u/Ekagata1111

I have not done my taxes for nearly ten years, been on ODSP for longer than that and have not earned any income either. I want to apply for the Disability Tax Credit so that later I can apply to the Canada Disability Benefit.
Is it necessary to have done my taxes first to apply for th DTC or can I apply for it before I get my taxes done? I have read here several of you get charged high doctor fees to have them fill out the DTC application with you. I am ok with having to pay out of pocket if needed, if it means getting this done. Thanks in advance.