How is Your Retirement Annuity Calculated When Switching From CSRS to FERS?

How is a retirement annuity calculated for someone who switched from CSRS to FERS?

Q.  How is a retirement annuity calculated for someone who switched from CSRS to FERS?

A.  Individuals can transfer from CSRS to FERS in an open season (there have only been two of them and the most recent one was almost 20 years ago), or if they leave federal employment and return after a break in service of three days or more.

Transferees (also called TransFERS employees) get both a CSRS annuity (covering the years they worked under CSRS) and a FERS annuity (covering the years they worked under FERS).

Let’s say that an employee left federal service after spending 15 years under CSRS and, upon their return to federal service, elected to be covered under FERS. They retired after having worked 18 years under FERS. This employee has a high-three salary of $75,000.

Years of service Percentage factor Amount
15 years of CSRS 26.25% $19,687.50
18 years of FERS

18% at the 1% factor

19.8% at the 1.1% factor



Total pension

If FERS time = 1%

If FERS time = 1.1%



The CSRS part of the pension would receive CSRS cost-of-living adjustments, while the FERS part would receive FERS cost-of-living adjustments. Survivor benefits would be based strictly on FERS rules. Rules for deposit service, redeposit service and military deposits would be based on when the service took place.

Agencies can request to have John Grobe, or another of Federal Career Experts' qualified instructors, deliver a retirement or transition seminar to their employees. FCE instructors are not financial advisers and will not sell or recommend financial products to class participants. Agency Benefits Officers can contact John Grobe at to discuss schedules and costs.

About the Author

John Grobe is President of Federal Career Experts, a firm that provides pre-retirement training and seminars to a wide variety of federal agencies. FCE’s instructors are all retired federal retirement specialists who educate class participants on the ins and outs of federal retirement and benefits; there is never an attempt to influence participants to invest a certain way, or to purchase any financial products. John and FCE specialize in retirement for special category employees, such as law enforcement officers.