wonderingagain with negative gearing, you basically do this:
John Q Bloke works as a trader in Ozzie bank. He pays 46.5% income tax on everything over $180k.
John Q Bloke buys an apartment in Melbourne for $300,000. On this he pays $17,500 in mortgage interest and other costs, and receives $11,000 in rent, so apparently renting it out at a loss of $6,500 per year.
In addition, he is allowed to write off 2.5% of the cost of his apartment as a capital allowance, this is $7,500 per year.
His deemed net loss is therefore $14,000 per year. The actual cash flow loss is $6,500, but he's also writing down $7,500 (2.5%) of the capital cost of the building.
This $14,000 loss, even though arising on a property, is then deductible against his personal income tax liabilities for working in the bank.
So he ends up deducting 46.5% of $14,000 off his tax bill tax = $6,510 per year.
As he is only losing $6,500 on renting the apartment out, he ends up making $10/year profit. Not much for sure, but it's a lot better than that $6,500 loss, and he reckons this time next year the apartment will be worth $325k, so it's fair dinkum after all.
Obviously the higher your income, the bigger benefit you get from doing this, and because in fact there isn't really a capital loss at all (since the capital values of the land are rising), a big portion of the tax loss is not a real loss.
Without the capital allowance, you could still use negative gearing to reduce the loss on the rent, but it's the capital allowances that make it really profitable.