In Massachusetts, it is required by law to have car insurance before you can register your newly purchased vehicle. This means that you need to get insurance coverage immediately after buying a car. It is illegal to drive without insurance in Massachusetts, even if you have just bought the car and haven't registered it yet. Additionally, most car dealerships will require proof of insurance before they allow you to drive the car off the lot. It's always a good idea to shop around and compare quotes from different insurance companies to get the best coverage at the most affordable price. Remember, driving without insurance can result in fines, license suspension, and other serious consequences, so it's important to get insured as soon as possible after buying a car in Massachusetts.