How To Write A Loan Proposal Letter . The letter should follow a traditional format and include the names and. We are asking [lender.company] for a loan of $125,000 to be repaid over one year at a rate of 6% interest, making payments of $11,041.67 monthly. Sample Loan Application Letters 17+ Free Sample, Example Format from www.template.net Write in a pleasing and formal format. List your business address and phone numbers. State your purpose for the proposal.