To be honest, I don't know specifically, however, I do know that it is assumed that SSD is not enough to live on, so you are allowed to earn a certain amount over that. Once you reach the ceiling of that, they may subtract an equivalent amount from your SSD - i.e., that say the ceiling is an extra $200 a month, which means they would then subtract $500 from your SSD. However, don't take my word for it, but give your caseworker a call to find out more details. I would also recommend that you check the SSI website and possibly ask another resource, as well, as sometimes, Social Security personnel don't always know the answers and you don't want to risk losing your SSD. If the $700 is way over the allowed amount per month, you may want to talk about the people running the clinical trial to see if they can give you the money over e.g., 10 months instead of three, so that the amount you get each month is within the allowable range. You may also want to check out my post on SSD for links to resources with information about all aspects of applying for SSD and there will probably be information on this issue, as well.

Good luck! If you're up to it, would you be willing to let us know how things go? Earning a bit of extra income while on SSD is an issue that comes up on the site fairly frequently, so sharing your experience would be very helpful to other users in the community.