If your professional tax preparer’s annual interview begins and ends with “Did anything change from last year?” you may not be getting the full value you are paying for. That question wrongly assumes you already know which life changes are relevant under Canadian tax law — and most taxpayers do not. A proper annual tax interview is a structured, proactive conversation that surfaces credits, deductions, and prior-year adjustments the client would never think to raise on their own. The Disability Tax Credit, the Medical Expense Tax Credit, and the Home Accessibility Tax Credit are three of the most commonly missed — not because taxpayers are careless, but because no one asked the right questions. This post explains what a complete annual tax interview looks like, why the gap matters, and what every Canadian taxpayer should expect from a professional tax preparer.
What This Means for Canadian Taxpayers in Professional Services
Lawyers, accountants, dentists, and other professionals who refer their personal tax work to a preparer often assume that a credentialled professional will surface every available credit automatically. That assumption is not always warranted. A busy tax preparer working through a high volume of returns during filing season may rely heavily on what the client volunteers. The client, not knowing what is taxable, deductible, or certifiable, answers the question asked — “Did anything change?” — honestly and incompletely. The result is a return that is accurate but incomplete. Accuracy and completeness are not the same thing.
The credits most commonly left on the table for individuals with disabilities, mobility limitations, or significant medical expenses — the Disability Tax Credit (DTC), the Medical Expense Tax Credit (METC), and the Home Accessibility Tax Credit (HATC) — require the preparer to ask specific, structured questions. None of them surface automatically from a pile of T-slips.
The Real Problem with “Did Anything Change From Last Year?”
The question is not malicious. It is a time management habit that has calcified into a standard opening. The problem is structural: it places the burden of tax knowledge on the client.
Consider what a taxpayer is actually being asked to do when they hear that question. They are being asked to self-identify which changes in their personal, medical, financial, or household situation qualify as taxable events or credit-triggering circumstances under the Income Tax Act. Most taxpayers cannot do that. They are not tax professionals. They hired one.
The consequences are real. Here is a personal example — shared here with identifying details removed, for educational purposes only, and not as individualized tax advice.
Two aunts lived together in Ontario. The elder cared for the younger, who had significant physical and mobility limitations. Over several years, the household incurred meaningful costs: medical appointments, mobility aids, and eventually a stairlift to make the home accessible. Neither aunt raised these expenses with their tax preparer in any structured way. The preparer never asked about disability certification, caregiver credits, or accessibility modifications to the home. The question, year after year, was some version of: “Anything new?” And each year, the aunts answered: “Not really.”
After the elder aunt obtained Disability Tax Credit certification — with an eligibility date beginning in 2023 — a review of prior filings and an adjustment process was undertaken. Approximately $1,800 was recovered. That recovery represented only the period covered by the certification and the adjustment window available at the time. It is worth noting that as of 2026, the general refund-adjustment window for T1 returns reaches back to 2016 — not 2015. For taxpayers who have been incurring qualifying expenses for many years, understanding the applicable adjustment window is important when assessing what may still be recoverable.
The stairlift and related accessibility modifications were also potentially relevant to both the Medical Expense Tax Credit and the Home Accessibility Tax Credit. For expenses incurred from 2016 through 2025, a qualifying accessibility expense could potentially be claimed under both credits simultaneously — provided every eligibility requirement under each credit was independently met. This is not a guarantee of eligibility, and the specific facts of any expense determine whether it qualifies under one credit, both, or neither. In 2026, proposed legislative changes may restrict the ability to claim the same expense under both credits going forward. Those proposed restrictions should not be applied retroactively to prior years.
None of this was explored. Not because the information was hidden — it is all in CRA guidance — but because no one in that annual appointment asked the right questions.
What Strategic Reallocation Looks Like in Practice
The following is a representative scenario, not a documented client case study. Details are illustrative of how a properly structured annual tax interview changes outcomes. Individual results depend entirely on specific facts and eligibility.
Consider a typical professional services firm in Ontario — a small accounting practice or law office — where the partners each handle their personal tax returns through a preparer. In a representative engagement, a preparer who conducts a structured annual interview might discover that a partner’s spouse received a DTC-eligible diagnosis two years prior, that the household installed an accessible bathroom modification in the prior tax year, and that a dependent parent living in the home has been incurring significant prescription costs. None of these facts were volunteered. All of them surface when the preparer asks directly: “Has anyone in your immediate household been diagnosed with a condition affecting daily living? Has any member of your household had a DTC application filed or considered? Have you made any modifications to your home in the past year?”
The goal of a structured annual interview is not to generate complexity. It is to make sure the taxpayer receives the full benefit of credits the government has already made available to them. That is the value a professional tax preparer is being paid to deliver.
