A group that pushes big companies to act on climate change has told BHP's investors something fairly striking: a government tax break worth hundreds of millions of dollars to the mining giant may be the very thing discouraging it from cutting emissions.

The group is called the Australian Centre for Corporate Responsibility, or ACCR. It works by buying small shareholdings in companies and using that position to pressure them from the inside. On July 16, 2026, it sent a briefing to BHP investors that leaned on leaked BHP documents obtained earlier this year by Guardian Australia and ABC's Four Corners. Those documents showed BHP had shelved or delayed key projects to cut emissions, including large-scale renewable energy in Western Australia, electrifying its diesel truck fleet in the Pilbara, and a processing plant meant to lower emissions for its steel-making customers. The ACCR said those delays raised serious questions about how open BHP is being about its climate plans, and urged investors to push the company to set a medium-term emissions target, arguing that without one 'there is no clear imperative to decarbonise in the medium-term'.

The tax break in question is called the fuel tax credit. When you buy petrol or diesel at the bowser, a chunk of what you pay is fuel excise, a tax that supposedly funds roads. Mining companies use enormous amounts of diesel in remote operations, off public roads, so the government refunds most of that excise back to them. Last financial year, that refund was worth $622 million to BHP alone, making it the single biggest recipient of the scheme. The current fuel tax rate is 52.6 cents per litre, with ATO rates for July 1, 2025 to June 30, 2026 reflecting a 60.9% reduction to fuel excise duty and a road user charge set to zero.

ACCR's Naomi Hogan put it plainly: remove the fuel tax credit and 'most of BHP's fleet electrification projects become financially viable'. In other words, with the rebate gone, switching from diesel to electric starts paying for itself. The ACCR found that scrapping the credit would flip four major decarbonisation projects, including electrifying truck and rail fleets in inland WA, from neutral returns to positive ones.

BHP's own sustainability materials acknowledge 'delays to adoption of electrified fleet at scale' on its greenhouse gas emissions page. The company's 2025 Annual Report mentions a 2030 operational decarbonisation target. Its half-year results for the period ended 31 December 2025 reported a global adjusted effective tax rate of 36.6%, rising to 43.0% once revenue and production-based taxes are included. BHP paid less than $9 million under the safeguard mechanism, the federal policy that requires large companies to keep emissions under set limits, as reported in Guardian Australia's May 2026 coverage. The company's Climate Transition Action Plan 2024 discusses potential decarbonisation pathways for individual steelmakers in its value chain.

The political pressure has been building. More than 270 local ALP branches have passed motions supporting a campaign by the Labor Environment Action Network, or LEAN, to cap fuel tax credits at $50 million per company. Labor MP Jerome Laxale broke ranks in May 2026 to publicly back limiting fossil fuel tax concessions, following the Guardian's investigation. Independent senator David Pocock has also backed calls to reform the fuel tax credit.

Investors are starting to pay attention. The Investor Group on Climate Change has scheduled an August 2026 briefing called 'Turning the Diesel Fuel Tax Credit into a Decarbonisation Tailwind? In Depth Briefing', which signals that big investors are treating the rebate as a climate risk, not just a settled policy.

This is happening while the federal government pushes its own critical minerals strategy. In February 2025, the Senate passed Production Tax Credits legislation that creates a Production Tax Incentive worth 10% of relevant processing and refining costs for Australia's 31 critical minerals. So the government is effectively subsidising diesel use in mining through the fuel tax credit while also offering tax incentives for processing critical minerals. Whether those two policies are pulling in opposite directions on climate is exactly the question ACCR is putting to BHP's investors.

The ACCR's approach is worth noting. Instead of lobbying the government, it has gone straight to investors, framing the fuel tax credit as a financial distortion that makes clean projects look less profitable than they actually are. That turns the rebate into a shareholder value problem, not just an environmental one. Whether big investors take up that argument at BHP's next annual general meeting will tell us whether the fuel tax credit is still untouchable, or whether it has become a genuine policy debate.