Canadian Disability Tax Guide: Disability Supports Deduction, T929 & CRA Guides
Complete guide to Canadian disability tax benefits. Understand the Disability Supports Deduction (Line 21500), eligible expenses, T929 form, and how to maximize your CRA deductions.
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Inclusion rate, ACB math, superficial-loss rules, and carryback windows — the CRA rules you actually need at tax time.
- The 50% inclusion rate and how it is applied
- Adjusted cost base (ACB) formula with an example
- Superficial-loss 30-day rule
- Capital-loss carryback (3 years) and carryforward
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Open the Canada Capital Gains Cheat SheetCanadians with disabilities have access to significant tax relief through the Disability Supports Deduction (Line 21500) — a deduction often overlooked even by those who qualify. Unlike the Disability Tax Credit, this deduction does not require a DTC certificate and covers a broad range of expenses paid to work, study, or run a business.
The Disability Supports Deduction (Line 21500)
The Disability Supports Deduction allows eligible Canadians to deduct the cost of devices and services that enable them to earn employment or business income, or to attend school.
Who Qualifies?
You qualify if you have a physical or mental impairment that is prolonged (lasting or expected to last 12+ months continuously) and that restricts your ability to perform activities of daily living. Crucially:
- You do not need a Disability Tax Credit certificate
- The impairment can be physical, cognitive, or mental health-related
- Students with disabilities qualify even with little or no employment income
Calculation Limit
Your deduction is the lesser of:
- Eligible expenses actually paid
- Your employment or business income plus any school-attendance bonus ($375/week for full-time students)
The school-attendance bonus is particularly important for disabled students with limited earned income — it creates a meaningful deduction ceiling even when employment income is zero.
Form T929: Step-by-Step
Form T929 is used to calculate the Disability Supports Deduction. It requires:
- Total eligible expenses paid in the tax year
- Employment and business income (from T4s, T2125, etc.)
- School attendance weeks (if applicable)
- The lesser of the above — this amount flows to Line 21500 of your T1
Eligible vs. Ineligible Expenses
Eligible expenses include: sign language interpreter fees, real-time captioning, Braille note-takers, voice recognition software, talking textbooks, service animal costs, and certain attendant care expenses.
Important: The same expense cannot be claimed for both the Disability Supports Deduction (Line 21500) and the Medical Expense Tax Credit (Line 33099). Depending on your income, one may be more valuable than the other.
Disability Supports Deduction vs. Medical Expense Tax Credit
The Medical Expense Tax Credit (METC) is a non-refundable credit calculated at the lowest federal rate (15%) on eligible expenses above a threshold. The Disability Supports Deduction reduces income at your marginal rate.
- Higher marginal tax rates → Deduction (Line 21500) is usually better
- Lower marginal tax rates → METC may provide equal or greater benefit
- Some expenses qualify for only one → choosing wisely requires calculating both options
Related Hubs
- Canadian Capital Gains Hub — Other CRA tax strategies for Canadians
- Federal Income Tax Hub — Understanding marginal rates and how deductions work
- Savings & Personal Finance Hub — Planning finances with a disability or chronic condition