You cannot claim the unused part of the disability amount if your dependant's spouse or common-law partner is:
claiming the disability amount for your dependant already
claiming any other non-refundable tax credit (other than medical expenses) for your dependant
As there are multiple exceptions and entries that may be affecting this transfer, we believe your best option is to contact our telephone support team for further assistance, as they have the option to view your screen to help resolve the issue. To contact them, please follow this link: Contact Us.