A brand adds a warehouse to cut delivery times. Operations signs the contract, inventory arrives, and orders start shipping. Finance finds out later that the new location may also have created a sales tax obligation.
The same gap can appear when a third-party logistics provider (3PL) moves stock between facilities or a marketplace redistributes inventory across its fulfillment network. Your business can gain a presence in a state without opening an office or hiring anyone there.
Inventory you own in another state can create physical presence there, even when your sales are below that state's economic threshold. The registration and collection requirements depend on the state, your fulfillment arrangement, and how you sell.
That is why logistics decisions are tax decisions. Before moving stock, finance needs to know where it will go, when it will arrive, and which channels it will serve. For the rest of the picture across channels, see our ecommerce sales tax guide.
How inventory creates sales tax exposure
Nexus is the legal term for the connection between your business and a state that allows the state to impose tax obligations. We call it exposure, because that is what it is to your P&L. For ecommerce brands, two common sources are:
- Economic presence: Your sales into a state meet its economic threshold criteria.
- Physical presence: Your business has a physical connection to a state, which can include inventory stored there.
You do not need to own or lease the warehouse for your inventory to matter. Goods held by a 3PL or fulfillment provider can create that connection.
For example, California generally requires retailers storing inventory in the state to register and collect or pay applicable tax on sales delivered to California customers. That includes inventory in a third-party fulfillment center. Qualifying marketplace-only sellers can receive registration relief.
The practical distinction is between establishing exposure, registering, and collecting tax on particular sales. Those are related questions, but the answer to one does not automatically settle the others. A small amount of inventory should prompt a review even when your sales dashboard shows that you are below an economic threshold.
What to check before using a 3PL
With a single-site 3PL, start with the facility's state and your planned inbound date. Have finance or your tax adviser determine whether the arrangement creates a new obligation and complete any required registration before the applicable collection start date.
Distributed networks need an additional check. Your contract may allow the provider to rebalance inventory between facilities, use overflow storage, or introduce subcontracted locations. Each move can add another state to your tax footprint.
Ask for advance notice of new locations and an exportable history of where your inventory has been. A current stock snapshot can miss a facility that held your goods earlier in the year.
Before launch, review your checkout settings as well as your registrations. Warehouse location can affect the tax rate that applies. For example, Illinois distinguishes sales fulfilled from Illinois inventory from certain sales fulfilled from outside the state.
If you already operate in the state, check whether the new facility requires an account update or other changes. Do not assume every additional warehouse requires a separate state registration.
Seven questions to answer before signing a 3PL contract
Use the first six questions with the provider. Resolve the seventh internally before the first shipment.
- Which facilities and states could hold our inventory? Include overflow warehouses and subcontracted locations, as well as the initial facility.
- Will you notify us before moving inventory into a new state? Ask what notice is available, how far in advance it arrives, and who receives it.
- Can we export inventory location history? Request facility addresses, states, receipt dates, transfer dates, and enough detail to establish when stock was present.
- Can we restrict placement in particular states? Confirm whether that option exists and how it affects service levels and pricing.
- What triggers transfers between facilities? Understand whether movements happen automatically and whether seasonal demand changes the process.
- How long are records available, including after we leave the service? Arrange your own exports and a retention policy suited to your tax requirements.
- Who owns the finance review? Name the person responsible for reviewing location changes, assessing obligations, and coordinating registration and collection settings.
Make that review part of approving a new facility. Scheduled reports help detect changes, but advance notice gives finance time to act before stock arrives.
How Amazon FBA and Walmart WFS change the picture
Amazon's Fulfillment by Amazon (FBA) and Walmart Fulfillment Services (WFS) use networks of fulfillment centers. The facility receiving an inbound shipment may not be the only place your goods are stored.
Walmart explicitly describes moving inventory between fulfillment centers through Merchandise Transfer Requests. Transfers can support faster delivery or changes to its operations. Amazon's inventory reporting likewise tracks movements into and out of fulfillment centers.
Marketplace tax collection and inventory placement need separate attention. A marketplace may collect and remit tax on the transactions it facilitates, while your brand still has obligations for sales made through its own website. Our guide to marketplace facilitator laws by state covers what the marketplace collects and what you still owe.
For example, inventory stored in California can create obligations for taxable sales delivered to California customers through your own store. Amazon's handling of tax on Amazon orders does not resolve the treatment of those direct sales. Other states have different rules, including the exceptions below.
How to find out where your inventory has been
Amazon FBA: Use the Inventory Ledger report in Seller Central to review inventory activity. Work from the detailed event history and fulfillment-center information, rather than relying only on current balances. Amazon's Inventory Ledger announcement links to its report instructions.
Walmart WFS: Use the Inventory Reconciliation Report to review inventory movements. Walmart's transfer guidance explains the transfer and receipt columns. Where a report does not identify the physical location clearly, obtain the facility details from the provider.
Other 3PLs: Request transaction-level location history showing receipts and transfers, including facilities that no longer hold your stock.
For each provider, match facility identifiers to confirmed addresses and states. Do not infer the state from a code alone.
