Presumptive taxation can applies to any business whose Sales Value is less than Rs. 2 Crores per annum.

Businesses having annual turnover under Rs. 2cr and declaring income above 8%(no audit)

Any other person having casual income.

Section 44AD is only applicable for 

1. 1. Individuals i.e. Proprietor/ Proprietorship Firm 
   2. Hindu Undivided Family (HUF) 
   3. Partnership Firm 

not applicable for any form of entity like Company, LLP etc

only applicable for Resident Indians and not for Non-Resident Indians (NRI’s).

Section 44AD is not applicable to:

Any person who is carrying on any business as an agent. 

Any person who is earning Income in the nature of Commission or Brokerage 

Insurance Agents cannot adopt the Presumptive Taxation Scheme as they earn Income from Commission. 

You cannot claim separate deduction for expenses. 

Separate deduction on account of depreciation is also not available.. Even the Salary/Remuneration/ Interest paid to Partners will not be allowed as a deduction