I rented a car for 4 months and paid $4,000. I used it 90% for business. How do I

write it off on my taxes? I could not get a car loan because my credit was so bad yet I have a business that generates good monthly income if I am able to move around. I rented a car for 4 months and paid $4,000. My plan was to have a car, not worry about maintenance and be able to write off the rental on my taxes. I used the car for 80% to 90% business and the rest personal use. Can I write off the monthly payment to the rental company? Can I write off mileage?