If I make a $1000 investment in peer-to-peer lending, then are the repayments simply taxed as interest payments, similarly to interest earned in a savings account, or is there a reflection of the cost basis like you have when investing in stocks or ETFs?
For example, if I were to invest $1000 in a stock then sell it within the same year for $1200, I would only pay capital gains taxes on the $200 profit. If the loan repayments for a single year total $400 (assuming a 3-year loan that would repay $1200 overall with equal payments), do I pay taxes on all $400 or is there an adjusted cost basis of $333 (or something) so I'd only pay taxes on $67 of the original $400 repayment?