25/09/2026
Risk Premium Monitoring and Reduction
Why is Monitoring the Risk Premium Crucial?
Regularly monitoring the Workplace Risk Premium (Prima de Riesgo) before the IMSS prevents unnecessary tax overcharges. When a workplace accident occurs, the premium increases. However, by law, this premium cannot drop abruptly; it must decrease gradually and progressively (by a maximum of 1% per year). Therefore, if the company completed a calendar year with zero workplace accidents, immediate action must be taken. Missing this window means carrying an inflated financial burden that does not reflect the company's actual safety record.
Key Steps for Client Orientation:
1. Sickness and Injury Audit (January): Review all medical files from the previous calendar year (ST-7 and ST-2 forms). It is vital to ensure no cases remain open and to remember that commuting accidents do not count toward the premium calculation.
2. Calculation and Reduction Caps: Use the SUA system to calculate the new premium. Legally, the annual reduction is capped at a maximum of 1% nominal compared to the previous year, until reaching the legal minimum baseline of 0.50000%.�
3. Timely Filing (February): The annual premium declaration must be formally submitted during the month of February via the online IDSE platform.
4. Defense Against Rectifications: If IMSS rejects the lower rate due to an unrecorded or misclassified incident, companies must appeal through a Disagreement Resource (within 15 business days) or a Nullity Lawsuit (within 30 business days).