Employers can require employees to use a personal vehicle for work. And state or county employees who use their own cars to travel for business may be able to receive 67¢ per mile.It is lawful for your employer to make you use your own vehicle to drive to various locations for your job. The use of privately-owned automobiles for approved work is permissible provided it is done during the course of the employee's scheduled hours of work. Under Section 2082 in California, employers have essential obligations to fulfill when employees use personal vehicles for work. Although it appears to be harmless, allowing company vehicles to be used for personal use opens up your business to a significant amount of legal risk. California Mileage Reimbursement Law requires employers to reimburse employees for all vehicle expenses incurred on the job. The famously regulationfriendly state has enshrined the right to a car allowance (or equivalent) in its labor code.