Statutory Audit of Companies. Tax Audit under Section 44AB of the Income Tax Act, 1961. Audit under other sections of the Income Tax Act, 1961 such as 80HHC, 80-IA, etc. Concurrent Audits Revenue Audit of Banks. Branch Audits of Banks. Audit of PF Trusts, Charitable Trusts, Schools, etc. Audit of Co-operative Societies. Information System Audit. Internal Audits.