Yikes...you all are blowing my mind with your complex Excel Sheets.....
Since I only shop on a very part time basis, I have one simple Excel sheet....MS Company, Assignment, address, amount reimbursed, fee, Paid, Parking tolls, and date paid. Figured since I started doing the airport circuits that I needed to get a bit more organized with my income.
Since I don't do routes, I can figure out my mileage from the addresses I have and go from there.
Each page of the file is a new month and I try and total everything per month then per quarter.
FWIW, for those that don't want to spend the $$ for MS Office, I downloaded a free Office clone called Libre Office. Its very easy to save in MS Excel format if you need to.
Silver certified (since 2009) and willing to do shops all around the greater Chicago, NW Indiana, and Southern Wisconsin areas (including airports!.