I believe that eBay is collecting sales tax for only a handful of states at the moment. There are several reasons for this:
1. Not all states collect sales tax.
2. The states requested eBay to collect the sales taxes after a 2018 Supreme Court ruling overturned the long-standing federal law that sales tax could only be collected if the seller (considered eBay here) had a physical presence, allowing for sales tax collection on internet transactions across state lines.
More states will likely do the same, but haven’t at the moment. It’s also not up to the seller - eBay collects it separately for those specific states based on where the seller is located.
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