Fiduciaries need to properly account for an estate or trust, which can be a complex undertaking. It is governed by the rules of the applicable will or trust agreement, as well as the guidelines stated in the Uniform Principal and Income Act. In the Fiduciary Accounting manual, we discuss the nature of income and principal, as well as the many rules for allocating receipts and disbursements to them. The manual also addresses the rules governing transfers between income and principal, the total return concept, the handling of administration charges, fiduciary accounting schedules, and much more.