The Supplemental Security Income, SSI and Social Security Disability Insurance, SSDI both provide financial assistance to needy individuals. The programs comb through your disability eligibility before granting you one of two or both of the claims under the programs respectively. The programs are run by the Social Security Administration, SSA under the Federal Rule and therefore, the SSA examiners have the authority to cross check your disability severity with your medical practitioner or physicians.
The Social Security Disability, SSDI
The Social Security Disability Insurance, SSDI is an entitlement program hence only individuals who have paid social security taxes on their wages for a minimum period of 40 quarterly financial months are eligible to apply for the SSDI claims. You are eligible to apply for SSDI claims if you earn a less than $1180 for non-blind and $1970 for blind after retirement.
The Supplemental Security Income, SSI
The Supplemental Security Income, SSI on the other hand, is a financial need-based grant of either payment in cash or installments depending on the severity of your disability and your family's financial needs. You cannot be eligible under SSI if you have assets more than $2000 or if you and your spouse's assets exceed beyond $3000.
If you are an individual who qualifies for disability, and also qualifies for SSDI as a regular social security taxpayer on your wages but you have limited or low income at the time of your disability or filing the disability application, then you may get both SSI and SSDI benefits.