Economic nexus gets the headlines, but the older rule is still in force: if your goods sit in a warehouse in a state, you are physically present there. For Amazon FBA sellers, that presence can spread to many states without a single decision on your part, because Amazon places and moves inventory across its fulfillment network. Marketplace facilitator laws handle the tax on Amazon orders, but they do not erase the nexus itself. This guide explains FBA warehouse physical nexus sales tax rules, the traps they create, and how to manage them.
Key takeaways
- Inventory stored in a state generally creates physical nexus there, with no minimum sales or transaction threshold.
- Amazon decides where FBA inventory goes, so your nexus footprint can include states you never chose.
- Amazon collects tax on Amazon orders, but you must collect on your own website, wholesale and Multi-Channel Fulfillment orders into nexus states.
- Inventory can also create income, franchise, gross receipts or property tax obligations that marketplace laws do not cover.
Why Inventory Creates Physical Nexus
Before Wayfair, physical presence was the only test, and property in a state, including inventory held for sale, was a classic form of it. That rule still applies. Unlike economic nexus thresholds, physical nexus has no dollar floor: a single pallet in a fulfillment center can be enough.
It does not matter who owns the building. Your inventory in Amazon’s warehouse, a third-party logistics (3PL) facility or a Walmart Fulfillment Services center is still your property in that state. See our overview of sales tax nexus.
How FBA Spreads Your Inventory Across States
- Inbound placement: when you create a shipment, Amazon may split it across several fulfillment centers in different states.
- Transfers: Amazon moves units between facilities to stay close to demand.
- Returns and removals: customer returns may be received and stored in yet another facility.
- Seasonal overflow: peak-season storage can place goods in states you never stocked before.
Many sellers end up with inventory in a large share of the states that have a sales tax. Some states, including California, have historically contacted FBA sellers about registration because their inventory was stored in the state.
How to Find Where Your Inventory Is Stored
- In Seller Central, open the Inventory Ledger report in its detailed view, which records inventory events by fulfillment center code.
- Export at least the last 12 months, plus prior years if you are assessing past exposure.
- Map each fulfillment center code to its state using a current FC location list.
- Record the first and last dates you had inventory in each state.
- Repeat for any 3PL, Walmart Fulfillment Services or other warehouses, using their location reports.
Keep this record. If a state asks when your nexus began, the answer comes from these dates.
What Marketplace Facilitator Laws Do and Do Not Cover
| Situation | Who collects sales tax | Your action |
|---|---|---|
| Order placed on Amazon, fulfilled by FBA | Amazon, as marketplace facilitator | Keep Amazon’s tax reports; report the sales on returns if the state requires it |
| Order on your Shopify or WooCommerce site, fulfilled by Amazon MCF | You | Collect tax in every state where you have nexus, including inventory states |
| Wholesale or B2B orders shipped from FBA or a 3PL | You | Collect tax or keep resale and exemption certificates |
| Orders on other marketplaces, such as Walmart or Etsy | That marketplace | Keep its reports for reconciliation |
| Registration in an inventory state | Not applicable | Some states require marketplace-only sellers with inventory to register; others do not |
For the full division of responsibilities, see our Amazon FBA sales tax guide and how to reconcile marketplace vs direct sales.
Worked Example: A Shopify Store With FBA Inventory in Texas
Example: a seller sells on Amazon and on its own Shopify site, using MCF to ship website orders
Amazon places part of the seller’s inventory in a Texas fulfillment center
Shopify sales into Texas this year: $60,000, well below Texas’s $500,000 economic nexus threshold
Because of the stored inventory, the seller has physical nexus in Texas and must collect on the Shopify orders
Texas rate: 6.25% state plus up to 2% local, so up to 8.25% combined
Tax at the 8.25% maximum: $60,000 × 8.25% = $4,950 that should have been collected from customers
If the seller relies only on economic nexus thresholds, it will miss this liability entirely. Check the combined rate for each customer address with the Sales Tax Calculator.
Physical Nexus Traps Beyond Sales Tax
| Trap | What it means |
|---|---|
| Income and franchise taxes | Inventory in a state may create nexus for state income or franchise tax, which marketplace laws do not cover |
| Gross receipts taxes | States such as Washington impose a business and occupation (B&O) tax on gross receipts that is separate from sales tax |
| Inventory property tax | Some states and localities tax business personal property, which can include inventory held on a valuation date |
| Nexus start date | Physical nexus starts when the inventory arrives, not when you cross a sales threshold, so exposure can predate your registration |
| Lingering nexus | Some states treat nexus as continuing for a period after your inventory leaves |
A Practical Action Plan for FBA and 3PL Sellers
- Map your inventory footprint from Amazon and 3PL reports, by state and date.
- List your direct channels: website, MCF, wholesale, trade shows and other marketplaces.
- Register where needed in inventory states where you make direct sales, or where the state requires marketplace sellers with inventory to register. See how to get a sales tax permit.
- Turn on tax collection in your storefront for every state where you have nexus, physical or economic.
- Review past exposure. If you had inventory and direct sales in a state before registering, consider whether a voluntary disclosure agreement makes sense.
- Check other taxes with a tax advisor, including income, franchise and property taxes in inventory states.
- Repeat quarterly, because your footprint changes as inventory moves.
Conclusion
FBA warehouse physical nexus sales tax rules catch sellers who only watch sales thresholds. Inventory in a state usually creates nexus on day one, Amazon’s placement decides where that happens, and marketplace facilitator laws only cover Amazon orders. Map your inventory, collect tax on direct and MCF orders into those states, and review the footprint every quarter. Explore rates on our state sales tax pages, back out tax from inclusive prices with the Reverse Sales Tax Calculator, and find more guides on the Tax Rate Center homepage.
Frequently Asked Questions
Does storing inventory in an Amazon FBA warehouse create sales tax nexus?
Generally yes. Inventory you own that is stored in a state is a form of physical presence, so most states treat it as creating nexus, with no minimum sales threshold.
If Amazon collects sales tax, do I still need to worry about FBA nexus?
Yes, if you sell through any other channel. Amazon collects only on Amazon orders. Website, wholesale and Multi-Channel Fulfillment orders into a state where you have inventory are your responsibility.
How do I find out which states hold my FBA inventory?
Use Seller Central’s Inventory Ledger report in its detailed view, which shows inventory events by fulfillment center code, then map each code to its state.
Do I need to register in every state where Amazon stores my inventory?
Not always. Some states require marketplace-only sellers with inventory to register, while others relieve them. If you make direct sales into an inventory state, you generally need to register and collect.
Does a 3PL warehouse create nexus the same way FBA does?
Yes. Inventory in any third-party warehouse, such as a 3PL or Walmart Fulfillment Services facility, is your property in that state and can create physical nexus.