India raises the windfall tax on petrol exports to INR 3.5/litre (prev. INR 2.5/litre) and diesel export to INR 24/litre (prev. INR 15.5/litre), effective Aug 3rd

India's windfall levy on fuel exports is revised on a rolling fortnightly schedule, moving with crude and product crack spreads, so a step-up of this kind is routine maintenance of the framework rather than a policy shift. The mechanism is straightforward: a higher export tax compresses netbacks for the large private refiners that run export-oriented capacity, which at the margin discourages product outflows and keeps more diesel and gasoline in the domestic system. In past iterations of this regime, the read-through for regional product markets has been modest unless the levy is set high enough to actually shut the export arb, at which point Atlantic Basin diesel supply loses a marginal barrel and cracks in that complex have tended to tighten. The diesel increase is materially larger than the petrol one in absolute terms, which fits the pattern of authorities targeting the fuel where export margins have been strongest. The tells are the next scheduled revision, any move in the domestic crude levy that usually travels with these, and refiner commentary on export economics. As a recurring, formula-driven adjustment, the signal is incremental rather than structural.