(1) For the purposes of this section -
''full year'' shall be any continuous period of twelve months;
''interest'' in relation to immovable goods has the meaning assigned to it by section 4.
(2) Where -
(a) a person makes a transfer of an interest in immovable goods in accordance with section 3(5)(b)(iii), and
(b) but for the application of that section, tax would have been chargeable on the transfer, and the person (referred to in this section as a 'transferor') was entitled to deduct part of the tax charged on the most recent purchase or acquisition of an interest in, or the development of, the immovable goods subject to that transfer,
that transferor shall, for the purposes of section 12, be entitled to increase the amount of tax deductible for the taxable period within which the transfer is made by an amount calculated in accordance with the following formula:
where -
T is the tax chargeable on that most recent purchase or acquisition of an interest in, or that development of