California Mileage Reimbursement Law requires employers to reimburse employees for all vehicle expenses incurred on the job. Under Section 2082 in California, employers have essential obligations to fulfill when employees use personal vehicles for work.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. This law states that employers should reimburse employees for each and every expense that they incur throughout the course of doing business. Mileage reimbursement in California is meant to cover all costs of owning and operating a personal vehicle for the business portion of its use. In California, employers are required to fully reimburse you when you use your personal vehicles for business purposes. But in an employee-friendly state like California, employers must reimburse employees for all reasonable time spent driving outside of their commute. Under California law, commuting time to and from work normally does not constitute "hours worked" and is not compensable.