Brazil’s Exchange B3 Sheds a US$440 Million Tax Bill
Brazil · MARKETS
Key Facts
- —Case outcome Carf’s highest panel cancelled two federal tax assessments against B3 for good.
- —Amount The two assessments were worth 2.28 billion reais (US$440 million) at 30 June 2026.
- —Subject Capital gains tax on B3’s sale of its CME Group stake, in 2015 and 2016.
- —Company statement B3 told the market on 1 September 2026 that its accounts are unchanged.
- —Still open Other tax claims worth about 10.5 billion reais (US$2.0 billion) sit unprovisioned on B3’s books.
A 440 million dollar win that changes nothing. And a far bigger pile of tax claims that is still there.
B3 runs Brazil’s stock exchange. It has just won a decade-old fight with the tax authority worth 2.28 billion reais (US$440 million).
The dispute was over how B3 taxed the sale of its stake in CME Group. B3 told the market on 1 September 2026, and its accounts do not move at all.
What Carf Cancelled
Carf is the federal tax appeals council. It sits between the tax authority and the courts, and its upper chamber is the last stop.
The first panel of that chamber struck down two assessments for corporate income tax and social contribution. They covered the 2015 and 2016 tax years.
The 2015 case was worth 504.8 million reais (US$98 million) at 30 June 2026. The 2016 case was worth 1.77 billion reais (US$344 million).
One small piece survived. About 5.7 million reais (US$1.1 million) of the 2016 case was not admitted, and B3 will fight it in court.
What the Argument Was About
B3’s predecessor BM&FBovespa owned a stake in CME Group, the Chicago derivatives exchange. It sold a fifth of that stake in 2015 and the rest in 2016.
The shares were priced in dollars. Their value in reais therefore moved with the exchange rate over the years B3 held them.
B3 counted that currency movement as part of what the shares had cost it. That reduced the gain it had to pay tax on.
The tax authority said the currency movement could not be treated that way. It assessed the difference, and Carf has now sided with B3.
B3 No Longer Owns Any of CME
This is a dispute about a stake B3 sold ten years ago. It left CME Group completely in 2016 and holds nothing in it today.
Outside its own subsidiaries B3 owns a fifth of the network operator RTM. It also holds half of a joint venture, N5 Energia.
It sold its stake in the technology firm Dimensa in the first half of 2026. That brought in 685.8 million reais (US$133 million).
Why the Win Does Not Show Up in the Accounts
A provision is money a company sets aside when it expects to lose a case. B3 rated its risk here as possible rather than probable.
Under accounting rules that means disclosing the case but setting nothing aside. So nothing is released now, and reported profit does not change.
The Much Larger Pile That Is Still Open
B3 carried about 10.5 billion reais (US$2.0 billion) of tax claims it treats as possible losses. That is up from 9.9 billion reais at the end of 2025.
None of it is provisioned. The biggest cluster concerns goodwill from the 2008 merger that created BM&FBovespa.
B3 won the largest of those in March 2025, worth 5.77 billion reais. Three others totalling about 5.24 billion reais (US$1.0 billion) are still live.
Two of those three have already gone against B3 at Carf. It is now fighting them in court, a weaker spot than it held on the CME cases.
A fresh assessment landed in October 2025 covering the 2021 and 2022 tax years. That one is worth 1.13 billion reais (US$219 million).
Whether the Government Can Still Appeal
In practice, no. Carf’s upper chamber is the final administrative instance, and a ruling it can no longer reform extinguishes the tax claim.
Brazil’s highest court for non-constitutional matters ruled on this in 2024. Carf decisions cannot be annulled by a judge who simply reads the law differently.
The ruling settles these assessments, not the underlying legal theory. The tax authority has re-assessed B3 on the goodwill question year after year.
Frequently Asked Questions
What did Carf decide in the B3 case?
It cancelled two tax assessments against B3 covering the 2015 and 2016 tax years. The dispute was about how B3 worked out its taxable gain on selling CME Group shares.
How much was at stake?
About 2.28 billion reais (US$440 million) at 30 June 2026. A small residual of 5.7 million reais (US$1.1 million) survived and moves to the courts.
Does this change B3’s accounts?
No. B3 rated its chance of losing as only possible, so it had set no money aside.
Is B3 now free of tax disputes?
No. It still carries about 10.5 billion reais (US$2.0 billion) of unprovisioned tax claims, mostly over goodwill from a 2008 merger.
Can the tax authority appeal?
Not inside the administrative system, because Carf’s upper chamber is the last stop. The courts have said they will not overturn such rulings simply to read the law differently.
Connected Coverage
Sources: B3 comunicado ao mercado of 1 September 2026; B3 second-quarter 2026 financial statements filed with the CVM on 11 August 2026, notes 6a and 11f; Estadão; Valor; InfoMoney. Converted at 5.1564 reais to the dollar, the Banco Central PTAX rate for 1 September 2026.
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