Unpriced Externalities Form 80 Percent of Fossil Fuel Subsidies: Why IMF Estimates Dwarf OECD Data

When a government subsidizes crop insurance, the fiscal cost is recorded exactly as it leaves the treasury. Fossil fuel subsidies operate on a similar ledger for the Organization for Economic Cooperation and Development, which tallies direct budgetary transfers. The International Monetary Fund measures the ledger differently, adding the unbilled costs of air pollution and climate change.[2][4]

This methodological split produces a massive divergence in how the world measures its financial support for coal, oil, and natural gas. In 2022, the OECD calculated global fossil fuel support at approximately $1.5 trillion. For that same year, the IMF reported a figure exceeding $7.04 trillion, equivalent to 7.1 percent of global gross domestic product.[1][2][4]

The $5.5 trillion gap between the two institutions does not stem from missing spreadsheets or hidden government accounts. It arises from fundamentally different definitions of what constitutes a subsidy. The OECD measures the money governments actively spend or forfeit, while the IMF measures the societal costs that fossil fuel producers are never forced to pay.[3][4]

Understanding this divergence is critical for policymakers attempting to phase out fossil fuel support. Phasing out a direct tax break requires a legislative repeal, whereas eliminating an unpriced externality requires implementing a new carbon tax. The two figures describe entirely different policy challenges.[3][5]

Tracking the Direct Fiscal Outlays

The OECD approaches fossil fuel subsidies as an accounting exercise, relying on a bottom-up inventory of specific government policies. The organization tracks direct budgetary transfers and tax expenditures that provide a benefit for fossil fuel production or consumption. This includes everything from direct grants to accelerated depreciation for drilling equipment.[2]

"The OECD uses a bottom-up method to estimate the fiscal cost of government support to fossil fuels by identifying and quantifying individual policy measures," the organization notes in its methodology documentation. The 2025 edition of the inventory includes 1,732 specific support measures across 52 economies.[2]

By this strict fiscal definition, global subsidies spiked dramatically during the 2022 energy crisis. As governments scrambled to shield consumers from surging energy prices following the invasion of Ukraine, the OECD found that total global subsidies nearly doubled. Price caps, consumer rebates, and reduced fuel taxes drove the total to $1.5 trillion.[2][4]

However, the OECD inventory intentionally excludes the environmental damages caused by burning those fuels. If a government does not actively transfer funds or reduce a benchmark tax rate for a fossil fuel company, the policy does not appear in the database. The inventory measures government action, not market failure.[2]

This strict boundary ensures that the OECD data remains grounded in verifiable fiscal documents. It allows finance ministries to see exactly which line items in their national budgets are propping up fossil fuel consumption. Yet, environmental economists argue that this approach captures only a fraction of the true financial advantage enjoyed by the industry.[3][5]

Pricing the Unbilled Environmental Damages

The IMF takes a broader economic view, defining a subsidy as any instance where the retail price of a fuel falls short of its true cost to society. This price-gap approach divides subsidies into two categories: explicit and implicit. Explicit subsidies occur when retail prices are kept below the actual supply costs.[1][3]

According to the IMF's 2023 update, the balance between direct fiscal support and environmental damage is heavily skewed. "Explicit subsidies have more than doubled since 2020 but are still only 18 percent of the total subsidy, while nearly 60 percent is due to undercharging for global warming and local air pollution," the fund reported.[1]

In the IMF's 2022 calculation, these implicit subsidies accounted for roughly 82 percent of the $7.04 trillion total. The institution estimates that local air pollution and climate change damages alone make up 60 percent of the global subsidy figure. The remainder includes broader societal costs, such as traffic congestion and foregone consumption taxes.[1][3]

By treating unpriced externalities as a subsidy, the IMF highlights the massive financial burden shifted from fossil fuel consumers to the general public. When a coal plant emits particulate matter that causes respiratory illness, the resulting healthcare costs are borne by citizens. This effectively subsidizes the cost of coal power.[3][4]

The IMF estimates that full fossil fuel price reform would prevent 1.6 million local air pollution deaths per year. It would also reduce global carbon dioxide emissions to an estimated 43 percent below baseline levels by 2030. This alignment with international climate targets would simultaneously raise revenues worth 3.6 percent of global GDP.[1]

