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

An Ontario arbitrator found that York University breached its collective agreement after a full-time summer work-study student performed duties associated with chemistry laboratory technicians whose employment had been reduced to 10 months a year.

Can Employers Use Students to Perform Unionized Work? Lessons from the York University Arbitration

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 assignment must be one contributing factor among many. The exact contractual wording creates a potentially stricter causation threshold. Employers and unions should therefore avoid replacing the negotiated wording with a looser paraphrase when analyzing a dispute.

In plain English, the contractual test can be framed as two questions:

1.Did the student, manager or other non-unit worker perform bargaining-unit work beyond the employer’s established “current practice”?
2.Was that work the significant factor leading to reduced hours, reduced pay or a lower band or classification for a bargaining-unit employee?

Based on the available reporting, the full-time summer use of the work-study student, while technicians were employed for only 10 months, crossed the contractual line. The complete award is not public, so employers should not assume facts or legal reasoning beyond what has been reported and what can be confirmed from the collective agreement itself.

Why “current practice” matters

The phrase “current practice” can be easy to overlook, but it may decide whether a staffing arrangement is permitted.

In a unionized workplace, established practice can help show how the employer and union have historically understood and applied the collective agreement. The relevant evidence may include how often students were used, which tasks they performed, how many hours they worked, whether they were supervised and whether regular employees lost work.

For example, students may have traditionally helped with:

Limited administrative work.
Basic preparation or setup.
Short-term projects.
Closely supervised learning activities.
Work performed alongside regular employees.
Tasks that did not reduce bargaining-unit opportunities.

That history does not necessarily permit the employer to expand the student role into a full-time substitute for regular bargaining-unit work. Employers should not assume that because students occasionally performed a task, students can later perform it on a larger scale, for a longer period or with less supervision.

A change in any of the following may increase risk:

The number of students used.
The number of hours assigned.
The length or recurrence of the assignment.
The level of responsibility or independence.
The percentage of the role made up of bargaining-unit duties.
The timing of the assignment.
The effect on unionized employees’ hours, pay, classification or job security.

A small historical overlap can become a contractual breach when it develops into a materially different staffing model.

Job titles do not decide who owns the work

One of the most important lessons from this dispute is that employers must look beyond labels.

Calling someone a “work-study student,” “intern,” “consultant,” “casual employee,” “volunteer,” “project assistant” or “manager” does not, by itself, determine whether the work may be assigned outside the bargaining unit.

The practical questions are:

What tasks is the person actually performing?
Who normally performs those tasks?
How much time is spent on the tasks?
How independently is the work completed?
Is the person filling a vacancy or covering a seasonal gap?
Is the person covering work that would otherwise be assigned to bargaining-unit employees?
Did unionized employees lose hours, pay, overtime, seasonal work, recall opportunities or employment as a result?

An arbitrator is likely to consider the substance of a staffing arrangement rather than relying only on the title selected by the employer. This is why HR should compare the proposed assignment against job descriptions, actual day-to-day duties, schedules, previous assignments and the collective agreement before the worker begins.

Management rights are not unlimited

Most collective agreements give employers broad rights to manage operations. York’s agreement recognizes management authority over matters such as hiring, classification, direction, transfer, layoff and the size and composition of the workforce. Those rights are still subject to the restrictions contained in the collective agreement.

Article 2.04 also permits an alleged exercise of management rights contrary to the agreement to become the subject of a grievance. In other words, a management decision does not become immune from review merely because it relates to staffing or operations.

This reflects a central principle of unionized employment:

Management may generally make operational decisions, but it must exercise those rights consistently with the collective agreement.

An employer may have a genuine business reason for using students. The employer may be facing budget pressure, a temporary increase in workload, a shortage of workers, a special project, seasonal demand or a desire to provide educational opportunities. Those reasons do not erase a negotiated restriction on who may perform the work or how the arrangement may affect bargaining-unit employees.

Operational convenience is not the same as contractual authority.

The separate notice and meeting issue

The available report indicates that the arbitrator also addressed York’s process for changing the employment category of affected positions. Article 15.01(a) of the current collective agreement requires written notice when the employment category of a position changes. The notice must generally be given two months in advance, provide reasons and be copied to YUSA. The provision also requires a meeting involving the employer, the union and the affected employee to discuss available options.

The report indicates that the arbitrator partially upheld a grievance relating to the employer’s failure to arrange the required meeting. This is a useful reminder that staffing decisions can create two separate types of risk:

A substantive breach because the work assignment itself violates the collective agreement.
A procedural breach because the employer failed to give notice, consult, disclose information or hold a required meeting.

An employer may believe that its operational decision is defensible and still lose part of a grievance because it did not follow the negotiated process.

