State Labor will boycott the Napthine government's proposed policy costings body for most of its election policies, describing the office as ''belated, insipid and comprehensively inadequate''.
Last month, the state government released a discussion paper on its proposed model for a parliamentary budget office, which would independently assess the cost of election promises and hold politicians to account for misusing its information.
But in a scathing submission to the government, the opposition said the proposed body was flawed because it only costed policies for the final three months of every four-year electoral cycle.
It said the timeline for the proposed body did not accommodate policy development by non-government parties, who would have to seek external costings advice. ''It cannot undertake a sensible, comprehensive or credible costing of non-government policy proposals during this timeline.''
Labor said it would not support any legislation for a parliamentary budget office that did not include a permanent office staffed by public servants who could give ''frank and fearless'' advice.
State Labor has announced policies on road safety, jobs and investment and the services industry more than a year before the state election, and will soon release its transport infrastructure policy.
It is understood these policies will not be submitted to the proposed office, which begins its ''defined costings period'' on September 1.
Minister for Finance Robert Clark said the office would provide an ''authoritative, independent and credible election costing service''.
He said the government would consider all feedback on the proposed model for the office, but said it was not designed to do Labor's homework. ''If Labor can't develop election policies without the help of a PBO, they will not be fit to seek to govern Victoria.''