September CPI: Headline Inflation Runs at 3.74%, Core at 2.56%
The Consumer Price Index tracks inflation by measuring changes in prices for goods and services that households purchase. Medical care and housing have been among the fastest-growing categories since 2000. In September 2026, headline CPI rose at a 3.74% annualized rate, while core CPI increased 2.56%.
The Consumer Price Index serves as a key gauge of how prices for household goods and services change over time. Since 2000, medical care and housing have ranked among the fastest-rising components, with each climbing by more than 100% over that period.
In the index's latest weighting from December 2025, energy accounts for 6.297 of every 100 units of relative importance. College tuition and fees carry a 1.351% share of total expenditures. For September 2026, headline CPI's annualized change was 3.74%, while core CPI's was 2.56%.
These inflation readings could affect households, retirees, borrowers, and savers as they plan budgets. If medical care and housing continue to outpace other costs, families may devote larger shares of income to essentials, potentially reducing discretionary spending. Core CPI may also shape expectations for interest rates and borrowing costs. Investors and policymakers may watch the figures closely, though actual effects could depend on wages, employment, and broader economic conditions.