Invalid invoices refer to an invoice that cannot be accepted by the payee due to various reasons such as incorrect information, invalid data, incomplete details and other discrepancies. A business must ensure that the invoices it issues are valid in order to avoid delaying payments and other transactional complications. Additionally, businesses should ensure that any invoices they receive contain accurate information, otherwise they could be liable for inaccurate payment or can miss out on potential revenue. It is therefore essential for all businesses to thoroughly check the validity of their invoices before sending them out.