As it stands, Income reporting via the iphone app doesn't seem to work if you are a Representative Payee for SSI. Only way for me to report income is the slow and cumbersome process of calling the national number, Going to local office, or mailing it in. This makes things very difficult.
SSA recently releases a report that provides good information on Surveys for Race Data on OASDI and SSI Programs: A Comparison of Four Major Surveys. You can review it at: https://www.ssa.gov/policy/docs/rsnotes/rsn2016-01.html.
Researchers may access the four surveys discussed in the report directly via their public-use micro datasets available on their respective websites.