Instead of only government departments and state-owned undertakings, the CAG can now audit private companies, too.
Its recent audit reports on allocation of radio frequency for telecommunications and coal mines have led to the removal of a minister, cancellation of coal blocks and a series of inquiries by the Central Bureau of Investigation.
As the dust over the expansion of the CAG's ambit settles down, initial fears of intrusive corporate oversight appear exaggerated.
Vinod Rai, former CAG, who pushed for audit of private companies, says the Supreme Court order is only an enabling clause.
"It will be an audit done on rotation -- pick and choose -- wherever there is a need for an audit."
In 2010, for instance, the department of telecommunications had asked the CAG to audit revenue sharing between the Centre and telecom licence holders.
"An audit by the CAG is to identify whether a company has paid or provided all sums due for use of resources controlled by the government," says N Venkatram, managing partner, Deloitte Haskins & Sells, an audit, tax and consultancy firm.
A general audit of a financial statement, on the other hand, bases itself on the auditor's assessment of the risks of material mis-statements.
The nature, timing and extent of such audits are planned and performed to address such risks and provide an opinion the financial statements are true and fair.
"The techniques (of a CAG audit) will be focused towards detecting understated or undisclosed amounts that could result in loss of revenue to the government.
It will not be unreasonable to expect that the CAG audit will be carried out under the presumption that there is an understatement of amounts due to the government," says Venkatram.
A CAG audit will be specific to a set of transactions of a company, say, revenue share on roaming charges in telecommunications.
But companies need extra resources to support the exercise, increasing the cost of complying with government contracts.
Tata Power Delhi Distribution Ltd earlier this month said it was putting in extensive man hours to cater to the queries by auditors about its power distribution business in Delhi.
Companies will also have to defend their costs. Reliance Industries on November 3, 2012, went to the extent of stating it "welcomes comments on operational matters if such comments come
Delhi govt may go for CAG audit of private power companies
Economist close to Modi lists 3 reforms for the new govt
Jaitley to bank on states to push GST
World Cup warm-ups: France, Japan and U.S. start with wins
Blasts have to stop so that voices can be heard: Sushma to Pakistan