POS machines are crucial in the diverse scenarios of the government's tax-controlled ticketing system, and are widely used in the daily operations of retail, restaurant, supermarket and other sales tax-paying merchants. When consumers make payments, POS machines can not only complete the payment quickly, but also issue tax-compliant invoices in real time. This not only enhances the shopping experience of consumers, but also facilitates the financial management and tax declaration of merchants. Through real-time monitoring of POS data, the tax department can accurately grasp the details of merchant transactions, ensure that merchants pay taxes in full and on time, effectively prevent tax evasion and avoidance, make tax collection and management more transparent and fair, and create a healthy market environment. In addition, in consumer or tax disputes, the invoices issued by POS machines are the key documents, which can strongly protect the legitimate rights and interests of consumers and merchants. In short, in the government tax control, ticketing and other scenarios, POS machines, by virtue of their own functions, are of great significance in enhancing the efficiency of tax collection and management, guaranteeing tax fairness and maintaining economic order, and are a key part of the modern tax management system.