Prime Minister John Key says National is likely to outline "a broad sense" of the conditions needed for tax cuts before the election, but no specific details.
Speaking to reporters in Blenheim today, he said voters would not be given any details of how much they might save a week under potential tax cuts before polling day.
But they would be told of the conditions that would be required for Government to cut taxes.
"Everyone acknowledges that things are tight. The question here is do we have any room to move at all and that's something we're working on."
He said tax cut programmes required consideration of numerous variables.