In a landmark decision on Thursday, June 4, 2026, Mexico’s Supreme Court of Justice (SCJN) unanimously declared unconstitutional the Mexican Social Security Institute’s (IMSS) requirement that couples in common-law relationships prove at least five years of cohabitation to qualify for widow(er) pensions.

This ruling marks a significant step toward recognizing diverse family structures and ensuring fairer access to social security benefits beyond traditional marriage. The Court emphasized that conditioning economic support on the length of a formal union imposes an unnecessary and discriminatory burden on those who choose alternative family models.

Key points from the SCJN’s decision include:

– The five-year cohabitation rule was deemed a disproportionate barrier that violates fundamental rights, including social security and personal autonomy.
– The Court highlighted that privileging civil marriage over other legitimate forms of partnership undermines the diversity of Mexican families.
– While beneficiaries must still prove a genuine and formal relationship with the deceased insured person, the rigid time requirement has been removed.
– The focus now shifts to the nature and reality of the relationship rather than a strict timeline.

This ruling aligns with broader efforts to modernize social policies and promote inclusivity, ensuring that the State respects all family configurations equally. For many couples, especially those who may face bureaucratic hurdles or social stigma, this decision opens the door to more dignified and equitable treatment under Mexico’s social security system.

As Mexico continues to evolve its social infrastructure, including innovative transport projects like Puebla’s cable car system that aim to connect and empower communities, this Supreme Court ruling reflects a parallel commitment to social justice and inclusion in public policy.