WSIB Appeal Gap Analysis: 139,000 Ontario Workers Per Year Do Not Appeal Denials

Executive Summary

We analyzed official WSIB data (2020-2026) and WSIAT decisions (1987-2026). Key findings:

Methodology

Our research analyzed publicly available data from WSIAT’s Open Data Portal: 98,992 decisions from 1987-2026.

Analysis shows that 69% of WSIAT appeals result in favorable outcomes for workers. This success rate indicates that many denied claims may have merit when reviewed at the tribunal level.

WSIB data shows approximately 31% of claims are allowed at the initial decision stage, with 68% receiving denials. Given the high WSIAT success rate, this raised questions about the appeal rate.

We obtained WSIB’s Safety Check data:

• Registered Claims (2020-2026): Total claims filed with WSIB
• Allowed Claims (2020-2026): Claims approved by WSIB at initial decision

The calculation methodology:

Denied Claims = Registered - Allowed
Appeal Rate = WSIAT Appeals ÷ Denied Claims
Appeal Gap = Denied Claims - WSIAT Appeals

Claims Processing Flow

Average annual flow for WSIB claims (2020-2025 data):

207,735 WORKERS FILE CLAIMS
      ↓
   WSIB PROCESSES
      ↓
66,177 ALLOWED (31.8%)
      ↓
141,558 DENIED (68.2%)
      ↓
   APPEAL STAGE
      ↓
2,475 APPEAL TO WSIAT (1.75%)
      ↓
   WSIAT DECIDES
      ↓
1,708 SUCCEED AT WSIAT (69%)
      
139,083 WORKERS DO NOT APPEAL

Year-by-Year: The Appeal Gap Trend

The data shows a consistent pattern: denial numbers increased from 2020 to 2022, while appeal rates remained relatively stable. From 2020 to 2022, the appeal gap increased by 22% (135K → 166K workers).

Analysis: WSIAT Success Rate and Appeal Patterns

The data reveals a significant discrepancy:

This statistical pattern suggests:

1. Initial vs. Appeal Outcomes: WSIB’s initial denial rate (68%) contrasts with WSIAT’s reversal rate (69%)
2. Appeals Process Effectiveness: WSIAT demonstrates effectiveness in reviewing cases
3. Access Barriers: The low appeal rate (1.75%) indicates significant barriers to accessing the appeals process

Factors Contributing to Low Appeal Rates

Based on research and data analysis, several factors may contribute to the low appeal rate:

1. Limited Awareness of Appeal Options

WSIB denial letters inform claimants of their right to object within 6 months. However, the distinction between internal objection and formal WSIAT appeal may not be clear to all claimants.

2. Legal Complexity and Representation

WSIAT operates as a quasi-judicial tribunal with formal procedures. Access to legal representation may be limited for some workers. Community legal clinics serve this population but face capacity constraints.

3. Economic and Time Constraints

Workers in precarious employment situations (gig workers, temporary workers, multiple job holders) may face challenges taking time for appeal proceedings. The WSIAT process can take 6-18 months from filing to hearing.

4. Language and Cultural Barriers

Workers for whom English is not a first language may face additional challenges navigating the appeals system. While translation services exist, awareness and access vary.

5. Physical and Emotional State

Claimants denied benefits are often dealing with:

• Ongoing injury or illness
• Loss of income
• Medical treatment requirements
• Previous administrative processes with WSIB

The cumulative effect of these factors may reduce capacity to pursue appeals.

Cross-Tribunal Comparison: WSIAT vs HRTO

For context, we analyzed 62,093 decisions from the Human Rights Tribunal of Ontario (HRTO):

The data shows WSIAT has significantly higher success rates compared to HRTO, indicating that the WSIAT appeals process produces favorable outcomes for a substantial majority of appellants.

Injury Type Analysis

From our analysis of 98,992 WSIAT decisions, the most common injury types in appeals are:

For every 100 back injury denials at the initial WSIB decision:

• 2 workers appeal to WSIAT (based on 1.75% average appeal rate)
• Of those 2 appeals, approximately 1.4 succeed (based on 69% WSIAT success rate)
• 98 workers do not pursue appeals

Implications for Workers

If You Have Received a WSIB Denial:

1. Statistical context: 141,558 workers/year receive WSIB denials
2. Appeal success rate: 69% of WSIAT appeals succeed
3. Time limits: 6 months from denial date to file WSIAT appeal
4. Resources available: Community legal clinics and workers’ rights organizations provide support

How to Access Appeal Support:

1. Act within timeline: WSIAT requires appeals within 6 months of WSIB decision
2. Seek legal support: Contact community legal clinics early in the process
3. Use available resources:
   • WSIAT NEL Benefits Guide (based on 20,680 analyzed cases)
   • Back Injury Appeal Guide (based on 13,407 analyzed cases)
   • WSIAT Templates (downloadable appeal templates)

Community Resources:

• Community Legal Clinics: Legal Aid Ontario
• Workers’ Action Centre: Workers’ Action Centre
• Injured Workers Online: IWO Support Network
• WSIAT Official Site: WSIAT.ca

Policy Considerations and Recommendations

For Workers:

• Consider appealing: WSIAT appeals have a 69% success rate
• Seek early support: Contact legal clinics within the 6-month appeal window
• Connect with peer support: Organizations like Injured Workers Online provide community support

For Advocates:

• Focus on access barriers: The data suggests the primary challenge is accessing the appeals process, not WSIAT outcomes
• Support process simplification: Phone-based appeals, video hearings, plain-language documentation
• Advocate for legal clinic funding: Community legal clinics face capacity constraints

For Policy Makers:

1. Enhance appeal communication: Improve clarity of appeal rights and processes in denial communications
2. Increase accessibility: Develop multi-channel appeal support (phone, video, in-person)
3. Expand translation services: Ensure accessibility for workers whose first language is not English
4. Review decision patterns: Regular analysis of initial decision vs. appeal outcomes
5. Fund community legal clinics: Address capacity constraints in legal support services

Data Sources and Analysis

All data used in this research is publicly available:

• WSIB Registered Claims: WSIB Safety Check (accessed April 30, 2026)
• WSIB Allowed Claims: WSIB Safety Check (accessed April 30, 2026)
• WSIAT Decisions: WSIAT Open Data Portal (accessed April 29, 2026)
• HRTO Decisions: Tribunals Ontario Open Data (accessed April 30, 2026)

Download Research Data:

• Appeal Gap Analysis Data (JSON)
• 98,992 WSIAT Decisions Analysis
• Cross-Tribunal Comparison

Share This Research

139,083 workers/year do not appeal WSIB denials. Understanding the appeal process and success rates is important.

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Future Research

This analysis is part 1 of ongoing research into WSIB claims and appeals. Planned research includes:

1. Part 2: ODSP Access Patterns - Analysis of ONSBT data on denied WSIB claimants applying for social assistance
2. Part 3: Industry-Specific Patterns - Appeal rates by industry classification
3. Part 4: Injury Type Analysis - Detailed analysis by injury type (back, shoulder, mental stress, etc.)
4. Part 5: Decision Pattern Analysis - Examination of decision-making patterns over time

Contact Information

For questions about this research or to share your experience:

• Email: empowrapp08162025@gmail.com
• Confidentiality: All communications are treated as confidential
• Support Resources: We can provide information about legal clinics and advocacy organizations

Research Team: 3mpwrApp Data Investigation Team
Publication Date: April 30, 2026
License: CC BY 4.0 (Attribution required for reuse)