Yes, I was under the same impression that persons covered under 44AD(6) cannot claim presumptive taxation under 44AD. But recently in a conference the point was discussed by few professionals having most of their clients as wholeselers having commission income, which is summarized as follows:
1. The question doesn't arise when the assessee has only single income from 'commission or Brokerage' or 'agency'.
2. When an assessee has one such income alongwith another income (eligible for section 44AD, as in the query), the question arises whether the business or the assessee as a whole is ineligible?
3. Plain reading debars assessee as a whole, but its interpretation by department as per its tutorial is just opposite:
" Presumptive Taxation Scheme of Section 44AD
For whom the presumptive taxation scheme of section 44AD is designed?
The presumptive taxation scheme of section 44AD is designed to give relief to small taxpayers engaged in any business (except the business of plying, hiring or leasing of goods carriages referred to in section 44AE).
The presumptive taxation scheme of section 44AD can be adopted by following persons :
1) Resident Individual
2) Resident Hindu Undivided Family
3) Resident Partnership Firm (not Limited Liability Partnership Firm)
In other words, the scheme cannot be adopted by a non-resident and by any person other than an individual, a HUF or a partnership firm (not Limited Liability Partnership Firm).
This scheme cannot be adopted by a person who has made any claim towards deductions under section 10A/10AA/10B/10BA or under sections 80HH to 80RRB in the relevant year.
Businesses not covered under the presumptive taxation scheme of section 44AD
The scheme of section 44AD is designed to give relief to small taxpayers engaged in any business, except the following businesses:
Business of plying, hiring or leasing of goods carriages referred to in section 44AE.
A person who is carrying on any agency business.
A person who is earning income in the nature of commission or brokerage
Apart from above discussed businesses, a person carrying on profession as referred to in section 44AA(1)is not eligible for presumptive taxation scheme.
Extract from TAX ON PRESUMPTIVE BASIS IN CASE OF CERTAIN ELIGIBLE BUSINESSES OR PROFESSIONS [As amended by Finance Act, 2017].
4. Secondly, most of these assesseess are regularly filing ITR3 (or its equivaqlent ITR4 in earlier years) well-developed by ITD (downloaded from its official efilling site) for declaring trading business income under presumptive scheme alongwith 'commission income' under regular assessment; which is accepted by department even while regular assessment........