The Brazilian National Treasury is set to deactivate the official Tesouro Direto mobile application on August 17, 2026, a move that will redirect millions of retail fixed-income investors to use the platforms of their custodial financial institutions, providing a structural customer-acquisition tailwind for large brokers and banks. The Treasury confirmed the date this week, stating that investors will now be required to access and manage their government bonds exclusively through the official Tesouro Direto Investor Portal or the dedicated app provided by their brokerage or bank, which acts as a custody agent. The change does not affect the validity or performance of existing bond investments, which are guaranteed by the sovereign government, but it fundamentally shifts the customer interface.