from This is Money (the Mail) Frosty warnings: HSBC has indicated it could follow RBS’ lead and charge for holding cash deposits
…A more extreme threat of negative interest rates cannot be ruled out following a warning to 1.3 million business customers from Royal Bank of Scotland, which also owns NatWest, about the possibility of having to charge for holding their cash deposits.
HSBC has indicated it could do the same, but it would only affect business customers who hold deposits in a foreign currency.