Asthma can may have access to for the Disability Tax Credit, but only if it meets the CRA's definition of severe and prolonged

The Disability Tax Credit (DTC) is a federal tax benefit you can claim if you have a severe and prolonged impairment. Asthma qualifies, but not every person with asthma. The Canada Revenue Agency (CRA) looks at whether your asthma limits your ability to perform basic daily activities — not just whether you have the diagnosis.

Most people with asthma do not meet the DTC threshold. You need to show that your condition causes marked restrictions in everyday functioning, and that these restrictions are expected to last at least 12 months. A diagnosis alone is not enough. The CRA wants to see how asthma actually affects what you can do.

If your asthma does may have access to, you can claim the credit retroactively for up to 10 years, and you may also be may be able to access for the Registered Disability Savings Plan (RDSP), which offers government grants and bonds.

Key Takeaways

  • The CRA requires that asthma cause marked restrictions in daily activities like walking, breathing during exertion, or self-care — not just that you have asthma.
  • Your doctor must complete Form T2201, which asks specific questions about functional limitations, not just your diagnosis or medication list.
  • Asthma that is well-controlled with medication often does not meet the DTC standard, even if you use an inhaler regularly.
  • If approved, you can claim the credit back 10 years and may open an RDSP to receive government contributions of up to $90,000 over your lifetime.
  • The CRA denies most first-time DTC claims for asthma; if you are denied, you can request a reconsideration with additional medical evidence.

What the CRA means by "marked restriction"

The CRA does not use the word "severe" the way a doctor might. When they say your asthma must cause a marked restriction, they mean it must substantially limit your ability to perform a basic activity of daily living — things like walking, dressing, eating, or managing your personal hygiene. For asthma specifically, this usually means you cannot walk or breathe without significant difficulty, even with medication.

The key phrase in the DTC rules is "all or substantially all of the time." If your asthma flares up once a month or during certain seasons, that is not marked restriction. If you can walk for 15 minutes without stopping to catch your breath, that is usually not marked restriction. The CRA is looking for a limitation that affects you most days, most of the time.

Asthma that requires you to use a rescue inhaler before any physical activity, or that forces you to rest frequently during a normal day, may cross this threshold. But asthma that is managed with a daily controller inhaler and rarely causes symptoms usually does not.

how the process works: Form T2201 and what your doctor needs to write

You start by asking your doctor to complete Form T2201, the Disability Tax Credit Certificate. This is not a straightforward form. It asks your doctor to describe your functional limitations in detail — not to list your medications or test results, but to explain what you actually cannot do.

For asthma, your doctor should describe things like: how far you can walk before needing to stop, whether you can climb stairs, whether you need to rest after routine activities, how often you have breathing difficulties, and whether your symptoms occur even when you are taking your prescribed medication. The form also asks whether your condition is expected to last at least 12 months.

Many doctors are not familiar with the CRA's specific language and may write a letter that focuses on diagnosis rather than function. If your doctor writes "patient has moderate asthma" without describing what that means for your daily life, the CRA will likely deny the claim. You may need to ask your doctor to be specific about functional limitations, or to provide a detailed letter in addition to the form.

Why most asthma claims are denied

The CRA denies approximately 60 to 70 percent of first-time DTC claims for asthma. The most common reason is that the medical evidence does not show marked restriction. A person may have asthma, use medication daily, and still not meet the threshold because their symptoms are controlled.

The CRA also denies claims when the medical evidence is vague. Phrases like "patient experiences shortness of breath" or "asthma affects quality of life" do not tell the CRA whether you can walk to the mailbox or climb one flight of stairs. The form needs concrete descriptions of what you can and cannot do.

Another reason for denial is that the doctor does not confirm the condition is expected to last 12 months or longer. Even severe asthma may be denied if the medical evidence suggests it might improve or resolve.

What happens if you are denied

A denial is not final. You have the right to request a reconsideration, and you can submit additional medical evidence. Many people are approved on reconsideration because they provide more detailed functional information the second time.

When you request reconsideration, ask your doctor for a detailed letter that specifically addresses the CRA's concerns. If your first claim was denied because the evidence was vague, the new letter should include concrete examples: "Patient cannot walk more than 100 metres without stopping to rest due to shortness of breath" or "Patient requires 30 minutes of rest after climbing one flight of stairs."

You can also ask for a second medical opinion from a respirologist or pulmonologist, especially if your family doctor is not familiar with DTC claims. A specialist's assessment of your functional limitations carries more weight with the CRA.

The RDSP: What you can do if you are approved

If the CRA approves your DTC claim, you become DTC-may be able to access, which opens the door to the Registered Disability Savings Plan (RDSP). This is a savings account with significant government contributions.

The government will match your contributions through the Disability Savings Grant (up to $90,000 over your lifetime) and may also contribute through the Disability Savings Bond (up to $70,000 over your lifetime, regardless of whether you contribute). These are not loans — they are grants and bonds that belong to you.

You do not have to contribute your own money to receive the bond, though contribution room does affect how much bond you can receive. The money in the RDSP grows tax-free and does not count against your income for the purposes of other means-tested benefits like the may provide Income Supplement (GIS).

Asthma and other disability benefits

The DTC is a tax credit, not the same as Social Security Disability Insurance (SSDI) or provincial disability support programs. You can have asthma that qualifies for the DTC but does not may have access to for SSDI, or vice versa. Each program has its own definition of disability.

However, if you are already receiving SSDI or provincial disability support because of asthma, that does not automatically mean you may have access to for the DTC. You still need to meet the CRA's specific definition of marked restriction. Conversely, if you are approved for the DTC, you may want to explore whether you also meet the criteria for other disability programs.

Frequently Asked Questions

Does using an inhaler every day mean I may have access to for the DTC?

Not necessarily. The CRA looks at whether you have marked restrictions in daily activities, not at how often you use medication. Many people use a daily controller inhaler and have no significant functional limitations. You may have access to only if your asthma limits what you can do, even with medication.

Can I explore for the DTC myself, or do I need a doctor?

You need a doctor to complete Form T2201. The CRA will not accept an process without a medical certificate. Your doctor must be someone who has treated you and knows your condition — usually your family doctor or a respirologist.

How long does it take to get a decision on a DTC claim for asthma?

The CRA typically takes 4 to 8 weeks to process a DTC claim, though complex cases may take longer. If you are denied and request reconsideration, allow an additional 4 to 12 weeks. There is no way to expedite the process.

If I am denied, can I appeal to a court?

Yes. After reconsideration, if you are still denied, you can appeal to the Tax Court of Canada. You do not need a lawyer, though many people find it helpful to have one. Court appeals can take 1 to 2 years and involve submitting additional medical evidence and possibly testifying about your functional limitations.

What if my asthma gets worse after I am approved — do I need to reapply?

No. Once approved, your DTC may be able to access remains valid as long as your condition has not significantly improved. The CRA may ask you to recertify every few years, but you do not need to reapply from scratch unless your approval expires and you want to renew it.