Which itr to be file

I think ITR 1

USE ITR 1 to file the return

In my view, ITR 1 to be used.

If commission is received from same employer than it will be treated as part of salary and ITR-1 will be applicable. If Commission received from other than employer than it will be treated as business income and ITR-4 or 4S will be applicable subject to maintainence of account books. 

I agree with the view of CA Sonali.