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IRS says to report your Form 10kk-K on your tax form, even if all the items were personal sales sold at a loss.

Unless you enter your Form 1099-K and offset the income, IRS will assume the Box 1a amount is 1000%.

Here's what IRS says:

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."

In the example of a refrigerator sale, if you received a Form 1099-K for $600 for the refrigerator for which you originally paid $1,000, you should report the loss transaction as follows:

Form 1040, Schedule 1, Part I – Line 8z, Other Income. List type and amount: "Form 1099-K Personal Item Sold at a Loss …. $600" to show the proceeds from the sale reported on the Form 1099-K

and,

Form 1040, Schedule 1, Part II – Line 24z, Other Adjustments. List type and amount: "Form 1099-K Personal Item Sold at a Loss…. $600" to show the amount of the purchase price that offsets the reported proceeds. Do not report the $1,000 you paid for the refrigerator because the loss on the sale of a personal item is not deductible.

See Form 1099-K Frequently Asked Questions: General

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