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📋 '''Pro rata premium''' is the portion of an [[Definition:Insurance policy | insurance policy's]] total [[Definition:Premium | premium]] that corresponds to the exact fraction of the policy period during which coverage was in effect. When a policy is cancelled, endorsed, or adjusted mid-term, the pro rata calculation divides the annual (or term) premium by the number of days in the full policy period and multiplies by the number of days coverage actually applied, producing a mathematically proportional charge. This stands in contrast to [[Definition:Short rate cancellation | short-rate]] methods, which impose a penalty or minimum retention for early cancellation, and to [[Definition:Flat cancellation | flat cancellations]], where coverage is treated as though it never incepted.

⚙️ Consider a twelve-month [[Definition:Commercial property insurance | commercial property]] policy with an annual premium of $12,000. If the insured cancels after exactly six months and the policy allows pro rata cancellation, the insurer retains $6,000 — precisely half — and refunds the remaining $6,000. The same principle applies when coverage is added mid-term: if an insured adds a new location or increases [[Definition:Limit of liability | limits]] seven months into the policy, the additional premium is calculated on a pro rata basis for the remaining five months. In [[Definition:Reinsurance | reinsurance]], pro rata premium calculations are integral to [[Definition:Quota share | quota share]] and [[Definition:Surplus share | surplus share]] treaties, where the reinsurer's share of premium corresponds proportionally to its share of risk. Across jurisdictions, whether an insured is entitled to a pro rata refund upon cancellation depends on local regulation and policy terms: many U.S. states mandate pro rata return of [[Definition:Unearned premium | unearned premium]] when the insurer initiates cancellation, while other markets — such as certain [[Definition:Lloyd's | Lloyd's]] placements — may contractually specify alternative methods.

💡 Pro rata premium calculations matter because they sit at the intersection of fairness, cash flow, and operational efficiency. Policyholders reasonably expect to pay only for the period they are covered, and regulators in most developed insurance markets enforce that expectation, at least when cancellation is initiated by the insurer. For carriers, the distinction between pro rata and short-rate cancellation has real financial impact: short-rate provisions help recover fixed [[Definition:Acquisition cost | acquisition costs]] that are front-loaded at policy inception, whereas pro rata returns pass the full unused premium back to the customer. [[Definition:Policy administration system | Policy administration systems]] automate these computations, but complexity increases with installment billing, mid-term endorsements, and multi-currency placements in global programs. In [[Definition:Insurtech | insurtech]] and [[Definition:Usage-based insurance (UBI) | usage-based insurance]] models — where coverage may activate and deactivate in near real time — pro rata logic is embedded at the core of the billing engine, ensuring that [[Definition:Premium | premium]] charges remain precisely aligned with active coverage periods.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Short rate cancellation]]
* [[Definition:Unearned premium]]
* [[Definition:Earned premium]]
* [[Definition:Mid-term adjustment]]
* [[Definition:Flat cancellation]]
* [[Definition:Return premium]]
{{Div col end}}

Definition:Pro rata premium - Revision history

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