Most Australians never choose a superannuation fund, never choose an investment option inside it, and rarely look again once contributions start arriving. That isn't a side effect of super being complicated. It's the default setting the whole system runs on, and defaults are exactly what behavioural economics studies.
The same handful of mechanisms this site documents elsewhere, defaults, loss aversion, present bias, and choice overload, show up in superannuation at a scale most other domains never reach. It's a compulsory system holding trillions of dollars, running for forty years, on decisions almost nobody actively makes. When those mechanisms work against a saver, the cost compounds for decades. When they're redesigned to work for one, the same compounding runs the other way.
This report walks through four real, documented ways behavioural tendencies have cost Australian retirement savers real money, and one real policy fix that used the exact same mechanism to reverse the damage.
The story in four parts
Most super accounts run on autopilot from day one: whichever fund and investment option applied by default is the one that quietly compounds for forty years.
Loss aversion pushed real members into cash at the exact bottom of the 2020 crash, turning a paper loss everyone else recovered from into a permanent one.
A one-off withdrawal feels like solving today's problem. Four decades of missed compounding is the part nobody sees at the time.
A 2021 law change used the identical default-setting power that caused the multiple-accounts problem to solve it instead.
The evidence at a glance
A third of all Australian super accounts are unintended duplicates, the Productivity Commission found, costing members $2.6 billion a year in unnecessary fees and insurance.
In a single 21-day window in 2020, tens of thousands of members at one fund switched to cash as $34.2 billion was stripped from its value, locking in losses the market went on to recover.
3.05 million Australians withdrew retirement savings early during the pandemic. A modest amount taken out decades before retirement costs far more than that once the lost compounding is counted.
From November 2021, an existing super account follows a worker to a new job by default. Multiple unintended accounts stopped being the automatic outcome.
If a new employee doesn't nominate a fund, the law requires their employer to pay contributions into a MySuper product instead, a standardised default built specifically for people who don't choose. That single design decision, not a lack of financial literacy, is why most super accounts run on autopilot from the very first pay cheque. Whichever fund and investment option applied by default is the one that quietly compounds, or underperforms, for the next forty years.
Every time someone starts a new job without nominating a fund, a new default account has historically opened, on top of whatever account already existed from the last job. The Productivity Commission's 2018 inquiry into the whole system found the scale of that pattern. About a third of all Australian super accounts, roughly 10 million of them, were unintended duplicates. Each one carried its own set of fees and, often, its own default insurance policy running quietly in the background.
How does simply not choosing twice end up costing a saver tens of thousands of dollars?
The Commission put a number on it: unintended multiple accounts were draining members of $2.6 billion a year, split between $1.9 billion in unnecessary insurance premiums and $690 million in excess administration fees. Some individual members, holding several forgotten accounts each with its own default life or disability cover, saw their eventual balance eroded by more than $50,000 through duplicate or unsuitable policies alone.
What it teaches: nobody sets out to open a second super account on purpose. The default simply opens one anyway, every time a saver doesn't actively say otherwise, and the fees and insurance premiums it carries compound in total silence.
A balance falling in a market downturn is a paper loss. It only becomes a real one the moment someone sells at the bottom instead of waiting for the recovery that historically follows. Loss aversion makes that exact mistake feel like the safe choice, because the pain of watching a loss grow, even temporarily, outweighs the far larger cost of locking it in.
In March 2020, as markets fell as much as 20% in a single month, that's exactly what happened at scale. At AustralianSuper alone, 76,042 members switched their investment option in a 21-day window, a period in which the fund's own value fell by $34.2 billion. System-wide, the share of superannuation assets held in cash rose noticeably that month, a bigger shift than the entire Global Financial Crisis produced.
Why does switching to cash feel safer, right at the exact moment it does the most damage?
Members who switched to cash near the March 2020 low locked in whatever loss had already happened, then missed the rebound that followed within months. On one industry estimate, someone with $100,000 in super who switched to cash at the trough could have ended up around $50,000 worse off five years later than if they'd done nothing at all.
What it teaches: the coin never actually flips until you sell. A balance that's fallen on paper is still fully invested in the recovery; the only way to guarantee the loss is real is to convert it into cash at the low point, which is precisely when loss aversion makes that feel like the responsible move.
