@mlittleton-farme , having gone through the above discussion and generally agreeing with my colleagues @Critter-3 and @DoninGA , the situation in Mexico ( as I understand it ) is
(a) all residents or persons with permanent abodes in Mexico, must have a tax id called RFC --- these are issued by the local SAT office, free of charge.
(b) all transactions incur IVA ( like VAT in Europe )
(c) the payor ( the buyer ) in case of foreign persons selling assets , must withhold sales / transaction taxes and IVA and deposit in the sellers RFC account.
(d) RFC cannot be acquired in the USA -- only local SAT can issue it
(e) since all real asset sales are co-ordinated by a "NOTARIO ", --usually in locality / nearest larger town -- perhaps you should contact that Notario for advice on how to get around this . This is because as I understand the tax department really one cares that the taxes are collected and if you are foreigner you are not going to file return there in MX anyways.
(f) I am assuming here that the property you are selling is not held under a fideocommiso by the bank ( i.e. you are a Mexican national )
Please can you update us on this once you speak to the local NOTARIO -- this is knowledge extension
pk
