Professional fee above 20,00,000

I am a doctor and running a clinic and work in private hospital i have received Rs.18,00,000/- from private clinic along with TDS and Rs.12,00,000/- as cash from a clinc and total turnover passes Rs. 30,00,000/- can i file my IT Accounts in ITR -4 and goes in 50% Professional Tax Us 44ADA and pay the tax ( I want to know whether professional fee above 20,00,000/- any tax will avail )