Net Premiums Earned is the adjustment of net premiums written for the increase or decrease of the company's liability for unearned premiums during the year. When an insurance company's business increases from year to year, the earned premiums will usually be less than the written premiums. With the increased volume, the premiums are considered fully paid at the inception of the policy so that, at the end of a calendar period, the company must set up premiums representing the unexpired terms of the policies. On a decreasing volume, the reverse is true.