Opposition Leader Tony Abbott has had a change of heart and will use new figures from Treasury and Finance as the basis for his election costings.
The two departments will release their independent assessment of the budget and economy in the Pre-election Economic and Fiscal Outlook (PEFO) on Tuesday.
Previously the coalition has raised its concerns about the authenticity of the PEFO numbers.
But Mr Abbott clarified his position on Friday.
"This government has got all of its figures wrong. It's never got a figure right, never got a forecast right," he told reporters in Brisbane.
"The best estimate going will be PEFO. Hopefully it will be more accurate than previous figures and we'll obviously be working off the PEFO figures."
Treasurer Chris Bowen said this was just more "confusion and chaos" from the Liberal party and it contradicted statements made by Mr Abbott's own shadow treasurer just days earlier.
Shadow treasurer Joe Hockey had said the government's figures can't be relied upon.
At the same time, Mr Bowen said the Reserve Bank of Australia's (RBA) latest forecasts were "entirely consistent" with the government's own outlook.
The RBA released its quarterly statement on monetary policy on Friday, which included trimming its 2013/14 growth forecast to 2.5 per cent, in line with the government's latest economic update.
The central bank said the economy can be expected to grow a little below trend through to mid-2014 with non-mining investment growing only modestly.
At the same time, the completion of a number of mining investment projects will see mining investment decline.
Prime Minister Kevin Rudd said Labor had a clear plan to keep the economy strong, grow jobs and assist where it can with cost of living pressures.
He has no plans to change the minerals resource rent tax despite revenues not living up to initial expectations.
"I am very concerned about the current state of the global economy and proposing a new tax change to the mining industry now the China mining boom is coming off," he told reporters in Melbourne.
But Mr Abbott said the prime minister had "done his best to kill" the China boom with bad policies like carbon pricing and the mining tax.
He also said it was governments of the past 25 years that saved Australia from the global financial crisis, not Mr Rudd.
Many industrialised nations fell into recession during the 2008-2009 crisis, but not Australia.
"What saved Australia from the global financial crisis was good economic management over the previous 25 years, sensible economic reform over the previous 25 years," Mr Abbott said.
Meanwhile, Mr Rudd continued to warn voters that an Abbott-led government would raise the 10 per cent GST rate or extend it to food, despite repeated denials this week from the coalition.
Based on a higher rate of 12.5 per cent, the price of a carton of eggs would rise by 77 cents, a $4.17 jar of Vegemite would cost $4.69 and two litres of milk would be 54 cents more.
Mr Hockey has said a coalition government plans a broad-ranging tax review that would take in the GST but any further proposals would be "taken to the people" at the following election.
