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Mastercard is asking Brazilian payment processors to split the bill on one of the country’s biggest fintech implosions. The card network has proposed that acquirers, the companies that process card payments for merchants, collectively absorb roughly R$2.5 billion (about $440 million) in losses tied to the collapse of Banco Master SA and its fintech arm, Will Bank.
The proposal comes after Mastercard already reimbursed approximately R$2.5 billion to acquirers for unsettled merchant payments. That figure represents about half of an estimated R$5 billion in total liability created when Banco Master’s failure left a gaping hole in the payment settlement chain.
How the dominoes fell
Banco Master was placed into extrajudicial liquidation on November 18, 2025, after fraud allegations surfaced that revealed R$17 billion in accounting discrepancies. Legal actions followed quickly, targeting prominent figures including the bank’s owner, Daniel Vorcaro. The liquidation exposed 1.6 million creditors holding R$41 billion in deposits.
Will Bank, a fintech that Banco Master had acquired in 2024, was liquidated in January 2026. Because Mastercard served as the card network provider for Will Bank, the company found itself directly entangled in the fallout. Every transaction that Will Bank processed through Mastercard’s rails but failed to settle became Mastercard’s problem to sort out.
The mechanics here matter. In a typical card transaction, the card network (Mastercard) sits between the issuing bank (Banco Master/Will Bank) and the acquirer (the payment processor working with the merchant). When the issuer collapses mid-settlement, someone has to cover the gap. Mastercard stepped in initially, but now it wants the acquirers to share the pain.
The dispute over who pays
Mastercard’s argument is straightforward: payment processors are participants in the settlement chain, and participants share risk. The company has already absorbed significant costs and seized collateral to offset its exposure. Now it is looking to distribute the remaining liability across the ecosystem.
The acquirers see things differently. Their position is that Mastercard, as the network operator, should bear the full financial burden connected to transactions processed during the period when Banco Master and Will Bank were deteriorating.
The Central Bank of Brazil is actively examining new rules related to card network obligations in light of this crisis.
Broader implications for Brazil’s fintech sector
The Banco Master saga has exposed vulnerabilities that were hiding in plain sight. Brazil’s high-yield banking sector attracted deposits by offering above-market returns. The R$17 billion in accounting discrepancies suggests the returns were, at least in part, a mirage built on fraudulent bookkeeping.
Disclosure: This article was edited by Editorial Team. For more information on how we create and review content, see our Editorial Policy.
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