A common sales measure technique used by insurance companies in the United Kingdom where the sales of a given entity are estimated by taking the value of regular premiums, plus 10% of any new single premiums written for the fiscal year. The premiums earned by a firm can be extended to include all revenues of a given firm.




Taobiz explains Annual Premium Equivalent - APE
When estimating any future metric, it is important to consider any unforeseen events, and how these events may impact your estimate. For example, when forecasting a firm's sales revenues, you would want to consider the competition and what there product lines and pricing strategy will be over the forecasting period.

This will allow you to fine-tune your estimate, which will hopefully be more applicable, and provide you with a margin of safety.