Automated Direct Debit Amendment and Cancellation Service (ADDACS)
A UK Bacs messaging service that automatically notifies organisations when a customer’s bank details change or a Direct Debit instruction is cancelled. ADDACS messages are sent by banks to service users (or their bureaux/software providers) to communicate amendments such as updated account numbers, branch transfers, or instruction cancellations. This enables organisations to promptly update their records, prevent failed collections, maintain data accuracy, and ensure ongoing compliance with Direct Debit scheme rules while reducing manual intervention and operational risk.
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