Question: how ssdi benefits are calculated?
Answer: Your SSDI benefits are based on the amount of income on which you have paid social security taxes. ... Using your AIME, the SSA will calculate your Primary Insurance Amount (PIA). As of 2014, the PIA is calculated by taking 90% of AIME under $816, 32% of AIME between $816 and $4917, and 15% of AIME greater than $4917.