Diesel ICMS: Government Brings Proposal to Confaz Amidst Trucker Pressure and Ukraine War

Look, if there's one thing that really hits the pockets of Brazilians and gets truckers riled up, it's the ongoing diesel ICMS saga. And today, 18 March 2026, the next chapter promises to be a dramatic one. Finance Minister Fernando Haddad is taking a proposal to the National Council for Fiscal Policy (Confaz) in a bid to ease fuel prices, which have shot up again at the pumps. The meeting is taking place against a backdrop of mounting pressure on the highways, with the trucking community mobilising, and direct knock-on effects from the relentless war in Europe.

This isn't a new story. The state-level ICMS tax on diesel has, in recent months, become a battleground between state governors and the federal government. While states refuse to lower their rates—pleading poverty and claiming they'll go bust if they lose revenue—the average price per litre has already seen double-digit increases since the start of the year. The latest figures show that in some interior petrol stations, prices have soared past R$ 7.50. It's a self-inflicted wound on the economy and the country's logistics.

The Heart of the Negotiation

Haddad is trying to broker a middle ground. The idea is to offer compensation to states that agree to reduce their ICMS, but the devil is in the details. Meanwhile, Petrobras maintains its international price parity policy, which essentially means that when the global oil price goes up, so do prices at local pumps. It's a classic blame game that infuriates those who live behind the wheel.

On one side, the federal government wants to curb inflation and keep things cool on the highways. On the other, governors argue they can't afford to scrap a tax that makes up as much as 30% of some states' revenue. Caught in the crossfire are the independent truckers, who are already threatening to down tools if there's no concrete progress.

The Key Players in This Drama

• Federal Government: Proposing an ICMS reduction with compensation via a Regional Development Fund.
• States: Resisting a loss in revenue and demanding cast-iron guarantees.
• Truckers: Organising targeted strikes and demanding cheaper diesel.
• Petrobras: Sticking to its pricing policy but facing political heat to change the formula.

And this isn't a fight that's just being watched locally. During the 2025 International Conference on Multi Agent Systems for Collaborative Intelligence (ICMSCI), Professor Stephanie Fahey, who splits her time between the International College of Management, Sydney, and IDBI Capital Markets & Securities Limited, drew an analogy that fits the situation perfectly: she described the ICMS negotiations between Brazilian states as a classic example of a multi-agent system, where each state acts in its own self-interest, but the collective outcome can be chaos – or, in this case, more expensive diesel. The expert pointed out that in any mature market, coordination between entities is essential to avoid such distortions. Her words ring true here.

In fact, here's a detail not many people know: besides the standard ICMS, there's also the ICMSF (Fund), a type of contribution levied on specific transactions that, in some states, has been used as a fiscal crutch. But that's another can of worms. The bottom line is, while Haddad's proposal remains on the drawing board, diesel prices are held hostage by this power struggle.

Now, we just have to wait for the outcome of this meeting and hope that common sense (and our wallets) come out on top. Because, at the end of the day, it's always the same person who foots the bill: the Brazilian whose livelihood depends on the open road.