BCB Resolution 521 and Stablecoins: What US Companies Operating in Brazil Need to Know

In November 2025, Brazil's Central Bank published a resolution that fundamentally changed how stablecoins work within the country's financial system. BCB Resolution 521, in force since February 2026, did not ban stablecoins. It did something more consequential for international businesses: it classified operations with foreign currency-referenced stablecoins as foreign exchange transactions.

For a US company using USDC to pay Brazilian suppliers, receive payments from Brazilian clients, or hold treasury reserves denominated in dollar-pegged stablecoins, this classification has direct compliance, tax, and operational implications that did not exist before February 2026.

This article explains what changed, what it means for US companies with Brazilian operations, and how to structure stablecoin use within the new regulatory framework.

1. What BCB Resolution 521 Actually Says

The resolution's core provision comes from Article 76-A of Brazil's Foreign Exchange Law (Lei 14.286/2021), which Resolution 521 regulates: operations with virtual assets referenced in foreign currency are classified as foreign exchange operations when used for international payments and remittances.

In plain terms: if your company uses USDC or USDT to move money between Brazil and the United States — whether paying vendors, receiving revenue, or settling intercompany transactions — that operation is now treated as a foreign exchange transaction under Brazilian law.

This triggers three sets of obligations that did not apply to stablecoin operations before February 2026:

• 1. Identification and documentation requirements: Both parties in a stablecoin-denominated cross-border transaction must be identified. The documentation requirements mirror those applied to traditional FX operations — contract of exchange, identification of the economic purpose, and record-keeping for BCB audit purposes.
• 2. Authorized counterpart requirement for large transactions: For transactions above US$ 100,000 in stablecoins classified as FX, the Brazilian side of the operation must involve a BCB-authorized institution. This means US companies cannot transact directly with Brazilian counterparts above this threshold without routing through a licensed Brazilian bank or VASP.
• 3. IOF-Câmbio tax: The FX classification brings the 3.5% IOF-Câmbio tax to stablecoin operations. The exact moment of the taxable event — whether at each transfer, at acquisition of the stablecoin, or at conversion to BRL — is still being clarified by Brazil's tax authority (Receita Federal), but the 3.5% rate applies to the classified FX operations.

2. What BCB Resolution 561 Added in April 2026

One month after Resolution 521 took full effect, the BCB published Resolution 561, which addressed a specific use case: stablecoins as backend settlement infrastructure for regulated cross-border payment services (eFX).

Before Resolution 561, Brazilian fintechs including some with US parent companies had been using USDT or USDC as the settlement rail between their Brazilian operation and their US counterpart. The Brazilian user would deposit BRL, the fintech would convert to stablecoin, move it to the US side, and deliver USD — all without the operation appearing as a formal FX transaction.

Resolution 561 closed this structure explicitly. The payment or settlement between a Brazilian eFX provider and its foreign counterpart must now occur exclusively through a formal FX operation or through a non-resident BRL account held in Brazil. Stablecoins cannot be the settlement layer in this model.

"The BCB is drawing a clear line: you can hold stablecoins as asset wrappers, but you cannot use them to bypass the official foreign exchange framework under the guise of payment settlement infrastructure."

What Resolution 561 prohibits:

• eFX providers using any stablecoin or crypto asset to settle cross-border payments with foreign counterparts
• Converting BRL to stablecoin for external settlement within the eFX framework

What Resolution 561 does not prohibit:

• Buying, selling, holding, or transferring stablecoins outside the eFX framework
• US companies receiving stablecoins directly from Brazilian counterparts (peer-to-peer, outside regulated eFX)
• Brazilian VASPs operating under BCB Resolution 521's framework
• Treasury management in stablecoins where no classified FX operation occurs

The distinction is technical but legally significant. The resolution is a targeted restriction on a specific settlement structure, not a broad prohibition on stablecoin use.

3. The IOF Question: What Is Still Being Resolved

The IOF implications of Resolution 521 are the most commercially significant open question for US companies in 2026.

What is clear: Operations with stablecoins that fall within the FX classification of Resolution 521 — used for cross-border payments and remittances — are subject to IOF-Câmbio at 3.5%. This applies from February 2026 onward.

What is not yet clear: The Brazilian Ministry of Finance opened a public consultation in early 2026 proposing to extend the 3.5% IOF to all stablecoin purchases, including purchases on exchanges by individuals with no immediate FX purpose. The proposal generated significant pushback from the industry and was suspended pending further analysis.

A separate technical position from the BCB — submitted to Brazil's Congress as part of a broader stablecoin legislative proposal — argued that dollar-pegged stablecoins should be classified as private foreign currency rather than virtual assets. If adopted, this classification would subject stablecoin purchases to 1.1% IOF (the rate applied to foreign currency cash purchases) rather than 3.5%.

The practical implication for US companies: the cost of entering and exiting stablecoin positions in Brazil will change as this debate resolves. Operations should be modeled with sensitivity analysis across both IOF scenarios.

4. How This Affects US Companies: Four Scenarios

5. The SPSAV: The New License Category You Need to Know

Resolution 521 created a new legal entity category: the Sociedade Prestadora de Serviços de Ativos Virtuais (SPSAV) — the Brazilian equivalent of a licensed VASP with FX exposure.

Companies that intermediate stablecoin operations classified as FX on a habitual basis need SPSAV authorization from the BCB. The requirements include:

• Minimum capital adequacy (to be fully adjusted by BCB implementing regulations)
• Corporate governance standards equivalent to those applied to traditional FX brokers
• AML/KYC infrastructure meeting BCB and COAF standards
• Monthly reporting on stablecoin transaction volumes
• Authorization deadline: May 2027 for companies already operating

For US companies with Brazilian subsidiaries handling stablecoin transactions habitually, legal analysis is required to determine whether their volume and function trigger mandatory SPSAV registration.

6. Structuring Stablecoin Operations for Compliance: A Practical Framework

For US companies operating in Brazil with stablecoin exposure, we recommend this four-step compliance protocol: