Note business accounting question

[John Newsom]

First year in note investing and looking forward to end of year accounting. I trying to find a CPA, preferably, in Gainesville, FL area and trying to have some screening questions to ask them.

Background: l purchase a note for 50% of UPB and a payment is made.

Question: Is the principal that is collected 100% principal repayment, or, is it 50% principal repayment and 50% capital gain?