I filled out the IRS worksheet by hand to check my case, which is a home sale and purchase in 2020. I did not own two homes at any time. The average loan balance over the year must be calculated for each loan, but it seems TT is treating my case as though I owned two homes all year, or did a very simple or biased form of averaging, which imposes an incorrect limit on my mortgage interest deduction. TT doesn't offer a worksheet to compute this, and appears to be depriving me of a third of my allowed interest deduction. I would like a fix ASAP so I can file correctly.
