Few areas of personal tax produce as much frustration as the disability tax credit (DTC). Taxpayers often arrive with a thick file of genuine, well-documented medical conditions, a supportive physician, and a deep sense of unfairness that the Canada Revenue Agency (CRA) said no. Laing v. The Queen, 2019 TCC 267, is a useful decision precisely because it is not a dramatic story. It is an ordinary, sympathetic case in which the appellant had real and serious health challenges — and still did not qualify. Understanding why is the key to understanding what the DTC actually measures.
The decision matters to taxpayers because it illustrates a hard truth that catches many self-represented appellants off guard: the DTC is not a credit for being seriously ill, or for having several conditions at once. It is a narrowly defined credit that turns on the effect of an impairment on specific, listed basic activities of daily living, measured against a demanding statutory threshold. Laing shows how the Tax Court works through that analysis — including the often-misunderstood rule about adding up the cumulative effect of multiple restrictions.
The facts
The appellant, Ms. Laing, claimed the disability tax credit for several taxation years. The CRA denied the claim, and she appealed to the Tax Court of Canada under the Court's informal procedure. By the time of the hearing she was representing herself, having parted ways with a firm that had originally been handling the matter on her behalf.
The medical picture was not in dispute and was not trivial. Ms. Laing lived with documented health conditions including bipolar disorder and irritable bowel syndrome, along with related challenges that affected her daily life. The evidence painted a genuine and sympathetic portrait of someone managing ongoing illness. The case did not founder because the Court doubted she was unwell. It turned on a much narrower legal question.
The issue
Eligibility for the DTC is governed by sections 118.3 and 118.4 of the Income Tax Act. To qualify on the basis of a physical or mental impairment, a taxpayer generally must show that the impairment is severe and prolonged, and that its effects cause the individual to be markedly restricted in the ability to perform a basic activity of daily living. The statute defines the basic activities narrowly. They include:
- mental functions necessary for everyday life;
- feeding and dressing oneself;
- speaking and hearing;
- eliminating (bowel and bladder functions); and
- walking.
A person is markedly restricted only if, all or substantially all of the time, they are unable (or require an inordinate amount of time) to perform one of those activities, even with appropriate therapy, medication and devices. The word "inordinate" does a lot of work: the courts have read it to require a marked departure from normal ability, not merely ordinary difficulty.
The Income Tax Act also contains a cumulative-effect rule. Where an individual is significantly restricted in two or more basic activities — restricted enough that the combined effect is equivalent to being markedly restricted in a single activity — the person can qualify even though no one activity, on its own, crosses the marked-restriction line. The central issue in Laing was whether Ms. Laing's various conditions, taken together, met that cumulative threshold. In other words: did her real and documented restrictions, added up, equal a marked restriction in one basic activity of daily living?
It helps to understand why Parliament drew the line this way. The DTC is a non-refundable credit intended to recognize the non-discretionary, unavoidable costs that flow from a severe and prolonged impairment — costs that reduce a taxpayer's ability to pay tax compared to someone of similar income without the impairment. To keep the credit targeted, the statute does not ask whether a person is sick, in pain, or facing hardship in the ordinary sense. It asks a tightly defined factual question about a fixed list of activities. That design choice is what makes DTC appeals turn so heavily on careful, activity-specific evidence rather than on the overall sympathy of the situation, and it is the reason a taxpayer can be genuinely unwell and still fall outside the credit.
What the Court decided (and why)
The Court dismissed the appeal. Despite genuine sympathy for the appellant's circumstances, the judge concluded that the evidence did not establish that Ms. Laing was markedly restricted in any single basic activity, nor that the cumulative effect of her significant restrictions reached the equivalent of a marked restriction.
The reasons worked carefully through the statutory scheme and the established case law on what "markedly restricted" and "inordinate amount of time" mean. A few threads from that analysis are worth drawing out, because they recur in almost every DTC appeal:
- The credit measures effect, not diagnosis. A serious diagnosis — even several of them — is the starting point, not the finish line. The question is always how the impairment restricts a listed basic activity, all or substantially all of the time.
- "Significant" is not the same as "marked." The cumulative-effect rule only helps where the individual restrictions are themselves significant and, combined, are equivalent to a marked restriction. Multiple ordinary difficulties do not aggregate into eligibility. The Court must be able to find significant restrictions in two or more basic activities before it can add them together.
- The threshold is demanding by design. "Inordinate amount of time" requires a marked departure from the normal time an activity takes. General fatigue, discomfort, or the practical burden of managing chronic illness — however real — does not automatically satisfy that test.
- Evidence has to connect condition to activity. The Court needs evidence that ties the medical condition to a specific, measurable restriction in a basic activity. A general account of poor health, without that bridge, leaves the judge unable to make the finding the statute requires.
On the record before it, the Court could not find that Ms. Laing's conditions produced a marked restriction in any one activity, nor the cumulative equivalent. The appeal was therefore dismissed. The full decision is available on CanLII at Laing v. The Queen, 2019 TCC 267.
Why this decision matters / practical takeaways
Laing is not a landmark in the sense of changing the law. Its value is as a clear, recent illustration of how the DTC analysis plays out for a sympathetic, self-represented taxpayer — and where these appeals most often come undone. For anyone considering a DTC claim or appeal, several practical lessons follow:
- Frame the claim around basic activities, not conditions. The strongest claims identify a specific listed activity — walking, feeding, dressing, mental functions, elimination — and build evidence that the person is unable, or takes an inordinate amount of time, to perform it all or substantially all of the time.
