Submitted today. Waiting game begins! 

Tax return: No, IRCC will get that data from CRAHey while applying online do we have to attach tax return NOAs. I don't see any option to attach the documents in the residency and tax section. Also do we have to submit all the pages of passport. The portal says only info pages of the passport.
Where did you submit it ? Additional documents ?Tax return: No, IRCC will get that data from CRA
Passport: You only need the info page where they state it; however, I just submitted all just in case haha