I recently filed my taxes for 2015 and this was the first time I've done any moonlighting. I don't think I incurred many business expenses, outside of paying for my medical license, and my controlled substance and DEA registrations. (Compared to these fees, anything else I spent money on was negligible.) On top of my payment for services I was paid a flat rate for travel, so I didn't claim any mileage, though I've heard that I still could. Because I figured any other business expenses were negligible (using my own paper for notes, etc.), I didn't bother trying to add it all up. But since I'm planning on a full year of moonlighting for 2016, I might as well start keeping track of the expenses I can deduct on my taxes for this year. What exactly should I be keeping records of? Also, I plan to interview later this year for my first full time job as an attending. Are there expenses I can deduct when traveling for job interviews?