Insurance companies work with different statistics and use different methods to calculate premiums. Some companies are specialized in certain areas or types and so are prepared to give discounts in those areas. This adds to the complexity as various companies yield varied prices.

Premiums are quoted based on the risk being insured. The greater the risk, the higher the premium quoted. Hence, depending on the cover being provided, different insurers may assess the same risk differently and thus the differences in premiums between different insurance companies. Insurance premiums are also computed on basic, with Loadings and discounts. Premiums are likely to be the same for classes of business subject to Tariffs.