Negative Gearing vs Super: Which Tax Break Wins?

01 A deduction is not a saving

Negative gearing means your rental property runs at a loss — interest and holding costs exceed the rent — and that loss reduces your taxable income, so you recover your marginal rate on it.

The word "benefit" does a lot of work there. The deduction is a partial refund on a real cash loss you actually incurred. Lose $10,000 across the year, get $3,900 back at a 39% marginal rate, and you are still $6,100 down. You have not saved $3,900; you have lost $6,100 instead of $10,000.

That is the entire structure of the strategy and it is worth stating plainly because the marketing never does. Negative gearing does not make money. It reduces the cost of holding an asset you expect to appreciate, and the whole case rests on the appreciation being larger than the accumulated after-tax losses.

Which means a negatively geared property is a bet on capital growth, funded monthly out of your salary, with the tax system covering part of the funding cost. It can be a perfectly reasonable bet. It is not a tax strategy, and someone who cannot articulate the growth assumption underneath it does not have a plan — they have a subsidised loss.

Negative gearing is routinely described as a tax benefit, and calling it that inverts what it is. The deduction is a partial refund on a loss you actually incurred: lose $10,000 and recover $3,900, and you are $6,100 down. People assume they are being paid to hold the property; they are being subsidised for the cost of holding it, which only makes sense if the capital growth exceeds the accumulated losses.

Source: ATO — Negative gearing

02 Salary sacrifice is a saving on money you keep

Salary sacrifice has the opposite shape: you keep the money, and you save the tax.

A dollar sacrificed is taxed at 15% inside super instead of at your marginal rate, so on the 39% bracket you are 24 cents ahead the moment it happens — and the dollar is still yours, invested, rather than having funded a shortfall. There is no cash drain, no tenant, no interest rate to survive, and no assumption about future growth required for the saving to be real.

The difference in kind matters more than the difference in size. Negative gearing's return depends on an uncertain future event; salary sacrifice's return is banked in the year it happens and does not depend on anything. One is a bet with a subsidy attached, the other is a discount.

The limits are the cap and the lock. The concessional cap of $30,000 includes employer Super Guarantee, so the room is finite and usually modest — often $12,000 to $15,000 for a good salary. And the money is preserved until 60. Within those limits, though, it is the closest thing to a free lunch in the system, and it is available without borrowing anything.

Source: ATO — Salary sacrificing super

03 Worked example: the two tax effects side by side

Put the same dollar amount through both. Negative gearing refunds your marginal rate on the loss; salary sacrifice saves the gap between your marginal rate and 15% on money you keep. The numbers make the difference in kind obvious — one is a refund on a loss, the other a saving on savings.

On the defaults above, the worked example shows: Negative gearing refunds part of a $10,000 loss you actually incur; salary sacrifice saves tax on money you keep. The loss has to be outweighed by capital growth to make sense.

04 When property still makes sense

Geared property can absolutely work — but on capital growth, and never on the deduction.

The conditions are specific. You genuinely expect strong long-run growth in that market, for reasons you could state. You can carry the annual cash shortfall without strain, including if rates rise two percentage points and the property is vacant for two months. And you want the leverage and the direct control that property uniquely offers.

The 50% capital gains discount on assets held longer than twelve months materially improves the sale-side arithmetic, and is a genuine part of the case. So is the fact that the loan amortises: a property held for twenty years is usually positively geared long before the end, and the early losses were the entry price for an asset now producing income.

What it should not be is a response to a large tax bill. If the motivation is "I want to pay less tax", the honest arithmetic is that spending $10,000 to recover $3,900 is a poor way to achieve that, and filling the concessional cap achieves more with no risk and no cash drain. Buy the property because you want the asset. The deduction is a consolation for the cost of holding it, not a reason to hold it.

Source: ATO — CGT discount

05 Why property is sold as a tax play

It is worth understanding why the tax-benefit framing is so pervasive, because the answer explains most of the bad decisions in this area.

The deduction is the easiest thing to put on a marketing flyer. It is certain, it is immediate, it can be stated as a single number, and it sounds like a benefit rather than a consolation. The risks — vacancy, rate rises, a flat market, the cash you contribute every month for years — are diffuse, in the future, and difficult to fit on a slide.

The incentives compound that. A property marketer, a mortgage broker and a developer are all paid when the transaction happens, and none of them is paid less if the growth assumption turns out wrong. Nobody in that chain is paid to tell you that filling your concessional cap is a better use of the same money.

Two signals worth treating as warnings. Any presentation that leads with the tax deduction rather than the expected total return is selling the wrong thing, because the deduction is a fraction of a loss and the return is the whole case. And any projection showing steady annual growth in a straight line is describing an asset class that has never behaved that way.

The question to ask in any such conversation is simply: what does this cost me per month, for how many years, and what does the property need to do for that to have been worth it? A good answer exists for some properties. The absence of one is the answer.

Source: ASIC Moneysmart — Property investment

06 Can you do both?

Plenty of people sensibly do both, and they are not mutually exclusive. The order, however, is not arbitrary.

Fill the concessional cap first, because that saving is certain: it is realised in the year you make it, it does not depend on any market, and it requires nothing of you afterwards. Then, if you still have capacity, a geared property sits on top as an additional leveraged growth bet funded from money you can genuinely afford to commit for a decade or more.

Doing it the other way round is common and is how households end up over-committed. The property's cash shortfall consumes exactly the surplus that would have funded the salary sacrifice, so the certain benefit is given up to fund the uncertain one — and because the shortfall is a contractual obligation and the salary sacrifice is not, it is always the sacrifice that gets cut.

A reasonable test before adding the property: if you stopped salary sacrificing entirely to fund the shortfall, would you still buy it? If the honest answer is no, then the property is being funded by giving up a guaranteed 24 cents in the dollar, and that cost belongs in the calculation.

Source: ATO — Salary sacrificing super

07 Two tax breaks, side by side

Both reduce your tax bill. They do it in structurally different ways, and the difference is the whole decision.

The second row is the one to sit with. Both lines describe a tax break, and only one of them leaves you with more money than you started the year with.

Source: ATO — Negative gearing