Little known rule to save thousands in tax: 'Extra $5,000 plus every year'

Finance expert Ben Nash next to person holding wad of cash
Finance expert Ben Nash explained the pitfalls of an offset account versus redrawing on your mortgage. (Source: Instagram/Getty)

A lot of people have cost themselves a lot of money by getting this wrong. Under the Australian tax rules, there’s an important difference between offset accounts and redraw when it comes to the tax deductibility of your debt.

This situation commonly plays out where someone buys a property, often their first property, and thinks they’re doing all the right things by trying to pay down their mortgage as quickly as they can. You make extra repayments to get your debt down, and over a period of time you make some real progress.

Then, as time passes you realise you want to upgrade your home for more space, a different location, or some sort of combination of the two.

If this happens to you, you’re probably going to be in a strong position to borrow more money from the bank.

Your debt levels have reduced.

Because you’ve paid down debt, your savings capacity and debt servicing capacity are higher, and more than likely your first property has increased in value, which gives you some more ‘equity’ to borrow against.

To buy your new property you need a deposit, and because you’ve paid down a heap of your debt you have the ability to simply ‘redraw’ money from your mortgage.

This gives you the deposit for your new property, and once you have that deposit the banks will typically lend you the rest of the money to fund your purchase.

The redraw mistake

But the issue with this approach comes from the different tax treatment of redrawing money.

In this example, because the purpose of redrawing money from your mortgage is to buy your own home, under the tax rules the interest on this debt isn’t tax deductible.

So in this case, your new property is entirely funded with non-tax deductible debt.

And it gets worse if you intend to keep your original property, which many people want to do because either they have an emotional attachment to the property, because they think it will keep growing into the future, or simply because the cost of buying and selling property is so high.

For your first property, this will now be converted to an investment property.

This gives you the huge benefit that as soon as this happens, all of your mortgage interest costs immediately become tax deductible.

This sounds great, but there’s one big problem - because you have paid down a chunk of the mortgage debt on this property, your interest costs, and therefore your tax deductions, are a lot lower.