Those applying for the Supplemental Security Income program need to fill out an SSI form and file it with the Social Security Administration. An SSI form serves as an initial application for supplemental income and allows the Social Security office to assess an applicant's income and needs.
The SSI form is also known as Form SSA-8000-BK. Most of its 65 questions are about the applicant's income and assets, but the form also has sections dedicated to determining the applicant's citizenship status and the number of dependents for which he is responsible. The form may be filed with a Disability Report and any other documents needed to determine whether the applicant qualifies for disability insurance.