The federal government calculates Supplemental Security Income, or SSI, for disabled people according to the applicant's income, assets and living arrangements and a maximum benefit amount that changes yearly based on the consumer price index, reports the Social Security Administration. Additionally, some states add monthly supplemental SSI payments to the federal benefit.
To be eligible for SSI on the basis of disability, applicants must meet the disability requirements and have income and assets below the maximum allowed limits, explains the Social Security Administration. If they live on their own, with their spouse and minor children or with others to whom they pay full room and board, they can receive the full maximum amount of monthly SSI benefits. However, if others help them regularly with food, shelter or utilities, known as in-kind support and maintenance, the Social Security Administration deducts a portion of their monthly SSI benefit based on the amount of help they receive.
The maximum SSI benefit amount for an individual disabled adult or child is $733 per month as of 2015, states the Social Security Administration. The maximum amount for a couple is $1,100. Some states do not offer an SSI supplement. Others offer supplements administered by Social Security, and some states have state programs that offer their own SSI benefit payments in addition to those provided by the federal government.