I don't know if it is a new rule or whether I just never spotted the info, but for those paying Part B of Medicare, that expense can be deducted as a business expense to your self-employment (i.e. mystery shopping business). I haven't explored it as I am not quite there yet, but I suspect it is deductible against net profits of your business just as currently I deduct my health insurance against those net profits. I would assume the deductibility is whether the Part B is automatically taken out of your SS check or is paid separately.