The 2 trustees of the 2 trusts would be legal owners as Tenants in Common so if 1 trustee were to sell their share to the other stamp duty would be payable on 50% of the value of the property = $1mil.
if they held it 60% / 40% and 40% was transferred then stamp duty would be based on $800,000 transfer value.
I should add that there are also land rich provisions which may apply to acquiring shares in a private company or a unit trust which owns land above a certain value - there could be different stamp duty treatment.
So make sure you get advice on something like this as a $2mil property could mean the trust is land rich.
Just to add another layer of complexity we are considering a corporate trustee as an agent/custodian for the partnership. This will be the entity name on title and will hold the bank accounts etc rather than a title showing 3 disc trusts as tenants in common. Would this confuse the transfer of ownership issue as it's not a straight forward transfer of one of the tenants in common?
Rather than go back and forth wasting your time perhaps I could contact you to discuss over the phone. If that's okay with you is the 02 number on your website the best one to use? Feel free to PM me if you would prefer I use another number.
Thanks again so much for all your help. Between here and another property investment forum you've been helping my wealth creation journey without knowing it for almost 10 years!