The leading opposition figure tasked to shot down the $43 billion national broadband network may be barking up the wrong tree as revelations came out that he also maintains considerable interest in an IT firm set to benefit from the project's roll out.

Federal Treasurer Wayne Swan accused the Coalition of hypocrisy for fielding Malcolm Turnbull as its frontman in demolishing the NBN while at the same time allowing him to possibly gain profit in the federal project they profess to despise.

In a Fairfax Radio interview, Mr Swan revealed that the opposition communications spokesman holds up to $10 million worth of shares in Melbourne IT, which he said is poised to benefit in the NBN project.

The discovery, according to Mr Swan, effectively took out the strength of the opposition's arguments against the NBN and rendered Mr Turnbull's posturing against the federal project as mere lip service to the Coalition's political stand.

Mr Swan said that by not divesting his interests in the technology firm prior to his designation as the frontbencher in the opposition's quest to discredit the NBN initiative, Mr Turnbull unveiled his real stand on the issue and that is to also make a killing on the government project.

According to Mr Swan, it turned out that Mr Turnbull is merely acting on his role as opposition leader Tony Abbott's mouthpiece effort in discrediting the NBN project while at the same time he is personally convinced that the federal initiative is economically viable.

Also, Mr Swan clarified that the federal government is still waiting for the official advisory from the Australian Competition and Consumer Commission (ACCC) on questions of interconnection points for the NBN, which should be forthcoming by the last part of November.

Considering that, the deputy prime minister said that revealing the business plan for NBN would be tantamount to fiscal irresponsibility as the public would only be able to appreciate an incomplete and inconclusive blueprint for the project.

He gave assurance though that once inputs from the ACCC have been delivered, the cabinet should be able to immediately act and decide on the plan yet "until we do that you simply cannot release it, it wouldn't be responsible."