It is alleged that representatives of HSBC India, which has employees based in America, assured customers that details of their accounts would not be reported to tax officials.
The latest revelations came even as the bank issued full- page advertisements in British newspapers as a public apology after reports that its Swiss banking arm had helped some wealthy clients avoid tax.
According to court documents seen by The Sunday Times, employees in one case allegedly advised a New Jersey Indian- origin businessman to transfer funds in tranches of under 6,500 pounds to "stay below the radar".
The American justice department issued a summons against the bank in April, 2011 to reveal details of clients.
It was claimed that the bank promoted its services on the basis of keeping information secret from the tax authorities.
"Prospective clients were told that, as a foreign bank, HSBC India would not disclose the accounts to the IRS (Inland Revenue Service)," the government said in court filings.
"The IRS has learnt that thousands of United States taxpayers with accounts at HSBC India may have failed to disclose those accounts, and report income on them, as required by law," it said.
In a separate prosecution, unnamed HSBC India banking officials were alleged co-conspirators in the case of Arvind Ahuja, a neurosurgeon from Wisconsin who allegedly hid 5.5 million pounds in secret offshore HSBC accounts and filed false tax returns.
It was claimed Ahuja and HSBC officials used "undeclared accounts in Jersey, India and other countries for the purpose of concealing income from the IRS".
Ahuja was fined 222,000 pounds and ordered to serve three years probation.
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