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Amazon FBA and Sales Tax Nexus: Does Inventory in a Warehouse Trigger Nexus?

Taxero Team·9 min read

Amazon FBA and Sales Tax Nexus: Does Inventory in a Warehouse Trigger Nexus?

Last updated: April 2026 | Reading time: ~9 minutes

The short answer: Yes. Storing your inventory in an Amazon FBA warehouse creates physical nexus in that state — meaning you may owe sales tax there, even if you've never set foot in that state and have no idea Amazon put your products there.

This is one of the most misunderstood and most costly sales tax issues facing Amazon FBA sellers. Here's everything you need to know.

What Is Physical Nexus?

Sales tax nexus is the connection between you and a state that requires you to collect and remit sales tax from buyers in that state.

Physical nexus is the original kind. Before 2018, nexus required actual physical presence — an office, employees, a store, or a warehouse. If you had none of those in a state, you generally didn't owe sales tax there.

Physical nexus triggers include:

  • An office or place of business
  • Employees or contractors in the state
  • A warehouse or distribution center where your inventory is stored
  • A trade show or temporary sales event
  • Inventory stored in a third-party fulfillment center (like Amazon FBA)

That last one is the one that catches FBA sellers off guard.

The IRS and state tax authorities recognize that storing goods for sale in a location constitutes doing business there. When Amazon stores your inventory, they're storing it on your behalf — which creates nexus for you in that state under most states' laws.

How Amazon FBA Creates Nexus in Multiple States

Amazon operates over 200 fulfillment centers across the United States. When you send inventory into the FBA network, Amazon's algorithm distributes it to warehouses it chooses — based on projected demand, proximity to customers, and logistics efficiency.

You don't get to choose. Amazon might split your inventory across 10 states without asking. Each state where your inventory lands is a state where you now have physical nexus.

This has been the position of state taxing authorities for years. Amazon itself acknowledged this issue starting around 2012 when California threatened Amazon over its distribution centers.

States Most Aggressive About FBA Nexus

While most states technically create nexus through inventory storage, some are known for active enforcement:

  • California — Has pursued Amazon sellers aggressively; CDTFA cross-references FBA data
  • Texas — Comptroller actively audits out-of-state sellers with Texas warehouse activity
  • New York — Strong enforcement; nexus found through affiliate and inventory presence
  • Pennsylvania — Has sent nexus questionnaires to sellers identified through Amazon data
  • New Jersey — Active enforcement, particularly for sellers with significant NJ warehouse volume
  • Illinois — Nexus created through inventory; also has unique marketplace tax rules
  • Washington — State requires registration once nexus is established; audits sellers
  • Florida — Began collecting sales tax on remote sellers in 2021; enforcement increasing

Where Does Amazon Store Your FBA Inventory?

This is the critical question, and Amazon makes it harder than it should be.

Option 1: Inventory Placement Report (Best Method)

In Seller Central, go to: Reports → Fulfillment → Inventory → Inventory Event Detail

This report shows movement of your inventory in and out of specific warehouses. The warehouse codes correspond to Amazon facility locations.

You can also run a Manage Inventory Health report and filter by location.

Option 2: Amazon's Fulfillment Center List

Amazon publishes a list of its fulfillment center locations on its website and through third-party trackers. The warehouse code prefix tells you the state:

  • PHX = Arizona (Phoenix area)
  • ONT = California (Ontario/Inland Empire)
  • DFW = Texas (Dallas-Fort Worth area)
  • ATL = Georgia (Atlanta area)
  • MDW = Illinois (Chicago area)
  • BNA = Tennessee (Nashville area)

A complete, regularly updated list is maintained by third-party resources like TBIS (Tax By Amazon FBA Inventory States).

Option 3: Third-Party Tools

Sales tax software like Taxero can connect to your Amazon Seller Central account and automatically identify which states have your inventory, flag nexus, and track threshold crossing in real time.

What to Do If You Have Unexpected FBA Nexus

Finding out you have inventory — and therefore nexus — in states you didn't plan for is stressful. Here's the right sequence of actions:

Step 1: Get Clear on Your Exposure

Pull your FBA inventory reports for the past 3 years. Identify which states had your inventory and when. Calculate what your total sales were into those states during those periods.

This tells you: which states, for how long, and what amount.

Step 2: Determine If You Owe

If you had inventory in a state AND you made sales to customers in that state AND you were not collecting and remitting sales tax: you likely have a liability.

The amount is the unpaid tax on those sales — typically 5–10% of gross sales, depending on the state rate.

Step 3: Consider Voluntary Disclosure

Before you get a notice, consider proactively disclosing to states through their Voluntary Disclosure Agreement (VDA) programs.

Benefits of VDA:

  • Typically limits lookback period to 3 years (vs. potentially unlimited under audit)
  • Often waives or reduces penalties (not just interest)
  • You control the process — rather than a state auditor controlling it
  • Demonstrates good-faith compliance

The Multistate Tax Commission (MTC) runs a National Nexus Program that lets sellers apply for VDAs in multiple states simultaneously through one process.

Step 4: Register in Each State

Once you've addressed historical liability, register going forward. Each state has its own registration process:

For multiple states at once, use the Streamlined Sales Tax Registration System (SSTRS) at streamlinedsalestax.org. It covers 24 SST member states in one free registration.

