The Department of Treasury (Treasury) dates monthly SSI checks for the first day of
the month. For dates falling on Saturdays, Sundays, or Federal holidays, Treasury
dates the SSI check for the business day immediately preceding the 1st. For example, the SSI check payment date for May 1, 2016, fell on a Sunday, so the
payment date for the May 2016 SSI check was April 29, 2016.