- In Mexico, handling discounts under the CFDI system is a legal requirement. Discounts applied at the time of sale are included in the original CFDI of type Ingreso (I), while those granted after require a new CFDI of type Egreso (E). Discounts must be documented in the CFDI using the Descuento field, not as negative product lines, to comply with SAT rules. There are no restrictions on promotions, and a 100% discount is acceptable, provided the invoice reflects a total of 0.00 MXN. Retailers can offer item-level and total discounts, ensuring compliance with tax regulations.
Source: fiscal-requirements.com
Note that this post was (partially) written with the help of AI. It is always useful to review the original source material, and where needed to obtain (local) advice from a specialist.
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