Customers are chasing higher-rate products. That’s bad news for banks like HSBC.

HSBC shares fell as much as 7% on Tuesday after the lender disclosed that customers are increasingly shifting deposits into higher-rate products. The move reflects a pattern familiar across banking: when interest rates rise, savers become more sensitive to the yield they earn and move money out of low-paying accounts into alternatives that offer better returns.

For banks, this shift matters because deposit funding is a core part of how lending is financed. When customers migrate to higher-rate products, the cost of that funding rises, which can pressure net interest income—the gap between what a bank earns on loans and what it pays on deposits. HSBC's share reaction suggests investors see this trend as a meaningful headwind to earnings.

What to watch: whether this deposit migration is a one-off adjustment or a sustained trend, how quickly other banks report similar shifts, and whether lenders can offset higher funding costs through pricing or lending margins. For observers of the sector, HSBC's disclosure offers an early signal on how rate-sensitive customer behavior is reshaping bank economics.