Vietnamese Banks Face Mismatch After 3 Months

For investors, that is the key risk to earnings quality. If borrowing costs or policy rates stay elevated, the first bucket gives banks some near-term cushion, but the later buckets point to slower pass-through on loan yields and faster repricing on deposits and other funding. That combination can compress net interest income, especially for lenders with large short-term funding books and longer-duration loan assets.

The shift is broad, not isolated. Twenty-two of the 30 banks moved from positive in the one- to three-month bucket to negative in the three- to six-month bucket. ACB posted the biggest swing, from a positive 550.5 trillion dong to a negative 224.8 trillion dong. Agribank, SHB and Sacombank also flipped sign, while MB, TPBank, ABBANK, VPBank, Nam A Bank, NCB, PVcomBank and Bac A Bank did the same. By June 30, banks still carried a cumulative positive gap of about 2.64 quadrillion dong within three months, but that advantage shrank sharply as maturities extended.

Economically, this is a funding-structure story. Roughly 80% of bank funding is short-term while close to half of lending is medium- to long-term, so the system is built on a maturity transformation that works best when rates are stable. Once rates move, the repricing lag becomes the profit lever or the profit trap. A bank with assets that reset faster than deposits can expand margins in a rising-rate environment; a bank with liabilities that reset first can see funding costs jump before loan income catches up.

That is why the benchmark rate backdrop matters. U.S. two-year Treasury yields are around 4.88% and 10-year yields near 5.19%, while U.S. high-yield spreads remain contained around 2.8 percentage points. The macro signal is not one of easy money. In that setting, every banking system with a duration mismatch has to defend spreads aggressively. Globally, lenders from Bank of America to JPMorgan and Citi all devote heavy disclosure to interest-rate sensitivity for the same reason: the earnings impact can turn quickly when the curve moves.

For Vietnamese bank investors, the practical takeaway is to favor lenders with stronger deposit franchises, more flexible loan repricing and tighter asset-liability management. Those institutions are better positioned to protect margins if the rate cycle stays sticky. Banks relying heavily on short-term wholesale funding or slower-reset loan books are the ones most exposed to the three- to six-month rollover wall.

The market is still pricing banks as if balance-sheet duration is manageable. Our view is that this mismatch is the real earnings catalyst to watch over the next two quarters. The first three months may look comfortable, but after that the numbers tell a different story: the repricing burden shifts to liabilities, and that is where margin pressure can surface fast.