You report the $600 fee as income AND report the $60 expenditure as a cost of doing business. IF the guidelines state that the $60 is reimbursement, instead of stating it as a fee, you technically do not report either; BUT if you feel better, report one as income and the other as expense. However you do it, it is a "wash" as far as affecting your taxable net income on schedule C.
If you are new, it is important to remember that MS income and expenses get reported on Schedule C, with the bottom line from that form then transferred to Form 1040 as Self-employment net income or loss.
If you use Turbo Tax, the instructions will walk you through filling out Schedule C.
Based in MD, near DC
Shopping from the Carolinas to New York
Have video cam; will travel
Poor customer service? Don't get mad; get video.