As a general rule, a bank cannot monitor your accounts at other financial institutions on a daily basis, as there is no shared national database for this purpose. However, your banking activity is not completely isolated. If you authorize data aggregation services—such as apps that provide a "net worth" view of your finances—the bank might receive information you have explicitly consented to share. Moreover, banks gain visibility into your other financial relationships through credit reports, which show your debt obligations, or through documentation you provide, such as statements for a mortgage application or loan approval. In instances of serious legal investigation or tax compliance, a bank or other authority can formally request information about your external financial holdings, making the entirety of your financial profile accessible to regulators and court officers.