I'm experiencing the same issue and confusion. Has the CCA data entry system changed since this 2019 post?
I understood from prior years and from other people's posts on here that when adding a new CCA item I should put 50% of the total cost in each spouses' CCA page (e.g. 50% of cost of furnace). But it looks like Turbotax software is then is only adding 50% of this amount to the base amount (i.e. resulting 25% of CCA per partner instead of 50%).
I see multiple posts on here that state to enter 50% of CCA in "Total cost" - but two Turbotax staff I spoke to said to enter 100%.
I know in the first year after expense you can only claim 50% of eligible amount (i.e. 2% for class 1) but this should affect the amount claimed that year, not the "cost" or "base amount".
