Quick Answer
Yes, major depressive disorder can qualify for the Disability Tax Credit Canada in 2026 under the mental functions category. Approval depends on documented marked restriction in adaptive functioning, problem-solving, or goal-setting present at least 90% of the time. Treatment-resistant depression has stronger approval odds than well-managed depression.
CRA Category for Depression
Depression claims fall under mental functions necessary for everyday life. This category covers impairments in memory, problem-solving, adaptive functioning, goal-setting, and judgment. For depression to qualify, it must markedly restrict one or more of these functions at least 90% of the time.
Who Qualifies, and Who Doesn't
The DTC is not designed for mild or moderate depression. It targets severe cases where daily functioning is fundamentally impaired. Categories that often qualify:
- Treatment-resistant depression (TRD), failed multiple antidepressants and/or ECT/TMS; ongoing severe impairment
- Recurrent major depression with frequent episodes, if episodes collectively cover 90%+ of the year
- Psychotic depression, severe functional impairment across cognitive and daily living domains
- Persistent depressive disorder (dysthymia) with severe and continuous functional restriction
Who typically does not qualify: depression that responds to first-line treatment, depressive episodes separated by periods of good functioning, or mild-to-moderate symptoms.
Key Documentation for Depression DTC Claims
- Complete psychiatric history showing treatment course (medications tried, results, hospitalizations)
- Specific description of how depression affects daily activities, can the person cook, clean, manage money, leave home
- Employment records showing inability to work due to depression
- GAF (Global Assessment of Functioning) scores if available from treating psychiatrist
- Records of hospitalization, crisis interventions, or suicide attempts
- Details about medication side effects affecting daily function
- Frequency and duration of depressive episodes over the past 3 years
The Medication Problem
As with other mental health conditions, CRA considers functioning "with appropriate therapy," including antidepressants. If medication successfully manages depression to a non-restricting level, the DTC may not apply.
However, the claim may still qualify if depression remains severely impairing despite multiple medication trials. It may also qualify if medication has significant side effects that themselves cause impairment.
The treating psychiatrist should explicitly address: (1) what therapies have been tried, (2) what the response has been, and (3) what the person's functional status is even with current treatment.
2026 DTC Amounts for Depression
If approved: federal credit $1,448/year. Combined federal + provincial: $2,047 (Ontario) to $3,708 (Québec). Retroactive credits can be significant, but the final amount depends on the CRA-approved years, province, taxable income, transfer rules, and prior returns.
Real depression Filing Scenario
The following example is illustrative. It describes a typical filing flow and does not predict any individual outcome.
An Edmonton resident with treatment-resistant major depressive disorder met with her psychiatrist for Part B certification. The psychiatrist documented mental-functions restrictions: lack of motivation requiring constant prompting for routine self-care, cognitive slowing affecting decision-making, and four failed medication trials over six years.
Part B addressed the 90-percent threshold by describing daily functioning during both treatment-active periods and inter-episode periods. It cited residual restrictions even when medication was at its most effective. The Notice of Determination arrived 12 weeks after submission, approving the DTC retroactive to 2021.
Documentation That Works for depression Part B
What worked in this Part B: documenting residual restriction during periods of best treatment response. CRA reviewers consistently deny depression claims that describe only severe episodes.
What passes is evidence of restriction present at least 90 percent of the time, including when treatment is working as well as it can. See our cumulative effects rule guide for the technical framework CRA reviewers apply, and our DTC denied appeal guide if a previous application was rejected.
What to Ask Your Practitioner to Document
For a depression DTC application, the most useful medical wording explains how symptoms affect everyday decisions and routines, not only how the person feels.
Ask the certifying practitioner to describe whether the person can start and complete hygiene, meals, medication routines, appointments, budgeting, transportation, and safety-related decisions without repeated prompting. If family members provide daily support, the file should explain what support is needed and what happens when it is removed.
CRA also looks closely at duration. A strong depression file should identify when the marked restriction began, whether the pattern has lasted or is expected to last at least 12 months, and whether the restriction is present all or substantially all of the time. If depression is episodic, the practitioner should explain the baseline impairment between episodes and avoid relying only on worst-day examples.
It can also help to separate medical symptoms from tax eligibility. Low mood, sleep disruption, or loss of interest may explain the diagnosis, but CRA still needs the daily-function bridge: what tasks are not completed, what decisions are unsafe, and what support is required repeatedly. Specific examples make the review easier overall.
For an estimate after the eligibility question is understood, compare the approved years with the 2026 DTC rates guide and the province rates hub. Those pages help with planning, but they do not replace CRA's determination.
Frequently Asked Questions
No. Depression must be severe enough to markedly restrict daily functioning 90%+ of the time. Most people with depression, even those who suffer significantly, do not meet this threshold. Treatment-resistant, recurrent, or psychotic depression is most likely to qualify.
CRA's standard is functional impairment, not diagnostic severity. A clinical description of "severe depression" in a diagnosis does not automatically translate to a DTC approval. the T2201 must describe specific functional limitations in daily activities that meet the "markedly restricts" threshold.
Yes, for years in which your depression caused marked functional restrictions. Your psychiatrist or physician must certify the start date and confirm the condition existed at that severity in prior years, based on your medical records.
A psychiatrist can provide detailed specialist context for mental health DTC claims. If your family doctor has thoroughly documented your depression over many years, they can also certify, but for complex or treatment-resistant cases, a psychiatrist's assessment is preferred by CRA.
Official Sources and Related Guides
This condition guide is based on CRA's Disability Tax Credit criteria and official Form T2201 instructions. Use it with our DTC eligibility guide, T2201 form guide, and DTC calculator. For questions about your own facts, contact Disability Tax Credits Canada or speak with a qualified Canadian tax professional.