Interest Arbitration — Ontario Employment Law
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About Interest Arbitration
In Ontario's system of labour relations, collective bargaining sometimes reaches a stalemate. When an employer and a union cannot agree on the terms of a new collective agreement, they typically face the prospect of a strike or lockout. However, for essential workers providing vital public services, work stoppages are against the law. In these specific circumstances, the bargaining impasse is resolved through a specialized legal mechanism known as interest arbitration.
Unlike grievance arbitration, which involves interpreting an existing collective agreement to settle a specific workplace dispute, interest arbitration is a process used to write the actual terms of a new contract. When negotiations permanently break down, an independent arbitrator or a tripartite arbitration board is appointed to evaluate proposals and impose a final, binding collective agreement on both parties.
In Ontario, mandatory interest arbitration applies primarily to the broader public sector. This includes hospital and care home employees governed by the Hospital Labour Disputes Arbitration Act (HLDAA), as well as police officers, firefighters, and certain transit workers regulated under specific provincial statutes. Although much less common, private-sector unions and employers can also voluntarily agree to use interest arbitration as an alternative to engaging in a strike or lockout.
During hearings, the arbitration board evaluates detailed briefs on wages, benefits, and workplace policies. Arbitrators do not simply invent terms; they are guided by statutory criteria and established legal principles. They typically assess the employer's ability to pay, general economic conditions, inflation, and the "replication principle"—attempting to replicate the financial settlement the parties themselves would likely have reached through free collective bargaining. Comparative data from similar workplaces across the province is heavily weighed.
Decisions made by interest arbitration boards are highly consequential and binding. While appeals on the merits are rare, an award or the appointment process of an arbitrator can occasionally be challenged via judicial review if there are allegations of bias, breaches of natural justice, or jurisdictional errors. Because this specialized process legally binds an entire workforce to a set of terms for years, labour relations disputes are highly complex and outcome-dependent. Unions and employers approaching a bargaining deadlock should seek strategic guidance from qualified legal professionals to prepare their cases.
Frequently Asked Questions
What is the difference between interest arbitration and grievance arbitration?
Grievance arbitration is used to resolve disputes over how an active, existing collective agreement is interpreted or applied. Interest arbitration is used when bargaining fails, serving as a substitute for a strike to create the actual terms and conditions of a brand-new collective agreement.
Who must use interest arbitration in Ontario?
It is mandatory for vital essential workers who are legally prohibited from striking. This typically includes hospital workers, nursing home staff, police officers, and firefighters operating under statutes like the Hospital Labour Disputes Arbitration Act (HLDAA).
How do arbitrators decide how much to award in wage increases?
Arbitrators usually follow the "replication principle," trying to award what the parties would have realistically negotiated on their own without a strike. They arrive at this by reviewing established economic data, local inflation rates, the employer's financial health, and comparative settlements of similar workers in the province.
Can an employer claim they don't have the budget for union demands during interest arbitration?
Yes, an employer can raise an "inability to pay" argument during the proceedings. However, adjudicators require rigorous and detailed financial evidence to support this claim, not simply statements about municipal or corporate budget preferences.
Is it possible to appeal an interest arbitration decision?
The resulting collective agreement is binding and generally cannot be appealed just because a party dislikes the financial outcome. However, a judicial review can be sought in the Divisional Court if the arbitration board made a fundamental jurisdictional error, failed to provide procedural fairness, or demonstrated bias.
When should we talk to a lawyer about an interest arbitration process?
Unions and management should engage specialized labour counsel well before negotiations completely deteriorate into a deadlock. A lawyer is required to help strategically draft the voluminous financial briefs and comparators needed before the arbitrator is even appointed.
Common Scenarios
- A union representing hospital nurses hits a total deadlock with the hospital network regarding retroactive wage increases; because the Hospital Labour Disputes Arbitration Act prevents a strike, the dispute is referred to an interest arbitrator to finalize the new wages.
- A municipality claims it cannot afford the benefit enhancements demanded by the firefighters' association and submits financial evidence to an arbitration board tasked under provincial fire legislation with writing their new collective agreement.
- A union files for judicial review in the Divisional Court because they believe the Minister of Labour's appointment of a specific chair to their interest arbitration board creates a reasonable apprehension of bias against the workers.
