The Constitutional Court of Colombia approved 90% of the pension reform on an unspecified date in 2026, opening a new stage for the Colombian pension system. ^[1] The Constitutional Court set April 1, 2027, as the date for the entry into force of the reform, changing the initial July 1, 2025, date. ^[2] Article 37 of Colombia's Law 100 of 1993 establishes a substitute indemnification for workers who reach the legal age for a retirement pension but lack the required minimum contribution weeks and declare an inability to continue contributing. ^[3] Law 2381 of 2024 modifies the rules for millions of people accessing their pension, but not all affiliates will be subjected to the new scheme. ^[4] The transition regime allows affiliates to continue retiring under the rules of Law 100 of 1993 if they meet specific tenure requirements. ^[5] Once the request is submitted, the administrator of the Flat Premium Regime where the worker made their contributions must review compliance with requirements and make the corresponding recognition. ^[6] The value of the indemnification is calculated using the formula: Weighted Average Percentage (PPC) x Weeks Contributed (SC) x Base Contribution Salary (SBC) = Indemnification. ^[7] The weeks used to calculate the indemnification cannot be counted again subsequently for another pension effect, and the substitute indemnification of old age is incompatible with the respective pensions. ^[8]