Start the body of your letter with a brief summary of why you're writing it and the amount of money you'd like to borrow. In this article, we discuss how to write a loan request letter, review its elements and go through a sample letter to help you write yours.This document not only serves as proof of approval but also outlines essential details such as the loan amount, interest rate, and repayment schedule. Writing a business loan request letter isn't as simple as it may seem. Here's a guide on how to write a request letter for a business loan! For other questions you may have, please contact the Office of the Tax Assessor-Collector at 210-335-2251 for personalized assistance.