Disability Tax Credit: Questions to Ask Before Applying

The Disability Tax Credit can be confusing because people often hear about it alongside several different benefits. A useful first step is to separate the application for DTC eligibility from claiming a tax amount and from applying for another programme. They are connected in some circumstances, but they are not the same decision.

This guide explains questions to prepare for a conversation with a medical practitioner or tax adviser. It does not decide eligibility or calculate an individual’s tax result. The CRA sources linked below were checked on 22 October 2026; use the current official instructions when applying.

What does the credit actually do?

CRA’s DTC overview describes a non-refundable credit that can reduce income tax payable by an eligible person or, where the rules allow, a supporting family member. An unused portion is not simply paid out as a cash refund. Ask how the credit would apply to the actual tax situation rather than interpreting a published disability amount as a guaranteed cheque.

DTC eligibility may also be relevant to other programmes, including the RDSP and certain benefits, but those programmes have their own conditions. Ask which separate applications or checks are required. Approval for a different disability programme does not establish DTC eligibility.

Before making a financial plan, identify what you are trying to understand: current-year tax, a possible transfer, previous years or access to another programme. A focused question is easier to answer accurately than “How much will we get?” without the relevant circumstances.

Does an autism diagnosis automatically qualify someone?

No automatic conclusion follows from the diagnosis alone. CRA’s mental-functions eligibility page explains that eligibility concerns the effects of an impairment rather than the diagnosis itself. Ask the practitioner how the person’s actual functioning relates to the applicable criteria.

The official eligibility overview describes a marked restriction as being unable to perform an activity, or taking three times as long as a similar-aged person without the impairment, even with appropriate therapy, medication and devices. It also sets frequency and duration requirements: generally at least 90% of the time and a continuous period of at least 12 months, actual or expected.

There are separate provisions for the cumulative effect of significant limitations in multiple categories and for life-sustaining therapy. Do not combine unrelated difficulties informally and assume the criteria are met. Review the relevant official category with the practitioner, including how the full requirements apply together.

Who can complete the medical portion?

CRA’s application instructions identify which practitioners can certify each category. Medical doctors and nurse practitioners can certify all categories; psychologists can certify mental functions. Other listed professions have specified categories, so check the table before arranging an appointment.

Ask whether the practitioner has enough relevant information and what they need to assess the effects accurately. They may need history, observations or clarification. Bringing organised examples can support the conversation, but the applicant does not complete or dictate the practitioner’s certification.

Clarify any fee for completing the application, what the appointment includes and how long the office expects the work to take. A completion fee does not buy a favourable conclusion or guarantee CRA approval. If you need communication adjustments for the discussion, arrange them in advance.

What information should we prepare?

Prepare a concise account of the relevant everyday activity: what happens, how often, how long the limitation has existed and what assistance or devices are already used. Include variation and helpful support. Do not remove assistance to create a more dramatic example or describe an exceptional day as the usual pattern.

For a child, ask how the comparison with a similar-aged child applies. For an adult, ensure their own account is included, using their preferred communication method. A family member may add observations with appropriate involvement, but should not automatically speak over the person.

Which application route is current?

Choose one method and coordinate it with the practitioner’s office. CRA currently requires Part A and Part B to use the same format. In the digital process, the applicant completes Part A and gives the reference number to the appropriate practitioner, who completes Part B. The applicant must not complete Part B themselves.

The CRA’s June 2026 application update explains two changes: from 14 July 2026, new DTC applications cannot be sent through the CRA account’s general “Submit documents” function; from 8 September 2026, pre-2023 paper forms are no longer accepted. Use the current digital application or download the latest paper form and follow the mailing instructions.

If CRA requests additional information for an existing case, follow that letter’s instructions and case reference. That is a different situation from submitting a new application. Avoid relying on a saved checklist, old video or third-party article that predates these changes.

What should we keep and check afterwards?

Keep a record of the chosen method, relevant reference information, copies available to you and the date the complete application was submitted. Store sensitive information securely. Ask the practitioner’s office how completion will be confirmed, especially if you have finished your part but do not know whether theirs has been sent.

Use CRA’s current processing information rather than a promised turnaround from an unrelated source. Read correspondence carefully and note any requested action or deadline. If something is unclear, use the official CRA contact route or appropriate professional help.

After a decision, check the approved period and the next steps described by CRA. Do not assume eligibility lasts indefinitely or that every connected programme has been automatically arranged. If considering an adjustment to a previous return or a transfer to a family member, obtain advice for the actual circumstances before estimating the result.

Common questions