Yes, it can be very confusing. In my opinion, and that is all it is, my opinion, nothing more, and may not be correct, but I think your SSDI will be unaffected by earning between $400 and $500 per month when possible. I am referring ONLY to social security DISABILITY and NOT to supplemental which has different monetary amounts, limits, inclusions, etc.

I do think that if you were going to be earning more, but still under the $770 limit, it might raise some eyebrows and they may think you are purposely holding your income down. Let's say you were earning $700 per month. That might appear to be an intentional "stay below the limit" earning.

As I said, it is only MY opinion, but I think your earnings of $400 - $500 will not jeopardize your SS disability. They may also look at the number of hours you are working per week to see if you still qualify as disabled.

Hope this helps some.