Amazon FBA Inventory Creates Physical Nexus: What Happens When You're Also Below the $100K Economic Threshold in That State

Physical Nexus vs. Economic Nexus: Two Separate Triggers

Every state with a sales tax has two independent paths to establishing nexus: physical presence and economic activity. These are not alternatives — they are parallel systems. Meeting either one creates a tax obligation.

Economic nexus is the one most sellers know about. After the 2018 South Dakota v. Wayfair decision, states adopted revenue and/or transaction thresholds — typically $100,000 in sales or 200 transactions — that trigger a collection obligation for remote sellers. If you sell below those thresholds, economic nexus doesn't apply.

Physical nexus predates Wayfair by decades. It's the original nexus standard from the 1992 Quill Corp. v. North Dakota ruling: if you have tangible physical presence in a state — property, employees, inventory, or equipment — you have nexus. Period. There is no minimum dollar amount. There is no transaction threshold. There is no lookback window. One unit of inventory stored in a state warehouse on one day of the year can be enough.

This distinction is critical for Amazon FBA sellers. You might be comfortably below the $100,000 economic nexus threshold in a state, but if Amazon placed your inventory in a fulfillment center there, you have physical nexus through stored property. The economic threshold is irrelevant — you owe the state a registration and sales tax collection from dollar one of sales into that state.

Why FBA Inventory Counts as Physical Presence

When you enroll in Fulfillment by Amazon, you ship your inventory to Amazon's network. Amazon then distributes that inventory across its fulfillment centers based on demand forecasting, delivery speed optimization, and warehouse capacity. You don't choose which states receive your products — Amazon's algorithms do.

From a tax perspective, it doesn't matter that you didn't intend to place inventory in a particular state. The inventory is your property. Amazon is storing it on your behalf as a third-party logistics provider. Multiple states have issued formal guidance confirming this:

• Pennsylvania: The PA Department of Revenue explicitly states that inventory stored in a third-party warehouse — including Amazon fulfillment centers — constitutes physical presence and creates nexus
• California: The CDTFA considers inventory held by a third party in California to be sufficient physical presence for sales tax nexus
• Texas: The Comptroller treats any tangible personal property stored in Texas as establishing nexus, regardless of who owns the warehouse
• Washington: The DOR's physical nexus standard includes inventory stored in the state by any arrangement, including FBA
• New Jersey: The Division of Taxation considers inventory stored in the state a nexus-creating activity, even when managed by a marketplace facilitator

The legal principle is straightforward: your inventory is your tangible personal property. Storing it in a state — regardless of who manages the warehouse — gives you a physical footprint there. That footprint creates nexus.

Worked Example: $60K Seller with FBA Inventory in Pennsylvania

Let's walk through a concrete scenario that illustrates how physical nexus works independently of economic nexus.

States Where FBA Sellers Are Most Frequently Surprised

Amazon operates fulfillment centers in over 25 states, but five states consistently catch FBA sellers off guard due to a combination of large fulfillment networks, active enforcement, and clear physical nexus guidance.

Texas and California are particularly dangerous because their economic nexus thresholds are $500,000 — five times higher than the typical $100,000 threshold. A seller doing $200,000 in California sales might assume they have no obligation, while Amazon has been storing their inventory in fulfillment centers across the state the entire time.

Registration When Physical Nexus Exists but Economic Nexus Does Not

The registration process is identical whether you have physical nexus, economic nexus, or both. The state doesn't issue a different type of permit for physical-nexus-only sellers. You apply for the same sales tax permit, receive the same filing assignments, and have the same collection obligations.

What does differ is the practical situation:

• Lower liability, same deadlines: A seller with $60,000 in state sales has lower tax liability than one with $300,000 — but the filing deadlines, return requirements, and penalty structures are the same. In Pennsylvania, $60,000 in taxable sales generates roughly $3,600 in annual liability ($300/month), which would place you in quarterly filing.
• Multi-channel complexity: If Amazon is already collecting tax as a marketplace facilitator on your Amazon sales, you only need to collect tax on non-marketplace sales (your own website, other channels). But you still must file returns reporting all sales and the tax Amazon collected on your behalf.
• Voluntary disclosure may be available: If you've had FBA inventory in a state for months or years without registering, most states offer voluntary disclosure agreements (VDAs) that can limit your lookback period and waive penalties. Contact the state's tax department or work with a sales tax professional before registering to explore this option.

The key point: being below the economic nexus threshold does not exempt you from registration when physical nexus exists through FBA inventory. The registration form typically asks whether you have physical presence, economic nexus, or both — check physical presence even if your revenue is well under $100,000.

How to Use Amazon's Inventory Placement Reports to Map Your Physical Footprint

You cannot manage physical nexus obligations without knowing where your inventory sits. Amazon provides several reports that reveal your inventory's geographic distribution. Here's how to use them.

Step 1: Pull the Inventory Event Detail Report

In Seller Central, navigate to Reports → Fulfillment → Inventory Event Detail. This report logs every inventory movement — receipts, transfers, shipments, removals — and includes the fulfillment center code for each event. Download the report for the trailing 12 months.

Step 2: Extract Unique Fulfillment Center Codes

Filter the report to identify every unique fulfillment center code where your inventory has been stored. Amazon uses codes like AVP1 (Hazleton, PA), MDT2 (Carlisle, PA), TPA1 (Ruskin, FL), and BNA3 (Lebanon, TN). A spreadsheet pivot table makes this quick.

Step 3: Map Codes to States

Cross-reference each fulfillment center code with the state where it's located. Amazon does not publish an official public directory, but the information is widely available from third-party tax compliance services and FBA seller communities. The first three characters of the code often (but not always) correspond to the nearest airport code, which indicates the state.

Step 4: Build Your Nexus Exposure Map

Create a simple spreadsheet with three columns: state, fulfillment center code, and whether you have active inventory there now. Any state with current or recent inventory storage is a state where you likely have (or had) physical nexus. Compare this against your list of registered states — any gap is a compliance risk.

Step 5: Set a Quarterly Review Cadence

Amazon redistributes inventory regularly. A fulfillment center that held your stock last quarter may not hold it this quarter, and new locations may appear. Review your inventory reports at least quarterly to catch changes in your physical nexus footprint before they become compliance problems.

What Happens If You Don't Register

Ignoring physical nexus from FBA inventory doesn't make the obligation go away. States are increasingly sophisticated at identifying FBA sellers with nexus, using data-sharing agreements with Amazon, third-party data analytics, and cross-referencing marketplace facilitator reports with registration databases.

If a state identifies you as having nexus without being registered, the consequences typically include:

• Back taxes: The state can assess tax on all sales made into the state from the date nexus was established — which could be the first day Amazon placed inventory there
• Interest: Most states charge 6-12% annual interest on unpaid tax from the original due date
• Penalties: Late-filing penalties (typically 5% per month up to 25%), failure-to-register penalties, and in some states, fraud penalties if the state determines willful non-compliance
• Audit risk: Once a state opens a nexus inquiry, it often expands into a full audit covering all tax periods where nexus existed

Voluntary disclosure is almost always the better path. Most states offer VDA programs that limit the lookback period (typically 3-4 years instead of the full statute of limitations) and waive penalties in exchange for voluntary registration and payment of back taxes plus interest. Contact the state's revenue department or use the Multistate Tax Commission's voluntary disclosure program to begin the process.