What You Should Know
- Carefully track all comparative wage settlements in your specific industry during the term of your current agreement, as historical data across similar workplaces is the most persuasive evidence for an arbitrator.
- If raising an 'ability to pay' argument as an employer, ensure you are prepared to disclose extensive underlying financial documentation, as bare assertions of budget shortfalls are routinely dismissed.
- Pay strict attention to the statutory deadlines for picking a union or employer nominee for a tripartite arbitration board, as failing to act can result in the government appointing one for you.
- Do not approach this process informally; because the resulting framework dictate operations for years, consulting a labour lawyer with specific experience in interest arbitration is essential for preparing written arguments.
Featured Cases
Labourers’ International Union of North America, Local 3000 v. Primacare
2023 ONSC 1628 (CanLII) · 2023-03-23Judicial Review of Interest Arbitration Award
This is a judicial review of an interest arbitration award under the Hospital Labour Disputes Arbitration Act. The Divisional Court reviewed whether the arbitration board's decision on wage adjustments was reasonable and adequately explained, applying the standard of review principles from Vavilov. The court upheld the board's reliance on comparator agreements and its consideration of economic conditions and pandemic impacts.
Ontario Nurses’ Association v. Burloak Long Term Care Home
2022 ONSC 4098 (CanLII) · 2022-08-10Judicial Review of Interest Arbitration Award
This is a judicial review of an interest arbitration award under the Health Labour Dispute Arbitration Act (HLDAA) regarding the establishment of a disability income protection plan in a first collective agreement. The Divisional Court reviewed whether the arbitrator's application of the replication principle and consideration of statutory criteria were reasonable. The court upheld the award, finding the arbitrator's reasons were adequate and the decision fell within the range of acceptable outcomes.
Orillia Soldiers Memorial Hospital v. Ontario Public Service Employees Union, OPSEU Local 383
2018 ONSC 5747 (CanLII) · 2018-09-27The Divisional Court dismissed an application for judicial review of an interest arbitration award regarding travel time compensation for multi-site work. The court found that the Arbitration Chair acted within their authority, provided procedural fairness, and that the award was reasonable under the applicable legal standards.
The Corporation of the City of St. Catharines v The St. Catharines Professional Fire Fighters’ Association
2015 ONSC 6046 (CanLII) · 2015-10-01Judicial Review: Firefighters' 24-Hour Shift Arbitration
This is a judicial review of an interest arbitration award imposing a 24-hour shift schedule for firefighters on a two-year trial basis. The Divisional Court upheld the Arbitration Board's decision as reasonable, finding that the Board reasonably applied principles of comparability and replication and properly addressed the City's health and safety concerns.
St. Gabriel’s Villa of Sudbury v Ontario Nurses’ Association
2015 ONSC 3459 (CanLII) · 2015-05-28Judicial Review of Interest Arbitration: Comparator Groups
This is a judicial review of an interest arbitration board's decision in a labour dispute between a hospital and a nurses' union. The employer challenged the board's reasons for selecting a comparator group for wage determination and its application of statutory criteria under the Hospital Labour Disputes Arbitration Act.
Canadian Union of Public Employees, Air Canada Component v. Air Canada
2014 ONSC 2552 (CanLII) · 2014-04-23Judicial Review: Arbitrator's Supplementary Award on Per Diems
This is a judicial review of an interest arbitration award regarding per diem rates for low-cost airline cabin personnel. The union challenged the arbitrator's supplementary award, arguing the arbitrator was functus officio and lacked jurisdiction to impose mainline rates. The Divisional Court upheld the arbitrator's decision, finding it reasonable and consistent with the original award's intent to maintain cost competitiveness.
Service Employees International Union v. The Participating Nursing Homes
2013 ONSC 4650 (CanLII) · 2013-07-16Judicial Review of Interest Arbitration Award
The Divisional Court dismissed a union's application for judicial review of an interest arbitration award under the Hospital Labour Disputes Arbitration Act. The court upheld the arbitrator's findings regarding the employer's ability to pay, economic conditions, and the use of comparable settlements, applying a reasonableness standard. The court also awarded $10,000 in costs to the respondents due to the complexity of the case.
