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!This letter (which is not to be construed as my will) is to serve as a reminder of various matters which we have talked about over the years. 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. A Letter of Instruction to Bank is a document that sets out the specific instructions and expectations for how the bank should operate with respect. Contact your bank for a power of attorney form. Irrevocable Letter of Credit. Obtain a letter of credit application from the bank and fill it out with the relevant information.