The federal government insists it has no case to answer over a critical audit of its carbon tax advertising campaign.
The campaign contained facts that were not properly sourced and seven breaches of financial management regulations, an investigation by the auditor-general has found.
The Clean Energy Future advertising campaign ran last year in the wake of an agreement between the government, independents and Greens to a carbon pricing scheme to start on July 1, 2012.
Assistant Treasurer Mark Arbib says Labor established tighter guidelines for taxpayer-funded advertising after coming to power in 2007.
'From my understanding of the ANAO (Australian National Audit Office) report, there is no case to answer,' he told reporters in Canberra on Thursday.
Senator Arbib took a swipe at the coalition, citing the Howard government's record on advertising.
'When the Liberal Party was last in office they spent over $100 million on Work Choices ads,' he said.
'So they have absolutely no credibility whatsoever when it comes to government advertising.'
Opposition climate action spokesman Greg Hunt said the audit findings were not a surprise.
'It was the use of public funds for a purpose which the public opposed and was therefore treated with scepticism by the public,' he told ABC Radio.
The campaign was designed to give the public the impression there would be benefits to the economy, when it was going to cost $600 to each worker by 2020.
'Those facts were not included,' Mr Hunt said.
