Yes, Budget 2016 enable Professionals to offer for Presumptive Income u/s.44ADA @ 50% of Gross Receipts as Presumptive Income
The definition of Gross Total Receipts may include Service tax you collected from clients. Generally it depends upon the way you treat Service tax in your books of account. If you make entry in your books of account as Cash a/c Dr To Service Fee, To Service tax Payable then the definition of Gross receipts does not include Service tax and if entry is Cash a/c Dr To Service Fee, To Service tax (Grouping Under Income) then You have to consider Service tax for Gross Receipts Purpose. In my opinion, Contention of Not to include Service tax may not be supported by Assessing officer. A.O may link it to Section 145A (even it relates to Purchase,Sale and Closing Stock Valuation for tax purposes) saying that as per Section 145A, Purchase, Sale and Closing stock for Tax purposes shall include all taxes irrespective of fact that you can later avail Tax paid on Inputs can be availed as Cenvat Credit.