Highlights

• Division 296 would introduce an additional 15% tax on earnings attributable to the portion of a superannuation balance above AUD 3 million.
• The proposed tax is applied proportionally, meaning the effective impact depends on how far a balance exceeds the threshold.
• Worked examples show that the additional tax burden rises as a larger share of a balance sits above AUD 3 million.
• Key uncertainties remain around the treatment of unrealised gains, threshold indexation, and the final legislative design.

Few areas of tax policy generate as much confusion as the interaction between two layers of tax sitting on the same pool of money. Division 296, the proposed measure that would add a second slice of tax to very large superannuation balances, is a textbook example. Headlines describe it as a tax shock, yet the actual mechanics are more measured, and more nuanced, than a single dramatic number suggests. The purpose of this article is to unpack how the Division 296 tax is calculated, why it raises the effective rate on earnings above the threshold, and what that looks like through simple, conceptual illustrations.

The examples that follow use round figures to demonstrate the principles. They are deliberately schematic, are not advice, and are not a substitute for a calculation based on your own balance and the final form of the law.

Quick summary

Division 296 proposes an additional 15 per cent tax on the portion of super earnings attributable to a total superannuation balance above $3 million, layered on top of the existing 15 per cent on fund earnings. Because only a proportion of earnings is caught, the headline effective rate of around 30 per cent applies only to the share above the threshold, not the whole balance. The Division 296 tax is calculated at the individual level using a simple proportional formula, and the final design is still subject to legislation.

Why this matters now

Understanding the mechanics matters now because misreading them leads to poor decisions. Some people assume the extra tax hits their entire balance, conclude that super has become punitive, and consider drastic moves. Others assume it is trivial and ignore it entirely. The truth sits between those poles, and getting the arithmetic right is the difference between a calm, considered response and an overreaction.

With the measure framed around a 1 July 2026 commencement, and with several design points still moving through debate, this is the moment for affected individuals to grasp how the numbers actually behave so they can interpret the final rules sensibly when they land.

Who may be affected

The proposal targets individuals whose combined superannuation across all funds exceeds $3 million, measured at the end of the financial year. On the figures cited during the debate, that is initially a small slice of account holders, around half a per cent, or tens of thousands of people. Because the original design did not index the threshold, the group captured could widen gradually over time as balances grow, even without any change to the rules.

What investors should understand: the mechanics

Start with the existing position. Earnings inside a superannuation fund in accumulation phase are generally taxed at 15 per cent. Division 296 does not change that base layer. Instead, it proposes an additional 15 per cent on a defined slice of earnings, producing an effective rate of roughly 30 per cent on that slice.

The slice is defined by a proportion. The share of earnings exposed to the extra tax equals the total superannuation balance minus $3 million, divided by the total superannuation balance. The crucial point is that this proportion is almost always well below 100 per cent, so the effective rate across the whole balance is far lower than 30 per cent.

Worked illustration one: a balance of $4 million

Imagine an individual with a total superannuation balance of $4 million. The proportion above the threshold is ($4,000,000 minus $3,000,000) divided by $4,000,000, which is 25 per cent. If we suppose, purely for illustration, that the year's measured earnings are $200,000, then 25 per cent of that, or $50,000, falls within the Division 296 net. The additional 15 per cent applies to that $50,000, producing roughly $7,500 of extra tax. Spread across $200,000 of earnings, the additional impost represents an extra 3.75 per cent on total earnings, not 15 per cent.

Worked illustration two: a balance of $6 million

Now take a balance of $6 million. The proportion above the threshold is ($6,000,000 minus $3,000,000) divided by $6,000,000, which is 50 per cent. On the same illustrative $200,000 of earnings, half, or $100,000, is caught, and the extra 15 per cent on that produces around $15,000 of additional tax. As the balance rises, a larger share of earnings is captured, and the effective rate edges closer to the headline 30 per cent figure, but only the very largest balances approach it.

These figures are conceptual. They assume a particular earnings figure and ignore the many real-world details that a proper calculation would include. Their only job is to show the shape of the policy: a graduated impost that scales with how far above $3 million a balance sits.

The unrealised gains question

The examples above quietly assumed an earnings figure, but how earnings are measured is itself contested. The original proposal defined earnings as the year-on-year change in total superannuation balance, adjusted for contributions and withdrawals. Because that captures movement in value rather than only realised profits, it could include unrealised gains, increases on assets that have not been sold. A person could therefore face a Division 296 liability in a year when their fund sold nothing, simply because their holdings rose in value on paper. This is described here as a feature of the original proposal, not as settled law, and it is among the elements most likely to be examined before the measure is finalised.

SMSF and managed super fund considerations

The calculation is the same regardless of fund type, because it is performed at the individual level on aggregated balances. Where the difference bites is in funding any liability. A member of a large pooled fund usually holds liquid, diversified assets, so meeting an additional bill, whether paid personally or released from super, is generally manageable. A self-managed fund holding a single property or an illiquid investment may have less ready cash, which matters most if the final law retains a measure that can tax unrealised gains. In that scenario, the timing of the liability and the availability of cash become practical planning issues rather than purely arithmetic ones.

Possible planning options

The following are general areas of discussion, offered for context rather than as recommendations, and none should be pursued without advice from a licensed professional. Commentators discuss reviewing the level and timing of voluntary contributions, considering partial withdrawals or recontribution where a person is eligible, and weighing whether some surplus wealth might sit in alternative structures such as family or discretionary trusts, investment or insurance bonds, or philanthropic vehicles. Each alternative carries its own tax treatment and costs, and what reduces one person's exposure may not suit another at all.

One mechanic worth noting is the choice of how to pay. The individual is liable and can generally elect to settle the additional amount personally or have it released from super. Paying from outside preserves the balance; paying from within reduces it. That single choice can influence next year's proportion and therefore next year's liability.

Risks and uncertainties

The largest uncertainty is that the rules are not final. The start date, the treatment of unrealised gains and the question of indexation all moved during debate, and any of them could change the numbers in the illustrations above. A second risk is misinterpretation: treating the headline 30 per cent as if it applied to a whole balance overstates the impact and can drive costly overreaction. A third is liquidity, relevant chiefly where a liability might fall on gains that have not been realised.

What to watch before 1 July 2026

Key items to monitor include the confirmed commencement date, the final definition of earnings and whether unrealised gains remain in scope, any decision to index the $3 million threshold, and administrative guidance from the Australian Taxation Office on how the proportion is calculated, reported and paid. Each of these directly affects the size and timing of any Division 296 tax an individual might face.