A car loan will not affect your current mortgage repayment but will be an additional monthly commitment to make. Before taking a loan, you should ensure you are comfortable that you can afford the repayments for both your mortgage and the loan. If you are planning to take a new mortgage, one of the factors a lender will consider is your existing level of debt and recency of credit taken when determining if you can afford the mortgage repayments. You may wish to seek advice from a qualified mortgage advisor.