Yes, you would still be eligible to receive the OTB credit if you still reside with your parents. The Ontario Trillium Benefit (OTB) is the combined payment of the Ontario energy and property tax credit, the Northern Ontario energy credit, and the Ontario sales tax credit. In order to be qualified for the Ontario Trillium Benefit you must be eligible for one of the three credits as per mentioned above. To know if you are fully qualified for the OTB you can follow this link from the Ontario government to receive further information.
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