India's headline inflation declined to 1.5% in September 2025, compared with the FY2024-25 average of 4.6%. This is important for exam preparation because the update connects tax policy, the Consumer Price Index basket, food prices and monetary policy in one current-affairs issue. GST rate rationalisation, effective from September 22, 2025, affected 11.4% of the CPI basket. Lower GST rates on essential commodities and household goods directly reduced consumer prices and contributed to the fall in headline inflation.

Good monsoon harvests also supported the decline. Food and beverages are the largest component of the CPI basket, so softer food prices have a strong impact on the headline inflation number. At the same time, the RBI maintained the repo rate at 5.50% with a neutral policy stance. A neutral stance gives the central bank flexibility to cut rates if growth weakens or hold rates if inflation rebounds.

For static GK, this topic links with the CPI, repo rate, monetary policy and the GST framework. In prelims, the likely focus is on the figure, date and reasons behind the decline. In mains, the issue can be used to discuss inflation control, tax-policy changes and the role of food supply conditions. The September 2025 print was described as India's lowest inflation reading in over 8 years, so it should be studied not merely as a monthly data point but as an example of fiscal and monetary policy factors working together.