Errors in these files can result in penalties and workers losing social security coverage.
| Type | Code | Deadline |
|---|---|---|
| Hire | 1 | 5 business days |
| Termination | 2 | 5 business days |
| Salary change | 7 | Within bimonthly period |
| Rehire | 8 | 5 business days |
Explore 50+ guides to solve common errors in Aspel SAE, COI, NOI and License Server
View all Aspel guides →IDSE is the IMSS platform for electronic filing of worker movements (hires, terminations, salary changes). SUA calculates bimonthly social security contributions. Both require specific file formats from your payroll system.
Employer registration mismatch, incorrect worker NSS, invalid date range, or wrong movement type.
Fixed-length .txt: employer registration (11 chars), NSS (11 digits), movement type (1=hire, 2=termination, 7=modification, 8=rehire), date, and integrated daily salary.
Update SUA's local database from IDSE. For new hires, process the IDSE filing first, then update SUA.