Disability Tax Credit (DTC) in 2026: Medical Criteria and CRA Interpretation

For many families, the Disability Tax Credit (DTC) is not simply a tax line item.

It can unlock:

• Immediate tax relief
• Retroactive refunds
• Access to the Registered Disability Savings Plan (RDSP)
• Eligibility for other federal and provincial programs

Yet DTC applications are frequently denied — not because the condition is not serious, but because the statutory test is misunderstood.

The DTC is governed by Income Tax Act (ITA) s.118.3, and eligibility is certified using CRA Form T2201 – Disability Tax Credit Certificate.

The test is legal.

The form is medical.

Both must align.

Let’s examine this carefully.

 

What Is the Disability Tax Credit?

The DTC is a non-refundable tax credit available to individuals who meet the statutory definition of being:

“Markedly restricted” in one or more basic activities of daily living.

It reduces federal tax payable.

If the individual has little or no tax payable, the credit may be transferable to a supporting family member.

But eligibility is strict.

 

The Legal Test Under ITA s.118.3

Under ITA s.118.3, an individual qualifies if:

1. They have a severe and prolonged impairment in physical or mental functions;
2. The impairment lasts (or is expected to last) at least 12 consecutive months;
3. The impairment markedly restricts them in a basic activity of daily living; OR
4. The cumulative effect of significant restrictions is equivalent to a marked restriction.

Each element must be satisfied.

 

What Is a “Marked Restriction”?

A person is markedly restricted if:

They are unable, or take an inordinate amount of time, to perform a basic activity of daily living — all or substantially all of the time (generally interpreted as 90% or more).

This is not a diagnosis test.

It is a functional test.

CRA evaluates:

• How the impairment affects daily life
• Whether the limitation is severe
• Whether it is continuous

 

Basic Activities of Daily Living Include:

Under the Act and CRA interpretation:

• Walking
• Feeding oneself
• Dressing
• Speaking
• Hearing
• Eliminating (bowel or bladder functions)
• Mental functions necessary for everyday life

Mental functions include:

• Memory
• Problem-solving
• Goal-setting
• Judgment
• Adaptive functioning

The list is statutory.

Not all medical conditions qualify.

 

Prolonged Impairment Requirement

The impairment must:

• Last at least 12 consecutive months, OR
• Be expected to last at least 12 consecutive months

Temporary conditions do not qualify.

This is a forward-looking test if the condition is ongoing.

 

CRA Form T2201: The Critical Document

The DTC application requires:

• Completion of Part A by the individual or legal representative
• Certification of Part B by a qualified medical practitioner

The practitioner must describe:

• The impairment
• The functional limitations
• The duration
• The severity

CRA evaluates the form against statutory criteria.

Vague descriptions often result in denial.

 

Common Reasons for Denial

Applications are frequently denied because:

• The impairment is described medically but not functionally
• The 90% “all or substantially all of the time” threshold is not demonstrated
• The restriction is intermittent
• The impairment does not meet marked restriction or cumulative effect tests

This is not a sympathy-based assessment.

It is statutory.

 

The Cumulative Effect Rule

If a person has multiple significant restrictions that together create severe overall limitation, they may qualify under the cumulative effect provision.

This often applies in:

• Mental health cases
• Neurological disorders
• Complex chronic conditions

Proper articulation is essential.

 

Retroactive Claims

If approved, CRA may allow retroactive adjustments for up to 10 prior years (subject to limitations).

This can result in:

• Significant refunds
• Adjustment of prior-year tax returns

Families should review past eligibility where impairment existed but was not claimed.

 

Transfer to Supporting Person

If the individual has insufficient taxable income to use the credit:

The unused portion may be transferred to:

• A spouse or common-law partner
• A supporting relative

Proper documentation is required.

 

Access to the RDSP

DTC approval often unlocks eligibility for the:

• Registered Disability Savings Plan (RDSP)

This can provide:

• Government grants
• Government bonds
• Long-term tax-deferred growth

For families building generational wealth, this is a powerful planning tool.

 

Interaction With Family-Owned Enterprises

For family businesses:

• DTC approval may affect income-tested benefits
• May influence succession planning
• May affect caregiving arrangements
• May create eligibility for additional deductions or credits

Holistic planning is required.

 

Common Misunderstandings

“If I have a diagnosis, I qualify.”
Diagnosis alone is insufficient. Functional impact is decisive.

“If I work full-time, I cannot qualify.”
Employment does not automatically disqualify someone.

“My doctor filled it out, so it must be approved.”
CRA applies statutory interpretation beyond the form.

“It’s permanent.”
CRA may review eligibility periodically.

 

Strategic Considerations for 2026

Before filing:

• Ensure medical practitioner understands the statutory test
• Describe functional limitations clearly
• Confirm duration requirement
• Review cumulative effect eligibility
• Consider retroactive claims

Precision in language improves approval likelihood.

 

Final Thoughts

Under ITA s.118.3, the Disability Tax Credit is governed by strict statutory criteria.

CRA Form T2201 must align with legal requirements.

The DTC is not automatic.

It is a structured entitlement requiring evidence of marked and prolonged functional restriction.

For families managing disability within a broader wealth and business framework, disciplined tax planning can preserve both financial stability and long-term opportunity.

At Shajani CPA, we integrate personal tax, family care considerations, and strategic planning with clarity and statutory precision.

Because tax relief, when properly structured, protects dignity and legacy.

Tell us your ambitions, and we will guide you there.

This information is for discussion purposes only and should not be considered professional advice. There is no guarantee or warrant of information on this site and it should be noted that rules and laws change regularly. You should consult a professional before considering implementing or taking any action based on information on this site. Call our team for a consultation before taking any action. ©2026 Shajani CPA.

Shajani CPA is a CPA Calgary, Edmonton and Red Deer firm and provides Accountant, Bookkeeping, Tax Advice and Tax Planning service.