Opposition Leader Tony Abbott has defended the Coalition's decision not to have two of its major policies independently costed, saying the measures are "bulletproof".

The Coalition will release the details of a final $10 billion in budget cuts and more policy costings this afternoon, after Prime Minister Kevin Rudd's National Press Club address, and barely a day-and-a-half before polls open on Saturday.

But Mr Abbott has confirmed that neither his Direct Action climate change policy nor the Coalition's broadband plan have been reassessed independently in recent months.

He says neither of them needs to be.

"The national broadband network policy was released many months ago by myself and Malcolm [Turnbull]," he said.

"The Government's been crawling all over it. No-one has been able to question the costings. It is absolutely bulletproof.

"On Direct Action, we released Direct Action early in 2010. It went to the Treasury in the post-election process. Again, Treasury found no fault with it. Another bulletproof policy from the Coalition."

In 2010, the policy was estimated to cost $3.2 billion over four years.

And in early April, the Opposition promised to build a fast broadband scheme within the next seven years at a cost of $29.5 billion.

Where the Coalition will save $31.5 billion Discontinuing the School Kids Bonus - $4 billion

Discontinuing the School Kids Bonus - Reducing public service head count by natural attrition by 12,000 - around $5 billion

Reducing public service head count by natural attrition by 12,000 - around Two year delay in phasing of superannuation increase from 9 to 12 per cent - $2.1 billion

Two year delay in phasing of superannuation increase from 9 to 12 per cent - Discontinue low income super contribution - $2.9 billion

Discontinue low income super contribution - Rescind increase in humanitarian intake - $1.3 billion

Rescind increase in humanitarian intake - Discontinue supplementary allowance to unemployed, students and parents - $1 billion

Discontinue supplementary allowance to unemployed, students and parents - Scrapping Clean Energy Finance Corporation - $1.6 billion

Scrapping Clean Energy Finance Corporation - Paid parental leave (PPL) scheme, which would replace existing programs - $1.1 billion

Paid parental leave (PPL) scheme, which would replace existing programs - Abolition of Minerals Resource Rent Tax (MRRT) and associated costs - nearly $5 billion

Abolition of Minerals Resource Rent Tax (MRRT) and associated costs - Dumping carbon tax, which would include ending associated programs - $7.5 billion (Estimated savings over four years of forward estimates as released by the Coalition.)

Chris Bowen says 'transparency is non-existent'

Treasurer Chris Bowen sys he is not expecting much detail out of this afternoon's costings release.

"The transparency here is just non-existent," he told Radio National.

"They will not be releasing their detailed costings, they will not be releasing, from what I read, a detailed budget bottom line.

"They're failing the basic test of an alternative government."

Mr Bowen also hit out at the timing of the announcement.

Throughout the campaign, Mr Abbott has said the figures would be released "well before polling day" or "in good time" before the election.

Mr Bowen says that promise has been broken.

"Thursday is not good time and it's certainly not good time if we don't see the full details," he said.

Mr Abbott says treasury spokesman Joe Hockey and finance spokesman Andrew Robb will release the numbers later today in Melbourne, while he is campaigning in Brisbane.

"I'm campaigning in Brisbane - that's my job to be campaigning in Brisbane," he said.

"I may not be with them but I'm certainly there with them in spirit, this is a joint release as it were.

"It's something that we're doing as a Coalition team."

Mr Hockey is expected to say the Coalition is not presenting an alternative budget, but will reveal its full savings and spending measures.

The Opposition has previously said it will not be providing a budget bottom line and will allow voters to "do the arithmetic".

Mr Hockey will say the budget will be $6 billion better off over the forward estimates under a Coalition government and debt would be paid down by $16 billion over the period.

The Parliamentary Budget Office (PBO) has found there would be a $1.1 billion improvement in the budget because of growth attributed to scrapping the carbon tax, but the Coalition says it is not including that money in its savings.

The Opposition has already announced $31 billion in savings over four years, but Labor has focused much of its attack during the election campaign on the Coalition's delay in revealing its costings, accusing it of failing to abide by the Charter of Budget Honesty.