Article 13 requires government and private entities to notify the Authority of their contracts and deals. Significant amendments by Law 11/2022 mandate that residents must, upon request during an audit, provide detailed statements of foreign financial assets—including bank accounts, shares, and real estate—if suspected of tax violations. This reporting requirement applies even if the assets do not currently impact tax obligations. This provision enhances the Authority's ability to monitor offshore wealth and combat tax evasion by ensuring residents disclose global financial interests when under investigation.