Disability Tax Credit (DTC) - information on how to apply for the disability tax credit certificate and what is needed from you and your doctor. Keep in mind it's best to apply the DTC to the highest-income earner in the family as it may reduce their Ontario surtax.
Information on backdating the DTC with a T-1 adjustment form, letter, and supporting documents once you receive the disability tax credit
Canada Child Tax Benefit (CCTB) - for children of all ability levels
Child Disability Benefit (CDB) - a tax-free benefit for parents of children under 18 who qualify for the disability amount. Once your DTC certificate is approved, Revenue Canada should automatically begin calculating and sending this amount.
Registered Disability Savings Plan (RDSP) - for Canadian residents under age 60 who are eligible for the disability amount
Autism Ontario's RDSP information series
Information on Henson Trusts from Autism Ontario