A loan request letter can help your small business secure crucial funding. Here are samples, templates and tips on how to write a good one.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. "Explore the parameters of a business loan with our comprehensive document detailing its terms and conditions. Business loan agreement late payment fee. An example of where to include late payment fees in a business loan agreement. Letter templates for self-employed, contractors and business owners. Related: Guide to Thank You Notes. Reporting company to identify you.