TL;DR — Quick Summary

Fix IDSE IMSS errors submitting employee affiliation movements: expired e.firma certificates, rejected TXT files, and data validation failures.

Error Submitting Affiliation Movements Through IDSE

IDSE (IMSS Desde Su Empresa) is the official Mexican Social Security portal for employers to submit worker affiliation movements: new hires, terminations, and salary modifications.

Common Errors and Solutions

1. e.firma Authentication Error

Solution: Verify the .cer certificate isn’t expired, use the legal representative’s e.firma, and wait 24-48 hours after renewal for IMSS synchronization.

2. TXT File Rejected

Solution: Regenerate from updated SUA. Each line must be exactly 166 characters. Use ANSI encoding, not UTF-8.

3. Invalid Worker NSS

Solution: Verify the NSS at the IMSS portal. First-time employees need NSS registration before enrollment.

4. Duplicate Movement Error

Solution: Check worker history in IDSE. Submit termination before re-enrollment if needed.

Summary

  • Always verify your legal representative’s e.firma validity before attempting IDSE submissions.
  • Generate the TXT file from updated SUA — never edit it manually to avoid format errors.
  • A single record with an invalid NSS or incorrect RFC can reject the entire batch of movements.
  • Respect legal deadlines: new hires and salary changes within 5 business days, terminations the next business day.
  • After renewing your e.firma, wait 24-48 hours for IMSS-SAT synchronization before submitting.