No matter which way you plan to deduct your business expenses related to your vehicle, the fact is that you need records to help you. First, keep a log of when you use the vehicle for business especially if it is not used solely for business. Keep a notebook in your glove box to help here. You are not required by current tax code to have this log specifically, but you must show how and when the vehicle is being used.

Also, keep all of your receipts in one location for your vehicle. This includes gas receipts, repair receipts, insurance, and other investments that keep your vehicle running for your business. You can also keep this information recorded in a planner. This will allow you to keep all of your vehicle related costs in one location. If you use a credit card to pump gas into your vehicle, keep those statements and be sure that you know how much went towards business.