- Understand the cumulative-effect rule before relying on it. It is a real and valuable provision, but it requires significant restrictions in two or more activities that together equal a marked restriction. It is not a way to add up unrelated minor difficulties.
- The medical certificate is not self-proving. The Form T2201 and the physician's view carry weight, but at the Tax Court the taxpayer bears the burden of demonstrating eligibility on the evidence. Detailed, activity-specific testimony and medical support matter.
- Self-representation raises the degree of difficulty. The informal procedure is designed to be accessible, and many taxpayers do appear on their own. But DTC appeals turn on fine statutory distinctions — "significant" versus "marked," "difficulty" versus "inordinate" — that are easy to miss without help.
The same discipline applies across the wider family of personal credits. The medical expense tax credit turns on whether a particular expense falls within the list of eligible medical expenses and meets conditions such as being prescribed or certified where the rules require it; the moving expense deduction under section 62 turns on whether the move was an eligible relocation that brought the taxpayer at least 40 kilometres closer to a new work or study location, and on whether the specific costs claimed are the kind the statute allows. In each case the legal test is granular, and the taxpayer who pairs the claim with organized receipts, dates, distances and supporting documents is in a far stronger position than one who relies on the general reasonableness of the expense. Laing is a DTC case, but its core lesson — match the facts to the precise statutory conditions — is the through-line of every personal-credit dispute.
If your DTC denial originated in an audit or a broader dispute with the CRA, the same evidentiary discipline that governs DTC appeals carries through the rest of the process. Our overviews of the audit representation process and the rules on evidence and burden of proof in the Tax Court explain how the Court weighs the record, and our guide to the Tax Court of Canada appeal process walks through the procedural steps.
How Barrett Tax Law approaches disability and medical credit files
Barrett Tax Law approaches personal-credit disputes — disability tax credit, medical expense, and moving expense files — as evidence-building exercises from the very first step. Our typical process is to review the CRA's stated reasons for denial, map the claim against the specific statutory tests in sections 118.3 and 118.4, and then work backwards to identify the evidence that will actually move a judge: activity-specific medical detail, the right physician input, and testimony that connects each condition to a defined basic activity of daily living. Where the cumulative-effect rule is in play, we focus on documenting significant restrictions in more than one activity rather than relying on a general picture of ill health.
For taxpayers whose DTC denial is bound up with a larger CRA matter, that work often runs alongside our audit representation and, where a dispute proceeds, our representation at the Tax Court of Canada. If you have received a notice denying a disability tax credit or a medical-expense claim and want to understand your options, we offer a free initial consultation to review where your file stands and what an appeal would realistically require.
This article is commentary on a public court decision. It is general information only, not legal advice, and the outcome of any tax matter depends on its specific facts. For advice about your situation, speak with a lawyer.
Frequently asked questions
What does it mean to be 'markedly restricted' for the disability tax credit?
Under sections 118.3 and 118.4 of the Income Tax Act, a person is markedly restricted only if, all or substantially all of the time, they are unable to perform a basic activity of daily living — or require an inordinate amount of time to do so — even with appropriate therapy, medication and devices. The listed activities are narrow: walking, feeding and dressing oneself, speaking, hearing, elimination, and the mental functions necessary for everyday life. The threshold is demanding, and ordinary difficulty is not enough.
Can several medical conditions be combined to qualify for the DTC?
Sometimes. The Income Tax Act has a cumulative-effect rule: where a person is significantly restricted in two or more basic activities, and the combined effect is equivalent to being markedly restricted in a single activity, they may qualify even though no one activity crosses the line on its own. But as Laing v. The Queen, 2019 TCC 267 shows, this only works where each restriction is genuinely significant and the combination truly equals a marked restriction. Several minor or unrelated difficulties do not add up to eligibility.
Why was the appeal dismissed in Laing v. The Queen even though the taxpayer was genuinely ill?
The Tax Court accepted that the appellant had real, documented health conditions, but the DTC measures the effect of an impairment on specific listed activities — not the seriousness of a diagnosis. The Court was not persuaded that any single basic activity was markedly restricted, or that the cumulative effect of her significant restrictions reached the marked-restriction equivalent. Without evidence tying her conditions to a defined activity at the required threshold, the statutory test was not met and the appeal was dismissed.
If a doctor signs Form T2201, is the credit automatic?
No. A completed Form T2201 (Disability Tax Credit Certificate) and a supportive physician are important, but they are not conclusive. The CRA can deny the claim, and on appeal to the Tax Court the taxpayer bears the burden of proving eligibility on the evidence. Detailed, activity-specific medical evidence and testimony are usually what make the difference, not the certificate alone.
What is the deadline to appeal a denied disability tax credit to the Tax Court?
Generally, after the CRA confirms its denial, you have 90 days to file a notice of appeal with the Tax Court of Canada. Most DTC appeals proceed under the informal procedure, which is designed to be more accessible. Because the deadlines and the statutory tests are strict, it is wise to get advice early rather than after a deadline has passed.
Do the same evidence rules apply to medical expense and moving expense disputes?
The specific statutory tests differ — the medical expense tax credit and the moving expense deduction each have their own requirements — but the underlying discipline is the same. In every personal-credit dispute at the Tax Court, the taxpayer must connect the facts to the precise statutory conditions with credible, well-organized evidence. The Court decides on the record before it, so building that record carefully is the central task in any appeal.