I purchased and sold some sports cards on ebay back in 2020. I recently realized I needed to report this income, so am amending to do so. I made money on some, lost on others. When reporting the investment income, is it as simple as subtracting the total amount I paid from what they sold for to get the amount I gained (is it just a net number of all the transactions combined)? Also, are shipping costs I paid to get them, or that they paid a factor?
