Yes, most auto insurance companies do offer a discount for having a car alarm.  Your auto insurance premium is determined by how much of a risk you are to insure.  Having a car alarm will lower your risk of having your car broken in to or stolen and will also lower your car insurance rate.  You might want to call your insurance company to see how much money you can save every month by getting a car alarm. There are lots of things you can do to lower your risk in the insurance company’s eyes such as drive a vehicle with airbags and anti-lock brakes or take a defensive driving class.  Auto insurance companies offer lots of different discounts, so make sure you ask to see which ones you may qualify for.