However when you are calculating LTVs and RWAs and PDs against bubble valuation levels, are they still appropriate? If you calculated it against replacement costs, the LTVs would go through the roof, and so would RWAs and the banks would be left with an CET tier 1 equity deficit to be covered by a rights issue. Any losses and higher RWAs on impaired loans would further cost equity.
So Hong Kong real estate which yields 1-3% rental yields in many cases, vs a Prime lending rate which is 5.15% is an enormous, negatively carrying bubble, propped up by speculation and Chinese capital flows.
HSBC is the 800lb gorilla in a banking system where M3 is >5x GDP.
M3 and Household debt to GDP:
Here are some excerpts from HSBC's financials and Pillar 3 statements for Dec 18.
HSBCs 2018 AFS. $300bn plus exposure to HK and China.
Downside risk scenario involves small house price drops and ongoing economic growth.
Trade exacerbated downside drives a greater slowdown in 2019 only with recovery in H2-20.
$55bn of Category 3 loans to wholesale borrowers. Category 3 typically has a 100% RWA under Basel III.
$58bn of CRE, $2bn impaired
About $15bn in higher LTV wholesale loans:
$108bn in personal loans, of which about $3bn are impaired
About $25bn in loans above 51% LTV
However most of their book has RWA charges determined by their Internal Ratings Based approach:
Using their IRB approach retail mortgages have only a 0.7% probability of default and a few percent of loss given default. They calculate a 20% RWA charge against this.
Wholesale loan PDs are also under 70bps and seem to be applying a 30% RWA charge.
Only by IRB derived models and applying low PDs and low LDG rates have they been able to book these loans at 20 or 30% RWA levels and as such 'Category 1 loans'. But Category 3, 4 or 5 loans carry 100% or 150% RWA charges. So any large falls in property prices and rise in PDs will absorb a lot of CET1.
As a reminder after the 1997 bubble imploded the Hong Kong residential index dropped from 172 to 59 between 1997 and June 03, a 66% drop in nominal terms and more in real.
And remember the prime lending rate is 5.15% and property yields 1-3%. Well they have 3 year interest deferred ARM mortgages to resolve for that.... I wonder if any of HSBC's wholesale loans book is against such loans?