Whatnot Sales Tax: What Every Seller Needs to Know in 2026
Whatnot Sales Tax: What Every Seller Needs to Know in 2026
Last updated: April 2026 | Reading time: ~8 minutes
The short answer: Whatnot collects and remits sales tax on your behalf in most states because it qualifies as a marketplace facilitator. But "most states" isn't all states — and even where Whatnot handles the tax, you may still have registration and filing obligations of your own.
This guide covers everything a Whatnot seller needs to know about sales tax in 2026: what Whatnot handles, what you still owe, and how to stay compliant without losing sleep.
Does Whatnot Collect Sales Tax on Your Sales?
Yes — in the vast majority of U.S. states, Whatnot acts as a marketplace facilitator and is legally required to collect and remit sales tax on transactions made through its platform.
A marketplace facilitator is a company that facilitates sales between buyers and sellers and processes the payment. Under laws enacted in nearly every state after the 2018 Supreme Court decision in South Dakota v. Wayfair, marketplace facilitators are responsible for collecting and remitting sales tax — not individual sellers.
Whatnot confirms on its help center that it collects and remits sales tax in states where it is legally required to do so as a marketplace facilitator.
What this means for you: In states with marketplace facilitator laws, Whatnot collects sales tax from buyers and sends it to the state. You don't touch the money, and in most cases you don't need to file a sales tax return for those Whatnot sales.
Which States Have Marketplace Facilitator Laws?
As of 2026, 45 states plus Washington D.C. have marketplace facilitator laws that require platforms like Whatnot to collect and remit sales tax. The five states without a statewide sales tax are:
- Oregon — no sales tax at all
- New Hampshire — no sales tax at all
- Montana — no sales tax at all
- Delaware — no sales tax at all
- Alaska — no statewide sales tax (but some local jurisdictions collect)
In all other states (where sales tax exists), Whatnot handles the collection and remittance.
For the current list of states where marketplace facilitator laws apply, see the Streamlined Sales Tax Governing Board's resources.
When YOU Still Owe Sales Tax as a Whatnot Seller
Here's where sellers get confused: just because Whatnot collects sales tax doesn't mean you have zero sales tax obligations.
1. If You Sell Outside of Whatnot
Whatnot's marketplace facilitator coverage only applies to sales made on Whatnot. If you also sell on your own website, at pop-up markets, or through direct invoices, you are responsible for collecting and remitting sales tax on those sales yourself.
2. If You Have Economic Nexus in Multiple States
Economic nexus is triggered when your total sales into a state exceed that state's threshold — typically $100,000 in sales or 200 transactions in a calendar year (the standard set by South Dakota v. Wayfair). Once you have nexus in a state, you may be required to register with that state even if a marketplace facilitator collects the tax for your platform sales.
Some states require registration as soon as you cross their threshold, regardless of whether a marketplace facilitator is collecting on your behalf. This is state-by-state, so read carefully.
3. States That Still Require Seller Registration
Even in states where Whatnot collects the tax, some states require the underlying seller to register for a sales tax permit once they cross the economic nexus threshold. States with this requirement include:
- California — Sellers who exceed $500,000 in total California sales must register, even if a marketplace collects the tax
- Washington — Sellers with Washington nexus must register with the DOR
- Texas — Similar registration requirements apply
Check each state's Department of Revenue for specific requirements. The California Department of Tax and Fee Administration and Washington Department of Revenue have dedicated remote seller pages.
4. Sales Tax Holidays and Exemptions
Marketplace facilitator rules don't change exemption rules. If a buyer presents a valid resale or exemption certificate, the transaction may not be taxable regardless of what Whatnot does by default. Make sure you understand how to handle these in your selling workflow.
Understanding Economic Nexus Thresholds for Whatnot Sellers
Economic nexus is the concept that you can owe sales tax in a state you've never physically visited simply because you sell enough there. Post-Wayfair, every state with a sales tax has an economic nexus threshold.
Standard threshold: $100,000 in annual sales OR 200 transactions into a state.
Higher thresholds (exceptions):
- Alabama: $250,000 in sales (uses SSUT — Simplified Sellers Use Tax)
- Mississippi: $250,000 in sales
- Oklahoma: $100,000 in sales only (no transaction count threshold)
Important: For Whatnot sellers, marketplace-facilitated sales count toward your economic nexus threshold in most states, even though Whatnot collects the tax. You may cross a nexus threshold without realizing it because all you see is your net payout.
Track your gross sales by state, not just your take-home pay. Whatnot provides sales reports; download them and run the numbers.
How to Register for Sales Tax (Step by Step)
If you determine you have economic nexus in a state and need to register:
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Identify which states — Use Whatnot's sales data + any other channel data to find states where you've crossed thresholds.
