Even after a claim for Social Security Disability Insurance (SSDI) is approved by the Social Security Administration (SSA), beneficiaries typically wait one to two months before receiving their first SSDI payment. In many cases, back pay associated with an SSDI claim will take even longer—though this back pay should reflect the time that has passed between the approval and the first payment. If you haven’t received SSDI benefits within 90 days of approval, have your attorney contact the SSA.