Medical Inability to Work in Ontario: How Courts Assess Earning Capacity
- Lamothe Law
- Mar 15
- 4 min read
Clients are often surprised to learn that, in Ontario family law, having a medical diagnosis does not automatically mean the court will accept that someone cannot work.
Whether the issue arises in child support, spousal support, or imputation of income, courts take a careful and evidence‑based approach when one party claims they are unable to work for medical reasons. Understanding how these claims are assessed can help parties set realistic expectations — and avoid costly mistakes.
The Core Legal Question
When someone says they cannot work because of health issues, the court is not simply asking:
“Does this person have a medical condition?”
Instead, the real question is:
Does the medical evidence show that the condition materially limits the person’s ability to earn income, and to what extent?
Ontario courts focus on earning capacity, not diagnoses or labels.
The Legal Framework Courts Use
The leading Ontario case in this area is Drygala v. Pauli 2002 CanLII 41868(2002 ONCA). While the case is most often discussed in child‑support contexts, its principles apply equally to spousal support.
The Court of Appeal confirmed that income may be imputed where a party is unemployed or under‑employed, unless that status is justified by reasonable health needs. Importantly, the court held that:
There is no requirement of bad faith; and
The issue is whether the person is earning less than they are capable of earning, given their circumstances.
In other words, a court can impute income even where health problems are genuine — if the evidence does not establish an inability to earn income altogether.
What Courts Expect to See in Medical Evidence
Ontario courts consistently reject vague or conclusory medical notes. Instead, persuasive medical evidence should address several key areas.
Clear Identification of the Condition
The court needs a diagnosis or, at minimum, a medically supported description of the condition. General statements that a party is “unwell” or “off work” carry little weight.
Severity and Impact
Medical reports must explain how serious the condition is, not simply that it exists. Courts need to understand how the condition affects daily functioning.
Duration
The evidence should distinguish between:
temporary limitations;
partial but ongoing limitations; and
long‑term or indefinite incapacity.
This helps the court determine whether any reduction in income should be temporary or ongoing.
Functional Limitations (Often the Most Important Part)
Courts focus heavily on what a person can and cannot do in practical terms, such as:
sitting, standing, or lifting restrictions;
cognitive limitations, including focus or memory;
fatigue, stamina, or pain levels;
ability to manage stress or deadlines;
medication side effects; or
driving restrictions.
This functional analysis is often more persuasive than the diagnosis itself.
Connection to Employment Capacity
The medical evidence must connect the condition to real‑world work ability. Courts want to know whether the condition prevents the person from:
returning to their former job only;
working in any capacity; or
working only in accommodated, sedentary, or part‑time roles.
This distinction is critical. Someone may be unable to return to physically demanding labour but still be capable of administrative, supervisory, or reduced‑hours work.
Treatment, Prognosis, and Efforts to Improve Capacity
Courts also look closely at whether the person claiming inability to work has taken reasonable steps to improve their condition.
Judges frequently ask:
What treatment is being pursued?
Is there an expected recovery timeline?
Are restrictions likely to improve?
Has the person followed medical advice?
Ontario courts are often skeptical when a party relies on health issues while failing to pursue recommended treatment, further assessments, workplace accommodations, or alternative employment.
A Consistent Judicial Trend: Caution and Skepticism
Recent Ontario decisions reflect a consistent approach:
Diagnosis alone is not enough.
One‑line “off work” notes are given little or no weight.
Courts expect objective, detailed, and employment‑focused evidence.
Total findings of inability to work are relatively rare without strong medical support.
Where evidence shows partial capacity, income is often imputed at a reduced or notional level.
Courts do not require someone to work beyond their medical limits — but they do expect reasonable efforts to work within them.
Why This Matters
Claims of medical inability to work can have a significant impact on support obligations. Weak or poorly presented medical evidence can lead to:
income being imputed despite health issues;
adverse credibility findings; and
unexpected support orders.
Conversely, well‑prepared, detailed, and credible medical evidence can meaningfully influence the court’s assessment.
Final Thoughts
If health issues are affecting your ability to work, the focus should be on evidence, clarity, and realism. The question is not whether your condition is legitimate — but whether the evidence demonstrates how, and to what extent, it limits your ability to earn income.
At Lamothe Law, we regularly help clients understand what courts look for, identify gaps in medical evidence, and present claims in a way that aligns with Ontario law.
If you are dealing with support issues where health and employment capacity are in dispute, early legal advice can make a critical difference.
Legal Disclaimer: The information provided in this document is for informational purposes only and does not constitute legal advice. If you require legal guidance specific to your situation, please consult a qualified lawyer or legal professional.
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