The Illinois Appellate Court has ruled against Tamara Mason, a former union representative, in her claim for unpaid vacation wages. The court determined that her claim was preempted by federal law because it required interpretation of a collective bargaining agreement (CBA). This ruling affects Mason and potentially other employees who may find their claims entangled with CBAs.

The case, Mason v. Illinois Department of Labor, was filed under docket number 1-25-1827. The court's decision was issued on November 13, 2026, and it upheld a previous ruling by the Illinois Department of Labor that dismissed Mason's claim for lack of jurisdiction.

Mason worked for the United Food and Commercial Workers Local 1546 from 1998 until her termination in 2021. She claimed entitlement to 12 weeks of unpaid vacation pay, arguing that the Union had improperly applied her vacation time to her paid medical leave during her absence due to a foot injury. The Union countered that Mason had exhausted her vacation time while on paid leave and was not entitled to additional pay.

The dispute arose when Mason filed a claim with the Illinois Department of Labor under the Illinois Wage Payment and Collection Act. The Department ruled that her claim was preempted by section 301 of the federal Labor Management Relations Act, which governs labor relations and collective bargaining agreements. The Department concluded that resolving Mason's claim would require interpreting the CBA, which is under federal jurisdiction.

Mason appealed the Department's decision, arguing that her claim could be resolved without reference to the CBA. However, the circuit court affirmed the Department's ruling, and the Appellate Court agreed, stating, "The question of whether she is owed vacation pay is 'inextricably intertwined' with the CBA, such that, but for the CBA, Mason could not bring the claim."

The Appellate Court's ruling emphasized that under the Wage Law, employers are required to pay "final compensation," including vacation pay, to separated employees. However, the court found that Mason's claim could not be adjudicated independently of the CBA, which governs vacation time and the conditions under which employees can take paid leave.

The court referenced previous cases to support its ruling, noting that claims requiring interpretation of a CBA are typically preempted by federal law. The ruling stated, "Mason's entitlement to vacation pay while on paid injury leave both derives from, and is defined by, articles VIII and X of the CBA." This highlights the importance of collective bargaining agreements in determining employees' rights to benefits.

The decision has implications for other employees who may seek to claim unpaid wages or benefits that involve the interpretation of CBAs. As the court noted, not every case involving a CBA is automatically preempted, but claims that are closely tied to the terms of a CBA may face similar challenges.

Moving forward, this ruling may influence how employees approach claims related to unpaid wages, especially when those claims involve collective bargaining agreements. Employees may need to consider the potential for federal preemption when filing claims that could require interpretation of such agreements.

As for Mason, it is unclear if she will pursue further legal action or seek to appeal the decision. The court filing did not specify any plans for an appeal or mention any related cases pending.