If you are a corporation or a "doing business as" then those forms do have where interest 1099-INT goes. For an individual, in my return they all go as my personal interest.
On a schedule E there are just a few kinds of income that can be reported. Rents (7 kinds), and Royalties. I do not see any place for the INT to go with out being organized as separate rental operation. (Corp or "doing business as", both start on the sched C first)
Loss reporting is very limited in last 2 decades or so. Gross income must be below 100K and some other rules. Like hours of participation and such. Also limited to 25k loss max. A sliding partial loss allowed up to 150K.
If you have losses, they carry forward to years that have more profits to offset them.
