Disability payments under SSD are determined by your earnings record. Social Security uses your Primary Insurance Amount (PIA) which can be found on your Earnings Record with Social Security. SSDI payments are based upon lifetime earnings, not the severity of your disability. It is also important to note that SSDI benefits are reduced if you receive Workers Compensation payments. If you are entitled to benefits under SSDI, then the most that you could receive is $2,639 for 2016.