Sales Tax and Marketplace Facilitator Laws for Resellers

One of the biggest sources of quiet relief for online sellers is a set of state laws you probably never read: marketplace facilitator laws. Because of them, the sales tax on most of what you sell through a major platform is collected and sent to the state by the platform itself, not by you. That does not mean sales tax has disappeared from your world, and it definitely does not mean you have no tax to worry about, because sales tax and income tax are two entirely separate things. This guide untangles the two, explains what the facilitator laws actually do, and tells you when you might still have a filing of your own.

Two different taxes people constantly confuse

Sales tax is a tax the buyer pays on a purchase, collected by the seller and handed to a state or local government. Income tax is a tax you, the seller, pay on your profit. They are unrelated in almost every way: different taxpayer, different government levels, different forms, different timing. When a reseller says they are worried about taxes, they usually mean income tax on profit, which is a federal-and-state question handled on a return like Schedule C (Form 1040) and reported partly through Form 1099-K. Sales tax, by contrast, is a state-level charge on the transaction. Keeping these two straight is the first step, because the marketplace facilitator story is entirely about sales tax and changes nothing about your income tax.

What marketplace facilitator laws did

After the 2018 Supreme Court decision in South Dakota v. Wayfair, states gained clear authority to require sales tax collection from remote sellers. Rather than chase millions of individual sellers, states passed marketplace facilitator laws that put the collection duty on the marketplace, the facilitator, that processes the sale. Over a short span nearly every state with a sales tax adopted such a law. The result is that when your item sells through eBay, Poshmark, Mercari, or Etsy, the platform calculates the sales tax based on the buyer's location, adds it to what the buyer pays, and remits it to the correct state. You typically see it as a line on the order that you never touch and never send anywhere yourself.

Why the fee math still notices it

Even though the platform handles the remittance, sales tax can still touch your economics in one indirect way: on some platforms the selling fee is calculated on the full buyer-paid total, which includes the collected sales tax. eBay, for instance, applies its final value fee to the item price, the shipping you charge, and the tax the platform collects. That means a small slice of the fee you pay is effectively charged on tax you never see as income. It is not a large amount on any one order, but it is a reason the true fee percentage on a sale is a touch higher than the headline rate, and a reason to run real numbers rather than eyeball them. The eBay Promoted Listings Breakeven tool and its companion sourcing calculator work from buyer-paid totals for exactly this reason.

When you might still owe a sales tax filing

For most resellers who sell only through big marketplaces, the facilitator laws mean no sales tax registration and no sales tax return. But there are edges. If you sell through your own website, at in-person markets, or through a channel that is not a covered marketplace facilitator, you can be the party responsible for collecting and remitting sales tax, which may require registering with your state. Some states also still expect marketplace sellers to hold a permit or file an informational return even when the platform remits, and rules differ from state to state. Because this is state law rather than federal, there is no single national answer. Check your own state's department of revenue for its marketplace facilitator rules and any registration duty that applies to your channels.

Why buyers pay different amounts in different states

One thing that puzzles new sellers is that two buyers can pay different sales tax on identical items. That is not a mistake and it is not something you control. Sales tax rates are set by states, counties, and cities, so the tax is calculated from where the buyer is, not where you are. A buyer in a state with no sales tax pays none; a buyer in a high-rate city pays more. The platform handles all of this automatically through its facilitator systems, applying the correct combined rate for each buyer's address. For you the seller, the takeaway is simply that the tax line on an order is not part of your pricing and not part of your income, no matter how much it varies from one sale to the next.

What this means for your records

For bookkeeping, the clean approach is to treat platform-collected sales tax as pass-through money that is not your revenue and not your expense. When you reconcile a payout, the sales tax the platform collected and remitted should not land in your profit calculation at all. What you record as revenue is the item price and any shipping you charged; the sales tax simply flows through. Keeping it out of your income figures prevents you from overstating revenue, which matters when you compare your books to a Form 1099-K. Our bookkeeping and records guide shows a simple way to log payouts so the pass-through amounts stay separate, and the platform fees and 1099-K overview puts the fee and form picture together.

This article is general information, not tax or legal advice. Sales tax is governed by state law and varies widely; income tax rules come from the IRS at IRS.gov. Confirm your obligations with your state department of revenue and a qualified tax professional. The tools referenced live on the Reseller Math hub.