Billing system is widely used along with erp has a business grows at high rate more functionalities as to be added to keep pace with the current technologies to achieve more efficiency. this system is created using modular approach so further updating in number of functionalities can be easily done based on companies requirement. main modules are product management, inventory, invoice, employee management, payroll, customer management, etc. admin panel helps to generate the custom reports and even header-footer of the invoice can be regenerated as per the needs of company. this system comes with two version, first i.e. online billing erp which consist all main modules along with email integration for store / malls and facility of viewing bills from remote place for customers. second i.e. billing erp with raspberry pi which works as isolated system where internet connectivity is not available but this system lacks by two functionalities which is available in first version remaining are common.