Dublin City Council is facing a multi-million euro bill after a group of its employees were mistakenly designated to the wrong class of PRSI, RTÉ News understands.
It is believed that as many as 180 employees were attributed to Class A when they should have been on Class D.
The variance between the two classes is believed to be in the region of €20m.
In a statement to RTÉ News, Dublin City Council said it is "aware of the issue of the misclassification of a small number of employees for PRSI purposes, and is considering how the matter can be addressed."
The statement added: "The Council has no further comment to make."
Accordingly, it is currently unclear if the staff who were misclassified have been informed, when the misclassification first took place, or how the error was identified.
A statement from the Department of Housing and Local Government said: "As the employer in this case, this is entirely a matter for Dublin City Council."
