Transaction banking curbs foreign deposit flight at Japanese G-SIBs
Expanding transaction banking operations reduces depositor attrition and lowers foreign currency funding costs for Japanese megabanks, a Bank of Japan study finds. The analysis shows that recent dollar deposit growth relies primarily on existing non-Japanese clients.
Operational accounts secure sticky balances
Analyzing transaction-level data collected with the Financial Services Agency across more than 2.6 million records, researchers found that non-interest-bearing transaction deposits substantially lengthen client tenure.
While dollar deposit growth at the three Japanese global systemically important banks has been driven by existing non-Japanese clients in the Asia-Pacific region, large depositors remain prone to rapid attrition.
Econometric estimates reveal that clients holding higher shares of operational transaction deposits exhibit significantly lower exit rates during financial stress and allow banks to secure wider deposit spreads against benchmark funding rates.
Surplus yen offsets dollar shortfalls
Japanese megabanks maintain overseas lending exceeding 30 percent of their total loan books, but face persistent structural deficits in retail foreign currency deposits abroad.
Banks historically bridged this gap through corporate bonds and medium- to long-term currency swaps funded by surplus domestic yen.
However, shifting domestic interest rates and market volatility are tightening domestic funding buffers, forcing lenders to compete aggressively against foreign peers for commercial deposits.
A costly moat to build
Building global transaction banking infrastructure is an expensive long-term wager that cannot quickly replace swap lines.
Megabanks remain highly exposed to rate-sensitive wholesale depositors who exit at the first sign of market distress.
Without an established overseas corporate network, funding stability will remain precarious.