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If you receive $1,100 per month in SSDI payments, you would only receive $1,300 per month from the FERS program due to the amount you are collecting from the SSA. This would still total $2,400 per month. You would just be getting a portion of that $2,400 from FERS and a portion from SSDI. After the first 12 months of your disability you will receive 40 percent of your 3-year-average high salary minus 60 percent of whatever you receive in SSDI benefits.
To be eligible for disability retirement, you must meet all of the following requirements: 1  You must have worked for a federal employer for at least 18 months (under FERS) or 5 years (under CSRS). 2  You must be disabled and no longer able to perform one or more of the essential functions of your current position.