Hi ejek6337:
Thanks for your question. I'm editing my original reply. So if we're selling collectible and not really considering this a business then we will report this under "Other Common Income" in TurboTax where you see 1099K listed. You'll report the full amount of the 1099K, but once you get into this section it will ask you questions about how much did you pay for the item. This is where your cost will be figured into the equation. TurboTax is currently working on a new flow for this in our software, so that changes will be accounted for in 2022. So you'll enter the full amount of the 1099K proceeds but you'll also enter your costs on a subsequent question in TurboTax. Thanks again!
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