Since January 1, 2014, a crucial document has become the cornerstone of Mexican real estate transactions: the CFDI Complemento (Comprobante Fiscal Digital por Internet con Complemento). This digital tax receipt was introduced as part of Mexico's modernization of its tax system and applies to all property purchases from 2014 onward. Many property owners only realize its significance when complications arise—especially those who purchased property in 2014-2015, during the transition period.

The CFDI Complemento serves as your digital proof of tax compliance, replacing the outdated paper-based system phased out at the end of 2013. For any property purchased or sold since 2014, this electronic document is not optional—it's a mandatory requirement that validates your transaction with Mexico's tax authority (SAT). Failure to obtain it could result in serious legal and financial consequences.