Queensland parents who supply their underage children with cartons of alcohol for schoolies celebrations and for parties will face fines up to $6,000.
The penalty is double that flagged by the government when it proposed an overhaul of liquor laws in a bid to tackle alcohol abuse and binge-drinking by young people.
Speaking outside the 2020 summit in Canberra on Saturday, Premier Anna Bligh told The Sunday Mail irresponsible parents and other adults who supplied underage teenagers with alcohol would be fined.
"This is not aimed at teenagers whose parents give them a sip of wine during a special occasion," Ms Bligh said.
"But when mum or dad buys a ute full of beer for teenagers, they need clearer guidelines on what's acceptable.
"In a time of growing concern about teenage binge-drinking, the law needs to be clear and unequivocal," she said.
Ms Bligh said the maximum fine of $6,000 was proposed for so-called "secondary supply" offences, as part of the wide-ranging reform of the Liquor Act that went before parliament last week.
The fine would apply to all adults who recklessly provided alcohol to teenagers or children.
"This is double the current $3,000 penalty for vendors who supply alcohol to minors in a public place and will apply to anybody who supplies liquor to a minor," Ms Bligh said.
It was the first time such an offence was recognised in Queensland, she said.