Business Expense Log 2010 Author:CCH Tax Law Editors Anyone who uses a car, travels away from home, entertains, or makes a gift for business reasons needs to substantiate the expense in order to claim a tax deduction. The CCH Business Expense Log provides a convenient way of meeting the recordkeeping requirements. It makes a great handout and includes: Overview of recordkeeping and basic travel a... more »nd entertainment deduction rules Diary pages for tracking auto mileage and expenses Depreciation deduction for computers Sample filled-in diary expenses« less