Government Hikes Diesel and ATF Export Tax: Impact on Reliance, OMCs and Airlines

The government has sharply increased export duties on diesel and aviation turbine fuel, or ATF, with effect from July 16, 2026.

The export duty on diesel has been raised from ₹8.50 per litre to ₹15.50 per litre, while the duty on ATF exports has increased from ₹7.50 per litre to ₹14.50 per litre. At the same time, the government reduced the export duty on petrol from ₹4 per litre to ₹2.50 per litre.

The announcement may appear negative for diesel users, airlines and logistics companies. However, the most important clarification is that this is not a tax increase on diesel or ATF sold within India.

The higher levy applies when refiners export these fuels outside India. Therefore, its direct impact will be felt by fuel exporters and refineries, rather than motorists or domestic airlines.

What Has the Government Changed?

The latest revision is part of the government’s fortnightly review of fuel export duties.

The diesel export duty has increased by approximately 82%, while the ATF export duty has nearly doubled.

These rates were revised through Ministry of Finance notifications dated July 15, 2026, and became effective from July 16.

How Will the Tax Affect Refining Margins?

The impact is relatively straightforward.

Suppose a refinery earns a strong margin by exporting diesel. The additional ₹7 per litre duty will now be deducted from the amount the refinery retains.

For every 10 crore litres of diesel or ATF exported, the additional ₹7 levy translates into approximately ₹70 crore of extra tax.

However, this does not automatically mean that refinery profits will fall sharply.

The final impact will depend on whether international diesel and ATF prices have increased enough to absorb the higher tax. If export margins rise by more than ₹7 per litre, refiners could continue earning more than normal even after paying the duty.

Therefore, investors should analyse the following equation: Increase in global refining margins minus higher export duty equals the actual benefit retained by the refinery.

This distinction is important because the government may be reducing a windfall gain rather than eliminating refinery profitability.

What Is the Impact on Reliance Industries?

Reliance Industries is usually the first company investors associate with fuel exports because it operates one of the world’s largest refining complexes in Jamnagar.

However, Reliance’s case has an important exemption.

The company operates two major refineries at Jamnagar. One refinery, with a capacity of around 33 million tonnes per year, largely serves the domestic market. Its second refinery, with an annual capacity of around 35.2 million tonnes, operates within a Special Economic Zone and is focused on exports.

A government official clarified in April 2026 that the diesel and ATF export duties would not apply to Reliance’s SEZ refinery because of earlier judicial rulings.

This significantly changes the investor interpretation.

A large portion of Reliance’s export-focused refining capacity may remain protected from the levy. Therefore, it would be incorrect to simply multiply Reliance’s fuel exports by the new tax rate and treat the result as a direct hit to earnings.

Reliance can still be affected through changes in global crude prices, product prices, freight costs and refining margins. But the direct impact of the latest export-duty hike could be limited compared with refiners whose exports do not receive the SEZ protection.

What Is the Impact on MRPL and Chennai Petroleum?

The tax change is more directly relevant for other refiners that produce and export diesel and ATF, including Mangalore Refinery and Petrochemicals, Chennai Petroleum and the refineries operated by state-owned oil marketing companies.

MRPL and Chennai Petroleum earn a significant part of their operating profit from refining crude oil into fuels. Their earnings can move sharply depending on gross refining margins, crude sourcing costs, plant utilisation and the mix of products sold domestically and overseas.

Higher export duties reduce the benefit these companies receive from strong global diesel and ATF prices.

Standalone refiners can be more exposed because they do not have a large nationwide fuel-marketing business to offset changes in export economics.

However, their profitability will still depend on the overall refining environment. Chennai Petroleum, for example, reported a significant improvement in FY26 profitability as its gross refining margin increased and refinery throughput reached record levels.

This shows why one tax revision should not be viewed in isolation. High refinery utilisation and strong product margins can still support earnings even when export duties increase.

What Does It Mean for IOC, BPCL and HPCL?

Indian Oil, BPCL and HPCL operate both refineries and large domestic fuel-marketing networks.

Their refining businesses could earn lower realisations on exported diesel and ATF because of the higher tax. But their overall position is more balanced than that of standalone refiners.

These companies sell large quantities of petrol and diesel within India. They can therefore benefit from stronger domestic fuel availability, improved refinery margins and better marketing economics.

A recent estimate indicated that elevated diesel crack spreads had lifted the integrated refining and marketing margin of oil marketing companies to around ₹27.7 per litre. These margins could help them recover losses incurred when crude prices rose sharply between March and June.

The export-duty increase will reduce part of this benefit. But as long as integrated margins remain significantly above normal levels, IOC, BPCL and HPCL may still generate healthy earnings.

Will Diesel Prices Rise for Consumers?

The latest announcement should not directly increase diesel prices at petrol pumps.

The government has previously clarified that changes in fuel export duties do not alter the excise duty charged on petrol and diesel sold for domestic consumption.

In fact, a higher export duty can make domestic sales relatively more attractive for refiners. This could increase the quantity of diesel available within India and reduce the risk of supply shortages.

However, retail diesel prices will continue to depend on global crude prices, the rupee-dollar exchange rate, marketing margins of oil companies, central and state taxes and government pricing decisions.

Therefore, consumers are protected from the direct impact of the export duty, but they are not completely protected from a sustained rise in global crude oil prices.

Will Airlines and Airfares Be Affected?

The ATF export-duty hike does not directly increase the fuel cost of domestic airlines such as IndiGo, Air India and SpiceJet.

The tax applies to ATF exported from India, not the ATF purchased by airlines for domestic operations.

The move may even support domestic ATF availability by making exports less attractive. This could provide some protection against shortages or unusually high domestic prices.

However, airlines remain highly sensitive to global crude oil and jet-fuel prices. If international ATF prices continue rising because of geopolitical tensions or supply disruptions, Indian airlines may still face higher operating costs.

Therefore, the export-duty hike itself is not negative for airlines. The larger risk for airline profitability remains the underlying rise in global fuel prices.

Why Frequent Tax Revisions Matter for Investors

The most important long-term takeaway is the return of policy risk for Indian refiners.

The government reduced diesel and ATF export duties to ₹8.50 and ₹7.50 per litre from July 1. Just fifteen days later, it increased both duties by ₹7 per litre.

This shows that export duties can change quickly depending on crude oil prices, fuel shortages and refining margins.

For investors, this makes refinery earnings more difficult to predict. A sharp rise in diesel crack spreads may not fully benefit shareholders because the government can increase export levies and capture part of the windfall.

Investors should therefore track global diesel and ATF crack spreads, the share of exports in each refinery’s product sales, SEZ exemptions, refinery utilisation and the frequency of government tax revisions.

Author’s Take

The diesel and ATF export-tax hike is negative for export realisations, but it does not necessarily mean refinery earnings will collapse.

Global diesel and jet-fuel margins remain elevated. The government is taking away part of these extraordinary gains, but refiners may still retain healthy profitability if product prices remain significantly above crude oil costs.

The direct impact may be higher for MRPL, Chennai Petroleum and state-owned refiners that pay the levy on their exports. Reliance Industries could be relatively protected because its export-focused SEZ refinery has been exempted from these duties under existing judicial rulings.

For IOC, BPCL and HPCL, the picture is mixed. Their export margins may decline, but strong refining margins, domestic sales and improving marketing economics can provide an offset.

The biggest takeaway is not higher diesel prices or higher airfares. It is that government intervention has again become a major variable in refinery earnings.

For refinery investors, strong global margins are positive, but only the portion left after export taxes ultimately reaches the company’s profits.