You should add a new car to your insurance policy as soon as you become the owner or have possession of the vehicle. It’s important to have insurance coverage in place before you start driving the vehicle. When adding a new car to your policy, contact your insurance provider and provide them with the necessary information about the vehicle, such as the make, model, year, and vehicle identification number (VIN). Your insurance provider will then guide you through the process of adding the new car to your policy and adjusting your coverage accordingly.