New York Successor Letters Testamentary are documents issued by the Surrogate's Court of the State of New York to appoint the executor of a will. This document authorizes the executor to administer the estate and manage it according to the instructions set forth in the will. There are two types of New York Successor Letters Testamentary: Regular Letters Testamentary and Ancillary Letters Testamentary. Regular Letters Testamentary are issued by the Surrogate’s Court when the executor is named in the will. Ancillary Letters Testamentary are issued when the executor is a non-resident or unable to act as executor. These documents are issued by the court after the death of the testator and grant the executor the power to handle the estate.