The US annual inflation rate accelerated to 3.7% in September 2026, up from 3.4% in each of the previous two months, and above market forecasts of 3.6%. The energy index increased 20.4% and the food index increased 2.5%. On a monthly basis, the CPI went up 0.6%, marking its largest gain in five months, compared to 0.4% in August and in line with forecasts. The index for gasoline rose 9.1%, accounting for over half of the monthly all items increase. Meanwhile, annual core inflation rate went up to 2.6% from 2.4%, more than forecasts of 2.5% while monthly core CPI inflation steadied at 0.3%, the same as in August and defying forecasts it would slow to 0.2%.