what is not a deductible business expense 
any expense that has a personal benefit rather than a business benefit is non deductible granted this can be a gray area if you go to los angeles for business purposes and spend a day at disneyland while there your tickets to the park are not deductible your flight to and from l a should be deductible as long as you re ready to prove that you spent most of your time there doing business can i deduct my car if i use it for my llc if you use a car entirely for business purposes you can deduct the related expenses if you have a car that you use for both business and personal trips only the costs related to its business use are deductible that means keeping receipts and a careful log of mileage and other costs associated with the vehicle 9the bottom linethe key to business tax reporting is ordinary and necessary expenses that s the phrase the irs uses to describe the costs of doing business those costs are deducted from income in order to arrive at taxable income for the period being reported 