The darkest legal tint is one of the most popular tinting choices that automotive enthusiasts make. Dark windows not only make a great improvement to the look of your car, but it also maximizing driver and passenger privacy and reducing glare. The darkest legal limit for tinting is based on the state your car is in. As said before, the level of tint allowed for your vehicle is usually different from state to state. So the darkest legal tint that you can get also depends upon the state you want to drive your car in.