In Spain three regional tax authorities (Gipuzkoa, Biscay, and Álava) and the Basque government have undertaken a joint venture to combat tax fraud. They plan to launch the TICKET BAI system, which is basically a set of technical and legal requirements that will change the way invoices are generated. All physical and legal persons that conduct business activities under the jurisdiction of these three tax authorities and the Basque government are affected by this new system. Ticket BAI also affects all invoices, no matter if they are simplified and full, printed or electronic, as well as receipts issued when an invoice is not mandatory. In the Ticket BAI system, when it goes into effect, all sales will generate an XML- TBAI file with tax information that will be sent directly to the regional tax authorities.