Background On August 1, 2025, the Tax Administration Service (“SAT”) uploaded to the Mexican Foreign Trade Digital Window (“VUCEM”) the electronic prescribed form for the “Customs Value Declaration”. This form also triggers the effectiveness of the obligation set forth in Article 81 of the Regulations to the Customs Law, which had been dormant since publication in 2015. The transmission of the Electronic Customs Value Declaration, along with its annexes, will be mandatory starting on December…