Revera Retirement v. T.A.
2010 ONSC 3041 (CanLII) · 2010-06-08Judicial Review of Interest Arbitration Award
This is a judicial review of an interest arbitration award under the Hospital Labour Disputes Arbitration Act. The employer challenged the arbitration board's decision on the grounds of procedural fairness and jurisdiction, arguing the board relied on information not presented by the parties. The court addressed the content of the duty of fairness in interest arbitration.
Ross Memorial Hospital v. Canadian Union of Public Employees, Local 1909
2007 CanLII 39896 (ON SCDC) · 2007-09-19Judicial Review of Hospital Interest Arbitration
This is a judicial review of an interest arbitration board's decision regarding salary levels for laboratory technicians at Ross Memorial Hospital. The Divisional Court dismissed the application for judicial review, finding that the board did not fail to consider statutory requirements such as the replication principle and comparability, and that its decision was not unreasonable.
Canadian Union of Public Employees v. Ontario
2000 CanLII 16932 (ON CA) · 2000-11-21CUPE v Ontario: Judicial Review of Arbitrator Appointments
This is a judicial review application brought by the Canadian Union of Public Employees challenging the Minister of Labour's discretionary power to appoint chairs for interest arbitration boards under the HLDAA. The union argued that the Minister's practice of appointing retired judges created a reasonable apprehension of bias and breached principles of natural justice and procedural fairness, particularly given the government's financial interest in the arbitration outcomes.
Re 538414 Ontario Ltd. and London & District Service Workers Union, Local 220 et al.
1987 CanLII 4373 (ON SC) · 1987-01-16This is a judicial review application concerning an interest arbitration award between an employer and a union. The central issue is whether the arbitration board committed a jurisdictional error by refusing a second hearing to consider the employer's financial evidence regarding its ability to pay, and whether it complied with statutory reporting requirements under the Public Sector Prices and Compensation Review Act, 1983.
City of Welland v. Welland Fire Fighters Association, Local 481, International As8ociation of Fire Fighters et al.
1982 CanLII 1833 (ON SC) · 1982-10-29This is a procedural ruling concerning jurisdiction and contracting out in the context of interest arbitration between the City of Welland and the Welland Fire Fighters Association. The court addressed the application of the Fire Departments Act, R.S.O. 1980, c. 164, to the arbitration process.
Ontario Nurses' Association v. Haldimand-Norfolk Health Unit
1981 CanLII 71 (ON CA) · 1981-01-08Interest Arbitration Clauses in Collective Agreements
This is a judicial review or appeal concerning the validity and enforceability of interest arbitration clauses within collective agreements under the Ontario Labour Relations Act. The court addressed whether such clauses are permitted, the jurisdiction of arbitration boards to include them, and the interaction with statutory freeze periods and bridging provisions. This decision was appealed to the Supreme Court of Canada, which reversed it (Ontario Nurses' Association v. Haldimand-Norfolk Health Unit, [1983] 2 SCR 6). The Supreme Court ruled that the arbitration boards had jurisdiction to hear the interest arbitrations and were authorized to insert the interest arbitration clause into the new collective agreements. The Court of Appeal's order quashing the inclusion of this provision was set aside.
Re Sudbury Memorial Hospital and Ontario Public Service Employees Union Local 619 et al.
1980 CanLII 1566 (ON SC) · 1980-09-19This is an interest arbitration proceeding under the Hospital Labour Disputes Arbitration Act involving the Ontario Public Service Employees Union and Sudbury Memorial Hospital.
Re Metropolitan Toronto Police Association and Board of Commissioners of Police for Metropolitan Toronto
1980 CanLII 1683 (ON SC) · 1980-04-28A judicial review application concerning the jurisdiction of an interest arbitrator under the Police Act and related regulations to determine the terms of a collective agreement for police officers.
Re St. Joseph's General Hospital, Thunder Bay and Ontario Nurses' Association et al.
1978 CanLII 1344 (ON SC) · 1978-12-12This is an interest arbitration proceeding involving St. Joseph's General Hospital and the Ontario Nurses' Association under the Hospital Labour Disputes Arbitration Act.