Description: Understanding the Deferred Acquisition Cost (DAC) asset balance movements from one reporting period to the next can be a challenge when reportinged under FAS 97. The mechanics of FAS 97 call for an amortization ratio (i.e., k factor) that forces the amortization of the DAC asset to be matched to the earnings received over the life of the product. However, the fact that the k factor is dynamically set results in “unlocking” components of the DAC rollforward. This article shows how the basic equation for the amortization ratio can be used to derive equations that provide insights into what the DAC balance represents. Furthermore, partial derivatives of these equations are used to show how unexpected changes in the Estimated Gross Profit (EGP) stream impact the amortization and unlocking components of the DAC rollforward.