According to a Bloomberg report, letters have been sent to nearly 800 clients informing them that their tax affairs over the past 20 years will be investigated.
The tax authority will write to an additional 4,500 HSBC clients, giving them the choice of either making a full disclosure or face investigation, the report added.
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The details of the Swiss bank accounts, dating back to 2005 and 2006, were passed to HMRC by its French counterparts after Herve Falciani, a former software technician at HSBC in Geneva, stole details on at least 24,000 accounts.
The latest probe comes after Switzerland and Britain struck a deal last month to tax money kept by British residents in secret Swiss bank accounts.
Under the agreement, customers must either make a declaration to HMRC or pay a withholding tax that also covers their past failure to disclose undeclared assets.
Last month, HSBC’s Swiss unit chief executive Alexandre Zeller, reportedly said that first-half outflows from European clients had been "considerable", in part due to the data theft incident.
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By GlobalDataDue to the strong Swiss currency, the bank’s profit before tax fell 34% from a year previously to CHF248 million and assets under management fell by CHF9.4 billion to CHF177 billion.
