Covered portion
Covered service is split into up to 20 years at 1.7%. Covered years beyond 20 use 1.0% in this comparison.
High-3 × min(covered years, 20) × 0.017FERS formula guide · Educational estimate
What could a special FERS formula change?
For a covered-position estimate, the first 20 years can use a 1.7% factor. The rest of the calculation uses the regular FERS factor, including 1.1% when the age-and-service rule is met. This page lets you compare the formula with your own numbers without pretending to decide eligibility.
Sources last reviewed: September 7, 2026
Clear inputsVisible mathOfficial sources
Important distinctionCovered position ≠ automatic eligibility
Confirm your retirement category, service record, and agency rules with OPM.
Boundary ruleCovered years must fit inside total service
The estimate caps the covered portion at your total years rather than creating service.
Best useCompare scenarios before a conversation
Use the result to ask better questions—not as an official benefit decision.
Build an estimate
See the formula with your numbers
Start with your High-3 and total service. The covered-service field separates the 1.7% portion from regular service so the comparison stays visible.
Read the math
How the comparison is built
Regular portion
Any service left after the covered portion uses 1.0%, or 1.1% when the calculator's age-and-service condition is met.
High-3 × remaining years × 0.010 or 0.011Add the pieces
The annual estimate is the sum of the two portions. Divide by 12 for a simple monthly comparison before deductions.
Covered annual + regular annualWorked example
Mixed covered and regular service
With a $100,000 High-3, 25 total years, 15 covered years, and age 57:
Covered: $100,000 × 15 × 1.7% = $25,500
Regular: $100,000 × 10 × 1.0% = $10,000
Total: $35,500/year · $2,958/month
Before you rely on it
Who is this special-retirement estimate for?
This comparison is for employees reviewing service that may be covered by special Federal Employees Retirement System provisions, including certain law enforcement officer, firefighter, and air traffic controller positions. It is not for deciding whether a position, service period, or retirement application legally qualifies.
What this estimate can show
- The dollar difference between a regular factor and a mixed covered-service formula.
- How service beyond the first 20 covered years changes the arithmetic.
- Why total years and covered years must be entered separately.
What it cannot decide
- Whether your job, agency, or record meets a special retirement category.
- Whether service is creditable, transferred, or documented correctly.
- Your retirement date, minimum age, supplement, survivor election, taxes, or take-home pay.
Important: If covered years exceed total service, this page shows an error rather than silently inflating the result. If your estimate is $0, treat it as a prompt to check the inputs—not as a benefits answer.
Keep researching
Which sources control the special FERS decision?
The U.S. Office of Personnel Management (OPM) controls the retirement rules and your personnel record controls the service history. Bring your estimate to a benefits specialist and verify the current rule before making an irreversible decision.
- OPM: Special Retirement ProvisionsPrimary eligibility and formula guidance for law enforcement officers, firefighters, and air traffic controllers.
- OPM: FERS computationOfficial context for the regular and special annuity formulas.
- FERS pension calculator guideSee the standard FERS formula and 1.1% comparison.
- FERS supplement guideKeep the pre-62 bridge payment separate from the annuity formula.
- Compare the regular MRA+10 pathUnderstand why regular minimum retirement age eligibility is a different decision.
Next step
Turn a formula comparison into a retirement plan
Once you have verified your service record, model retirement dates, income sources, healthcare, and deductions together in your private plan.
Open the retirement planner No eligibility decision is made here. Always verify with OPM or your agency benefits office.For educational purposes only. This calculator compares formula inputs; it is not an eligibility determination, official estimate, tax advice, or promise of benefits.
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