no-claims bonus 
(also no-claims discount)
noun British
A reduction in the premium charged for insurance when no claim has been made during an agreed preceding period.Unlike car insurance, house insurance does not apply no-claims bonuses, therefore making a claim should not affect your premium - unless you go and claim something every week....
- We already have a law for motor insurance, requiring renewal notices and no-claims bonuses to be issued 21 days prior to the renewal date.
- Piggybacking on parents' insurance is another way for teenagers to cut costs, but it can double the parents' premium, and young drivers cannot accrue no-claims bonuses.