If the CRA approves the Disability Tax Credit, they can pay you back for up to 10 past years. Answer 4 questions to see your estimate.
Free. Nothing stored. No percentage fees, ever. You keep 100%.
Quebec has a separate provincial system, so this calculator covers the other nine provinces. The federal part still applies in Quebec.
Not sure? Pick your best guess. Your doctor confirms the real start date on the form.
Children get a larger credit, and approval can also unlock the Child Disability Benefit on top of this estimate.
This matters because the credit gives back tax that was paid. If the person paid no tax, a supporting family member can often claim it instead.
Your estimate, if approved back to :
| Year | Federal | Provincial | Total |
|---|
Download Form T2201 from the CRA website, fill in Part A yourself (name, address, and how the disability affects daily life).
Bring Part B to your doctor or nurse practitioner. They confirm the condition and, importantly, the year it started. Ask them to write the earliest accurate start year.
Send the form to the CRA (online through My Account, or by mail). When you send it, tick the box asking the CRA to adjust your past returns automatically.
If approved, the CRA reassesses your old returns and mails the refund. If the person with the disability paid little tax, ask the CRA to apply the transfer to the supporting family member.
Is this estimate guaranteed?
No. It's an honest estimate of the maximum combined federal and provincial credit for your years and province, using CRA published amounts. Your real refund depends on the tax actually paid each year and what the CRA approves.
Why do some companies charge 20-30% of the refund?
Because people don't know they can apply themselves. The paperwork is one form. On a $20,000 retroactive refund, 25% is $5,000 kept by a middleman for a form your doctor fills most of.
What about the Child Disability Benefit?
If a child is approved, the family may also get retroactive Child Disability Benefit payments on top of this estimate. The CRA recalculates the current and two previous benefit years automatically; ask in writing for older years.
This calculator is for information only and is not tax, legal, or medical advice. Estimates use CRA published disability amounts (2016-2025) and lowest tax rates, including the blended 14.5% federal rate for 2025. Everything runs on your device; we don't see or store your answers. Sources: CRA Guide RC4064, canada.ca line 31600/31800, Department of Finance (2025 rate change). Verified July 2026.