Invoices are an essential tool for self-employed individuals to manage their finances and maintain a professional image. By understanding what an invoice is and how to create one, self-employed individuals can effectively track their income, manage expenses, and ensure they comply with legal requirements. This article will provide a comprehensive guide on invoicing for self-employed individuals, covering the definition of an invoice, its basic elements, different types of invoices, the importance of invoicing, how to create an invoice, legal requirements for invoicing, and common invoicing mistakes to avoid.