Sir,
According to Section 10 (1) of CGST Act, 2017 "notwithstanding anything to the contrary contained in this Act but subject to the provisions of sub-sections (3) and (4) of section 9, a registered person, whose aggregate turnover in the preceding financial year did not exceed fifty lakh rupees, may opt to pay, [in lieu of the tax payable by him under sub-section (1) of section 9, an amount of tax calculated at such rate] as may be prescribed, but not exceeding, -
(a) one per cent. of the turnover in State or turnover in Union territory in case of a manufacturer,
(b) two and a half per cent. of the turnover in State or turnover in Union territory in case of persons engaged in making supplies referred to in clause (b) of paragraph 6 of Schedule II, and
(c) half per cent. of the turnover in State or turnover in Union territory in case of other suppliers,
subject to such conditions and restrictions as may be prescribed :
Provided that the Government may, by notification, increase the said limit of fifty lakh rupees to such higher amount, not exceeding [one crore and fifty lakh rupees], as may be recommended by the Council.
[Provided further that a person who opts to pay tax under clause (a) or clause (b) or clause (c) may supply services (other than those referred to in clause (b) of paragraph 6 of Schedule II), of value not exceeding ten per cent. of turnover in a State or Union territory in the preceding financial year or five lakh rupees, whichever is higher.]"
In view of this provision if a supplier makes supply of both goods and services under composition scheme, he can make supply of service upto 10% of the turnover (of what turnover of goods or turnover of both goods and services-not clear from the wordings employed by the legislature) during previous financial year. As the things stand as of noe the turnover is of both goods and services.