This is a helpful thread but I still have a couple questions...If the loss was reported on 4797 as an ordinary loss in 2017 and it wasn't used up, where do you report the remaining amount in 2019? (2018 had no income.) What form and what supporting documentation for the remaining loss?
Is it different if it is an individual vs a Trust (final year)? Do I distribute the remaining loss from a 4797 on a K-1 box 6?
2017 had a loss on 4797 as well as a loss on schedule E (rental property with negative income AND sold for a loss, in service less than 1 year.)
TIA
