Query

Eligible assessee for the purpose of Section 44AD means an individual, HUF or a partnership firm, who is a resident, but not an LLP. 

Turnover from eligible business should not exceed 2 crore rupees (wef AY 17-18). Eligible business here means any business except the business of plying, hiring or leasing goods carriages (Sec 44AE).

The provisions of Section 44AD shall not apply to:

a)  a person carrying on profession u/s 44AA

(b)  a person earning income in the nature of commission or brokerage; or

(c) a person carrying on any agency business.

So in simple terms, any person who fulfis the above conditions can opt for Section 44AD.