India, July 4 -- In what could be a mega scandal, the Comptroller and Auditor-General (CAG) has unearthed under-invoicing of revenue to the tune of over Rs45,000 crore by six telecom companies from 2006 to 2010. The CAG submitted a related report to the President's Office and the Ministry of Finance in mid-February. The report, which is expected to be tabled in Parliament during the Budget Session, says that due to this massive under-invoicing, the exchequer lost more than Rs12,000 crore in taxes, that does not include penalty for tax evasion.

Given the go-ahead by the Supreme Court and the Delhi High Court, the CAG audited the revenue and expenditure receipts of Airtel, Vodafone, Reliance Communications, Idea, Tata and Aircel.

The audi...