Sir,
Section 17 (5) prescribes that "notwithstanding anything contained in sub-section (1) of section 16 and sub-section (1) of section 18, input tax credit shall not be available in respect of the following, namely :-
[(a) motor vehicles for transportation of persons having approved seating capacity of not more than thirteen persons (including the driver), except when they are used for making the following taxable supplies, namely:-
(A) further supply of such motor vehicles; or
(B) transportation of passengers; or
(C) imparting training on driving such motor vehicles
Therefore motor vehicles for transportation of persons having approved seating capacity of not more than thirteen persons (including the driver), is used for further supply of such motor vehicles or transportation of passengers or for in parting training on driving such motor vehicles.
Here the words 'transportation of passengers' require further clarification regarding the input tax credit is available only for public transport companies or for a business entity who runs such vehicles for transporting workers from their home to factory and back. Moreover the business entity operates buses whose seating capacity is more than 13 persons. Normally motor vehicles with seating capacity not exceeding 13 persons is purely for tourist purpose only. May be the amendment benefit only tourism industry and not others.
According to Section 13 (2)CGST Act, 2017 "the time of supply of services shall be the earliest of the following dates, namely :-
(a) the date of issue of invoice by the supplier, if the invoice is issued within the period prescribed under [* * *] section 31 or the date of receipt of payment, whichever is earlier; or
(b) the date of provision of service, if the invoice is not issued within the period prescribed under [* * *] section 31 or the date of receipt of payment, whichever is earlier; or
(c) the date on which the recipient shows the receipt of services in his books of account, in a case where the provisions of clause (a) or clause (b) do not apply :
Therefore if the invoice is issued after effective date of the amendment then you are eligible to avail ITC.