I did a few run throughs using different settings for the same scenario, and I can't really get any method that will work correctly. These are the parameters I used.
Primary Residence - 1 Jan - 31 Mar 2019
Residential Rental Real estate 1 Apr - 15 May 2019
Primary Residence - 16 May - 31 Dec 2019
The best scenario that worked for me was showing the property converted to rental 1 Apr with 100% business use and conversion back to personal use on 16 Mar. It required me to split the mortgage interest and property taxes myself, as well as pro-rate the insurance costs. All other expenses were 100% deductible. (I only claimed those expenses incurred for the 45 days the property was a rental, including utilities.)
Now I did see where during the initial setup process I was asked if I'd used this property for business in the past. If I select no, then no issues. But if I select yes then I'm asked for all prior depreciation taken. That number "seems" to be taken into account correctly and doesn't "appear" to mess things up. But I've not yet dived into the forms and worksheets to confirm that. Overall though, based on the numbers I see it appears to be dealing with prior business use of the property correctly.
