The Indian government has revised the windfall tax on petroleum exports, increasing levies on petrol and diesel while slightly reducing the tax on aviation fuel. Effective September 2026, the move follows a surge in global crude oil prices, which recently crossed $91 per barrel. For investors, this adjustment signals potential margin pressure on oil refiners, as the government continues to recalibrate export duties based on fortnightly global market trends.
The central government has updated the Special Additional Excise Duty, commonly known as the windfall tax, on petroleum product exports. Under the latest revision, the government has increased the export levy on petrol to ₹1.5 per litre, shifting from the previous nil rate. Simultaneously, the tax on diesel exports has been raised to ₹25 per litre from the earlier ₹24 per litre. In a slight relief for the aviation sector, the export duty on Aviation Turbine Fuel has been lowered to ₹19 per litre, down from ₹19.5 per litre.
This fortnightly review mechanism is primarily driven by volatility in the international energy markets. Global crude oil prices have remained elevated, recently breaching the $91 per barrel mark, largely influenced by ongoing geopolitical tensions, particularly in West Asia. The government uses these periodic tax adjustments to balance state revenue requirements against the high profit margins that domestic refiners generate when global crude prices spike.
For investors, the primary concern revolves around the netback margins of oil refining companies. When the government increases the windfall tax on exports, it effectively caps the potential gains refiners can achieve from selling petroleum products in international markets during periods of high global prices. While these changes are significant for export-oriented operations, they do not impact the pricing structures for fuel sold within the domestic Indian market, meaning retail pump prices remain insulated from these specific export levies.
Refiners with significant export exposure face a direct impact on their profitability. If global crude prices remain volatile or trend higher, the government may continue to utilize these levies to manage the domestic supply and export equilibrium. Investors in the energy sector should monitor future fortnightly notifications, as any further increases in crude oil prices could lead to more frequent adjustments in these duties.
The broader risk factor remains the geopolitical uncertainty in oil-producing regions. Any supply disruption or further escalation in international conflicts could keep crude prices high, potentially leading to sustained tax pressure on export-oriented energy firms. Investors may also track management commentary from major refiners regarding their ability to maintain operational efficiency and margin targets amidst these evolving export duty structures.