Teachers in the Madison School District said the Board of Education there violated the law by imposing a 10% pay cut last week that is retroactive to the beginning of the current school year.
Bobby Robinson, president of the Madison Education Association, which represents 77 teachers and other professional employees, said the union plans to file a lawsuit Monday.
He cited a May ruling in a case that said employers can't apply a pay cut retroactively.
Robinson said he raised those issues with the district administration after the board took action Monday, but paychecks teachers received Friday reflected the deduction. District and board leaders could not be reached Friday.
"They ignored it," Robinson said.
The case cited stems from a 2007 dispute between Detroit Public Schools and Teamsters Local 214, which represents school security guards, among other district employees. The cases aren't similar, but in making his ruling Administrative Law Judge Doyle O'Connor addressed the issue of retroactive pay cuts.