Big
banks can use their own models to determine how much to set
aside against mortgage defaults, while smaller lenders must use
the regulator's guidelines, which typically means holding more
capital.
A simpler but still robust capital regime for smaller banks
could promote competition, Sarah Breeden, the BoE's executive
director for UK Deposit Takers Supervision, said.
"We are considering, in particular, whether there might be scope
to introduce a new regime for smaller banks following Britain's
departure from the European Union," Breeden said.
Her comments came in a speech released on Wednesday, as the
central bank published a consultation paper setting out a more
defined regulatory approach to new and growing banks, such as
simpler capital calculations.
Of the 22 new banks authorised since 2013, many seemed to have
underestimated what was needed to become successful, Breeden
said, adding that 20 more potential UK start-up banks were in
the pipeline.
Challenger Metro Bank is being investigated by the BoE over an
accounting scandal.
None of the new arrivals threaten HSBC, Lloyds, RBS and
Barclays, the four major banks that dominate mortgages, deposits
and business loans in Britain.
Breeden said the BoE had been reviewing how to reduce the
"unwarranted benefits" of using models, including "the
desirability of mortgage risk weight floors."
Not all banks want to become a big player given the extra
regulatory requirements they would face.
The UK arm of Goldman Sachs' Marcus digital bank closed to new
business in June to avoid reaching a threshold that would force
it to become a separate, ring-fenced entity, a costly
undertaking.
(Reporting by Huw Jones, editing by Louise Heavens and John
Stonestreet)
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