º Each person in your case must file a completed Financial Statement within 45 days after the Plaintiff delivers the Complaint to the Defendant. (Note to Bank: This letter of credit must be issued on bank letterhead and the bank must be chartered within the Commonwealth of Massachusetts.A bank letter is an official document from your bank that provides important information about your business' official bank account. Learn how to fill out a Financial Statement Form, which you need for many types of cases in Massachusetts Probate and Family Court. A letter of instruction is a cheat sheet for anyone involved in settling your affairs. Unlike a will, this letter has no legal authority. Fill out all relevant fields in Form MPC 850, take a break, and then review. Step 2 - Complete the Document. Fill out all relevant fields in Form MPC 850, take a break, and then review. How to fill out the Massachusetts Statement of Account Form Guidance?