Let us look at chapter 14 of CGST rules – Transitional Provisions. This text is taken from http://www.cbec.gov.in/resources//htdocs-cbec/gst/cgst-rules-01july2017%20.pdf
Tax or Duty Credit Carried Forward Under Any Existing Law or on Goods
Held in Stock on the Appointed Day
declaration electronically in FORM GST TRAN-1, duly signed, on the common portal specifying therein, separately, the amount of input tax credit of eligible duties and taxes, as defined in Explanation 2 to section 140, to which he is entitled under the provisions of the said
Provided that the Commissioner may, on the recommendations of the Council, extend the period of ninety days by a further period not exceeding ninety days.
Oriented Unit or a unit located in Electronic Hardware Technology Park, the credit shall be allowed to the extent as provided in sub-rule (7) of rule 3 of the CENVAT Credit Rules, 2004.
separately the following particulars in respect of every item of capital goods as on the appointed day-
credit under each of the existing laws till the appointed day; and
input tax credit under each of the existing laws till the appointed day;
sub-section (4) or subsection
stock held on the appointed day;
the following details, namely:—
invoice by the supplier or any document on the basis of which credit of input tax was admissible under the existing law;
value added tax [or entry tax] charged by the supplier in respect of the goods or services; and
books of account of the recipient.
shall be credited to the electronic credit ledger of the applicant maintained in FORM GST PMT-2 on the common portal.
law shall, in accordance with the proviso to sub-section (3) of section 140, be allowed to avail of input tax credit on goods (on which the duty of central excise or, as the case may be, additional duties of customs under sub-section (1) of section 3 of the Customs Tariff Act, 1975, is leviable)
possession of any document evidencing payment of central excise duty.
the rate of sixty per cent. on such goods which attract central tax at the rate of nine per cent. or more and forty per cent for other goods of the central tax applicable on supply of such goods after the appointed date and shall be credited after the central tax payable on such
supply has been paid:
credit shall be allowed at the rate of thirty per cent. and twenty per cent.
respectively of the said tax;
following conditions, namely:-
the details of stock held by him in accordance with the provisions of clause (b) of sub-rule (2), submits a statement in FORM GST TRAN 2 at the end of each of the six tax periods during which the scheme is in operation indicating therein, the details of supplies of such
goods effected during the tax period;
credit ledger of the applicant maintained in FORM GST PMT-2 on the common portal; and
can be easily identified by the registered person.
Declaration to be Made Under Clause (c) of Sub-Section (11) of Section 142
Declaration of Stock Held by a Principal and Job-Worker
Details of Goods Sent on Approval Basis
Recovery of Credit Wrongly Availed