1) How do I account for trading related materials, books, VHS etc that I buy from eBay, Amazon.com? etc? I know I can expense it when I incur the expense. But, what happens when I decide to sell them back? do I need to take an account of that? because who is going to know I sold it back or not? and what if I kept it for one year before I sell them back. 2) Electric Bill? I use 3/5 ths of my apartment as an office. Thus, I think I should write 3/5 ths of my $150 electric bill as a cost of doing business. Or maybe it should be more since I have 3 comps running, with 6 screens and a TV. I think I should write off the whole electric bill.