My understanding is that disability earned income is handled differently in different places, so that you need to check with your local folks, if you have not done so already, to make sure you don't jeopardize your eligibility.
I claim as Schedule C income every penny that is paid to me--whether it is fee, bonus, reimbursement or some kind of mileage reimbursement (rare--usually just called a bonus). From that I then can deduct my business expenses--IRS mileage at the rate allowable for that year; equipment that is purchased for use for MS (camera, computer, voice recorder, etc.), supplies purchased for MS use (paper, folios, printer ink, pens, etc.), the amount I spent and was reimbursed for during the year, and certain unreimbursed expenses (on a flat fee shop where you are required to make a purchase but not reimbursed separately, that expenditure is an 'unreimbursed expense'). Generally if your net income after appropriate deductions is under $400 you will not need to pay self employment tax. The net income then transfers to the front page of your 1040 tax return and you proceed with the rest of your return.