How do I manage sales tax nexus when Amazon moves my FBA inventory to new states?

Amazon treats FBA inventory as part of its fulfillment network, redistributing it between fulfillment centers to optimize delivery speed. From a sales tax perspective, every new state where Amazon places your inventory is a new physical nexus state, effective immediately. Managing FBA nexus means actively monitoring where your inventory is and responding to changes quickly.

How FBA inventory placement works

When you send inventory to FBA, you’re handing it to Amazon’s fulfillment network. Amazon’s algorithms determine where goods are stored and redistributed based on proximity to demand, warehouse capacity, and their own optimization criteria. The FBA terms of service give Amazon broad authority to move your inventory throughout the network.

For sales tax purposes, this means:

• Your nexus footprint is wherever Amazon places your inventory
• You don’t need to take any action to create nexus — Amazon creates it by moving goods
• You may have nexus in more states than you initially shipped inventory to

Where to find your current FBA nexus states

Seller Central → Reports → Fulfillment → Inventory → Inventory by State

This report shows a current snapshot of where Amazon holds your FBA inventory. It lists the quantity of units in each state and is updated regularly. This is your authoritative source for knowing where you currently have FBA-created physical nexus.

Run this report:

• When you first enable FBA or ship new products
• Monthly as part of your ongoing compliance review
• Any time you significantly expand your product catalog or sales volume (Amazon may redistribute more aggressively)

Responding to a new-state inventory placement

When you see inventory in a state you weren’t previously registered in:

1. Note the approximate date inventory arrived. Your nexus and collection obligation started when inventory arrived in that state. The Inventory by State report doesn’t show a history of when inventory first entered a state, if you’ve been running this report regularly, compare to your prior month’s report. If you haven’t, you may need to use other data points to estimate the start date.

2. Register in the new state. Start registration immediately. Most states process in 1–4 weeks; California can take 4–8 weeks. Your collection obligation exists from the inventory arrival date, not from your registration date.

3. Configure your sales channels to collect. Update Shopify, WooCommerce, your tax software, and any other channels to collect in the new state. This should be live as quickly as possible after registration is confirmed.

4. Address the gap period. If there’s a period between when inventory arrived (nexus start) and when your registration is active (ability to collect), that period represents uncollected tax liability on sales into that state. For short gaps, remit that tax with your first filing. For longer gaps, consider whether a VDA is the better resolution path.

Restricting FBA inventory placement

Amazon gives sellers two options for controlling inventory placement:

FBA Inventory Placement Service: Pay a per-unit fee to have inventory distributed from a single inbound location. This reduces the number of states where Amazon stores your goods but doesn’t guarantee inventory won’t move after receiving.

State restrictions via fulfillment settings: Some sellers explicitly restrict specific states from their FBA inventory placement through their Seller Central fulfillment settings. This limits geographic coverage of FBA but prevents nexus from being created in restricted states.

Both options involve trade-offs between tax compliance simplicity and fulfillment performance. Sellers with very lean operations in specific states sometimes choose to restrict placement rather than manage ongoing compliance in those states.

What Amazon’s marketplace collection doesn’t solve here

Amazon collects and remits sales tax on Amazon platform sales in all 45 states. This is sometimes misread as “Amazon handles my sales tax.” It doesn’t — Amazon handles collection on Amazon transactions, but your FBA nexus creates obligations that extend beyond Amazon-channel sales.

If you also sell through your own website, Shopify store, or other channels, sales into your FBA-nexus states through those channels are your responsibility. The nexus is physical, it applies to all your sales into those states, not just Amazon sales.