A letter of instruction is a cheat sheet for anyone involved in settling your affairs. Unlike a will, this letter has no legal authority.Notify Bank of America. We'll ask you for the deceased customer's full legal name and Social Security number to identify their accounts. The bank will also need to see a copy of the Certificate of Trust naming the successor trustee, and the bank will have some forms that need to be filled out. Online: Use our online form to notify us about a customer's death. A letter of last instruction is a document that outlines funeral planning processes and arrangements. Creating a letter of instruction is an effective way to ensure your intentions are followed. Learn more about letters of instruction here.