Itr 3 to itr 4 44ad presumptive income how?

Hello CAclubindia Team, 

I used to file ITR 3 every year for my business every year with Maintaining book of accounts (No audits because of less than 20 lakh)

It's almost 4 years with ITR 3 with PROFIT & LOSS and Balance sheet. NOW if I file my tax UNDER ITR 4 44AD presumptive income 6%(Digital), It will affect or I will get notice from income tax dept. for changing and not paying taxes because in this section there is no tax upto 45L (6% digital)

what do you say?