BikerDude:
WOW! Your explanation explains something that I previously misunderstood. I thought the offset was against the amount paid by SS, not FERS. Based on the information you gave, FERS is the one that is reduced, not SSDI. Boy, that sucks big time. I sure hope whomever has been shafted by this, as evident by prior posts, get favorable rulings. Good luck to Mr. McGill and those affected by this FERS/SSDI "policy".
To help explain this I'll provide a little history (taken from both the OPM Website and "Wikipedia", the free encyclopedia)...
Congress created the Federal Employees Retirement System (FERS) in 1986, and it became effective on January 1, 1987. Since that time, new Federal civilian employees who have retirement coverage are covered by FERS. Way back in the early 1980's Congress became concerned about the state of the Social Security Trust Fund. It was felt by moving newly hired Federal Employees from CSRS to a retirement system covered by Social Security would help bridge this growing gap.
Most new Federal employees hired on or after January 1, 1984, are automatically covered under FERS (those newly hired and certain employees rehired between January 1, 1984, and December 31, 1986, were automatically converted to coverage under FERS on January 1, 1987 -- I.E., those hired between January 1, 1984, and December 31, 1986, were covered by BOTH the old Civil Service Retirement System (CSRS) and the new Federal Employees Retirement System (FERS).
FERS is a retirement plan that provides benefits from three different sources: a Basic Benefit Plan (can be considered as a "CSRS Component"), Social Security, and the Thrift Savings Plan (TSP). The Basic Benefit and Social Security parts of FERS require you to pay your share each pay period. Your agency withholds the cost of the Basic Benefit and Social Security from your pay as payroll deductions (Social Security Tax is 6.2% of Gross Pay and the Basic Benefit Plan Deduction is 0.8% of Gross Pay). Those covered by the Civil Service Retirement System (CSRS), a defined benefit retirement plan that provides retirement, disability, and survivor benefits, have 7% of Gross Pay deducted plus a Medicare tax (currently 1.45 percent of pay). Those covered by CSRS pay no Social Security Tax.
So, now you are probably wondering what all this has to do with FERS Disability Retirement and SSDI. Well, it is simply. As we all know, Social Security has a very strict definition of disability. Furthermore, as you can see from the above, those covered by FERS pay a very small percentage of Gross Pay to the Basic Benefit plan, "CSRS Component". To make up for this "short fall", the part of the law covering FERS Disability Retirements created the 60/40 of the High-3 Salary Computations and the SSDI Offsets. (Under regular retirements the Basic Benefit Annuity is as follows: Age 62 or Older With Less Than 20 Years of Service -- 1 percent of your high-3 average salary for each year of service; Age 62 or Older at Separation With 20 or More Years of Service -- 1.1 percent of your high-3 average salary for each year of service).