.75 months
At $95K high-3: adds ~$45/month

Note: Sick leave does not count toward
retirement eligibility, only the computation.

Frequently Asked Questions

How is the FERS annuity calculated? ▼

The FERS basic annuity is calculated as 1% of your high-3 average salary multiplied by your years of creditable service. If you retire at age 62 or older with at least 20 years of service, the multiplier increases to 1.1%. For example, 30 years of service with a high-3 of $100,000 would yield an annuity of 1% x $100,000 x 30 = $30,000 per year, or $2,500 per month. Unused sick leave is converted to additional service credit to further increase the computation.

What is the High-3 average salary? ▼

The high-3 average salary is the highest average basic pay you earned during any 3 consecutive years of federal service. For most employees, this is the last 3 years before retirement, since pay typically increases over a career. It includes your basic pay and locality pay, but does not include overtime, bonuses, cash awards, or allowances. Both FERS and CSRS use the high-3 as the salary base in their annuity computation formulas.

What is the FERS Special Retirement Supplement? ▼

The FERS Special Retirement Supplement is a temporary benefit paid to FERS employees who retire before age 62 with an immediate, unreduced annuity (typically MRA + 30 years, or age 60 + 20 years). It approximates the Social Security benefit you earned during your years of FERS-covered federal service. The supplement is paid from your retirement date until age 62, when you become eligible for actual Social Security. It is subject to the Social Security earnings test if you have income from other employment. The approximate formula is: (years of FERS service / 40) multiplied by your estimated Social Security benefit at age 62.

How does the survivor benefit affect my annuity? ▼

Electing a survivor benefit reduces your monthly annuity during your lifetime to provide continuing income for your eligible spouse after your death. Under FERS, a full survivor benefit costs a 10% reduction to your annuity and pays your spouse 50% of your unreduced annuity amount. A partial survivor benefit costs a 5% reduction and pays your spouse 25%. Under CSRS, a full survivor benefit costs approximately 10% and pays 55% of your annuity. Married employees are required to elect at least a partial survivor benefit unless their spouse provides written consent to waive it.

Can I use sick leave to increase my annuity? ▼

Yes. Both FERS and CSRS employees receive credit for their unused sick leave balance at retirement. Sick leave is converted to additional service credit using the standard conversion rate of 2,087 hours per year of service (approximately 174 hours per month). For example, 1,000 hours of unused sick leave adds about 5.75 months of service credit to your annuity computation. While sick leave credit does not count toward meeting retirement eligibility requirements, it directly increases the service years used in your annuity formula, which increases your monthly payment for life.

When can I retire under FERS? ▼

FERS employees have four main retirement eligibility options: (1) MRA + 30 years -- immediate, unreduced annuity with FERS supplement; (2) MRA + 10 years -- immediate annuity, but reduced by 5% for each year you are under age 62 (you can delay the annuity start to reduce or eliminate the penalty); (3) Age 60 + 20 years -- immediate, unreduced annuity with FERS supplement; (4) Age 62 + 5 years -- immediate, unreduced annuity with the enhanced 1.1% multiplier. The Minimum Retirement Age (MRA) ranges from 55 to 57 depending on your birth year. Special provisions apply to law enforcement officers, firefighters, and air traffic controllers.