It is subject to individual lender requirements and their assessment of your loan application but in most cases, the car loan can cover the full purchase price of the car. Some dealers may advertise this as no deposit finance. Lenders usually only request a larger deposit be paid for some new and used cars and/or based on individual risk assessment. If you do choose to pay a deposit to the seller, this will reduce your total loan amount (compared with borrowing 100% of the purchase price) and as such reduce your monthly repayments.