39 Progressive or periodic supplies
(a) a supply is made under an agreement, or an enactment, that provides (expressly or impliedly) that the thing supplied is to be supplied:
(i) for a period; or
(ii) progressively over a period; and
(b) that period begins before 1 July 2017 and ends on or after 1 July 2017;
then, for the purposes of the A New Tax System (Goods and Services Tax) Act 1999 as amended by this Act and for the purposes of item 38 of this Schedule:
(c) the supply is taken to be made continuously and uniformly throughout that period; and
(d) to the extent that the supply is taken to be made on or after 1 July 2017:
(i) any consideration for the supply received before the first tax period to start on or after that day is taken to be received in that tax period; and
(ii) an invoice relating to the supply issued before the first tax period to start on or after that day is taken to have been issued in that tax period.
(2) However, this item does not apply to:
(a) a supply of a warranty (whether express, implied or required by law) that relates to goods or a service, if the value of the warranty was included in the price of the goods or service; or
(b) a supply to the extent that it would be a taxable supply if the amendments made by this Schedule had not been made.
(3) If this item has an effect in relation to a supply, it has a corresponding effect in relation to the acquisition to which the supply relates.
(4) In this item:
warranty has the same meaning as in section 12 of the A New Tax System (Goods and Services Tax Transition) Act 1999.