Lloyds and NatWest were down 2% or more in early trading on 16 October, with Barclays also slipping, ahead of the Budget on 28 October.
A Guardian report says Chancellor John Healey is considering reversing Jeremy Hunt's cut to the bank surcharge from 8% to 3%, a surcharge that currently raises just over £1bn a year.
Paul Nowak said reversing the cut would raise £2.25bn a year, and the TUC says a 16% rate could raise £24bn over four years.
UK Finance, Andrew Griffith and the CBI's Louise Hellem argue that a bank tax rise would weaken competitiveness and discourage investment.

UK bank shares fell on 16 October after reports that Chancellor John Healey may raise taxes on the sector in his first Budget, due on 28 October. Lloyds and NatWest were down 2% or more in early trading, and Barclays also slipped. The moves followed a Guardian report that Healey is considering reversing former chancellor Jeremy Hunt's cut to the surcharge banks pay on their profits, from 8% to 3%. The report did not say whether a final decision had been made.
Healey is looking for ways to raise revenue and keep the deficit under control while government borrowing costs have climbed sharply. The surcharge currently raises just over £1bn (€1.18bn) a year. Analysts covering British banks have said an increase is likely, with a return to 8% and a smaller rise of two or three percentage points both seen as options. Two British bank chief executives told Reuters they did not expect any increase, arguing that such a rise could curb lending.
Healey spoke to reporters on Thursday, 15 October, in Bangkok, at the IMF's yearly meeting. He said he had budget decisions to take and would take them, and he insisted his comments were not a steer on any tax changes. Asked whether higher bank taxes could be offset by lower capital requirements, he declined to be drawn into budget speculation. In a Bloomberg Television interview he described banks as a part of the jewel in the British economic crown.
He argued that the public misreads the sector.
“My observation on the banks is that people too often see them as big, distant financial institutions”
Paul Nowak, general secretary of the Trades Union Congress, backed reversing the cut and calculated that it would raise £2.25bn a year. He attributed the sector's profits to high interest rates and pressure on households' mortgages.
“Britain's big four banks are making a billion pounds a week, while bonuses have hit a post-crash record.”
The TUC wants the surcharge raised to 16%, which it says could bring in £24bn over four years, and it claims the Treasury has lost £6bn through the previous bank tax cut. The Institute for Public Policy Research recommended £1bn from a temporary surcharge on banks' windfall profits, within a package of £16bn to help struggling households. It estimates the Chancellor's fiscal buffer has dropped by up to £15bn since the spring.
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On the other side, UK Finance, the banking trade body, said an increase would weaken the UK's competitiveness and discourage investment and job creation. Andrew Griffith, the Conservative shadow chancellor, said a raid on financial services would stifle growth. Louise Hellem, chief economist at the Confederation of British Industry, urged the Budget to avoid sector-specific taxation, noting that business tax already makes up a record share of receipts.
Healey's remarks in Bangkok came first, on 15 October, and the share falls followed on 16 October. The Guardian report landed in the same window, without a confirmed decision. Healey has said he will take decisions in the Budget, which is set for 28 October. Until then the surcharge options stay open, from a return to 8% to the 16% the TUC wants.
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Lloyds and NatWest led falls on the FTSE 100 on 16 October after a Guardian report said the Chancellor is considering reversing a cut to the bank surcharge before his Budget on 28 October.
AI text based on reports by LBC, Bloomberg Business, The Telegraph and other publishers. Changed .