FDIC Insurance has nothing to do with ACH fraud - it covers cases where the bank itself fails. NACHA has its own process for ACH disputes/reversals/returns. No

FDIC Insurance has nothing to do with ACH fraud - it covers cases where the bank itself fails. NACHA has its own process for ACH disputes/reversals/returns. Not sure what GAAP and double entry accounting has to do with this. The fraud here is not from end users "crafting a malicious ACH payload". End users don't interact with NACHA in that way. The more common case is when users, via their bank, are doing ACH Pulls from accounts that they shouldn't be. Most banks that offer direct ACH Pulls to their customers use a third party like Plaid Identity or microdeposits to prove ownership of an external account prior to initiating the ACH Pull. This is not 100% effective always - disclosure: I work at a neobank and I am directly involved in building systems to prevent/mitigate ACH fraud.