The OPM utilizes the High 3 average to determine Federal Disability Retirement annuity payments.
Your High 3 Average is the average of your highest 36 consecutive months of basic pay.
In many cases, federal employees find that their most recent 36 months of pay is their highest and can calculate and estimated annuity from that.
To calculate your Federal Disability Retirement annuity, you will receive 60% of your High 3 average salary the first year you are approved for disability retirement and from year two until you reach the age of 62, you will receive 40% of your High 3 each year.
