The 1099k net amount and all amounts entered both positive and negative show up under line 8z and "See Stmt" with detail for each line entered. However according to the IRS instructions, both line 8z for proceeds and 24z for costs should be used. If I remove the costs and override the costs to line 24z I get errors, please clarify.
See https://www.irs.gov/newsroom/form-1099-k-faqs-what-to-do-if-you-receive-a-form-1099-k
"Report your proceeds (the Form 1099-K amount) on Part I – Line 8z – Other Income, using the description “Form 1099-K Personal Item Sold at a Loss.”
Report your costs, up to but not more than the proceeds amount (the Form 1099-K amount), on Part II – Line 24z – Other Adjustments, using the description “Form 1099-K Personal Item Sold at a Loss.”
