Dunning letters are formal communications sent by a company to its customers to remind them of overdue payments. They are a key part of the Order to Cash (O2C) process, specifically under Accounts Receivable management, aimed at ensuring timely collection of outstanding invoices. The primary purpose of a dunning letter is to prompt the customer to settle their unpaid balances while maintaining a professional relationship. Effective dunning practices help reduce bad debts, improve cash flow, and maintain accurate financial records. Dunning letters typically follow a structured escalation process, starting with a polite reminder and progressively becoming firmer if payment is not received. This process can vary depending on the company’s credit policies, the amount overdue, and the duration of the delay. The first dunning letter is usually courteous and informative, providing details of the overdue invoice and a request for prompt payment. Subsequent letters may include warnings about penalties, interest charges, or suspension of services if the payment is not made. The final dunning communication may involve legal action or handover to a collection agency. A standard format of a dunning