What the ruling does not mean

It does not ban student employment

York University continues to operate work/study programs intended to give eligible undergraduate students paid on-campus experience. The decision concerns how student labour was used in relation to bargaining-unit work, not whether work-study programs are lawful.

It does not mean students can never share duties with unionized employees

Article 3.02 expressly recognizes some overlap. The contractual restriction applies where the work exceeds current practice and can be shown to be the significant factor leading to reduced hours, reduced pay or a lower band or classification.

It is not a universal rule with identical wording across Canada

The result depended on the York–YUSA collective agreement and the facts surrounding the assignment. Another collective agreement may contain different language dealing with bargaining-unit work, contracting out, students, temporary employees, supervisors, technological change, layoffs, displacement, seasonal work or overtime opportunities.

Employers must review the agreement that applies to their own workplace rather than treating this case as a blanket prohibition.

It is not primarily an employment-standards case

The reported dispute concerned the interpretation and application of a collective agreement. In Ontario, section 48(1) of the Labour Relations Act, 1995 requires every collective agreement to provide for final and binding settlement by arbitration of disputes concerning the agreement’s interpretation, application, administration or alleged violation.

Public source: Ontario Labour Relations Act, 1995, s. 48

It does not suggest wrongdoing by the student

The compliance responsibility rests with the employer. Students usually do not control bargaining-unit scope, staffing structures, employee schedules or the interpretation of collective agreements.

Why this decision matters beyond universities

The issue can arise in any unionized organization that uses workers outside the bargaining unit. Examples include:

Hospitals using students or agency personnel for support work.
Municipalities using seasonal workers for duties performed by permanent employees.
Manufacturers assigning production work to supervisors.
Nonprofits using volunteers in roles historically performed by union members.
School boards using casual or temporary staff.
Public agencies using contractors for administrative or technical work.
Employers using interns to cover vacancies or employee absences.
Organizations transferring regular work to centralized or outsourced services.
Employers introducing automated systems that reduce bargaining-unit work.

The worker category may change, but the compliance question remains the same: Does the arrangement violate the wording, purpose or established application of the collective agreement?

Seven checks before assigning work to a student or non-unit worker

1. Read the entire collective agreement

Do not review only the management-rights clause. Check recognition and bargaining-unit definitions, bargaining-unit work, contracting out, temporary employees, students and interns, job posting, layoff and recall, seniority, overtime, vacancies, organizational change, notice, consultation, grievance and arbitration provisions.

Provisions may interact. An arrangement that appears permitted under one clause may be restricted by another.

2. Identify the actual duties

Prepare a written list of what the student or non-unit worker will do. Avoid vague descriptions such as “help the team,” “provide support,” “complete special projects” or “perform other duties as assigned.”

Describe the actual tasks, frequency, expected hours, decision-making authority, required training and level of supervision. Then compare those duties with bargaining-unit job descriptions and actual workplace practice.

3. Document current practice

Ask how similar workers have been used in previous years. Record the number of students or temporary workers, their hours and assignment length, the tasks they completed, the departments in which they worked, the supervision they received and whether bargaining-unit employees lost work.

Do not rely solely on a manager’s memory. Use schedules, job postings, payroll records, previous student job descriptions, organizational charts, correspondence, previous grievances and labour-management meeting notes.

4. Test the effect on bargaining-unit employees

Look for direct and indirect consequences. Could the assignment reduce regular working hours, months of employment, overtime, call-in opportunities, recall opportunities, acting assignments, temporary vacancies, promotion opportunities, pay, classification or job security?

Even where no employee is formally laid off, the arrangement may still create a problem if employees lose paid work protected by the agreement.

5. Confirm that the role is genuinely educational

A legitimate student role should normally have a clear learning component. The employer should be able to explain what the student will learn, how the assignment supports development, who will supervise and mentor the student, what work is suitable for the student’s skill level and why the assignment is not simply a lower-cost substitute for a regular employee.

A learning plan does not override a collective agreement. It can, however, help show that the role was designed as a genuine student opportunity rather than disguised displacement.

6. Complete labour-relations review before recruitment

The best time to identify a bargaining-unit problem is before the job is posted or offered. Require HR or labour-relations approval when a proposed assignment includes duties similar to unionized work.

The written review should identify the relevant collective agreement clauses, bargaining-unit positions, current practice, expected overlap, anticipated employee impact, notice or consultation requirements, business reason, educational purpose and final approval decision.

7. Consult the union where required or strategically appropriate

Some collective agreements require notice, meetings, disclosure or consultation before particular staffing changes. Even where consultation is not expressly required, early discussion may prevent misunderstandings, grievances and operational disruption.

Consultation does not always mean the employer must obtain union consent. The exact obligation depends on the collective agreement.

