What Is Auto Insurance Stacking? 
Stacking is where you take the limits of your uninsured motorist coverage and stack them up . For example you carry 50/100 uninsured motorist limits and are hit by an uninsured motorist and are injured . Your policy would pay up to 50,000 for the injury of each person in your auto up to 100,000 max . Now lets say for example you have two cars on your policy . Of course each car has the same 50/100 limits . With stacking since yourpolicywas covering two cars the limits would be stacked and your now have 100/200 coverage in any auto accident . Stacking is not available in all states and for those states that offer stacking it comes with a premium . 