For every claim free year, the insured is rewarded with a discount on the renewal premium. This discount is called - No Claim Bonus (NCB). It is cumulative and increases every year. It usually ranges from 10% to 50% and can save a substantial amount of money on the premium payable for your auto insurance. Let's take an example if a policyholder doesn't make a claim during the tenure of his auto insurance policy, he becomes eligible for No Claim Bonus, on the basis of which, a certain rebate is offered on the payable premium.