The only way to be certain that you are claiming the correct mileage is by keeping very careful records. There are many ways you can track your mileage as trips. It can be as simple as a mileage log book, which can be purchased at any office supply store, or as intricate as an Excel database that sums up the total mileage via a formula. Whichever method you choose, you'll want to track the following:
- Purpose of the trip.
- Starting mileage
- Ending mileage
- Number of miles traveled
- Were all the miles for the charity work, or was any percentage personal business? Watch this, because if too much of the trip was for personal reasons, you may not be able to claim the trip at all.
Finally, if you can document the purpose of the trip through any type of paperwork, be sure to keep that on file. For example, if you attend a youth retreat camp and pay for your own stay there, you'll want to keep a receipt. Even if you are reimbursed by the church for the actual stay, ask for a copy of the receipt and make a note that you are not claiming the retreat itself, but simply using the receipt as documentation that this was the purpose of the trip. Also remember that you cannot double dip. If the church reimburses you for mileage, you cannot take a mileage deduction on your taxes.