Abstract: Fund transfer transactions within an economy are monitored at a selected level, such as at entry into the banking system and exit from the banking system. Every transaction is processed at its exit and its entry points to the banking system by deducting from the transaction value an equal percentage at both exit and entry points. The bank collects data about substantially all transactions to show at least the tax nexus of a transacting party. Certain collected data can trigger special processing methods that cause deduction of tax at an alternate rate or direct some of the tax to a specially designated recipient. The bank transfers the collected tax to the bank's tax jurisdiction or to one or more tax jurisdictions that the collected data shows to have a tax nexus to one or more transacting parties.