Many Americans who desperately need some additional financial support do not understand how to apply for SSI, or Supplemental Security Income. The application process can be tedious and involve several steps, so it is important to talk to a legal expert before beginning the application. Individuals or families wishing to claim benefits can fill out the majority of the application online or can even set up an appointment with a Social Security representative from a local SSA office. Individuals should bring the following items when applying social security card, birth certificate, information about your home- such as a mortgage or a lease, payroll slips, bank books, insurance policies, contact information for doctors if blind or disabled and proof of U.S. citizenship or eligible noncitizen status.