Higher rates fattened RCBC’s lending spread. They also punished the value of its bond book. For banks, higher interest rates are both tonic and toxin. They can widen the gap between what a lender earns on loans and securities and what it pays depositors. But they can also bruise the value of bonds already sitting on the balance sheet. RCBC’s first-quarter 2026 results captured that paradox neatly. Yuchengco’s bank reported net income of ₱2.7 billion , up 11.6% year on year , as net interest income surged. Yet its total comprehensive income was only ₱223 million , sharply reduced by a ₱2.54 billion fair-value loss on debt instruments classified at fair value through other comprehensive income, or FVOCI . The profit-and-loss account told the cheerful half of the story. RCBC’s net interest income rose to ₱15.4 billion from ₱12.3 billion , an increase of about 25% . Its net interest margin improved to 5.2% from 4.8% , a substantial move in a business where margins are usually m...