No claim bonus is a way of insurance companies motivating you to prudently use your vehicle so that no claims are incurred on the insurance during a policy period. For every claim free year you complete, your No claim Bonus percentage increases in a set pattern. No Claim Bonus can be accumulated over a period of time- usually for the first claim free year, you are awarded 20% discount and it increases up to 50% of premium discount. This premium discount is applicable only on the Own Damages premium portion and not on the Third Party premium.