Tony Abbott has promised to detail the Coalition's spending and saving plans "well before polling day" as Labor attempts to paint the Opposition Leader as evasive.

Speaking to reporters in Queanbeyan ahead of Sunday's first election debate, Prime Minister Kevin Rudd said it was time Mr Abbott came clean on his plans for the budget.

Opposition Leader Tony Abbott defends his spending and savings measures at Bondi Beach, Sydney, on August 11.

"Based on today's polls, if there was an election yesterday Mr Abbott would be prime minister today and therefore he can't be evasive tonight about where his $70 billion in cuts in heath, education and jobs will fall," he said.