Automatic reconciliation between payroll and social security.
Comparing the contribution filing against the payroll run every month, without doing it by hand. Validation rules and what to do with the differences.
Reconciling the payroll run against the social-security contribution filing is one of those controls everyone knows should be done every month and almost nobody does, because manually it takes hours and the result is usually that everything is fine. Until the month it is not, and the difference has been accumulating for a year.
Automating the comparison is straightforward when both files can be exported in a structured format. The routine matches by ID number and checks four things: that every active employee in payroll is in the filing, that every contributor in the filing is still active in payroll, that the contribution base matches the calculated one, and that hires, exits, sick leave and vacations are reported on both sides.
The differences that appear fall into predictable categories. Employees hired around the close who ended up in one file but not the other. Contribution bases that differ because a concept that should have been included was excluded, or vice versa. Changes reported with different dates. Contributor types wrongly assigned, which is among the costliest errors because it affects the contribution percentages.
The important design is not the comparison but the output. A report that says "there are 47 differences" is useless. The useful report classifies each difference by type, quantifies it in currency where applicable, and prioritizes by risk: the ones that produce an insufficient contribution go first, because those are the ones that produce penalties.
On frequency, the recommendation is to run the reconciliation before paying the contribution filing, not after. A difference detected before is corrected in the same period; detected afterwards it requires a correction with its own paperwork and, in some cases, with interest.
A scope warning is in order: automatic reconciliation detects inconsistencies between two sources; it does not determine which of the two is right. That decision still requires technical judgment about the nature of each concept and its regulatory treatment. The tool reduces the search work; it does not replace the specialist's judgment.
In the projects where we have implemented this control, the most valuable result was not the time saved but the change in posture: the department went from discovering differences in annual audits to correcting them in the month they occur.