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Disability tax credit

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The disability tax credit is a non-refundable credit for individuals with a severe and prolonged impairment, certified by a medical practitioner. Its own value is modest and, being non-refundable, is often nil for the person it is meant to help — but approval is the gateway to several other programs, including the child disability benefit, the Canada workers benefit disability supplement, and the registered disability savings plan. That gateway function makes it the most consequential determination in this line. This tutorial covers the eligibility criteria, the certification process, transfers to a supporting person, retroactive approval, and what to do when an application is refused.

How to work through this tutorial

This follows an application from criteria to consequences: 1. Understand what the credit is and why approval matters far beyond its own value. 2. Learn the eligibility criteria — severe, prolonged, and the categories. 3. Understand certification: who certifies, on what form, and what CRA does with it. 4. Understand that the credit is non-refundable, and what follows for a low-income applicant. 5. Learn the transfer to a supporting person. 6. Handle retroactive approval, which is where the largest amounts arise. 7. Handle a refusal — what the options are. 8. Know what approval unlocks. 9. Check your work against the common errors. 10. Verify every specific against CRA's published guidance before relying on it.

Why approval matters

As a credit, the disability amount reduces tax payable. It is indexed, it is non-refundable, and there is a supplement for a person under a specified age. If that were all, it would be a minor topic. It is not, because **approval gates other programs**: - **The child disability benefit**, paid monthly with the Canada child benefit for an eligible child. - **The Canada workers benefit disability supplement.** - **The registered disability savings plan**, which cannot be opened without approval and which attracts substantial government grants and bonds. - **The home accessibility tax credit** and certain medical expense claims, in defined circumstances. - Various provincial programs. So the question "is it worth applying if I pay no tax?" — which sounds sensible and is asked constantly — has a clear answer: yes, because the credit itself is only part of what approval delivers. The registered disability savings plan point deserves particular emphasis. The grants and bonds available can substantially exceed the value of the credit, they are income-tested rather than requiring contributions from wealthy families, and eligibility depends entirely on the certification. An agent who identifies an unapproved but plainly eligible person has found something worth far more than a line on a return.

The eligibility criteria

The impairment must be both **severe** and **prolonged**, and these are defined terms rather than ordinary usage. **Prolonged** means the impairment has lasted, or is expected to last, for a continuous period of at least a defined length. A serious but temporary condition does not qualify however disabling it is at the time. **Severe** is assessed against defined categories: walking, speaking, hearing, vision, feeding, dressing, eliminating (bowel or bladder functions), mental functions necessary for everyday life, and life-sustaining therapy. The test is generally that the individual is markedly restricted in one of these categories all or substantially all of the time, even with appropriate therapy, medication and devices. There is also a **cumulative effect** provision: someone significantly restricted in two or more categories, whose combined effect is equivalent to being markedly restricted in one, may qualify. This is frequently overlooked and is the route for many people with multiple moderate conditions. **Life-sustaining therapy** has its own criteria based on the time required for the therapy, and those criteria have been amended — confirm the current thresholds. Note what is not the test: a diagnosis. Eligibility turns on the **effect** of the impairment on the defined activities, not on the condition's name. Two people with the same diagnosis may reach different outcomes, and an applicant who lists their conditions without describing their functional effects has given CRA nothing to work with.

Certification and the decision

Eligibility is certified on a prescribed form by a medical practitioner. Which practitioners may certify depends on the category — a medical doctor or nurse practitioner may certify any, while an optometrist, audiologist, occupational therapist, physiotherapist, psychologist or speech-language pathologist may certify within their own scope. The practitioner completes the part describing the impairment and its effects; the applicant completes their own part. The form may be submitted digitally or on paper. CRA then decides. It may contact the practitioner for clarification, and it may ask the applicant for more information. A decision letter is issued stating whether the applicant is eligible, for which years, and whether the approval has an end date — approvals are sometimes granted for a limited period, after which recertification is needed. Two practical points. Practitioners may charge for completing the form, and that fee may itself be claimable as a medical expense. And the quality of the practitioner's description matters enormously: a form describing the diagnosis rather than the functional restriction is the most common reason a genuinely eligible person is refused. An applicant preparing to see their practitioner should be encouraged to think about how the impairment affects the specific listed activities, and for how much of the time.

