What is SSDMF?

Summary

This article explains the Social Security Death Master File (SSDMF) check, which compares an individual’s Social Security number against a list of numbers belonging to deceased individuals. It outlines what a match means, common causes such as data-entry errors, and the recommended next steps. It also clarifies that a non-match does not confirm the accuracy of the Social Security number on file.

Overview

The Social Security Death Master File (SSDMF) check compares an individual’s Social Security number (SSN) against a database of numbers belonging to deceased individuals. When a match is found, the system displays the matching Social Security number along with the name and the dates of birth and death recorded for that individual.

What a Match May Mean

A match to the SSDMF can indicate the use of a fraudulent Social Security number. In our experience, however, most matches result from a typo in the original HR paperwork. In the event of a match, we advise conducting a thorough review of the employee’s records or consulting directly with the employee to verify the accuracy of the Social Security number on file

Important Note About Non-Matches

We do not verify whether the Social Security number provided matches the individual’s actual Social Security number. Instead, our process only checks to ensure that the number is not listed in the Social Security Death Master File (SSDMF). This means we confirm the number has not been reported as deceased according to the SSDMF records, but we do not authenticate the accuracy or validity of the number beyond that.