Line 24z is not accessed through the 1099K worksheet. Adjust your 1099K worksheet to show positive income from sale of personal items. Then, in the 'Wages and Income' section of the federal return, scroll all the way down to 'Less Common Income' and then click start next to 'Miscellaneous Income'.
Then scroll to the bottom again and click 'Other Reportable Income.' Here is where you will enter the negative value to offset your 1099K. Enter 'Personal Item Sales' as the description.
@Mr24z
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