Australian carbon credit units
(3) If an * Australian carbon credit unit was issued to you under the Carbon Credits (Carbon Farming Initiative) Act 2011 , the cost of the unit is its * market value immediately after you began to * hold the unit.
Other registered emissions units
(4) The cost of a * registered emissions unit (other than an * Australian carbon credit unit to which subsection (3) applies) is the total of the expenditure that you:
(a) incurred in becoming the * holder of the unit; and
(b) can deduct under section 420 - 15.