Section 44AD in Income tax act is the presumptive income section under which prescribed percentage of turnover will be deemed as your income. Till AY 2016-17, prescribed percentage was 8%.
According to section 36(1)(iv) any sum paid by the assessee as an employer by way of contribution towards a recognized provident fund shall be allowed as a deduction in computing the income referred to in section 28 (income under PGBP).
The article discusses composition scheme from three views: i) Customer ii) Government iii) Businessmen. The law says that the composition dealer will not be permitted to collect GST. Further, there is a anti-profiteering clause under GST which states that the benefit of reduction in tax rates under GST should pass on to the customer. In composition scheme, the dealer is not allowed to collect tax and therefore the benefit should pass to the customer.