Quickly learn what a Letter of Instruction is and how to write one (2024 updated). Plus, grab the free template so you can take action!A letter of instruction is a cheat sheet for anyone involved in settling your affairs. Unlike a will, this letter has no legal authority. In this blog post, we'll delve into what a letter of instruction is, why it's essential, and how to craft one with finesse and ease. Complete List of Your Assets. A letter of instruction is a nonlegal document where you express your final wishes in clear language. It differs from a legally binding will. Fill out and submit the form according to your bank's instructions. Advertisement. Your estate plan is not complete just because you signed some fancy papers.