As per the Canada Revenue Agency (CRA), if your husband has a severe and prolonged impairment, he may apply for the credit. If he is approved, he may claim or transfer the credit at tax time. He must be approved first.
To learn more about the Disability Tax Credit (DTC), please see this CRA webpage: Disability Tax Credit (DTC)
Make sure to include yourself on the application, as the one the unused DTC can be transferred to. If he is eligible and is allowed the DTC, you will be allowed to have an adjustment made to your returns.
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