One of the most common misconceptions in estate planning is that Superannuation always passes tax-free to your children. It often does not. When a self-managed super fund (SMSF) death benefit is paid to an adult child, part of it can be taxed — sometimes significantly. But, just as importantly, not every adult child pays tax on every inherited benefit. The outcome turns on a distinction that trips up even careful planners: the difference between a dependant under superannuation law and a dependant for tax purposes ATO death benefits.

Two definitions of “dependant”

Superannuation law and tax law each define “dependant”, and they are not the same. Under superannuation law, a child of any age is a dependant, so an adult child can receive a death benefit ATO death benefits. Under tax law, however, the definition is narrower: a child is generally only a tax dependant if they are under 18, financially dependent on the deceased, or in an interdependency relationship with them. The result is that most financially independent adult children can receive a death benefit under super law but are not tax dependants — and that is what exposes them to tax.

How the tax works: it's about components

A super benefit is made up of a tax-free component and a taxable component, and the taxable component can include a taxed element and, less commonly, an untaxed element. When a death benefit is paid to a tax dependant, the whole lump sum is tax-free. When it is paid to a non-tax-dependant — the typical adult child — the tax-free component still passes tax-free, but the taxable component is taxed. The taxed element is taxed at up to 15%, and any untaxed element at up to 30%, with the Medicare levy added where the benefit is paid directly to the individual.

Estate versus direct payment

There is a subtlety worth knowing. Where a death benefit is paid directly to a non-dependant individual, the Medicare levy (currently 2%) is added, giving effective rates of up to 17% on the taxed element and up to 32% on any untaxed element. Where the benefit is instead paid through the deceased's estate (the legal personal representative), the Medicare levy is generally not applied, so the taxed element is taxed at up to 15% ATO death benefits. Which path is used can therefore change the tax bill, and it is one reason some plans deliberately direct benefits through the estate.

Why not every adult child is taxed

The headline that “adult children pay tax on super” is too broad. Several situations produce no tax. If the benefit consists entirely of tax-free component, nothing is taxable regardless of who receives it. If the adult child was in fact a tax dependant — for example, a child with a disability living with and financially dependent on the parent, or in a genuine interdependency relationship — the benefit is tax-free to them. And the amount of tax, where it applies, depends entirely on the size of the taxable component, which varies from fund to fund. So the correct statement is that adult children may face tax, not that they always will.

A benefit can be a lump sum or, sometimes, a pension

Who the beneficiary is also affects the form the benefit can take, which in turn interacts with tax. A tax dependant such as a spouse can often receive a death benefit as an income stream, spreading it out. A non-dependant — the typical adult child — must generally be paid a lump sum and cannot take a death benefit pension ATO death benefits. That means an adult child cannot defer the tax by drawing the benefit slowly as pension income; the taxable component is assessed when the lump sum is paid. Understanding this helps explain why the tax on an adult child's inheritance tends to crystallise in one hit rather than being smoothed over years.

A hypothetical example

Hypothetical: Margaret dies with $600,000 in her SMSF, made up of a $120,000 tax-free component and a $480,000 taxable component (all taxed element). Her only beneficiary is her son, David, 40, who is financially independent — a dependant under super law but not a tax dependant. The $120,000 tax-free component passes to David tax-free. The $480,000 taxable component is taxed: paid directly to David, at 17% (15% plus the 2% Medicare levy), that is $81,600. Had the benefit instead been paid via Margaret's estate, the Medicare levy would generally not apply, reducing the tax on the taxable component to 15%, or $72,000. If David had been genuinely financially dependent on Margaret, the entire $600,000 could have passed tax-free.

Planning within the rules

Because the tax falls on the taxable component paid to non-dependants, planning tends to focus on that component. Strategies such as withdrawing and re-contributing benefits after meeting a condition of release can, over time, increase the proportion that is tax-free component — but they are subject to the contribution caps and eligibility rules, and whether they help depends entirely on your circumstances ATO death benefits. Some members also consider drawing down benefits in their later years, or directing benefits via the estate, though each option has trade-offs. None of this is one-size-fits-all, and it is an area where personal advice is genuinely valuable rather than optional.

The practical message is to understand what your children would actually receive, not what you assume. Ask your fund what your tax-free and taxable components are, identify whether your intended beneficiaries are tax dependants, and model the likely tax on a death benefit paid to a non-dependant. That knowledge lets you plan deliberately — and it prevents the unpleasant surprise of a family discovering, at the worst possible time, that a chunk of an expected inheritance has gone to tax. The rules are nuanced, but they are knowable, and knowing them is the first step to managing them. The essential correction to the popular belief is simple: adult children may be taxed on the taxable component of a super death benefit, but whether they are, and how much, depends on their tax-dependant status and the make-up of your benefit — not on a blanket rule that catches everyone.