(a) in the case of a person or firm holding appointment as auditor of a number of companies each of which has a paid-up share capital of less than rupees twenty-five lakh, twenty such companies;
(b) in any other case twenty companies, out of which not more than ten shall be companies each of which has a paid-up share capital of rupees twenty-five lakh or more.
ICAI Also Said That Private Companies also included in Above Limit But Co act Given Exemption DFor it.