The Prime Minister said he "didn't accept the premise" of a question on Wednesday about the walk-back from $67 billion to $32 billion and insisted "the onus is on the Labor Party" to explain how it would make up the budget shortfall. Prime Minister Malcolm Turnbull travelled on the Puffing Billy railway with local member Jason Wood and Senator Richard Colbeck on Wednesday. Credit:Andrew Meares "We have set out a budget which includes all of our revenue and expenditure, of course, over the next four years. We have demonstrated that. Everything is paid for," he said. "What the Labor Party is doing is every day Bill Shorten is turning the spend-o-meter as he calls it every day, he thinks it's very funny. I don't think taxpayers think it's very funny. He is spending more money every day." Asked directly if the black hole was $67 billion or $32 billion, Mr Turnbull said "can I say that is a question you should be addressing to the Labor Party and the Labor Party have to make a choice".

"Well, $67 billion is the list of the measures that they [Labor] have either blocked or proposed or said they want us to roll back." The errors contained in the government document relied on by Mr Morrison and Finance Minister Mathias Cormann calculated $35 billion worth of contested measures, which the government claims Labor has previously committed to. In a separate section of the same document another $30 billion worth of Labor promises to date is also counted. But the $35 billion figure includes $19.27 billion on foreign aid when the opposition says it will spend $800 million - the figure that caught out the Treasurer on Tuesday. Mr Turnbull said that "if what Tanya Plibersek is saying, that Labor is now backing at least 90 per cent of our reductions in foreign aid, she should say that". Labor has confirmed the $800 million in additional money for aid and aid agencies is its final spending commitment.

And the $30 billion in Labor promises figure includes nearly $10 billion more in contestable figures, including: a $200 million promise over funding for the Ipswich Motorway, which the Liberals have also made

a $6.7 billion assumption that Labor will lift the superannuation guarantee to 12 per cent by 2020, not 2025

$4.39 billion attributed to Labor opposing the government's super package, when Labor actually opposes about $2.4 billion worth The government has added the $30 billion and $35 billion to the $18 billion in so-called "zombie" measures stuck in the Senate and flagged in the pre-election budget update and to make an $83 billion "black hole" - less the $16 billion in revenue measures Labor has announced - to get the $67 billion figure. But if you subtract the contested $35 billion - which includes the $19.27 billion foreign aid mistake - and nearly $10 billion from the $30 billion of promises, that means the black hole is nearer to $22 billion, not $67 billion. And $18 billion of that $22 billion are the so-called zombie measures, which the government has been unable to pass through the Senate, but which the independent departments of Treasury and Finance included in the budget update last Friday, in line with usual practice.

Labor, for its part, has promised it will reveal its final costings before the end of the lengthy campaign and pressure is sure to build on the opposition to explain its costings. Follow us on Twitter Follow James Massola on Facebook