Am I Eligible for an RDSP? The Disability Tax Credit Explained

Every Registered Disability Savings Plan starts at the same gate: Disability Tax Credit approval. What Is an RDSP? covers the account itself — the government grants and bonds, contribution limits, withdrawal rules. This guide goes deep on the one piece that has to happen before any of that: the DTC application itself.

What "severe and prolonged impairment" actually means

Disability Tax Credit (DTC) eligibility isn't based on a diagnosis — it's based on how much a condition restricts daily functioning, assessed against specific categories CRA calls basic activities of daily living:

• Walking
• Speaking
• Hearing
• Elimination (bowel or bladder function)
• Feeding
• Dressing
• Performing the mental functions necessary for everyday life
• Life-sustaining therapy to support a vital function
• The cumulative effect of significant restrictions in two or more of the above, where no single one alone reaches the threshold

To qualify, someone needs to be markedly restricted in at least one category — meaning unable to perform it, or taking an inordinate amount of time to perform it, all or substantially all of the time (CRA generally applies a 90%-of-the-time standard), even with appropriate therapy, devices, or medication. A commonly used practical benchmark is needing roughly three times longer than someone of the same age without the impairment to complete the activity.

Two concrete examples, without diagnosing any specific condition:

• Someone who cannot reliably remember simple instructions, keep track of appointments, or follow a short conversation without significant difficulty may be markedly restricted in mental functions.
• Someone who needs close to three times as long as an unimpaired peer to get dressed every single day, every day, not just occasionally, may be markedly restricted in dressing.

Life-sustaining therapy, specifically

This category works differently from the others. It's based on time spent on therapy, not on how restricted the activity itself is. To qualify, the therapy needs to be:

• Needed to support a vital function
• Administered at least three times a week
• Taking a total of at least 14 hours a week, on average

Dialysis for kidney failure and intensive insulin therapy for diabetes are common qualifying examples. Time spent actually determining and administering the correct dose counts toward the 14 hours. Time a device like an insulin pump or pacemaker takes to passively deliver therapy generally doesn't count on its own, though time spent setting the device up does.

Filling out Form T2201, step by step

The Disability Tax Credit Certificate — Form T2201 — has two parts, filled out by two different people:

1. Part A — completed by the applicant (or someone applying on their behalf). Basic identifying information, and consent for CRA to contact the certifying practitioner directly if needed.
2. Part B — completed and certified by a qualified medical practitioner, describing the impairment against CRA's specific categories.

Not every practitioner can certify every category. A medical doctor or nurse practitioner can certify any type of impairment. Several other practitioners can certify too, but only within their own scope of practice:

The application can be submitted on paper or through CRA My Account, where a digital version of the form flags obviously missing information before it's submitted — one real, practical way to avoid the most common cause of delay.

Realistic processing timelines

CRA's stated service standard is 8 weeks from receiving a complete T2201 to a decision, called a Notice of Determination. That clock only starts once the application is actually complete — a form missing information gets kicked back for more detail first, which resets the practical timeline, not just delays it slightly.

CRA has also been actively changing how DTC applications move through the system. As of mid-2026, the agency has been pushing applicants toward the online process specifically because it processes faster and catches missing information upfront, and has restricted using the "submit documents" feature in CRA My Account for DTC applications except when CRA specifically requests something — worth knowing if a paper-mail habit is the default, since it may no longer be the fastest path.

A real-world walkthrough

Raj, 34, has managed Type 1 diabetes since his teens with multiple daily insulin injections and constant blood glucose monitoring. He assumed for years that the diagnosis itself would qualify him for the DTC, and never applied — a common, costly assumption.

When Raj finally looked into it, he learned the DTC isn't granted for having diabetes; it's granted based on how much time his actual therapy takes each week. He asked his endocrinologist to complete Part B, and specifically to document the real time spent determining insulin doses and managing his regimen — not just the diagnosis. His therapy comfortably cleared the 14-hours-a-week threshold once dose calculation and monitoring were accounted for accurately.

Raj applied online through CRA My Account. Seven weeks later, he received a Notice of Determination approving him for the DTC — and, because approval can apply retroactively, for several prior tax years as well, using Form T1-ADJ to adjust those past returns. He then opened an RDSP and learned that the retroactive DTC years also unlocked retroactive CDSG matching room for the same period, once he made a contribution — money he'd had no idea existed until he actually looked into eligibility instead of assuming a diagnosis wasn't enough on its own.

If your application is denied

A denial is a real setback, not a dead end. Two different paths forward, depending on the situation:

• Request a second review (a "redetermination"). The right move when there's new or more complete medical information to add — a more detailed letter from a practitioner familiar with the day-to-day impact, for example. There's no strict deadline, but starting within a year of the Notice of Determination is a reasonable target.
• File a formal Notice of Objection. The right move when there's no new medical information, but a genuine belief CRA made an error applying its own criteria to what was submitted. This has a real deadline: 90 days from the date on the Notice of Determination.

Either way, the practitioner filling out Part B matters enormously. A form that documents diagnosis without documenting the actual day-to-day, week-to-week functional impact is one of the most common, avoidable reasons an application that should qualify gets denied on the first attempt.

Retroactive approval, and what it unlocks

DTC approval isn't limited to going forward. Using Form T1-ADJ, approval can generally be applied retroactively for up to 10 years of past tax returns — each year adjusted individually, with a copy of the approved T2201.

The RDSP payoff compounds from there. Once retroactive DTC years are confirmed, opening or contributing to an RDSP can unlock retroactive CDSG and CDSB room for those same years — potentially a meaningful amount of government matching money that would otherwise simply never be claimed, governed by the matching rates and thresholds that applied in each specific year. The mechanics of that matching are covered in full in What Is an RDSP?; the point here is simply that a DTC approval arriving "late" doesn't mean those earlier years are lost by default.

Common mistakes

• Assuming a diagnosis alone is enough. CRA assesses functional restriction, not diagnosis — the same condition can qualify one person and not another, depending on real-world severity.
• Letting Part B understate the actual impact. A practitioner who documents the diagnosis without documenting time, frequency, and severity against CRA's specific categories makes approval harder than it needs to be.
• Giving up after one denial. A second review with better medical detail, or a formal objection when CRA's own reasoning looks wrong, both remain real options.
• Not applying at all "because it seems complicated." The digital application through CRA My Account flags missing information before submission specifically to reduce this friction.
• Forgetting the retroactive step after approval. Getting approved going forward is only half of it — checking whether Form T1-ADJ can recover past years, and whether that unlocks retroactive RDSP grant and bond room, is a separate step that doesn't happen automatically.

Sources

• Disability tax credit (DTC) — Canada Revenue Agency
• Life-sustaining therapy eligibility — Canada Revenue Agency
• CRA's decision on your DTC application — Canada Revenue Agency
• Help speed up your disability tax credit application — Canada Revenue Agency
• File an objection — Canada Revenue Agency

This article is general financial education, not personalized financial, legal, or tax advice. DTC eligibility is assessed individually against a specific medical and functional situation — confirm your own circumstances with the CRA, a qualified medical practitioner, or a tax professional before applying, appealing, or making RDSP decisions based on the outcome.

What to do next

DTC approval is the single requirement everything else about an RDSP depends on — worth confirming or pursuing before anything else. What Is an RDSP? covers what happens next: opening the account, how CDSG and CDSB matching actually works, and the rules worth knowing before contributing. This is the second guide in an ongoing series on RDSPs in more depth — more will link back here as they publish.