Yes, they obviously see the cash.
Think about it for a second, your gonna withdraw ebay money to your real name bank account. It's very likely that your bank has you SSN, because you have to give it to them when you open the account.
They will see the gross amount coming in.
Item cost + profit + shipping charges.
If you don't make a huge amount per/year off eBay, it won't be a big deal not reporting any earnings, but if you make $10,000+, you may have some issues with them, perhaps getting audited.
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