What you would want to do is to make your new IP loan for the trust as high as possible and use any spare funds to make the PPOR loan as low as possible. A simple way is to cross collateralise. This not ideal, but may be ok for a few years until the IP increases in value and can be released.
Another way is to settle on the PPOR first and then use a LOC against this place for deposit to lend to the Trust for the IP. Then net result should still be the same but without crossing. Since your trust is buying your property, timing shouldn't be an issue. You just find the new PPOR first and then settle everything on the same day.
And make sure you get very good advice on the HDT setup, or your deductions could be denied by the ATO
Terryw | Structuring Lawyers Pty Ltd / Loan Structuring Pty Ltd
http://www.Structuring.com.au
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Lawyer, Mortgage Broker and Tax Advisor (Sydney based but advising Aust wide) http://www.Structuring.com.au