Originally Posted by Janke

There is a form, a work activity report (SSA 821) that asks all the questions including questions about accomodations, that you need to provide to SSA. If you haven't already reported your wages, you need to do so. That form plus the pay stubs should be sufficient proof of what you say, that the work is not SGA.

I assume that some day you do intend to work so it is important that you understand work incentives and reporting responsibilities.