Section 12 - Time of supply of goods of CGST ACT, 2017

      12. (1) The liability to pay tax on goods shall arise at the time of supply, as determined
in accordance with the provisions of this section.
           (2) The time of supply of goods shall be the earlier of the following dates, namely:—
               (a) the date of issue of invoice by the supplier or the last date on which he is
required, under sub-section (1) of section 31, to issue the invoice with respect to the
supply; or
              (b) the date on which the supplier receives the payment with respect to the
supply:
              Provided that where the supplier of taxable goods receives an amount up to one
thousand rupees in excess of the amount indicated in the tax invoice, the time of
supply to the extent of such excess amount shall, at the option of the said supplier, be
the date of issue of invoice in respect of such excess amount.

               Explanation 1.––For the purposes of clauses (a) and (b), “supply” shall be
deemed to have been made to the extent it is covered by the invoice or, as the case may
be, the payment.
               Explanation 2.––For the purposes of clause (b), “the date on which the supplier
receives the payment” shall be the date on which the payment is entered in his books
of account or the date on which the payment is credited to his bank account, whichever
is earlier.
     (3) In case of supplies in respect of which tax is paid or liable to be paid on reverse
charge basis, the time of supply shall be the earliest of the following dates, namely:—
            (a) the date of the receipt of goods; or
            (b) the date of payment as entered in the books of account of the recipient or the
date on which the payment is debited in his bank account, whichever is earlier; or
           (c) the date immediately following thirty days from the date of issue of invoice or
any other document, by whatever name called, in lieu thereof by the supplier:
Provided that where it is not possible to determine the time of supply under
clause (a) or clause (b) or clause (c), the time of supply shall be the date of entry in the
books of account of the recipient of supply.
    (4) In case of supply of vouchers by a supplier, the time of supply shall be—
          (a) the date of issue of voucher, if the supply is identifiable at that point; or
          (b) the date of redemption of voucher, in all other cases.
    (5) Where it is not possible to determine the time of supply under the provisions of
sub-section (2) or sub-section (3) or sub-section (4), the time of supply shall––
         (a) in a case where a periodical return has to be filed, be the date on which such
return is to be filed; or
        (b) in any other case, be the date on which the tax is paid.
   (6) The time of supply to the extent it relates to an addition in the value of supply by
way of interest, late fee or penalty for delayed payment of any consideration shall be the date
on which the supplier receives such addition in value.