Tony Abbott says the Opposition will only submit its policies for costing by Treasury if the culprit of an election campaign leak against the Coalition is found.

The three independent MPs who are expected to hold the balance of power in a hung parliament included the demand for Treasury briefings in a list of seven conditions which they say need to be met to guarantee their support.

During the election campaign the Opposition refused to submit its policies for costing because a Treasury document which revealed a shortfall in one of its polices was leaked to the media.

Mr Abbott yesterday again refused to hand over his policies, drawing the ire of independent MPs Tony Windsor and Bob Katter, who said it looked like the Opposition Leader had something to hide.

Speaking on ABC's AM program this morning, Mr Abbott said the Coalition would only submit its costings when the investigation into the leak was completed.

"Until it is resolved we can't have confidence in the integrity of process," he said.

"[The leak] was sheer political bastardry, practised by this Government in a desperate attempt to cling to power."

The independents also want to see the advice prepared by public servants for the new government on how it will implement its plans.

But Mr Abbott also opposes this demand.

"You cannot have the frank and fearless advice of the public service prejudiced by releasing it to people for whom it was never intended," he said.

Treasurer Wayne Swan says the Government will provide the independents with any information they need to decide who they will support to form a minority government.

"I think in the circumstances they are in that is entirely legitimate," he told Radio National.

"This is a unique situation."

The independents have also demanded that the party that comes to power must serve a full term, which Mr Abbott and Ms Gillard have agreed to.

When asked whether Labor could commit to not rolling a prime minister Mr Abbott replied: "The prime minister has made that commitment."

Labor and the Coalition are now both locked on 71 seats, with three still in doubt as counting continues.