Tungsten Network has closely been monitoring timeframes around the inception of the mandatory usage of CFDI 4.0 and associated documents in Mexico. Mandatory usage of the CFDI 4.0 and associated documents has been postponed several times. Once again, mandatory usage of these documents has been delayed. The Mexican Tax Authorities, Servicio de Administracion Tributaria (SAT) have confirmed via a press release that the mandatory usage of the CFDI 4.0 has been extended to 1^st January 2023. This means that taxpayers can invoice using CFDI 3.3 or 4.0 until 31^st December 2022. Note that Tungsten network is ready to process both CFDI 3.3 and 4.0 invoices as well as both versions of the payment receipt. The press release published by the SAT can be found here.