--- title: "T929 Disability Supports Deduction Calculator (Canada)" description: "Calculate your Disability Supports Deduction for line 21500 of your Canadian tax return. Mirrors Form T929 exactly — includes the student school-attendance bonus and estimated tax savings." canonical_url: "https://www.themoneypocket.com/tools/disability-supports-deduction-calculator" last_updated: "2026-05-01T16:53:14.649Z" --- **Claim every dollar you're owed.** This calculator mirrors Form T929 line by line, handles both the standard and student paths, and shows your estimated tax savings at your marginal rate. ## What is the Disability Supports Deduction? The Disability Supports Deduction (line 21500) lets Canadians with a physical or mental impairment deduct the cost of devices and services they paid for so they could work, run a business, do funded research, or attend school. It reduces your taxable income — not just a credit — which means the benefit scales with your marginal rate. To learn who qualifies and what counts as eligible, read the full guides below. ## How the T929 calculation works The form has two steps: **Step 1** subtracts any reimbursements or non-taxable assistance you received from your total expenses paid. The result is your *net disability supports expenses*. **Step 2** determines the ceiling on what you can actually deduct. That ceiling is your earned income — unless you also attended school. If you did, a school-attendance bonus (number of weeks × $375, capped at $15,000) is added to raise the ceiling. Your deduction is whichever is less: the net expenses from Step 1 or the ceiling from Step 2. The final number goes on line 21500 of your T1. ## Key rules to remember - **Expenses must be claimed in the year they were paid.** There is no carry-forward for unused amounts. - **You cannot double-claim.** Any expense deducted here cannot also be claimed as a medical expense on line 33099/33199. Read the [comparison guide](/articles/disability-supports-vs-medical-expense-credit) to decide which gives you the better outcome. - **Reimbursements reduce your claim.** Insurance payouts and government subsidies come off the total — unless those reimbursements were included in someone's income. - **Receipts are required.** Keep all receipts in case the CRA requests them. Attendant care receipts must include the provider's Social Insurance Number. ## Related guides - [What is the Disability Supports Deduction? Complete Canadian Guide](/articles/disability-supports-deduction-canada) - [Complete List of Eligible Disability Support Expenses in Canada](/articles/eligible-disability-support-expenses-canada) - [Who Qualifies for the Disability Supports Deduction?](/articles/who-qualifies-disability-supports-deduction-canada) - [How to Complete Form T929: Step-by-Step](/articles/t929-form-step-by-step-guide) - [Disability Supports Deduction vs. Medical Expense Tax Credit](/articles/disability-supports-vs-medical-expense-credit) - [The $375/Week Student Bonus Explained](/articles/disability-supports-deduction-students-canada) --- *Disclaimer: This calculator is for planning purposes only. It mirrors the 2024 edition of Form T929. Tax rules change annually. Consult a qualified Canadian tax professional or the CRA for advice specific to your situation.*