For Canadian businesses thinking about how administrative and knowledge management systems can support their professional services teams, the TAS services overview covers how custom operational infrastructure — including knowledge capture systems — can help firms standardize and retain structured processes like this one across their practice.
How to Know If Your Tax Preparer Is Conducting a Complete Annual Interview
You do not need to be a tax expert to evaluate whether your preparer is doing a thorough job. You need to know what questions a thorough preparer would ask — and whether you are being asked them.
A complete annual tax interview for an individual Canadian taxpayer should cover, at minimum:
- Disability and health changes: Has any member of your household been diagnosed with a condition that limits daily activities? Has a DTC application been filed or considered for anyone in the household?
- Caregiver circumstances: Are you providing regular care or financial support to a parent, spouse, or dependant with a physical or mental impairment?
- Medical expenses: Have you tracked all out-of-pocket medical costs for the year, including prescriptions, devices, travel for medical purposes, and private health premiums?
- Home modifications: Has any work been done on your home to improve accessibility or safety — ramps, grab bars, widened doorways, stairlifts, accessible bathrooms?
- Employment and self-employment changes: Any change in employment status, new contracts, new business income, or home office use?
- Family composition: Any change in marital status, new dependants, or adult children who became financially dependent due to disability or education?
- Prior-year review: Is there any reason to review prior years for missed credits? Has a DTC been certified with a retroactive eligibility date?
If your annual appointment does not cover these categories, you are receiving a filing service — not a tax planning interview. There is a meaningful difference between the two, and only one of them justifies a professional fee.
Canadian taxpayers who want to understand their rights around data handling and documentation in digital tax and advisory engagements should also be aware of how PIPEDA applies to the records a firm holds on their behalf. The TAS PIPEDA compliance overview explains what Canadian data residency obligations look like in practice — relevant for any professional practice managing sensitive client information.
Frequently Asked Questions
What is the Disability Tax Credit and who can apply?
The Disability Tax Credit (DTC) is a non-refundable federal tax credit available to Canadian taxpayers who have a severe and prolonged impairment in physical or mental functions. Eligibility is certified by a qualified medical practitioner using Form T2201. The credit can be claimed by the person with the disability or, in many cases, transferred to a supporting person such as a spouse, parent, or caregiver. DTC certification can sometimes be granted with a retroactive eligibility date, which may allow for prior-year adjustments within the available refund-adjustment window.
Can the same home accessibility expense be claimed under both the Medical Expense Tax Credit and the Home Accessibility Tax Credit?
For expenses incurred from 2016 through 2025, a qualifying accessibility expense could potentially be claimed under both the Medical Expense Tax Credit and the Home Accessibility Tax Credit, provided the expense independently met every requirement under each credit. This is not automatic — the specific nature of the expense, who incurred it, and who lived in the home all affect eligibility. Proposed 2026 legislative changes may limit the ability to claim the same expense under both credits going forward, but those proposed changes do not apply retroactively to prior tax years. Always confirm current eligibility rules with your tax preparer, as individual facts determine outcomes.
How far back can a Canadian taxpayer adjust a prior-year return to claim a missed credit?
As of 2026, the general refund-adjustment window for individual T1 returns reaches back to the 2016 tax year. This means that if a credit such as the DTC was missed in a prior year and the taxpayer remains within the adjustment window, a request to adjust prior returns can be submitted using Form T1-ADJ. The window is calculated from the original notice of assessment for each year in question. A professional tax preparer should proactively review whether prior-year adjustments are available whenever a new credit — particularly a retroactively certified DTC — is identified.
What is the Home Accessibility Tax Credit and what expenses qualify?
The Home Accessibility Tax Credit (HATC) is a federal non-refundable credit available on eligible expenses for renovations or alterations that make a dwelling more accessible for a qualifying individual — generally a person who is eligible for the DTC or who is 65 years of age or older. Qualifying expenses typically include permanent modifications such as grab bars, wheelchair ramps, walk-in bathtubs, widened doorways, and stairlifts. The work must be done by an eligible contractor and meet specific conditions. Maintenance, appliance purchases, and purely cosmetic renovations generally do not qualify. The annual eligible expense limit and the resulting credit amount are set by legislation and should be confirmed for the applicable tax year.
What should I do if I think I missed credits in prior years?
Start by gathering documentation for any disability certifications, medical expenses, or home modifications from prior years. Then speak directly with a professional tax preparer — ideally one who will conduct a structured review, not simply re-file what was originally submitted. If a DTC has been certified with a retroactive eligibility date, confirm which prior years fall within the current refund-adjustment window. A T1-ADJ request can be submitted for each eligible year. This is not complicated to initiate, but it does require someone who will ask the right questions and know where to look. This post is educational in nature and does not constitute individualized tax advice — your specific situation should be reviewed by a qualified tax professional.
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