Regulation E implements the Electronic Fund Transfer Act and governs consumer electronic payments, including debit card transactions, ACH, P2P transfers and prepaid accounts. In practice its compliance weight sits in error resolution and unauthorised transfer liability, which is why Reg E appears in fraud, disputes and chargeback role specifications rather than in AML ones. Amended repeatedly, most recently around prepaid accounts and remittances, so confirm the current text before relying on any summary.