Social Security Disability Income is generally referred to as SSDI. The Supplemental Security Income is referred to as SSI. They are both parts of a larger Social Security program, which provides benefits to disabled individuals, assuming they meet certain criteria. The difference is that SSDI, the regular Social Security most people are familiar with, is predicated upon contributions made by a person who’s making an application during their working life. If they haven’t contributed into the system, they’re not going to get SSDI, even if they’re disabled. SSI is commonly known as welfare, meaning that there are asset limitations. You still have to be disabled, but it has nothing to do with what you’ve paid into the system. Therefore, SSI only pays $733 per month, and it comes with Medicaid. SSD comes with Medicare, and pays substantially more money.