CSRS Retirement Calculator: How to Use It
CSRS is one of the most generous defined benefit plans in the country. Understanding the tiered formula is what separates a good retirement estimate from a bad one.
What this calculator does
The CSRS Retirement Calculator applies the Civil Service Retirement System's three-tier formula to your high-3 average salary and years of creditable service. It adds sick leave credit, applies the 80% benefit cap, and shows your monthly and annual gross pension. If you're a CSRS-Offset employee, there's an additional adjustment for the Social Security component built into your benefit.
CSRS was closed to new employees in 1987 when FERS was created. If you're still under CSRS, you almost certainly have significant tenure and the formula rewards that. At 30 years, the multiplier reaches 56.25%. At 41.5 years, the 80% cap kicks in and additional service no longer increases the benefit.
What each input means
High-3 average salary
The average of your three consecutive highest years of basic pay. Same concept as FERS. Find it on your SF-50 Notification of Personnel Action forms. CSRS basic pay excludes overtime, bonuses, and awards. Locality pay is included for most employees.
If your salary has grown significantly over your career, your high-3 will almost always be your three most recent full years before retirement. If you took a reduction in grade, look back further.
Years of creditable service
Civilian federal service counts, as does military service if you made the required deposit. Deposit amounts for post-1956 military service are 7% of military basic pay (higher than the FERS rate of 3%). Part-time service is prorated.
Sick leave is not included here as a separate input because the calculator adds it automatically. Enter your full years and months of creditable service, then enter your unused sick leave hours separately.
Unused sick leave
CSRS employees get full credit for unused sick leave at retirement. OPM converts hours to days to months using a 2,087-hour work-year. Enter your hours from your most recent leave and earnings statement. Using all your sick leave before retirement is a common mistake. Every 174 hours is worth about one month of additional service credit.
How the tiered formula works
The three tiers apply sequentially to your total years of service:
- First 5 years: 1.5% per year (maximum 7.5%)
- Years 6 through 10: 1.75% per year (maximum 8.75%)
- Years 11 and beyond: 2.0% per year
At exactly 30 years, you've earned 7.5% plus 8.75% plus 40%, which equals 56.25% of your high-3. A $100,000 high-3 at 30 years produces $56,250 annually. That's $4,688 per month before taxes and any survivor benefit election.
The 80% cap
Federal law caps the CSRS benefit at 80% of your high-3. You hit that ceiling at approximately 41 years and 11 months of creditable service (including sick leave credit). Working beyond that point doesn't increase your pension, though it may affect your survivor benefit calculation.
CSRS-Offset employees
If you were rehired after a break in service after 1983 and had previous Social Security coverage, you may be CSRS-Offset rather than straight CSRS. The pension formula is the same, but your benefit is reduced by your Social Security benefit attributable to your federal service when you become eligible for Social Security. The offset is typically small and the overall combined benefit is comparable to straight CSRS.
Related calculators
Frequently asked questions
How does the CSRS tiered formula work?
Three multipliers applied in sequence: 1.5% for years 1-5, 1.75% for years 6-10, 2.0% for years 11 and beyond. They accumulate. Thirty years produces a total multiplier of 56.25%. The maximum benefit is capped at 80% of your high-3.
Does CSRS count sick leave toward retirement?
Yes, fully. Unused sick leave converts to additional creditable service. About 2,087 hours equals one full year. Use your leave and earnings statement to find the exact balance. Don't use sick leave before retirement just to use it up.
What is the CSRS Social Security situation?
Most CSRS employees didn't pay into Social Security during federal service and don't earn credits for it. If you have Social Security from other jobs, the Windfall Elimination Provision may reduce your SS benefit because you also receive a CSRS pension.
Can CSRS employees contribute to TSP?
Yes, up to the IRS annual limit, but with no agency match. The contribution is voluntary and acts as a supplement to the defined benefit pension. FERS employees get up to 5% agency match; CSRS employees get nothing.
What is the CSRS minimum retirement age?
Age 55 with 30+ years, age 60 with 20+ years, or age 62 with 5+ years. Early voluntary retirement (age 50 with 20 years, or any age with 25 years) requires OPM authorization. Unlike FERS, there's no MRA that varies by birth year.