subdividing and building duplex on mum's PPOR. If we were to purchase 50% of mum's property with original house still intact, would this be a CGT event? But it would require stamp duty payable? we would then enter into a deed of partition 50:50 with mum as tenants in common. Knock down the house, build duplex and subdivide as torrens title so mum has her own property independently. As I understand this subdivision would not be CGT or stamp duty event. Is this true? We need to get this right as it would be costly if we don't. I originally spoke to our accountant with a different scenario : knock down the house, subdivide , mum sells us half then we finance building the duplex . He said there would be no CGT payable in this instance but I really doubt this as once the house is gone and the land is subdivided the PPOR exemption is no longer there and all the reading I have done says it would be a CGT event. Please correct me if I've got any terminology or understandings incorrect. Total newbie .