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Credit notes represent CFDI relationships where one invoice applies credit to another invoice. Use them to understand how issued credit-note invoices affect the amounts of related invoices. A credit note links the invoice that issued the credit to the invoice where the credit was applied. You can list credit notes across invoices, retrieve a single credit note by ID, or list the credit notes issued by or applied to a specific invoice. Credit notes are extracted from invoice data when SAT returns egress CFDIs and their related invoice information. To retrieve them, run an invoice extraction for the entity and include type E invoices in the extraction options.