K S Aiyar & Co. is the oldest chartered accountancy firm in India, established in 1897 by Kalyan Subramani Aiyar in Calicut and later moving to Mumbai. Known as the "Father of Accountancy" in India, Aiyar made significant contributions to the profession. The firm has a rich legacy and has played a vital role in shaping the accounting landscape in the country. The firm offers a comprehensive range of professional services, including independent audit and assurance, tax consultancy, management consulting, and legal support. They also provide services in areas such as foreign exchange consulting, restructuring, and personnel recruitment. K S Aiyar & Co. has served a diverse clientele, including notable groups and banks, and continues to influence the accounting industry by setting high standards for financial reporting and auditing practices.