BofA Warns of Hong Kong Rate Spike Risk on Divergent Fed Outlook

Bank of America has issued a warning that Hong Kong's interbank market is primed for a "sharp repricing," with borrowing costs potentially spiking if the U.S. Federal Reserve pursues a more aggressive rate-hiking path than currently anticipated by investors.

Divergent Rate Expectations

According to an analysis from Bank of America, Hong Kong dollar (HKD) rates currently trade approximately 100 basis points below the U.S. Secured Overnight Financing Rate (SOFR). This gap reflects market expectations of persistent excess liquidity in the city's banking system.

However, the bank's economists project three additional Federal Reserve rate hikes this year, a more hawkish stance than the one to two increases currently priced in by the market. This divergence could significantly widen the interest rate differential between the U.S. and Hong Kong, putting pressure on the local currency.

Intervention Risk and Market Impact

A wider rate differential would likely push the USD/HKD exchange rate toward the weak end of its permitted trading band at 7.85. Such a move would probably trigger intervention from the Hong Kong Monetary Authority (HKMA) to defend the currency's peg to the U.S. dollar.

BofA notes that the financial system is more vulnerable to this scenario compared to previous Fed tightening cycles due to a smaller liquidity buffer. The city's Aggregate Balance (AB), a key measure of interbank liquidity, is lower, providing less of a cushion before HKMA intervention would drain cash and force rates higher. The bank projects that overnight HIBOR could surge to 6% if the HKMA acts at current AB levels.

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Historical data highlighted by the bank shows this sensitivity:

• When the Aggregate Balance falls below HKD 50 billion, funding costs tend to rise significantly.
• When the AB is above HKD 200 billion, overnight HIBOR typically remains near zero.

Context and Caveats

Bank of America suggests any potential spike in the Hong Kong Interbank Offered Rate (HIBOR) may be short-lived, citing structural features like persistently low loan-to-deposit ratios in the city's banking system.

Analysts also identified several risks that could prevent this scenario, including a sudden unwinding of carry trades or lower-than-expected U.S. inflation data that convinces the Federal Reserve to keep rates on hold.