Step 5: Set Up Collection and Filing

Once registered, configure your Amazon Seller Central to collect sales tax in your nexus states. Go to Settings → Tax Settings and enable collection for each state.

Then establish a filing calendar. Each state will assign you a filing frequency based on your volume:

  • Monthly — High-volume sellers
  • Quarterly — Medium-volume sellers
  • Annual — Low-volume sellers

Does Amazon Marketplace Facilitator Status Help?

This is where it gets nuanced.

Amazon became a marketplace facilitator in all U.S. states with sales tax by 2020. As a marketplace facilitator, Amazon collects and remits sales tax on your behalf for sales made through Amazon.com.

So Amazon collects the tax. Does that mean you're off the hook?

For the collection obligation, largely yes — Amazon remits the tax to the state, not you.

But for the nexus and registration obligation, no. Many states require you to register even if a marketplace facilitator collects the tax on your behalf. California is the most notable example — sellers who exceed $500,000 in California sales must register with the CDTFA regardless of marketplace facilitator status.

Additionally, if you sell through any channel other than Amazon (your own website, Whatnot, Etsy, etc.), you need to collect and remit tax on those sales in your nexus states. You can't rely on Amazon's marketplace facilitator status to cover off-Amazon sales.

FBA Nexus: State-by-State Quick Reference

| State | Physical Nexus Triggered by FBA? | Marketplace Facilitator Law? | Registration Required Even with MF? | |-------|-----------------------------------|------------------------------|--------------------------------------| | California | Yes | Yes | Yes (over $500K) | | Texas | Yes | Yes | Often yes | | New York | Yes | Yes | Yes | | Florida | Yes | Yes | Generally yes | | Pennsylvania | Yes | Yes | Check with PA DOR | | Illinois | Yes | Yes | Yes | | Washington | Yes | Yes | Yes | | Georgia | Yes | Yes | Generally yes | | New Jersey | Yes | Yes | Generally yes | | Tennessee | Yes | Yes | Generally yes |

This table is a general guide. Laws change. Always verify with the state DOR.

How Taxero Handles FBA Nexus

Taxero connects directly to your Amazon Seller Central account and:

  1. Scans your inventory placement across all FBA fulfillment centers
  2. Identifies your nexus states automatically, including states you didn't know about
  3. Tracks your sales by state to monitor economic nexus thresholds alongside physical nexus
  4. Alerts you before crossing thresholds so you can register proactively
  5. Files your returns automatically — monthly, quarterly, or annually based on your filing frequency

Sellers who discover FBA nexus issues often have exposure in 10–20 states. Managing that manually is a nightmare. Taxero automates it — Managed plan at $49.99/month, or Self-Serve at $19.99 per filing.

Start your free nexus assessment at taxero.ai →

Upload your FBA inventory report and we'll tell you exactly where you have nexus. No credit card needed to start.

Frequently Asked Questions

Q: Does storing inventory in an Amazon FBA warehouse always create nexus? A: In most states, yes. Physical possession of your inventory in a state — even by a third party — constitutes a form of physical presence that creates sales tax nexus. A small number of states have explicit exceptions for inventory in transit or in third-party warehouses, but these are the exception, not the rule. Assume nexus exists wherever Amazon has stored your inventory.

Q: Since Amazon collects sales tax as a marketplace facilitator, do I still need to register? A: Amazon collecting the tax and you being required to register are separate questions. In many states, including California and Washington, sellers with nexus must register regardless of whether a marketplace facilitator is collecting the tax. The registration requirement is about being in the system, not just about who sends the check.

Q: How far back can states go when auditing FBA nexus? A: It varies by state and circumstance. Most states have a 3-year statute of limitations for routine assessments. However, if the state can show you failed to file returns at all (not just filed incorrectly), some states can go back 5, 7, or even unlimited years. This is why Voluntary Disclosure Agreements — which typically cap lookback at 3 years — are valuable.

Q: I enrolled in FBA Inventory Placement Service to keep inventory in one warehouse. Does that limit my nexus? A: Amazon's Inventory Placement Service can help concentrate inventory in fewer warehouses, but Amazon can still redistribute inventory across its network when needed. Enrollment doesn't guarantee your inventory stays in one state. Continue monitoring your inventory placement reports.

Q: What's the penalty for not collecting sales tax in a state where I have FBA nexus? A: Penalties vary by state but typically include: (1) the unpaid tax itself, (2) interest (5–10% annually), and (3) a failure-to-file or failure-to-collect penalty (often 10–25% of unpaid tax). California, in particular, has strong enforcement. The longer you wait, the larger the exposure.

Q: Can I use the same sales tax permit for Amazon and other platforms? A: Yes. A sales tax permit in a state covers all your sales into that state, regardless of platform. Once you're registered in California, for example, your permit covers your Amazon, Etsy, and Whatnot sales in California. You just need one permit per state.

Q: Does Amazon provide documentation of where it stores my inventory? A: Yes, through Seller Central's inventory and fulfillment reports. The Inventory Event Detail report shows inventory movement by facility. You can also see your inventory placement by running a Monthly Storage report. Taxero automates this analysis when you connect your Seller Central account.

Primary Sources

This post is for informational purposes only and does not constitute tax advice. Consult a licensed CPA or tax attorney for advice specific to your situation. Tax laws change frequently; verify all information with the relevant state Department of Revenue.

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