The comments made by Stephen Hester, CEO of the firm, at a conference in London were reported by the Scottish Herald.
He told attendees at the event that many of the banks which struggled through the global credit crisis reliant on public money owe a debt of gratitude to the UK tax payer, the newspaper reported.
Mr Hester, who was quoted by the news provider, said: âYou just have to look at underlying banksâ financial strength ratings and their actual ratings and its undeniable that there remains a level of âsovereign haloâ applicable to banks.â
âThat there should be a bit of extra taxation seems to be pretty hard to resist,â he added.
His comments followed news of further redundancies among RBSâ workforce. which were unveiled by the bank earlier in the week.
Another 500 posts among back-office divisions are to be cut after RBS announced that 3,500 support positions were also to given up earlier in the year.
By Jim Ottewill