Section 4B of the Principal Act is amended -
(a) by substituting the following for subsection (5):
"(5) Subject to subsection (8), where a taxable person who carries on a business in the State supplies immovable goods to another taxable person who carries on a business in the State in circumstances where that supply would otherwise be exempted because of subsection (2) of this section, or section 4C(2) or (6)(b), then, despite those provisions, tax is chargeable on that supply, but only if the supplier and the taxable person to whom the supply is made have, no later than the 15th day of the month after the month during which the supply occurred, entered into an agreement in writing to opt to have tax chargeable on that supply (in this Act referred to as a 'joint option for taxation').",
and
(b) by inserting the following after subsection (6):
(a) In this subsection -
'owner' means the accountable person referred to in section 3(7);
'purchaser' means the person to whom the im