What is Social Security disability payment based upon?

Social Security disability payments are based upon countable income and the Social Security federal benefit rate. The Social Security Administration subtracts a person's countable income from the Social Security federal benefit rate, and the result is his monthly benefit amount, as stated by SSA.gov.

To receive Social Security disability payments, one must have worked long enough (based on age) and must have a medical condition that has prevented him from working for a minimum of a year, or he must have a condition that he is expected to die from. There are also programs that give monetary benefits to those who are partially disabled or who are disabled for a short period of time; these programs are not funded by Social Security, according to SSA.gov.