While there is no single, universally mandated qualification required to become an external auditor, most employers prefer candidates who hold a Certified Public Accountant (CPA) license, as it demonstrates a high level of expertise, ethical standards, and adherence to professional regulations. In many jurisdictions, obtaining a CPA credential is either a legal requirement or strongly recommended for external auditors, especially those working for public accounting firms or auditing publicly traded companies. Additionally, a bachelor's degree in accounting, finance, or a related field, combined with relevant work experience in auditing or accounting, is essential. The CPA designation not only enhances credibility but also ensures that auditors possess the necessary technical knowledge and understanding of complex financial regulations, which are critical for conducting accurate and compliant audits. Therefore, while not always legally mandatory, having a CPA significantly increases an external auditor's qualifications and employability in the field.