Sri Lanka's central bank delivered a sharp and unexpected blow to financial markets on Tuesday, raising its benchmark overnight policy rate by 100 basis points — to 8.75% from 7.75% — as policymakers moved aggressively to rein in inflation and halt the slide of the rupee. The move, announced on 26 May 2026, was the Central Bank of Sri Lanka's (CBSL) largest rate increase since March 2023 and caught most analysts off-guard: seven of twelve economists polled by Reuters had forecast a rise of only 25 basis points or marginally higher.

The rate hike is a direct response to the economic shockwaves radiating from the ongoing U.S.-Israeli war with Iran, which has sent global energy prices sharply higher. Sri Lanka, a small island nation in the Indian Ocean that is entirely dependent on imported fuel, has been hit particularly hard. Fuel prices have risen 40% and the government has introduced rationing measures, including declaring Wednesdays as public holidays to reduce energy consumption. Annual inflation has more than doubled in two months, climbing from 2.2% in March to 5.4% in April — though still far below the 70% peak recorded during the country's devastating 2022 financial crisis, when a severe shortage of foreign currency led to widespread shortages of food, medicine, and fuel. The rupee has lost 8.7% of its value against the dollar since early March, though the CBSL noted that depreciation pressures have eased somewhat in recent days.

The scale of Tuesday's hike signals a deliberate change in direction.