Warning signs that a student assignment may create a grievance

Employers should conduct an immediate review when one or more of the following warning signs are present:

A student is covering the summer or seasonal months of an employee’s position.
A bargaining-unit employee’s contract has recently been shortened.
A regular position is vacant but has not been posted.
The student works approximately the same hours as a regular employee.
The student performs most of the same duties as a bargaining-unit classification.
The student receives limited supervision.
The assignment has continued or returned for several years.
Managers describe the student as a “replacement” or “coverage.”
Employees have lost overtime, shifts or paid months of work.
The position was created primarily because the worker costs less.
The union has previously questioned similar assignments.
The employer cannot explain the historical practice.
The job description uses vague language that hides the actual duties.
The assignment was approved without HR or labour-relations review.

One warning sign does not automatically establish a breach. Several warning signs together should cause the employer to pause the assignment and obtain advice.

A practical approval test for HR

Before approving a student or non-unit assignment, HR should be able to answer yes to each of these questions:

1.Have we identified all duties the worker will perform?
2.Have we compared those duties with bargaining-unit positions?
3.Have we reviewed the complete collective agreement?
4.Have we documented established practice?
5.Have we assessed the effect on employees’ hours, pay and opportunities?
6.Is the duration and scope consistent with past practice?
7.Is the student role genuinely developmental?
8.Have we identified notice, consultation or union-meeting obligations?
9.Has labour relations provided written approval?
10.Can we explain and defend the arrangement using records created before the assignment began?

If the answer to any question is no, the organization should pause the assignment and complete further review.

Suggested policy language

Employers may adapt the following language for a staffing, student employment or labour-relations policy:

Assignment of bargaining-unit work

Students, interns, volunteers, temporary workers, contractors, supervisors and managers must not be used to improperly displace bargaining-unit work or reduce the hours, pay, classification, employment status or contractual opportunities of bargaining-unit employees.

Before assigning duties normally or regularly performed by bargaining-unit employees, Human Resources or Labour Relations must review the applicable collective agreement, established practice, operational reason, assignment duration, supervision structure and any notice or consultation requirements.

The hiring manager must provide an accurate written description of the proposed duties, hours, duration, reporting relationship and educational purpose, where applicable. The assignment must not begin until the required review and approval have been completed.

The final wording should be reviewed against each applicable collective agreement. An organization with several bargaining units may need different procedures for different employee groups.

Records employers should retain

Good documentation can help an employer make a better decision and respond effectively if a grievance is filed. Employers should retain:

The approved job description.
The business reason for the role.
The educational reason for a student placement.
Duty comparisons.
Historical student and temporary assignments.
Schedules and expected hours.
Collective agreement review notes.
The employee-impact assessment.
Union notices and correspondence.
Meeting notes.
HR or labour-relations approvals.
Changes made after concerns were raised.
The assignment’s end date.
Any evaluation of the student’s learning or development.

Documentation created after a grievance begins may be less persuasive than a careful review completed before the assignment.

What should employers do with existing student positions?

Employers should not assume that an existing assignment is compliant merely because it has operated without a grievance. A practical review should include these steps:

1.Create an inventory of students, interns, volunteers, contractors and non-unit temporary workers.
2.Identify the duties and hours attached to each assignment.
3.Compare those duties with bargaining-unit job descriptions.
4.Review whether regular employees have lost hours, overtime or seasonal work.
5.Identify assignments that have expanded over time.
6.Review applicable collective agreement clauses.
7.Correct or redesign high-risk assignments.
8.Provide managers with clear approval procedures.
9.Document the review and resulting decisions.

An employer that identifies a concern should obtain advice before abruptly ending an assignment or changing an employee’s work. Corrective action may itself trigger notice, consultation, job-posting or employment obligations.

Frequently asked questions

Can a unionized employer hire work-study students?

Yes. A unionized employer may generally hire students unless the applicable collective agreement or another legal requirement restricts the arrangement. The employer must still examine what work the students will perform and whether the assignment affects bargaining-unit employees.

Can students perform the same tasks as unionized employees?

Sometimes. The answer depends on the collective agreement and established practice. York’s agreement expressly recognizes some overlap but restricts work beyond current practice where that work is the significant factor leading to reduced hours, reduced pay or a lower band or classification.

Is every loss of overtime a collective agreement breach?

No. The wording of the agreement and the surrounding facts matter. Some agreements expressly protect overtime opportunities, while others give the employer broader scheduling discretion. Employers should not assume overtime is either always protected or never protected.

Does a different job title keep the work outside the bargaining unit?

Not necessarily. The duties actually performed, bargaining-unit definition, historical practice and effect on employees are usually more important than the title.

