The party owed should include language that motivates the debtor to make payment. Follow these 10 tips to write overdue payment letters for requesting outstanding payments from your late paying customers.Recovering overdue funds from customers is frustrating. These overdue invoice letter templates show you the right tone and language to use. What should be included in a demand letter? We've created ready-to-use collection letter templates. Read on below to find out what every letter should say in order to collect payment as soon as possible. Most courts even have forms you can fill out to respond to the suit. Here's an example of one of SoloSuit's Answer forms. It includes, for example, both real and personal property held in the decedent's name alone or payable to the decedent or his or her estate.