If you acquired the original asset on or after 20 September 1985:
(a) the first element of the replacement asset's cost base is replaced by the original asset's cost base at the time you acquired the replacement asset; and
(b) the first element of the replacement asset's reduced cost base is replaced by the original asset's reduced cost base at the time you acquired the replacement asset.
Note 1: Some replacement - asset roll - overs involve other rules that affect the cost base or reduced cost base of the replacement asset.
Note 2: If you acquired the original asset before 20 September 1985, you are taken to have acquired the replacement asset before that day: see Subdivision 124 - A.
Note 3: The reduced cost base may be further modified if the replacement asset roll - over happens after a demerger: see section 125 - 170.