The South Australian opposition says it will move to ban election donations to political parties if it wins the March state poll.
The proposed ban would apply to individuals, businesses, unions and other organisations.
Opposition Leader Peter Malinauskas says if elected, Labor will commission the Attorney-General's Department to undertake a detailed analysis of the issues involved and provide policy guidance.
The solicitor-general will also be engaged to provide advice on potential legal challenges while Labor will reach out to Liberals and crossbench MPs to secure bipartisan support for the reforms.
"There is no doubt there is diminishing confidence among the public in our democratic systems," Mr Malinauskas said.
"If we can do one thing to improve public confidence in our public institutions, it is this - we should ban all donations for elections.
"No more private money for political parties' campaigns, not business money, not union money."
But Premier Steven Marshall described Labor's proposal as "just another thought bubble" from the opposition leader.
"The reality is we do have donation legislation in South Australia. It's fairly controlled and it's highly transparent," Mr Marshall said.
Under SA's current laws, political parties and candidates must create a designated account for election campaigns.
All donations must be paid into the account and all political expenditure must be made from the account.
All donations, gifts or loans over $5310 must be disclosed to the SA electoral commission.
There are also spending caps for election campaigns of $100,000 for each candidate in the state's lower house while all candidates and parties receive public funding based on the percentage of the vote they attract.
South Australia will go to the polls on March 19.
Australian Associated Press
Sign up for our newsletter to stay up to date.