27 July 2016
Ofcourse it can not covered under Salary. Rather you can not cover under income from other sources. you need to file itr 4 to get deduction of expenses.
28 July 2016
Teaching is not a "business" as there is no commerce or trade or manufacturing activity or adventure. Teaching is definitely a profession but it may not be a specified profession u/s 44AA of the Income Tax Act, 1961.