Retrospectively rated insurance is a method of establishing a premium on large commercial accounts. The final premium is based on the insured's actual loss experience during the policy term, sometimes subject to a minimum and maximum premium, with the final premium determined by a formula. Under this plan, the current year's premium is based partially (or wholly) on the current year's losses, although the premium adjustments may take months or years beyond the current year's expiration date. The rating formula is guaranteed in the insurance contract. Formula: retrospective premium = converted loss + basic premium × tax multiplier. Numerous variations of this formula have been developed and are in use.
In the United Kingdom, The Crown (which, for practical purposes, meant the civil service) did not insure property such as government buildings. If a government building was damaged, the cost of repair would be met from public funds because, in the long run, this was cheaper than paying insurance premiums. Since many UK government buildings have been sold to property companies and rented back, this arrangement is now less common and may have disappeared altogether.
The cost of insurance is on the rise: the price for auto insurance rose 3.6% between 2011 and 2012, and 3.1% for homeowners and renter’s insurance, according to the Insurance Information Institute. In fact, auto liability insurance premiums alone have been increasing by 2.8% annually for the past three years. This makes choosing the right coverage and provider all the more crucial to save money without sacrificing important aspects of coverage.