The bank is expected to reveal in next week's annual report the extent to which it has reclaimed bonuses paid to its staff in previous years to try to demonstrate to shareholders that it is heeding their calls for pay restraint.
The bank previously insisted it had cut the bonus pool (which still stands at £1.8bn) by the equivalent of the £290m fine for manipulating Libor. The Libor events forced out the chief executive, Bob Diamond, in July 2012.
Sky News calculated that on this basis the loss to staff, due to the penalty for rigging the key benchmark rate, was £450m – the total of the cut to the bonus pool over the £290m fine, plus about half of the £300m being clawed back from staff.
The remainder of the clawback is the result of provisions for PPI, which have in the past two years cost the bank £2.6bn, while the total cost of the mis-selling of interest rates swaps to small businesses has reached £850m.
Even before last year's Libor-rigging fine, Barclays' pay policies had infuriated shareholders, who staged a rebellion at last year's annual meeting when nearly a third of them failed to back the remuneration report.
The bank is keen to avoid a fresh revolt at this annual meeting after its report outlining directors' pay and the clawback provisions is published next month.
Barclays' new chairman, Sir David Walker, who replaced Marcus Agius in the wake of the Libor scandal, has already sanctioned a move to provide a break-down of numbers of staff falling within certain pay brackets.
This is expected to show that as many as 600 staff took home more than £1m in 2012, despite the clawbacks and attempts by the bank to show that it was cutting top pay.
Other banks are also expected to be forced to follow the disclosures on pay, including Royal Bank of Scotland which on Thursday is scheduled to publish the extent of its losses for 2012 when it also received a fine, of £390m, for rigging Libor.
Bailed out with £45bn of taxpayer money, RBS has already said its bonus pot has been cut by £300m, the part of its Libor fine that is being paid to the US authorities.
About 1,500 RBS bankers are also seeing their bonuses clawed back due to the Libor fine. The total size of the bonus pot for 2012 is expected to be in the region of £250m to £300m, down on the near £800m handed out the previous year.
Stephen Hester, chief executive of RBS, is expected to insist that the bank is on track to resume dividends in 2014 – for the first time since the banking crisis – despite the torrid performance last year.
Hester is expected to unveil a partial flotation of the bank's US arm Citizens to enable the bailed-out bank to focus more on its domestic market.
George Osborne, the chancellor, has called on RBS, a bank 82% owned by the taxpayer, to focus on UK small business, corporate and personal banking. He said on Monday that there would be "further progress this week" with regard to this UK-centric approach.
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