The Social Security Administration released the SSI benefit amounts for 2018, and they are set to increase $15 for individuals and $22 for families. However, payments vary greatly according to your particular financial situation and location.
SSI is designed for those with limited income and resources and who are / or disabled or blind. No work history is necessary to receive SSI, and the program often coordinates with other state and federal programs for those of limited financial means. That is why SSI payments vary across state lines because whether a particular jurisdiction adds amounts to the federal standard will increase or decrease the available payments.
SSI reduces the amount of your monthly payment by the amount of countable income you have; therefore, the amount you will ultimately receive from SSI is equal to the federal benefit plus any added payment your state might make, reduced by your countable income.