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This has to be one of the weirdest story ever in banking regulatory matters. (Quick thread)
Last night, Coventry Building Society, a conservatively run UK bank with approx 40bn of loans, said it had miscalculated its Risk Weighted Assets.
ouuuuuh, scary you might think! Didn't it happen with Metro Bank ? And after that they were in a big s***, even unable to issue SNP debt ?
Well, before you run to get your deposit bank from the bank, I should point out that there CET1 ratio will go down because of this from...34.2% to 32.6% 😂 So pretty much still three times what's required. No worries there.
What's funny is this: they admitted what they got wrong. And tbh it's hilarious (well, for bank capital geeks anyway.) Here's the formula to calculate RWA in the Capital Requirement Regulations
Yuk, ugly formula! Surely anyone can be wrong when using it, so many complicated functions. But no no no, what they got wrong is only this: they forgot to multiply by 1.06 (the scaling factor at the very end of the formula). And they did that for every single exposure they had 🤪
So these guys have been using IRB models for more than 10 years, with the approval of the Bank of England, which of course performs regular checks on the models etc....
And no one ever realised that they had forgotten the 1.06x !!! Just thinking of the face of the intern who probably realised this .....
(God so many typos, sorry. "your deposit back" and "that their CET1 ratio")
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