A useful monthly process is to export the records, flag newly appearing states, compare them with existing registrations, and document the review. Preserve the underlying files so the team can reconstruct historical activity after a platform's reporting window closes. For networks that move stock frequently, use more frequent reporting or alerts alongside the monthly review.
State exceptions depend on the fulfillment arrangement
Inventory does not produce the same result everywhere. Some states exclude qualifying fulfillment arrangements from physical presence; others relieve certain marketplace sellers of registration or collection duties.
Three examples show why the details matter:
- Illinois: Inventory used exclusively to fulfill marketplace orders does not create physical presence under the state's guidance. If that inventory also fulfills the seller's direct orders, the treatment changes. Separate direct sales can still cross the economic threshold.
- New York: Qualifying services from an unaffiliated fulfillment provider, including inventory storage, do not by themselves require registration when the seller is not otherwise required to register. This exclusion is not limited to marketplace-only sellers.
- Texas: Qualifying remote sellers below the $500,000 safe harbor may have no permit or collection obligation when their only physical presence is temporary inventory at a marketplace provider's facility and the provider has made the required certification. Texas separately identifies potential franchise tax responsibility for taxable entities with that inventory.
Review the actual arrangement: who owns the goods, who controls storage, which orders the inventory fulfills, and what other activity the business has in the state. Selling through your own website does not automatically eliminate every fulfillment exception.
Seasonal and temporary storage need a tax review
Peak-season planning can introduce locations that are easy to overlook: a short-term overflow warehouse, an additional 3PL facility, or stock positioned closer to customers for holiday delivery. Our peak season sales tax checklist covers the rest of holiday preparation.
Include temporary locations in the same review as permanent ones. A short contract should not be treated as evidence that no tax obligation arises. Record the first arrival and final removal dates, and establish any required registration and collection steps before the location goes live.
When the inventory leaves, review whether the obligation continues because of sales or other activity in the state. Confirm any required final returns, account changes, or closure process before stopping filings. Removing stock and closing a tax account are separate actions.
Dropshipping and supplier-held inventory
If a supplier ships directly to your customer, first establish when ownership of the goods transfers under your agreement. The party handling fulfillment is not necessarily the party that owns the inventory.
Supplier-owned stock should not automatically be treated as your inventory. Equally, goods you own can remain relevant to exposure while sitting in someone else's warehouse.
Dropshipping also raises questions about resale certificates and the tax treatment of the supplier's sale to your business. New York's dropshipping guidance, for example, distinguishes that transaction from your sale to the customer. Review ownership, certificates, and other state activity together.
What to do when you discover inventory in an unregistered state
Finding stock in a new state is a reason to investigate promptly. Start by establishing the facts and the available compliance options.
- Reconstruct the timeline. Gather facility records, arrival and transfer dates, sales by channel, marketplace tax documentation, and existing registrations. Identify when inventory first appeared and whether another activity may have created an earlier obligation.
- Assess the obligation and voluntary disclosure options before registering. Have a tax adviser review the state's rules, any applicable relief, and potential historical liability. Registration or contact with a state can affect voluntary disclosure eligibility. Alabama's program, for example, explicitly includes prior registration among its disqualifying conditions. A voluntary disclosure agreement may limit the historical periods covered and provide penalty relief. Eligibility and terms vary, and unpaid tax and interest may remain due. The Multistate Tax Commission's program coordinates applications with participating states and generally places the agreement before registration and back filings.
- Implement the appropriate resolution. Complete the required disclosure or registration process, address historical periods, and configure ongoing collection and filing. Use dates supported by the facts and the applicable process.
Then fix the operational gap. Assign ownership of location reporting and make sure future transfers reach finance early enough to review.
Frequently asked questions
Does inventory in a warehouse create sales tax nexus?
Usually. Inventory you own in a state creates physical presence in most states from the day it arrives, even when your sales are below the economic threshold. Illinois, New York, and Texas carve out some fulfillment arrangements. Registration and collection requirements depend on the state and the fulfillment arrangement, including any applicable marketplace relief.
Does Amazon FBA create sales tax obligations beyond Amazon orders?
Yes, for your own-store sales into the state where the inventory sits, unless a state exception applies. Check both where your stock is held and which channels you sell through; marketplace collection does not resolve every obligation for your own store.
Do I need to register if I have inventory but no sales in a state?
Often, yes. Review the state's rules and any fulfillment or marketplace exceptions. If registration is required, follow the assigned filing requirements even during periods with no tax due.
Can I stop filing when my inventory leaves?
Not automatically. Confirm whether your business still has an obligation in the state and what account closure or final filing steps apply.
How often should finance review inventory locations?
Review planned new locations before shipments begin, then check location history on a regular schedule. Monthly review is a practical starting point; frequent transfers may call for alerts or more frequent checks.
Manage sales tax as your fulfillment network grows
A new warehouse can improve delivery times and support growth. When finance sees that decision early, the business can prepare for the tax obligations that may follow.
Anrok runs exposure monitoring, registration, filing, and remittance for ecommerce brands on one platform, including reconciliation, which no other tax engine has built in. Anrok's tax experts are on hand when a new warehouse or channel changes the picture.
If you are adding a 3PL, expanding your fulfillment network, or reviewing existing inventory locations, book a demo to discuss how Anrok can support your sales tax compliance.
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