When I originally reported this issue, the problem was that the financial institution reported all slips to CRA only for the primary account holder (which was me), even though my wife contributed 100% of the funds (inheritance).
TurboTax then imported the slips (T5, T3, T5008) from my CRA account, and associated it with my return, but did not allow me to enter 0% for my attribution. The slips did not show up under my wife's return, and there is no way to "re-assign" these to the spouse return in TurboTax.
So I had to delete all these imported slips from my return, and manually re-enter them on my wife's return. After that TurboTax defaulted the income attribution to 100% (for my wife) so I did not have to change anything.
But I fully expect CRA to re-assess my 2023 return and ask me to explain/ prove that what I reported is in fact correct and I am not playing games with income splitting.
With the paired joint accounts I described in the prior post you avoid all the issues (the "bug" in TurboTax as well as raising flags with CRA).
