The age of consent in Australia is 16 in most of the country and 17 in South Australia and Tasmania. Each state and territory sets its own criminal law, so the threshold, the defences available, and the way the law treats things like sexting and relationships with teachers or coaches all vary depending on where the activity takes place.
Age of Consent by State and Territory
Six jurisdictions set the age at 16:
- New South Wales, under the Crimes Act 19001NSW Department of Education. Age of Consent and Related Sexual Offences
- Victoria, under the Crimes Act 19582Victoria Police. Consent and Consent Laws
- Queensland, under the Criminal Code Act 18993Queensland Government. Sexual Activity with Young People Aged 16 to 17
- Western Australia, under the Criminal Code Act 1913
- Australian Capital Territory, under the Crimes Act 19004ACT Legislation Register. Australian Capital Territory Crimes Act 1900
- Northern Territory, under the Criminal Code Act 19835NT Legislation. Northern Territory Criminal Code Act 1983
Two jurisdictions set the age at 17:
- South Australia, under the Criminal Law Consolidation Act 1935
- Tasmania, under the Criminal Code Act 19246Legal Information Institute. Criminal Code Act (Tasmania)
The law that applies is the law of the place where the activity happens. A 16-year-old visiting Adelaide from Melbourne is protected by South Australia’s higher threshold of 17, regardless of what is legal back home. This catches people out during interstate travel and holidays.
Close-in-Age Defences for Teenagers
Most Australian jurisdictions accept that teenagers of similar age form sexual relationships with each other, and their laws provide a defence to keep genuinely peer-to-peer activity out of the criminal system. The rules differ significantly from one state to the next.
- New South Wales: available if the younger person was at least 14 and the age gap was no more than two years.7NSW Legislation. Crimes Act 1900 No 40
- Victoria: available if the younger person was at least 12 and the age gap was no more than two years.8Victoria Legal Aid. Age of Consent
- Australian Capital Territory: available if the younger person was at least 10, the accused was no more than two years older, and the younger person consented.4ACT Legislation Register. Australian Capital Territory Crimes Act 1900
- Western Australia: available if the younger person was between 13 and 16, the accused was less than three years older, and the accused reasonably believed the child was 16 or older.
- Tasmania: tiered. If the younger person was at least 15, the accused can be up to five years older. If the younger person was at least 12, the gap shrinks to three years.
- Queensland: no close-in-age defence exists.
- Northern Territory: no close-in-age defence exists.
The absence of any close-in-age defence in Queensland and the Northern Territory is the single most common trap in this area of law. A 17-year-old in Queensland who has a consensual sexual relationship with a 15-year-old partner can face criminal charges with no special defence, however small the age gap. South Australia’s position is unclear on the face of the legislation, so anyone in that situation should get legal advice.
Where a defence does exist, the defendant carries the burden of showing the age gap was within the permitted range. None of these defences apply if there was any coercion, threats, or exploitation.
Does “I Thought They Were Older” Count as a Defence
Whether an honest mistake about age is a defence depends entirely on the jurisdiction, and in most of Australia the answer is no or only in limited circumstances.
The ACT provides a defence where the accused believed on reasonable grounds that the other person was 16 or older.4ACT Legislation Register. Australian Capital Territory Crimes Act 1900 Victoria allows an honest and reasonable belief about age to be raised in some circumstances, including belief that the age gap fell within the two-year limit.8Victoria Legal Aid. Age of Consent Elsewhere, the offences are treated more strictly when it comes to age, and the prosecution does not need to prove the accused knew how old the other person was. In practice, many of these offences work on a strict-liability basis on the age element.9Attorney-General’s Department. Mistake of Fact (Strict Liability)
The practical takeaway is straightforward. If you are the older person, the law in most of Australia expects you to verify the other person’s age. Getting it wrong, even genuinely, will not save you in most jurisdictions.
When the Age of Consent Rises to 18
Even where the younger person is above the general age of consent, a separate set of rules kicks in when the older person holds a position of authority, care, or supervision. In those relationships, the effective age of consent rises to 18 across every Australian state and territory.1NSW Department of Education. Age of Consent and Related Sexual Offences The reasoning is the power imbalance in the relationship.
Roles that trigger the higher threshold include teachers, sports coaches, religious instructors, healthcare providers, foster parents, step-parents, guardians, employers, and youth workers.8Victoria Legal Aid. Age of Consent The list is broad, and courts examine the reality of the relationship rather than the job title alone.
Penalties are substantial. In New South Wales, sexual intercourse with a 16-year-old under the offender’s special care carries up to eight years in prison, and up to four years for a 17-year-old.7NSW Legislation. Crimes Act 1900 No 40 Victoria, the ACT, South Australia, and Western Australia set the maximum at 10 years. The Northern Territory sets it at 8 years.10Australian Institute of Criminology. Brief Review of Contemporary Sexual Offence and Child Sexual Abuse Legislation in Australia A conviction typically results in permanent disqualification from working with children.
Sexting and Intimate Images of Under-18s
The age of consent covers sexual activity, not images. Australian law treats intimate images of anyone under 18 as child abuse material, even where the person in the image took it themselves. A teenager who photographs themselves in a sexual way can technically be charged with producing child abuse material, and sending that image to someone else can be charged as distribution.11Australian Federal Police. Child Exploitation Maximum penalties for child abuse material offences can reach 15 years in prison, though that ceiling is reserved for the most serious cases.
In practice, police use significant discretion when dealing with teenagers. Warnings, youth justice conferencing, and school- or family-based responses are all used. Prosecution tends to be reserved for cases involving coercion, a significant age gap, or widespread distribution.
Some jurisdictions carve out limited protections. New South Wales exempts minors from prosecution for possessing child abuse material that depicts only themselves. Victoria offers a similar exemption and also protects the recipient where the sender was 16 or 17 and voluntarily shared the image with someone no more than two years older, provided the recipient did not distribute it further. South Australia exempts minors who possess self-produced images. The ACT provides a defence where the person had no reasonable grounds for suspecting the material was child abuse material.
These exemptions are narrower than many teenagers assume. Forwarding someone else’s intimate image to a third party has no exemption anywhere in the country.
Penalties and Sex Offender Registration
Maximum prison sentences for underage sexual offences rise sharply the younger the child. In New South Wales, sexual intercourse with a child aged 10 to 13 carries up to 16 years, or 20 years with aggravating circumstances; for a child aged 14 or 15, the maximum is 10 years, or 12 with aggravation.7NSW Legislation. Crimes Act 1900 No 40 Queensland goes to life imprisonment for offences against a child under 12, and up to 14 years for a child aged 12 to 15.3Queensland Government. Sexual Activity with Young People Aged 16 to 17 Other jurisdictions follow a similar pattern of escalating severity.
A conviction for a sexual offence against a minor does not end at the prison gate. Across Australia, people convicted of registrable offences are placed on the sex offender register and must report details including home address, workplace, vehicles, and interstate or overseas travel plans to police for a set period, or indefinitely in serious cases. Registration also brings ongoing restrictions on where a person can live and work and on their contact with children. After a set period, a registered person can apply to have their name removed, though approval is not guaranteed. For the most serious offences, registration is effectively lifelong. This consequence can follow convictions arising from sexting cases, position-of-trust breaches, or close-in-age situations where no defence applies.