More than 15.5 million Australians may have little certainty over who receives their superannuation when they die, with new research revealing the vast majority of people have not put a binding death benefit nomination in place — and experts warning that even those who have may face unexpected hurdles.

Research from consumer group Super Consumers Australia has estimated the scale of the problem, finding that most Australians are leaving their retirement savings in limbo. The findings have prompted renewed concern about a system that many people misunderstand, often assuming their superannuation will simply follow instructions left in their will.

Why Your Will Doesn't Cover Your Super

A common misconception is that superannuation flows automatically through a person's estate. In reality, super sits outside the standard inheritance framework and requires a separate nomination made directly to the super fund.

"There are a lot of rules around who you can nominate, and they're a bit confusing, so a lot of people think that they've dealt with it when actually they haven't," said Jessica Spence, director of policy at Super Consumers Australia.

Generally, a binding death benefit nomination can only name individuals who fall within defined legal categories — typically a spouse, a child, or someone who meets the requirements of an interdependency relationship. Anyone who falls outside those categories cannot be named directly as a beneficiary through the fund.

One alternative is to nominate a legal personal representative, which allows the super to form part of the estate and be distributed according to a will. However, this approach creates its own complications, particularly for people who financially support family members living overseas — such as parents, siblings or other relatives who would not meet the legal definition of a dependant.

The Problem With Non-Binding Nominations

Even Australians who have taken the step of making a nomination are not necessarily guaranteed their wishes will be carried out. Associate Professor Natalie Silver from the University of Sydney, who researches superannuation as a form of inheritance, said non-binding nominations can be challenged — and often are.

"If it's non-binding, then there can be a challenge," Professor Silver said.

When a non-binding nomination is disputed, the relevant authority tends to prioritise financial dependency in determining where the money goes, which can effectively override whatever the deceased person had indicated. That leaves many people with far less control over their super than they may have realised.

There is also an important technical catch for those who do hold a binding nomination: these nominations typically lapse after three years, meaning instructions that were once locked in may no longer be valid unless renewed. Not all super funds even offer binding nominations, adding another layer of uncertainty for members.

A System Built Around a Traditional Model

Spence said the complications extend well beyond individual circumstances — they reflect a deeper structural issue within the superannuation system itself.

"The superannuation system was designed around a 'traditional model' of the people someone would be expected to support," she said, noting that this framework does not reflect the diverse family structures that exist across modern Australia.

People from migrant and transnational families are among those most affected, particularly where their closest relationships and financial obligations cross international borders. Indigenous Australians and others whose family structures don't align with the legal definition of dependency also face significant barriers.

For people in these situations, the gap between who they want to provide for and who the system allows them to provide for can be significant — and costly to navigate without proper legal or financial advice.

The issue intersects with broader debates about how Australia manages its retirement savings pool. Questions about the governance and purpose of the nation's multi-trillion-dollar super pool have intensified in recent months, with advocates calling for reforms that better reflect the realities of contemporary Australian families.

What Australians Should Do Now

  • Check whether your super fund offers binding death benefit nominations.
  • Review any existing nomination to confirm it has not lapsed — binding nominations generally expire after three years.
  • Consider whether your intended beneficiaries meet the legal definition of a dependant under superannuation law.
  • If you wish to leave super to someone outside those categories, seek legal advice about nominating a legal personal representative and ensuring your will is up to date.

Experts stress that the best time to review a nomination is well before it becomes urgent — because once it does, it is already too late.