What is Tax Audit ?

According to section 44 AB of Income Tax Act 1961  Tax audit mean  compulsory audit under Income Tax Act who

1.carrying on business if the total turnover exceed Rs.1 Crore during the previous year relevant to assessment year

2.carrying on profession if the total turnover exceed Rs.50 Lakhs during the previous year relevant to assessment year.

3.carrying on business  and covered under section 44 AE or 44BBB and  he has claimed his income lower than the profit according to  deemed profit and gain section.

4. carrying on business and covered under section 44AD