Non-refundable, and the transfer

The credit is non-refundable, so it reduces tax payable and cannot go below zero. For many approved individuals — those with little or no income, which is a large proportion — the credit itself is worth nothing directly. The **transfer** provision addresses this. Where the individual cannot use all of the amount, the unused portion may be transferred to a supporting person: a spouse or common-law partner, or another supporting individual on whom the person depends for basic necessities. So the credit typically delivers its value through a parent, partner or adult child rather than the individual themselves. Explaining that up front prevents a disappointing conversation later. The individual must use what they can before transferring. The transfer is not optional in ordering: the unused remainder is what moves. Where a child is approved, the supplement for a person under the specified age applies as well, and it is reduced by certain child care and attendant care expenses claimed for the child — so claiming those expenses elsewhere can reduce the supplement, and the interaction is worth checking rather than assuming both can be maximised. Approval for a child also triggers the child disability benefit automatically once CRA has the certification, without a separate application.

Retroactive approval and refusals

Approval can be **retroactive**. Where the practitioner certifies that the impairment existed in earlier years, CRA may approve for those years — and the credit can then be claimed for them. This is where the largest amounts arise. Prior years require adjustment requests, subject to the ordinary reach-back window covered in the individual tax line. The consequences cascade: the child disability benefit may be payable retroactively, the Canada workers benefit disability supplement may be claimable for earlier years, and other programs may follow. Critically, **these do not all happen automatically.** The child disability benefit generally follows the approval, but credits claimed on returns for earlier years require the returns to be adjusted. An approved applicant who does nothing further may receive only part of what they are owed, and telling them to request adjustments for the approved years is concrete and valuable. On a **refusal**, the options are: ask CRA to review the decision, supplying further information from the practitioner; or file a formal objection, which has a deadline running from the notice. The most productive first step is usually additional practitioner information addressing the functional restrictions in the terms the criteria use — because the commonest cause of refusal is a form that described a condition rather than its effects. That is fixable, and it is worth saying so rather than sending someone straight to a formal dispute they may not need.

Common errors

Telling someone with no tax payable that applying is not worth it. Approval gates the child disability benefit, the workers benefit supplement and the registered disability savings plan. Treating the credit as diagnosis-based. Eligibility turns on the functional effect of the impairment, not the condition's name. Overlooking the cumulative effect provision for someone with several moderate restrictions. Quoting the life-sustaining therapy thresholds from memory. They have been amended. Assuming only a physician may certify. Several practitioner types may certify within their scope. Not warning an applicant that a form describing the diagnosis rather than the functional restriction is the commonest cause of refusal. Overlooking that an approval may have an end date requiring recertification. Not explaining the transfer to a supporting person, leaving a low-income applicant expecting a payment. Assuming the transfer is discretionary in ordering. The individual uses what they can first. Overlooking the interaction between the supplement for a child and child care or attendant care expenses claimed elsewhere. Assuming retroactive approval flows automatically into everything. Prior-year credits require adjustment requests. Sending a refused applicant straight to a formal objection when further practitioner information would resolve it. Forgetting that the practitioner's fee for completing the form may be claimable as a medical expense.

What to verify this tutorial against

This was drafted without a source document. The criteria and the life-sustaining therapy thresholds have both been amended and must be confirmed. CRA's disability tax credit pages set out the eligibility criteria, the categories, the cumulative effect provision, the certification process and who may certify. The disability tax credit certificate carries its own instructions and shows what the practitioner is asked to describe. CRA's disability tax credit guide covers the credit, the supplement for a person under the specified age, the transfer to a supporting person, and the interaction with child care and attendant care expenses. CRA's registered disability savings plan pages cover the grants and bonds that approval unlocks — often the largest consequence of approval. CRA's child disability benefit pages cover the supplement paid with the Canada child benefit. CRA's guidance on requesting a change to a return covers claiming the credit for retroactively approved years and how far back that reaches. CRA's objections guidance covers the formal dispute route following a refusal.

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