Tax obligations arising from rebalancing and changes to managed portfolios are individual and not part of a pooled outcome (excluding any unitised managed fund or ETF holdings). With some platforms, you can model and select tax outcomes in a way that best suits your client, which may save them money and in turn help them grow more wealth over time with what would have otherwise been paid in tax. 

HUB24 offers tax optimisation at both an account level (managed portfolios and other separately held assets) as well as the managed portfolio level. You can estimate potential CGT impacts resulting from delaying the timing of switches and transactions (7-, 14-, 28-, and 60-day modelling), and model consequences of various tax treatments (FIFO, Min Gain, Max Gain) helping you to select  the best outcome for your client, which then automates the most appropriate parcels to be sold.