This document contains final regulations relating to the application of the effective date rules of the generation-skipping transfer (GST) tax imposed under chapter 13 of the Internal Revenue Code (Code). These regulations provide guidance with respect to the type of trust modifications that will not affect the exempt status of a trust. In addition, these regulations clarify the application of the effective date rules in the case of property transferred pursuant to the exercise of a general power of appointment. These regulations are necessary to provide guidance to taxpayers so that they may properly determine if chapter 13 of the Code is applicable to a particular trust.