This document addresses joint interest accounting issues related to regulations implemented by the Bureau of Safety and Environmental Enforcement (BSEE) in 2011. These regulations require operators drilling in the deepwater Gulf of Mexico to secure and have available, on standby, well containment equipment. Two companies currently provide the necessary well containment equipment and services and charge fees based upon different ownership and pricing structures. This document provides guidance as to how and when these costs can be charged to the joint account. September 2013. 32 pages.