If you pre-pay 1 yr interest to claim a tax deduction you need to do it the next year etc. else you have nothing to claim. It catches up eventually. It can certainly help if you know you have other income coming in and want to reduce your taxable income.
As for your posts about using Line of Credit, I think you might find yourself running into trouble with the ATO if you are using money borrowed against an investment property for private spending, then claiming the interest on those borrowings as a tax deduction.
Maybe it is legal but it doesn't sound like it is.
What I have found over 20+ yrs working and investing is that many people run different schemes and scams to avoid paying tax. Almost NONE of these schemes hold out to scrutiny once the taxman audits you.
The best way to be comfortable is to pay your debts when they are due, borrow to accumulate long term assets using the tax system legally, and spend less than you earn.
This takes time and patience. Good luck to you it sounds like you're going to need it if you get a call from the ATO.
