Brazil oil royalties trial returns to the Supreme Court on Wednesday, May 6, 2026, after a 13-year suspension, with the state of Rio de Janeiro and its municipalities facing potential annual losses of 20 to 30 billion reais (around 4 to 6 billion dollars). Justice Cármen Lúcia issued the original injunction in 2013 freezing Law 12.734/2012, which would shift oil royalties toward non-producing states.
The case is formally Direct Action of Unconstitutionality 4917, and the projected loss for Rio over the 2020 to 2025 window alone reaches 48.3 billion reais (around 9.56 billion dollars) at the state level and 68.7 billion reais (around 13.6 billion dollars) for fluminense municipalities, according to the local federation of mayors.
Key Points
— The Supreme Court resumes ADI 4917 on May 6, 2026, after a 13-year freeze ordered by Justice Cármen Lúcia in 2013.
— Law 12.734/2012 would lift the share of non-producing states from 7.5 percent to 49 percent of oil royalties.
— Rio de Janeiro projects state-level losses of around 9 billion reais a year if the law is upheld, equivalent to 9.3 percent of net current revenue.
— Rio de Janeiro produced about 80 percent of Brazilian oil in 2025 and concentrated 75 percent of national royalty revenue.
— A conciliation hearing scheduled for May 5 was cancelled to clear the docket for Wednesday’s plenary vote.
What the Court Will Decide
The Rio Times, the Latin American financial news outlet, reports that ADI 4917 was filed by Rio de Janeiro against the 2012 federal law that redrew the royalty pact written into the original pre-salt framework. The law would lift the share allocated to non-producing states and municipalities from 7.5 to 49 percent, distributed through the existing State and Municipal Participation Funds. Justice Cármen Lúcia froze the statute in March 2013, citing risks to public services in producing states.
The plenary session was originally scheduled for early May with a parallel mediation track. The Núcleo de Solução Consensual de Conflitos cancelled the conciliation hearing previously set for May 5, citing the proximity of the merits vote. Rio de Janeiro acting governor Ricardo Couto de Castro travelled to Brasília on April 30 to meet President Luiz Inácio Lula da Silva and Justice Luiz Fux on the trial’s financial impact.
The Numbers Behind the Dispute
Royalties account for 21.8 percent of Rio de Janeiro‘s total revenue, according to the state municipalities’ federation. Five fluminense cities alone collected 10.6 billion reais (around 2.1 billion dollars) in 2024, more than half of all royalties paid to Rio’s municipal level. Across the state and its cities, oil revenue concentrated about 44 billion reais in 2024, equivalent to 75 percent of the national total.
Why It Matters for Federal Investors and Bondholders
Rio de Janeiro is one of the largest issuers of subnational debt in Latin America, and royalty revenue underpins a meaningful share of its credit story. The local Assembly’s budget commission cites a possible annual hit of 20 to 30 billion reais, on top of an existing 26 billion reais shortfall already booked from earlier changes to the pre-salt sharing regime. Rio’s state legislature passed a manifesto in late April asking that the 2013 injunction be preserved.
For non-producing states such as Rio Grande do Norte, Minas Gerais and São Paulo, the upside is the inverse: roughly 91 percent of state-level royalties in 2025 went to Rio de Janeiro, São Paulo and Espírito Santo. Lifting the non-producer share to 49 percent would redirect tens of billions of reais a year through the federal participation funds.
| Indicator | Value |
|---|---|
| Case | ADI 4917 (Law 12.734/2012) |
| Suspension period | Since March 2013 |
| Non-producing share, current vs proposed | 7.5% to 49% |
| Estimated annual loss for Rio | BRL 20-30B (~USD 4-6B) |
| Royalties as share of Rio revenue | 21.8% |
| Rio share of national oil output, 2025 | ~80% |
| Top 5 fluminense cities, 2024 royalties | BRL 10.6B (~USD 2.1B) |
How the Ruling Reframes Brazil’s Federal Pact
The royalty regime sits at the heart of Brazil’s federal compact: producing states absorb the social and environmental costs of extraction, while the rest of the country argues for wider sharing of subsoil wealth that, under the constitution, belongs to the federal Union. Rio’s case rests on legitimate expectations and the disruption of services tied to legacy concessions. Non-producing states cite article 20 of the constitution, which assigns subsoil resources to the Union.
The trial restarts during a Brent oil price spike to 110 to 114 dollars per barrel, magnifying the absolute amounts at stake. Rio’s governor’s office has signalled it will push for transition rules even if the court rules against the state.
Connected Coverage
For broader context, see our coverage of Brazil’s Central Bank signal that rate cuts will slow on the Brent oil shock and our analysis of the Supreme Court order to reform Brazil’s securities watchdog within 20 days.
What Happens Next
- May 6, 2026: The Supreme Court plenary resumes the merits trial of ADI 4917 on the constitutionality of Law 12.734/2012.
- Transition framework: Rio’s governor’s office will press for phased implementation if the court overturns the 2013 injunction.
- Subnational debt: Rating agencies and bondholders will reassess Rio de Janeiro state debt against any redistribution scenario.
Frequently Asked Questions
What is the Brazil oil royalties trial about?
The Brazil oil royalties trial concerns Direct Action of Unconstitutionality 4917, filed against Law 12.734/2012, which would lift the share of non-producing states from 7.5 percent to 49 percent of national oil royalties. Justice Cármen Lúcia froze the statute in March 2013, suspending the merits vote for 13 years. The Supreme Court resumes the trial on May 6, 2026, with potential annual revenue swings of 20 to 30 billion reais for Rio de Janeiro alone.
How much could Rio de Janeiro lose if the law is upheld?
Rio de Janeiro projects state-level annual losses of around 9 billion reais if Law 12.734/2012 is upheld, equivalent to 9.3 percent of net current revenue. Combined with municipal losses, the local Assembly’s budget commission projects a total annual hit of 20 to 30 billion reais. The federation of mayors estimates that, applied retrospectively over 2020 to 2025, the law would have stripped 48.3 billion reais from the state and 68.7 billion reais from fluminense municipalities.
Which states benefit most from the existing royalty rules?
Rio de Janeiro, São Paulo and Espírito Santo together collected more than 90 percent of state-level oil royalties in 2025, according to Brazil’s National Petroleum Agency. Rio de Janeiro alone produced about 80 percent of national output and its state and cities concentrated 75 percent of national royalty distribution. Just five fluminense municipalities, including Macaé and Campos, collected 10.6 billion reais of municipal royalties in 2024.
Why is the trial restarting now?
The Supreme Court restarts the trial on May 6, 2026 because the 2013 injunction was procedural, not a final ruling, and pressure built from non-producing states whose municipal coffers are squeezed. Brent crude near 114 dollars per barrel magnifies the absolute amounts at stake. Acting Rio governor Ricardo Couto de Castro met President Lula and Justice Luiz Fux on April 30 to argue for stability.
Updated: 2026-05-06T08:30:00Z by Rio Times Editorial Desk