Can You Be Fired for Medical Reasons or Restrictions in Ontario?

Employees often worry about job security when facing a serious illness, injury, or ongoing medical restrictions. Whether it’s a short-term medical leave, a gradual return to work, or permanent limitations, many workers ask the same question: can my employer fire me because of my medical condition? 

In Ontario, the answer is nuanced. While employers are not required to employ someone forever regardless of circumstances, Ontario law provides strong protections for employees dealing with medical conditions or disabilities. Terminating someone because of a medical issue can expose an employer to serious legal consequences. 

Medical Conditions Are Protected Under Ontario Law 

In Ontario, disability is a protected ground under the Human Rights Code. That means an employer cannot use a medical condition or disability as a reason to treat an employee unfairly, deny opportunities, or terminate their employment. 

The legal definition of disability is intentionally broad. It includes physical injuries and illnesses, chronic conditions, mental health issues, and both temporary and permanent medical limitations. Importantly, these protections apply even if an employee needs time off work or can no longer perform their job in the same way as before. 

Put simply, being sick, injured, or disabled cannot be used as a basis to fire someone. 

Medical Leave Alone Is Not a Valid Reason for Termination 

Many employees worry that if they are off work for “too long” due to medical reasons, they automatically lose their job. That is not how Ontario law works. 

Ontario’s Employment Standards Act, 2000 (ESA) provides employees with job-protected medical leaves, including sick leave and long-term illness leave. While these statutory leaves have defined time limits, employers are prohibited from terminating, disciplining, or penalizing an employee simply for taking a legally protected leave. 

Even beyond the ESA, courts and human rights tribunals have repeatedly found that terminating an employee because they are on medical leave or recovering from an illness is often discriminatory. The key point is this: being away from work for medical reasons, even for a prolonged period, does not automatically justify termination. 

Employers must look at the individual circumstances, the employee’s prognosis, and whether accommodation is possible before ending the employment relationship. 

The Employer’s Duty to Accommodate Medical Restrictions 

When an employee has medical restrictions, the employer has a legal duty to accommodate. This means the employer must make reasonable efforts to adjust the job or workplace so the employee can continue working, if possible. 

Accommodation can take many forms, including modified duties, reduced or flexible hours, adjusted schedules, temporary reassignment, or gradual return-to-work plans. The focus is on helping the employee perform the essential parts of their job, not forcing them out. 

This process is shared. Employees are expected to cooperate by providing reasonable medical information about their functional limitations or restrictions. They are not required to disclose their diagnosis. Employers may ask what an employee can and cannot do, but employees are generally not obligated to reveal the specific medical condition causing those limitations. 

At the same time, employers must actively explore accommodation options. They cannot simply assume accommodation is impossible or inconvenient and move straight to termination. 

What Does “Undue Hardship” Really Mean? 

An employer’s duty to accommodate is not unlimited. The law recognizes that accommodation is required only up to the point of undue hardship. 

In practical terms, undue hardship means that accommodation would cause the employer serious difficulty. This is a high threshold. Under Ontario law, it is assessed based on limited factors such as significant financial cost, serious health or safety risks, or a fundamental interference with the operation of the business. 

Minor inconvenience, disruption to schedules, coworker resentment, or a preference for efficiency do not qualify as undue hardship. Employers must be able to show that they seriously considered and attempted accommodation before claiming it was not possible. 

When Can Termination Be Lawful Despite a Medical Condition? 

There are limited situations where termination connected to a medical condition may be lawful. 

If an employee cannot perform the essential duties of their role even after reasonable accommodation, and further accommodation would cause undue hardship, termination may be permitted. 

In rare cases, an employment contract may be considered “frustrated” where a medical condition makes a return to work impossible in the foreseeable future. This is a high legal bar and depends heavily on medical evidence. Even then, employees are often still entitled to statutory termination and severance pay under the ESA. 

These situations are exceptions, not the rule. The burden is on the employer to justify the termination. 

Termination for Unrelated Reasons 

Having a medical condition does not make an employee immune from termination. An employer may still terminate employment for legitimate, non-discriminatory reasons, such as company-wide layoffs, restructuring unrelated to the disability, performance issues that are not linked to the medical condition, or misconduct. 

However, when a termination occurs shortly after a medical leave, accommodation request, or disclosure of restrictions, courts and tribunals closely scrutinize the employer’s explanation. Timing matters. 

What to Do If You Were Fired After Disclosing a Medical Condition 

If you were terminated shortly after taking medical leave, requesting accommodation, providing medical restrictions, or returning from disability leave, you may have claims for wrongful dismissal, human rights damages, or both. 

These cases often involve compensation for lost income and damages for injury to dignity, and in some cases, punitive damages. Because employment law and human rights law overlap in complex ways, early legal advice is critical. 

How We Can Help 

At Lecker & Associates, our employment lawyers regularly represent employees who have been terminated while dealing with medical conditions, disabilities, or accommodation issues. 

We can assess whether your termination was lawful, explain your rights and entitlements, and pursue fair compensation through negotiation or litigation when necessary. 

📞Call 416-223-5391, email intake@leckerslaw.com, or book your no-charge assessment today.