Aligning Metrics with Climate Policy

The distinction between the OECD and IMF methodologies dictates how governments must respond to international commitments. When the Group of Twenty pledged to rationalize and phase out inefficient fossil fuel subsidies, finance ministers primarily focused on explicit fiscal measures. Those direct outlays are the exact metrics tracked by the OECD.[5]

Reforming explicit subsidies involves dismantling price controls, ending tax exemptions for exploration, and restructuring state-owned energy enterprises. These are politically sensitive moves, as they often result in immediate price spikes for consumers. In 2022, explicit subsidies amounted to roughly $1.3 trillion, heavily concentrated in emerging markets managing inflation.[1][3]

Addressing the IMF's $5.5 trillion implicit subsidy requires a completely different policy toolkit. Governments cannot simply cut a budget line to eliminate an unpriced externality. Instead, they must implement corrective pricing mechanisms, such as carbon taxes or cap-and-trade systems, to force the market to internalize the environmental damages.[3][5]

Economists refer to these corrective measures as Pigouvian taxes, designed to equal the marginal external cost of the polluting activity. If every nation implemented a carbon price that fully accounted for climate and health damages, the IMF's implicit subsidy figure would drop to zero. The physical emissions would then face true market pricing.[1][5]

Currently, very few jurisdictions price carbon at a level that covers these externalities. As a result, coal remains the most heavily subsidized fuel in the IMF database. Because coal generates severe local air pollution, the unpriced damages resulted in 80 percent of global coal consumption being priced at below half of its efficient level in 2022.[1]

Synthesizing the Global Subsidy Ledger

Recognizing that both methodologies provide valuable insights, international researchers have attempted to synthesize the data. The Fossil Fuel Subsidy Tracker combines the OECD's bottom-up inventory with the explicit consumer price-gap estimates from the IMF and the International Energy Agency. This creates a unified view of direct financial support.

To avoid double-counting, the tracker uses a strict rule-of-thumb approach when merging the datasets. "The IEA quantifies the underpricing of fossil fuels. Individual support measures in the OECD Inventory that lower the domestic price of a fuel can therefore already be captured by the IEA's price gap approach," the tracker's methodology notes.

However, this combined tracker intentionally excludes the IMF's implicit externalities, as external costs are not commonly reflected in tax expenditure data. This keeps the synthesized figure grounded in actual financial flows. It provides a clear baseline for fiscal reform while leaving broader environmental costs to carbon pricing initiatives.[5]

The debate over which metric to use ultimately depends on the question being asked. If a finance minister wants to know how much money the treasury is losing to fossil fuel tax breaks, the OECD inventory provides the answer. If a climate policymaker wants to measure total market distortion, the IMF figure is required.[4][5]

As governments face mounting pressure to meet the emission reduction targets outlined in the Paris Agreement, both metrics will remain central to the policy debate. The OECD data highlights the immediate fiscal reforms needed. Meanwhile, the IMF data underscores the massive, unpriced damages that continue to tilt the global economy toward fossil fuels.[3][5]

The Political Economy of Subsidy Removal

Beyond the sheer scale of the numbers, the distribution of these subsidies complicates reform efforts. Explicit subsidies are frequently defended as necessary protections for low-income households against volatile energy markets. However, economic analyses consistently show that broad fuel subsidies are a highly inefficient mechanism for poverty alleviation.[1][5]

According to the IMF, subsidizing fuels is a poorly targeted way to support vulnerable populations. For every dollar spent on explicit fossil fuel subsidies, the poorest 20 percent of households receive just 8 cents. The vast majority of the financial benefit accrues to wealthier households consuming significantly more energy.[1]

Removing these explicit subsidies could generate substantial fiscal space for governments. The IMF projects that eliminating explicit subsidies alone would raise government revenues by 0.6 percent of global GDP. These funds could be redirected toward targeted cash transfers, providing more effective support for low-income citizens without distorting energy markets.[1]

Yet, the political cost of reform remains daunting. Large subsidies entrench beneficiaries, harden below-cost price expectations, and trigger fierce public backlash when removed. When governments attempt to dismantle consumer price controls, the immediate spike in fuel costs often leads to widespread protests, forcing policymakers to reinstate the fiscal support.[5]

Ultimately, the transition away from fossil fuels requires addressing both sides of the subsidy ledger. Governments must phase out the $1.5 trillion in direct fiscal support tracked by the OECD to level the playing field. Simultaneously, they must implement carbon pricing to internalize the $5.5 trillion in environmental damages identified by the IMF.[1][2][5]