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Does Poshmark Remit Your Sales Tax? What TN Boutique and Shopify Sellers Get Wrong

If you sell on Poshmark, you've probably noticed something: you don't set a tax rate, you don't collect it at checkout, and yet a "sales tax collected" line still shows up on your year-end statement. So is that handled? Do you owe anything else?

The honest answer: it depends entirely on where else you sell. That's the part that trips up almost every Tennessee retailer we talk to who sells on more than one channel.

We worked with a client recently who ran a small retail operation on both Poshmark and their own Shopify storefront. They assumed that because Poshmark handled sales tax, their Shopify sales were covered too. Same category of platform, same assumption. They weren't. That gap is exactly what this article is about.

What "marketplace facilitator" actually means in Tennessee

Since October 1, 2020, Tennessee law has required certain online platforms, called marketplace facilitators, to collect and remit Tennessee sales tax on behalf of the sellers using them, once that platform does more than $100,000 in sales to Tennessee customers in a 12-month period. Poshmark, Etsy, Amazon, eBay, and Walmart Marketplace all fall into this category. When you sell through one of these platforms, the platform, not you, is legally responsible for collecting the tax from your buyer and sending it to the state.

That's genuinely useful. It means you're not the one calculating rates across every Tennessee jurisdiction or filing on those specific sales. But "marketplace facilitator" is a specific legal status, not a synonym for "online selling platform." That's where Shopify gets misunderstood.

Shopify is usually not a marketplace facilitator, and that surprises people

Here's the distinction that matters most: if you run your own Shopify store, with your own domain and your own checkout, you are the seller of record on every sale that happens there. Shopify provides the software, the checkout page, and the tax-rate calculation tools. It does not collect the buyer's payment on your behalf and remit tax the way Poshmark does. That responsibility stays with you.

There's one exception worth knowing: Shopify's Shop app (the separate shopping app, not your own storefront) has been treated as a marketplace facilitator since January 1, 2025 for sales that route through it. If a customer buys through the Shop app itself, Shopify handles that tax. If they buy on your own site, even one built on Shopify, you do.

So the same seller can have:

• Poshmark sales: tax collected and remitted by Poshmark
• Own-Shopify-storefront sales: tax collection and remittance is on you
• Shop app sales: tax collected and remitted by Shopify

Three different answers to "who handles this," all under one seller, all in the same month.

The mistake isn't selling on multiple platforms. It's assuming they all work the same way.

What your Poshmark (or Etsy, or Amazon) year-end statement actually covers

Your marketplace year-end statement, whatever the platform calls it, is a summary of the sales tax that platform collected and remitted on your behalf, on sales made through that platform. That's it. It doesn't reflect:

• Sales through your own website or Shopify checkout
• In-person or pop-up sales rung up outside the marketplace
• Wholesale sales you handled directly
• Any other platform you sell on

If your only sales channel is a true marketplace facilitator, that statement is close to your whole sales tax picture. If you sell anywhere else too, it's one piece of it. Treating it as the whole picture is exactly how gaps get missed until an audit or a registration notice finds them first.

What still goes on your Tennessee sales tax return

This is the part that catches people off guard in both directions.

If Tennessee already requires you to be registered for sales tax (because you have a physical presence in the state, or you've crossed the $100,000 economic nexus threshold on your own direct sales), you generally still need to file returns, even in periods where all your sales ran through a marketplace facilitator. Tennessee's guidance is clear that marketplace sales get reported as exempt or excluded from your taxable sales, not just left off the return entirely. A registered dealer whose sales were 100% marketplace-facilitated in a given period may still owe a zero return, not no return.

If you also sell directly (your own Shopify store, wholesale, in person), those sales are yours to collect and remit tax on, and they go on your return as taxable sales like any other direct sale. Nobody is doing that step for you just because a different channel is covered somewhere else in your business.

The failure mode we see most often isn't sellers trying to cheat the system. It's sellers assuming "the platform handles tax" as a blanket statement, when it's actually a channel-by-channel answer.

When you take the credit, and when there isn't one

To be precise: there's no literal "tax credit" for marketplace-collected sales on your Tennessee return. What happens instead is that those sales get excluded from the taxable sales you report and remit on directly, because the platform already collected and sent that tax to the state. You're not double-paying. But you're also not automatically covered on anything the marketplace didn't touch. The exclusion only applies to the specific sales that specific facilitator actually processed and remitted tax on.

That's a narrower promise than "sales tax is handled," and it's worth checking channel by channel rather than assuming.

The takeaway for Tennessee sellers running more than one channel

If you sell on Poshmark, Etsy, Amazon, or another true marketplace facilitator, that platform is doing real, legally required work on your behalf. Trust it for those sales. But the moment you add your own Shopify storefront, a wholesale account, or in-person sales, you've added a channel that's entirely your responsibility. The safest habit is simple: know, channel by channel, who is actually the seller of record for tax purposes, and don't assume the answer is the same for all of them.

If you're not sure where your business currently stands across your sales channels, that's exactly the kind of thing a clean set of books should tell you at a glance, not something you find out for the first time when a notice arrives.