The past few years have made sure that's not going to happen, it's already at the point where it's cheaper to rent a house than own it with a 80% mortgage, as more rentals come off low interest rates and the week to week interest cost increases rents aren't going to come down. What will probably happen is that more landlords will get sick of tipping money in and sell off to first home buyers, further reducing the availability of rentals.
I'm not sure when it became normalised to refer to interest deductibility as a 'tax break' for landlords, when it's the same as any other business that borrows money and interest cost is considered an expense.
That's the bit that seems to have been missed that a large proportion of these vehicles are business owned, so it's a few more tax deductible dollars the business fronts up to buy it, but the current tax structure still makes it a better proposition as an ongoing business expense.
Wasn't it proposed to remove the tax from petrol, and charge RUC for all vehicles? At the moment there's an incentive to reduce the number of litres you pour in as that's the tax multiplier, if the tax is on mileage you'll get the stupid situation that exists for small diesels where the RUC cost far outweighs the gains from spectacularly good fuel economy.
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