Greetings,

Mexico taxes and regulations differ depending on the importer of record (IOR) for the products sold to Mexican customers:

• Self-fulfilled products: If you ship your products to customers from outside Mexico, you will be listed as the IOR. This means you must pay destination duties, taxes, and customs-clearance fees before your product can be sold to customers on Amazon.com.mx.
• Fulfillment by Amazon (FBA): If you import inventory to be stored in an Amazon fulfillment center in Mexico, you are the IOR and must pay destination duties, taxes, and customs-clearance fees before your product can be stored in a Mexico fulfillment center when your products are sold to customers on Amazon.com.mx. Note that Amazon and its fulfillment centers will not serve as the IOR for any FBA shipment. Listing Amazon as the IOR on FBA shipments to Mexico or failing to specify an IOR may result in loss of selling privileges. In addition, noncompliant shipments may be refused and returned at the shipper’s expense.
• Remote Fulfillment with FBA: If you sell products in Mexico through Remote Fulfillment with FBA, the customer becomes the IOR. Amazon will collect from the customer and pay the destination duties, taxes, and customs-clearance fees on their behalf.

I don't have explicit answers related to tax regulations, but for additional support I recommend reviewing this Seller Central Help page or contacting Seller Support.

- Bryce