Supplemental Security Income (SSI) is a need-based program, allowing those have little or no income, and who are blind, eldery or disabled to receive benefit payments to cover basic costs for food, shelter and clothing. The Social Security Administration (SSA) administers this program.  SSI pays monthly benefits to people with limited income and resources who are disabled, blind, or age 65 or older.  Blind or disabled children, as well as adults, can get SSI.  Benefits are paid monthly, on the first of the month.

Some people are eligible to receive SSI benefits and Social Security Disability Insurance benefits (also called "SSD", "SSDII", "disability benefits", or "Social Security Benefits") at the same time.  In fact, whenever someone applies for SSI, they are also automatically considered to be applying for disability benefits.

While Social Security Disability benefits are based on your previous work history, SSI benefits are only based on your need.

In many states, once it is established that you are entitled to SSI, then Medicaid will begin to pay for your doctor bills, prescription drugs and other health and medical expenses.  You may also be entitled to food stamps (not in California, however).  In many states, when you apply for SSI, you are also automatically signed up for the food assistance program.

To be eligible to receive SSI you must be a resident of the United States, and once you have filed for benefits, you can't leave the country for a period of longer than 30 days.  All U.S. citizens, all U.S. nationals, and some categories of non-citizens may apply.