Hi Babushka
We recently did exactly that, selling PPOR to a trust, with it becoming an IP.
If he needs something 'tax effective' it might be worth mentioning HDT (Hybrid Discretionary Trust) which allows the ability to claim negative gearing benefits.
The downside of transferring the previous PPOR to IP is the cost of the Stamp Duty which is unavoidable, and the costs and effort of setting up the structure.
Your friend would be best to run his calculations based each scenario with fair market value of each property, the costs of setting up and maintaining the Trust, and negative gearing or other benefits, paying the stamps etc.
If this is the first of many IP's, the trust idea may well be a goer. If this is a once off deal, it might be simpler and more cost efficient to simply forego some tax effectiveness, maybe release some of the equity in the original PPOR to invest elsewhere and generate income to help pay off the new PPOR and its bigger mortgage. Depends on the figures I 'spose.
Its not hard to do, but not enjoyable (or cheap) either, so let the calculations do the talking
Cheers
Carl