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Register directly with each state's DOR — Most states have online registration through their Department of Revenue. For example:
- California: CDTFA Online Registration
- Texas: Texas Comptroller Sales Tax Registration
- Washington: Washington DOR Business Licensing
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Use the Streamlined Sales Tax Registration System (SSTRS) — If you have nexus in multiple SST member states, you can register in all of them at once at streamlinedsalestax.org. This is free and covers 24 states.
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Determine your filing frequency — States assign filing frequencies (monthly, quarterly, annual) based on your sales volume. Low-volume sellers typically file annually.
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File returns — Even if Whatnot collected all the tax, you may still need to file a $0 return to stay compliant. Failure to file can trigger notices and penalties.
The Voluntary Disclosure Option
If you've been selling on Whatnot for a while and you're worried you should have registered in states where you had nexus, there's good news: most states have Voluntary Disclosure Agreement (VDA) programs that let you come forward, pay what you owe (often with reduced penalties), and get clean.
The Multistate Tax Commission's Voluntary Disclosure Program lets you apply to multiple states simultaneously.
Don't wait for a state notice to act. VDAs almost always result in better outcomes than audits.
How Taxero Makes This Simple
Taxero was built specifically for sellers like you — people who sell on multiple platforms and need to track nexus across dozens of states without becoming a tax accountant.
With Taxero, you can:
- Connect your Whatnot account (and all other platforms) to track gross sales by state automatically
- Get nexus alerts when you're approaching or have crossed a threshold in any state
- File returns automatically — we handle the filing, you focus on selling
- Stay clean for $49.99/month (Managed) or $19.99 per filing (Self-Serve), with no hidden fees
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No credit card required. Setup takes 10 minutes.
Frequently Asked Questions
Q: Does Whatnot collect sales tax in all 50 states? A: Whatnot collects and remits sales tax in all states that have marketplace facilitator laws and a statewide sales tax. The five states with no sales tax (Oregon, New Hampshire, Montana, Delaware, Alaska) have nothing to collect. As of 2026, this means Whatnot handles sales tax in 45 states plus D.C.
Q: Do I still need to register for sales tax if Whatnot collects it? A: In some states, yes. California, Washington, and several others require sellers to register once they cross the economic nexus threshold, even if a marketplace facilitator is collecting the tax. The registration requirement is separate from the collection obligation. Check your specific state's DOR for current rules.
Q: Do my Whatnot sales count toward my economic nexus threshold? A: Yes, in most states. Your total gross sales into a state — including marketplace-facilitated sales — count toward the threshold. You can cross $100,000 in California sales entirely through Whatnot and still be required to register, even though Whatnot collected all the tax.
Q: What happens if I ignore sales tax and don't register? A: States actively audit online sellers and purchase sales data from marketplaces. Penalties vary by state but can include: back taxes owed, interest (typically 5–10% annually), and penalties (often 10–25% of the unpaid tax). In severe cases, states can pursue collection actions. It's not worth the risk.
Q: Does Whatnot send me a 1099 that I need to report? A: Whatnot sends 1099-K forms to sellers who meet federal thresholds. The 1099-K reports gross sales — this is gross revenue and is relevant for income tax, not just sales tax. Sales tax and income tax are separate obligations. Your 1099-K gross sales are not all income (you can deduct your cost of goods), but sales tax nexus is based on gross sales.
Q: What if I only sell occasionally on Whatnot — do I still owe sales tax? A: If your total Whatnot sales in any state are below the economic nexus threshold (generally $100,000 or 200 transactions), and you have no physical presence in that state, you likely don't need to register. Whatnot will still collect sales tax from your buyers; you just don't have a personal filing obligation. Keep an eye on your numbers as you grow.
Q: What is the best sales tax software for Whatnot sellers? A: Taxero is built specifically for marketplace resellers, with direct integrations for Whatnot, eBay, Etsy, TikTok Shop, and other platforms. At $49.99/month (Managed) or $19.99/filing (Self-Serve), it's designed for the SMB seller — not enterprise. See taxero.ai for details.
Primary Sources
- Whatnot Help Center — Sales Tax
- Streamlined Sales Tax Governing Board — Marketplace Facilitator Laws
- South Dakota v. Wayfair, 585 U.S. ___ (2018) — Cornell LII
- California Department of Tax and Fee Administration — Remote Sellers
- Multistate Tax Commission — Voluntary Disclosure Program
This post is for informational purposes only and does not constitute tax advice. Consult a licensed CPA for advice specific to your situation. Tax laws change frequently; verify all thresholds and requirements with the relevant state's Department of Revenue.
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