Can a manager perform unionized work?

Possibly, depending on the collective agreement. Some agreements permit managers to perform limited bargaining-unit work but prohibit regular, excessive or displacement-related use.

Can a contractor perform work normally completed by union employees?

The answer depends on contracting-out language, bargaining-unit recognition, job-security protections and past practice. A contractor arrangement may be challenged even when no employee is immediately dismissed, particularly if employees lose work or opportunities protected by the agreement.

Must an employer consult the union before hiring a student?

Not in every workplace. Consultation, notice or consent requirements depend on the collective agreement. Where the proposed role overlaps with bargaining-unit work, labour-relations review should occur even if formal consultation is not clearly required.

Does the funding source make a difference?

Not necessarily. A student position may be funded through a grant, educational program, departmental budget or government initiative. The funding source does not automatically determine whether the duties may be performed outside the bargaining unit.

What does “current practice” mean?

Current practice generally refers to the way the parties have been operating under the collective agreement. Determining it may require evidence about previous assignments, hours, duties, frequency, supervision and the knowledge or acceptance of the parties. It is a fact-specific question.

Does this York University ruling apply outside Ontario?

It may be informative, but it is not automatically binding on employers in other provinces or sectors. Collective agreements and labour legislation differ. Employers must obtain advice based on their jurisdiction and their own agreement.

Key takeaway for employers

The York University arbitration is not a warning against student employment. It is a warning against treating a student program as an easy way to cover bargaining-unit work without first reviewing the collective agreement.

Before using a student, intern, contractor, temporary employee, volunteer, supervisor or manager to perform work associated with a unionized position, employers should ask three direct questions:

1.Is this consistent with the collective agreement?
2.Is this consistent with established practice?
3.Could this assignment become the significant factor leading to reduced hours, reduced pay or a lower classification for bargaining-unit employees?

If the third answer may be yes, the employer should stop and obtain a documented labour-relations review before proceeding.

A well-designed student program can create meaningful learning and employment opportunities. It should not be structured in a way that improperly replaces, displaces or reduces the work of employees whose rights are protected by a collective agreement.

Sources and verification notes

This article was prepared using the following sources and verification approach:

HR Law Canada, “York University breached collective agreement by hiring full-time work-study student,” published July 14, 2026. The report was used to understand the reported facts and outcome. No private, personalized, tracking or registration-gated link is included in this article.
York University YUSA Unit 1 Collective Agreement 2024–2027
York University Work/Study Programs
York University Collective Agreements
Ontario Labour Relations Act, 1995

The complete arbitration award could not be located in CanLII or another publicly accessible legal database as of July 19, 2026. The article therefore avoids stating the precise remedy, the arbitrator’s detailed findings on “current practice,” or factual details not confirmed by the public report and official sources.

Disclaimer

This article provides general educational information and is not legal advice. Collective agreement language, past practice, legislation and facts differ by workplace and jurisdiction. Employers should obtain qualified labour-relations or legal advice before making staffing decisions that may affect bargaining-unit work.

Canada Policy Manual does not cover Quebec.

Related resources for unionized employers

Canada Policy Manual provides additional compliance guidance for Canadian employers:

Sources

Key Takeaways

An Ontario arbitrator found that York University breached its collective agreement when a full-time work-study student performed duties associated with chemistry laboratory technicians whose employment had been reduced to 10 months a year.
The decision does not prohibit hiring students — the breach arose because the assignment went beyond established practice and affected bargaining-unit employees.
Article 3.02 of the YUSA Unit 1 collective agreement permits supervisors and students to perform bargaining-unit work, but not 'in excess of current practice' where it is the significant factor leading to reduced hours, pay or classification.
Job titles alone do not determine whether work belongs in the bargaining unit — an arbitrator examines the actual tasks performed, the effect on unionized employees and the collective agreement language.
Management rights are not unlimited; operational convenience does not override negotiated contractual restrictions on who may perform bargaining-unit work.
Employers should review seven areas before assigning work to students, interns, contractors or managers: the collective agreement, actual duties, current practice, impact on employees, educational purpose, labour-relations review and union consultation.
Warning signs include replacing seasonal recalls, covering vacancy gaps, reducing bargaining-unit hours and using students for tasks identical to unionized positions without a documented rationale.
Before proceeding with any student or non-unit assignment that may affect bargaining-unit work, an employer should ask: Is this consistent with the collective agreement? Is it consistent with established practice? Could it become the significant factor in reducing employee hours, pay or classification?

Disclaimer: This article provides general educational information and is not legal advice. Collective agreement language, past practice, legislation and facts differ by workplace and jurisdiction. Employers should obtain qualified labour-relations or legal advice before making staffing decisions that may affect bargaining-unit work.