Can Employers Use Students to Perform Unionized Work? York Ruling Lessons

A recent Ontario labour arbitration involving York University has attracted attention because of a striking headline: the university breached a collective agreement by hiring a full-time work-study student. That headline is easy to misunderstand. The decision does not mean that York University—or any other unionized employer—is prohibited from hiring students. It also does not mean that a work-study student can never perform duties similar to those performed by unionized employees. The real issue was narrower and more important for employers: Can an employer assign bargaining-unit work to a student when the arrangement goes beyond established practice and the assignment is the significant factor leading to reduced work or pay for unionized employees? According to reporting published by HR Law Canada on July 14, 2026, York University assigned a work-study student full-time summer hours covering duties associated with chemistry laboratory technicians whose employment had been reduced to 10 months of the year. An Ontario arbitrator found that the university’s handling of the arrangement breached provisions of the collective agreement between York University and the York University Staff Association, commonly known as YUSA. The available report also indicates that the arbitrator partially upheld the grievances. That distinction matters. It means the union did not necessarily succeed on every allegation. Because the complete arbitration award could not be located in a public legal database as of July 19, 2026, this article does not attempt to describe every claim, every finding, the arbitrator’s full reasoning or the precise remedy. For employers, the practical lesson is simple: A student title, temporary contract or special funding arrangement does not automatically allow an employer to move work outside a bargaining unit. The employer must examine the collective agreement, established workplace practice, the duties being assigned and the effect on unionized employees. This article explains what happened, why the wording of the collective agreement mattered, what the ruling does not mean and what employers should check before assigning work to students, interns, contractors, temporary employees, volunteers, supervisors or managers. What happened at York University? York University operates work/study programs that provide eligible undergraduate students with paid on-campus employment intended to build professional skills and complement their education. Graduate students are not eligible for York’s Work/Study Program. These programs are framed as experiential education rather than simply as a source of low-cost labour. Public source: York University Work/Study Programs Work-study programs are common in universities and colleges. They can benefit students by providing income, experience, references and exposure to professional workplaces. They can also help institutions complete projects and provide services. The York University dispute did not arise merely because a student was hired. The concern was the relationship between the student’s summer assignment and the work of unionized chemistry laboratory technicians. Based on the publicly available report: The work-study student worked full-time hours during the summer. The student covered duties associated with chemistry laboratory technicians. The affected technicians’ employment had been reduced to 10 months of the year. The arbitrator partially upheld the grievances and found a collective agreement breach relevant to the use of the student and the employer’s process. This distinction is essential. Hiring a student was not, by itself, the prohibited act. The problem arose because the assignment was connected to bargaining-unit work and to reduced paid work for employees covered by the collective agreement. What did the collective agreement say? York University’s current publicly available YUSA Unit 1 collective agreement covers employees performing office, clerical, laboratory or technical work within the agreement’s defined geographic scope. The recognition language applies within a 20-kilometre radius of Metropolitan Toronto, subject to the agreement’s stated exclusions and qualifications. Public source: YUSA Unit 1 Collective Agreement 2024–2027 Article 3.02 recognizes that supervisors, managerial staff and work/study students regularly and normally perform some work that is also performed by bargaining-unit members. That recognition is important because it shows that the agreement does not create an absolute wall around every task performed by a unionized employee. However, Article 3.02 also limits that overlap. It prohibits those individuals from performing bargaining-unit work “in excess of current practice” where that work can be shown to be the significant factor leading to: Reduced hours of work. Reduced pay. A lower band or classification for an employee. The use of the words “the significant factor” matters. The agreement does not say merely that the