Hi there Nabil Gorguy CPA CMA,
Thank you for contacting us regarding your payroll forms. QuickBooks Online Pay is a tool that can help you with end-of-year forms such as T4 and Relevé 1 forms. I can give you some information about this.
Quickbooks Online isn't able to generate Relevé 3 forms. This should be done outside of QuickBooks Online. I can see that this would be a feature you’d like to see in the software, and I invite you to put that feedback into the system by clicking on the Gear Icon in your QuickBooks account, then Feedback. The comments in this section are considered by developers when creating new features in QuickBooks Online.
If you have any other questions, please feel free to ask them here.