Do You Have to Pay Tax If You Sell on Facebook?

Generally, sell two items in one year, get a seller’s permit. Register on state website, easy.
Collect tax if business has state presence. Otherwise, don’t.
Used items sold at a loss owe no taxes. But if sold for more than acquired, pay on the profit.
Earn $600+ from sales? File a return in 2023 for more 1099-K forms.
Report online sales.
Special organizations and foreign companies sell without value added tax.
Sell used personal items for less than original cost, no income tax. Sell for more, pay capital gains taxes on surplus.

Retail or service owners report in business income.
Online sellers in states without internet sales tax: Alaska, Delaware.
2021 single standard deduction, under 65 is $12,550. No filing under that income.

$20,000 and 200 sales on eBay and others to get a form. Auction income may include income tax.