Hello there, Cemuckle. Setting up the HST charity rebate in QuickBooks Online can be complex, as the configuration must precisely match your registered tax status with the CRA.
To ensure your filings are accurate, consider working with an accountant or bookkeeper experienced in Canadian non-profit tax standards to help you set up the HST charity rebate.
If you haven't found one yet, consider hiring a QuickBooks Certified ProAdvisor who is knowledgeable about both QuickBooks Online and the CRA requirements for charities.
Please let me know if you need any further assistance.