A nota di credito is a credit note: a formal accounting document used to reduce, correct, or reverse a previously issued invoice. In Italian e-invoicing, it is often used when a charge was overstated, a service was partially canceled, or a transaction must be adjusted without deleting the original record.
In cyber security and digital finance controls, credit notes matter because they are part of the audit trail. Attackers and careless insiders may try to abuse correction documents to hide fraud, change totals, or confuse reconciliation systems. Defenders rely on strict validation, document linking, and immutable logs to show which invoice was issued, which was corrected, and why. In structured workflows such as FatturaPA, a credit note is not just paperwork: it is a trusted data object that helps preserve integrity, traceability, and compliance.