The letter of last instruction is a letter detailing certain instructions not found in other estate planning documents. A letter of instruction is a document that guides a designated individual or entity on how to carry out specific actions or wishes after the author's demise.As you can see, the bank letter example above has all of the required components (date, name of bank, account name, account number, routing number). This distribution is intended to be an IRA Charitable. Write to Refund Desk,. Arizona Department of Revenue, PO Box 29216, Phoenix, AZ. 85038-9216. You may request funding for completing the legal entity in your cover letter. If you are registering a Foreign Series. LLC. Common reasons for needing a medallion signature guarantee.