This document provides tips for collecting debts from overdue customers. It recommends (1) charging late fees to deter late payments and send a message about firm credit policies, (2) taking immediate action when payment is due by contacting the customer to understand non-payment, and (3) being firm but friendly to build rapport and find mutually agreeable solutions rather than antagonizing debtors. It also stresses the importance of persistence through regular contact, coming prepared with information about the customer's account, using phone calls as the primary collection method, and listening to understand reasons for non-payment in order to work towards a resolution.