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⚖️ '''Bonus-malus system''' is an experience-rating mechanism widely used in [[Definition:Motor insurance | motor insurance]] that adjusts a [[Definition:Policyholder | policyholder's]] [[Definition:Premium | premium]] upward or downward based on their individual [[Definition:Claims | claims]] history. A claim-free year earns a "bonus" — a discount that lowers the renewal premium — while filing one or more claims triggers a "malus" — a surcharge or loss of discount that raises it. The system creates a direct financial incentive for safe driving and careful [[Definition:Risk management | risk management]], making it one of the most tangible expressions of actuarial [[Definition:Experience rating | experience rating]] that everyday consumers encounter.

🔢 Each insurer or regulatory regime defines a scale of classes or levels, and a policyholder moves along this scale at each renewal. In many European countries — France, Belgium, Germany, and the Netherlands among them — the bonus-malus structure is prescribed or heavily influenced by regulation, with standardized coefficients that all insurers must apply. A French policyholder, for instance, starts at a coefficient of 1.00 and can descend to a floor of 0.50 (a 50% discount) after years of claim-free driving, but a single at-fault claim pushes the coefficient up by 25%. In Asian markets such as South Korea and Japan, similar no-claim discount systems operate, though the specific scales and transition rules differ. The United Kingdom and the United States take a more market-driven approach: UK insurers offer no-claims bonuses (often called no-claims discounts) competitively, and some allow policyholders to purchase [[Definition:No-claims discount protection | no-claims discount protection]], while U.S. carriers embed surcharge schedules into their proprietary [[Definition:Rating algorithm | rating algorithms]] without a uniform national scale.

📊 The bonus-malus system profoundly shapes policyholder behavior and insurer economics. Because a single claim can erase years of accumulated discount, policyholders frequently absorb small losses out of pocket rather than file a claim — a phenomenon that effectively reduces [[Definition:Claims frequency | claims frequency]] and [[Definition:Loss ratio | loss ratios]] for the insurer. [[Definition:Actuary | Actuaries]] incorporate bonus-malus dynamics into their [[Definition:Pricing | pricing]] models, recognizing that the observable distribution of policyholders across bonus-malus classes reveals information about underlying risk that supplements traditional [[Definition:Rating factor | rating factors]] like age, vehicle type, and geography. With the rise of [[Definition:Telematics | telematics]] and [[Definition:Usage-based insurance (UBI) | usage-based insurance]], some industry observers have asked whether granular driving data will eventually supplant the bonus-malus framework, but the system's simplicity, transparency, and deep consumer familiarity ensure it remains a cornerstone of motor insurance pricing worldwide.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Motor insurance]]
* [[Definition:Experience rating]]
* [[Definition:No-claims discount]]
* [[Definition:Telematics]]
* [[Definition:Usage-based insurance (UBI)]]
* [[Definition:Rating factor]]
{{Div col end}}

Definition:Bonus-malus system - Revision history

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