The child disability benefit (CDB) is a tax-free monthly payment made to families who care for a child under age 18 with a severe and prolonged impairment in physical or mental functions.
To get the CDB:
You must be eligible for the Canada child benefit (CCB)
Your child must be eligible for the disability tax credit (DTC)
If you are already getting the CCB for your child who is eligible for the DTC, you do not need to apply for the CDB. You will get it automatically.
If this is the first time you’re getting the CDB, the CRA will automatically calculate your payments for the current and two previous benefit years. The benefit year runs from July of one year to June of the following year. For years before that, send a written request to your tax centre.
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Information source from Canada Revenue Agency (CRA)