This is the same mechanism this site's own Loss Aversion and Risk Aversion entries already document, just at a scale most other choices never reach. As the Risk Aversion write-up puts it: a saver who avoids the market on a decades-long horizon “is applying a short-horizon risk judgment to a long-horizon decision.” A super balance is designed to be looked at rarely and held for decades. A market crash makes it feel like something to act on today.
A dollar needed today feels a great deal more urgent than the same dollar's absence in forty years, even when the maths runs the other way. Present bias is what makes an immediate, concrete need consistently outweigh a distant, abstract one. Superannuation puts that tension in the starkest possible terms: money is either available now or compounding for decades, never both.
The COVID-19 Early Release Scheme let it play out at national scale. Between April and December 2020, the Australian Taxation Office approved 4.55 million applications from 3.05 million people, releasing $37.8 billion of superannuation early, most of it in response to a genuine, sudden loss of income. The scheme did exactly what it was built to do for people in real hardship. It also demonstrates, at a scale no lab study could reach, how heavily an urgent present need outweighs a retirement outcome too distant to feel real yet.
Why does a withdrawal that solves this month's problem cost so much more than its own dollar value?
Every dollar withdrawn in someone's 20s, 30s, or 40s stops compounding from that point on, for however many decades remain until retirement. A withdrawal that feels like a modest, one-off adjustment today is the exact amount, plus every year of investment growth it would otherwise have earned, missing from the final balance. The size of that gap is precisely what makes it so easy to underweight in the moment: the cost is real, but it's decades away and easy to imagine dealing with later.
What it teaches: a genuine short-term need and a present-biased decision aren't mutually exclusive. The scheme responded to real hardship for millions of people, and the same policy still shows, at scale, how automatically a distant retirement balance loses out to an urgent, immediate one, exactly the trade-off present bias predicts.
Every duplicate account from the default problem above doesn't just carry its own fee. It usually carries its own investment menu and its own default insurance too, multiplying the number of real decisions a saver would need to make to actually optimise their super, from one to several. Choice overload doesn't just make people choose worse. It makes a lot of people not choose at all, which is exactly the outcome that leaves duplicate fees and unsuitable insurance running for years, unnoticed.
Where a choice does get made, the naive “1/n” heuristic shows up in retirement investing too: splitting attention or money evenly across whatever options are on the menu, rather than weighing what each one actually holds. It's the same pattern this site's Diversification Heuristic entry already documents in a defined-contribution retirement plan.
Every mechanism above runs on the same design feature: a default that applies automatically when nobody actively decides otherwise. That's not a reason to distrust defaults. It's the reason a single, well-placed default can fix a problem a thousand disclosures never would. The multiple-accounts problem is the clearest proof of it.
From 1 November 2021, the Treasury Laws Amendment (Your Future, Your Super) Act changed what happens when a new employee doesn't nominate a fund. Instead of a new default account opening automatically at the new employer, an existing super account is now “stapled” to the worker and follows them from job to job. The exact default mechanism that had been creating a third of Australia's super accounts by accident was redirected to stop creating them.
If defaults caused the problem, can the same lever undo it?
Stapling didn't ask anyone to make a better decision, read a disclosure more carefully, or become more engaged with their super. It changed what happens automatically when nobody decides at all, from “open a new account” to “keep the one you already have.” The behaviour the Productivity Commission's $2.6-billion-a-year finding was built on, inertia, is the same behaviour the fix relies on. It's just aimed the other way.
What it teaches: a default is a design decision either way, never a neutral absence of one. The only real question is which outcome it's quietly steering people toward.
The same principle already shows up elsewhere in super, deliberately. Most MySuper products now use a lifecycle investment strategy that automatically shifts a member's default allocation toward lower-risk assets as they approach retirement, without requiring anyone to notice the date or make the switch themselves. And Australia's compulsory Superannuation Guarantee rate has risen on a legislated schedule, from 9.5% toward 12%, lifting the whole population's savings rate without asking a single individual to opt in. It's a compulsory rise rather than an opt-out nudge, but the underlying logic is the one this site's own Smart Defaults entry documents in Thaler and Benartzi's Save More Tomorrow programme: schedule the increase for later, and it never has to feel like a loss today.
None of the four patterns above require anyone to be careless. They're the default outcome of a system most people are never prompted to actively check, which is exactly why checking deliberately, once, is worth the half hour it takes.