Karen Kemp, executive director of banking policy for Hong Kong, said in the letter that any banks that facilitate tax evasion could be prosecuted for money laundering.
"Further, it goes without saying that [banks] should not market themselves or schemes operated by them as being available for this purpose or incentivise their staff (whether through payments or bonuses or otherwise) to engage in such conduct," Kemp said.
The letter comes in advance of tax-information exchange treaties that Hong Kong expects to work out with the U.S. and other countries.