Sending a past due letter is one thing, but they'll only work effectively if they're designed well enough to catch the recipients attention. Money Owed Demand Letter – Strictly for debts or outstanding balances.As the payment is now overdue, we kindly request your immediate attention to settle the outstanding balance. This article provides a template for a debt settlement proposal letter and explains what a debt settlement letter should contain. Access a free sample of late payment letter template at 360 Legal Forms. Discover free legal forms and printable templates for individuals and businesses. Use our free Unpaid Wages Demand Letter template to inform your employer of outstanding wages. Follow these 10 tips to write overdue payment letters for requesting outstanding payments from your late paying customers. Attach a copy of the invoice. Use our Demand Letter for Payment to demand immediate payment of an overdue loan.