@RaifH
I think you can accomplish the same thing by overriding the average values for loans in the Deductible Home Mortgage Interest Worksheet. Is that a valid method vs altering the 1098 values? There is nowhere to indicate that I used interest rate method, and there is no supporting info possible on the override of the average loan principal.
There is also a serious bug in the desktop Premier edition that comes up with the wrong deduction. I had a loan from before 2017 that I refinanced twice without cashing out. This means it should be home aquisition loan from before 2017 -- but if I tick the box "yes" on line D on Home Int Wkst (Debt originated before 12/15/17) [by the way, there is are no intructions for line D in turbotax] then the Deductible Home Mortgage interest worksheet removes all loan information except for "Enter Amount of debt used to buy, build..." line which doesn't propagate anywhere, and the value in line 2 of that worksheet (Part 1 qualified loan limit) is not filled in. If I overide the average balance as I described above, then that shows up on line 2. But again, it's a bug that this loan doesn't show up otherwise. I don't think the loan can just be ignored because otherwise the total loan amount, including a different loan I didn't discuss here, is over the limit. [As a side note -- the way this worksheet works, it doesn't matter if the loan from before 2017 was under $1MM and interest fully deductible, it winds up applying a $750k limit to the sum of both average principals anyway, no different that if it had originated after the lower limit was imposed.]
