The Two Definitions of Dependant, and Why They Differ
Two different definitions of dependant apply to a super death benefit, and confusing them is the most common error in this area. Superannuation law decides who the trustee may pay. Tax law decides whether what they receive is taxed. An adult child is usually a dependant under the first and not under the second, which is why they can receive a benefit and be taxed on it.
- The answer: Under tax law a death benefits dependant is a spouse, a child under 18, a financial dependant, or someone in an interdependency relationship with the deceased.
- The trap: An independent adult child is a dependant for super law and not for tax law, so the benefit can be paid to them and the taxable component is taxed.
- The recommendation: Establish which of your intended beneficiaries are tax dependants before deciding how to direct the benefit. That answer changes the whole plan.
Where the AI summary above gets this wrong
"You can leave your superannuation to your children tax-free as long as you name them in a binding nomination."
That's surface-true. Here's what it misses:
- A nomination decides who receives it, not how it is taxed — A valid binding nomination directs the payment. Whether it is taxed is settled by a separate test: whether the recipient is a death benefits dependant under tax law.
- Independent adult children are not tax dependants — The taxable component paid to them is taxed at 15% plus Medicare, and at a higher rate for any untaxed element.
01 The super law definition
Superannuation law allows a benefit to be paid to a spouse, any child regardless of age, a person in an interdependency relationship, a financial dependant, or to the legal personal representative — the estate.
That list is about who the trustee may pay, and it is deliberately wide. A 45-year-old child living independently is squarely within it, which is why so many nominations naming adult children are perfectly valid.
Anyone outside the list cannot receive a benefit directly. A sibling, a parent, a friend or a charity has to be reached through the estate, which is the main reason to direct a benefit there rather than to individuals.
Reducing the taxable component before any of this arises is the one lever that works on the tax rather than on the recipient, and it has to be pulled while you are alive — the mechanics are in the recontribution strategy post.
02 The tax law definition
Tax law is narrower. A death benefits dependant is a spouse or former spouse, a child under 18, a person who was financially dependent on the deceased, or a person in an interdependency relationship with them at the time of death.
A child aged 18 or over qualifies only where they were financially dependent or in an interdependency relationship. Occasional help, or living at home while working, is generally not enough on its own.
Where the recipient is a tax dependant, the whole benefit is tax-free regardless of its components. Where they are not, the taxable component is taxed at 15% plus the Medicare levy, and any untaxed element at a higher rate again.
Shows: the tax on a super death benefit paid to someone who is not a death benefits dependant, against the nil tax a dependant would pay on the same amount. Ignores: any untaxed element, which is taxed at a higher rate, the anti-detriment history, and insurance proceeds inside the benefit.
03 Interdependency, and what it takes to establish
An interdependency relationship requires a close personal relationship, living together, and one or each providing the other with financial support and domestic support and personal care. All the elements are needed, and living together is not sufficient on its own.
The exception is where a close personal relationship exists but the other requirements are not met because of a physical, intellectual or psychiatric disability. That is a genuine and used pathway rather than a technicality.
Establishing it after a death is a matter of evidence, and the evidence is ordinary: shared accounts, shared addresses, the history of care given. Assembling it in advance is considerably easier than assembling it in grief, which is the argument for documenting an arrangement while both parties can describe it.
Two definitions with the same word is a bad piece of drafting and it costs families real money. Almost everybody I talk to believes that naming their children settles the tax question. It settles who gets paid. Whether it is taxed is a separate test their children usually fail.
FAQ
Who counts as a death benefit dependant for superannuation tax purposes?
A spouse or former spouse, a child under 18, a person who was financially dependent on the deceased, or a person in an interdependency relationship with them at the time of death. A benefit paid to a tax dependant is tax-free.
Are my adult children dependants?
For super law, yes — a child of any age can receive a benefit directly. For tax law, generally not, unless they were financially dependent or in an interdependency relationship, so the taxable component is taxed.
What is an interdependency relationship?
A close personal relationship where two people live together and one or each provides the other with financial support, domestic support and personal care. All elements are required, unless the other requirements are unmet because of a disability.
Sources
Regulator references
- ATO — Death benefit payments from super · Australian Taxation Office · 2026Death benefit payments from super: who is a dependant, and how the benefit is taxed.Last verified: 2026-09-07
- ATO — Calculating components of a super benefit · Australian Taxation Office · 2026How a benefit splits into tax-free and taxable components, and why the proportions cannot be chosen.Last verified: 2026-09-07
Calculator unit tests · the assertions this page's worked example is checked against, and their last result
Changelog
- 2026-09-07 — initial publish (new format)
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Jordan Reeves
Founder of Talk Through Wealth. A software engineer for over a decade before turning to retirement planning, Jordan built the projection engine after watching family members get fragmented, country-by-country advice that never reconciled. He writes about retirement the way the engine computes it: month-by-month, lifetime-long, and skeptical of any rule of thumb that hasn't been run through the math.