In the US a typical car allowance is somewhere between $500 and $700 per month, but as described in this article you should base the allowance on the expenses related to business driving, rather than a national estimate.
It depends on your employment contract. If you signed an agreement to use your personal vehicle for work-related tasks, refusing to do so could be a breach of contract. However, if your contract does not require using your personal vehicle, you might have more room to refuse.
Yes, your employer can require you to use your own vehicle, but they have to reimburse you for all costs associated with travel, from tolls to mileage, to increased insurance. Since your employer is only paying mileage one-way, they may (probably are) violating Labor Code section 2802.
FAQ. How much is mileage reimbursement in California? The standard mileage rate set by the IRS, applicable in California, is 67 cents per business mile for 2024. The 2025 mileage rate is 70 cents per business mile.
Examples of business miles include driving to a customer meeting, moving product, or setting up a temporary offsite station. Personal miles include driving to/from work, grocery shopping during lunch, or family outings in the company vehicle.
In short, yes the employer can. In California all employment is considered to be on an at will basis unless there is an agreement to the contrary about that status between the employee and employer.
You can deduct the car expenses as a business expense. If you also use the car for personal use, the value of the personal use has to be added to your W-2 box 1 taxable income because it is a taxable employee benefit. This is still messy, though slightly less messy than leasing the car to yourself.
The use of privately-owned automobiles during scheduled hours of work should be minimized and only used for purposes that cannot be accomplished by other transport means (e.g. shuttle, delivery service, rental car, etc.).
Under IRS general rules, all use of a company car is considered personal use unless the employee documents the business use of the car. Personal use of a company vehicle (PUCC) generally results in taxable wages for the employee. But sorting out the amount to tax can be confusing.