Defining an Invoice Book. An invoice book is a physical or electronic resource used by businesses to issue invoices to clients and customers. It serves as a written record of a business transaction and helps in maintaining accurate financial records.

* Include a unique bill number, date, and payment due date. * List the items or services provided, along with their quantities, prices, and total amounts. * Calculate the subtotal, taxes (if applicable), and the final total amount due. * Specify payment terms, such as accepted payment methods and payment deadlines.