Labour will release details of its policy funding later today after being under fire from the Government for a week.
Party leader Phil Goff has been on the back foot as National piled on the pressure, saying its election promises would cost $17.2 billion, which would have to be borrowed.
During a debate on Wednesday night Prime Minister John Key challenged Mr Goff to explain how Labour would raise the money.
Mr Goff didn't respond, and "where's the money, Phil" became a campaign catchcry.
National's campaign manager Steven Joyce, who calculated the $17.2 billion, says he used standard Treasury models to figure out how much 16 promises would cost.
"Three weeks out from an election, New Zealanders will be appalled that the Labour leader doesn't know how his party will pay for its promises," he said on Thursday.
It's that sort of attack that Labour is hoping to shut down by releasing details of where the money will come from.
The announcement is scheduled for noon on Friday.
NZN