Deemed commencement date for specified amendment provisions gives retrospective effect to sections of the GST Amendment Act. Appoints 30 June 2020 as the deemed commencement date for sections 2 and 13 of the Madhya Pradesh Goods and Services Tax (Amendment) Act, 2020, by notification issued under the powers of sub section (2) of section 1, thereby treating those provisions as having come into force on that earlier date.