Disability Tax Credit
The disability tax credit is the money the CRA gives folks with disabilities (or their parents) after the CRA has OK’ed the disability. To quote the CRA on this:
The disability tax credit (DTC) is a non-refundable tax credit that
helps persons with disabilities or their supporting persons reduce the
amount of income tax they may have to pay. An individual may claim
the disability amount once they are eligible for the DTC. This amount
includes a supplement for persons under 18 years of age at the end
of the year.
Applying for the DTC can be a cumbersome process, however, I strongly suggest not using any external firm for help, you can do this yourself, and you should, to ensure you keep the money that is due to you.