Inventory is company property. Storage in a state can create physical presence even when Amazon or a 3PL selects the warehouse and the seller never visits. Marketplace collection does not erase the inventory fact.
1. Warehouse control is not inventory ownership
FBA and 3PL contracts may permit warehouse transfers, but ownership follows the contract, purchasing, risk and accounting facts. State guidance expressly treats stock held by a marketplace facilitator or third party as potential physical presence.
“Amazon did not notify us in advance” is therefore not a nexus conclusion. Obtain location reports, aging, transfer records and contract terms showing when goods entered, left or returned to a state. Retain the download date, seller account and fulfillment-code definitions. If one SKU moves among states, preserve its first and last dates by state rather than only a consolidated unit count.
2. Monthly locations matter more than year-end balance
Zero year-end inventory does not prove that no property existed during the year. Goods, samples, repair parts or returns held even briefly may affect a filing period. Reports should include fulfillment code, state, SKU, quantity, value and first-seen date.
Combine Amazon, Walmart, independent 3PL and owned-warehouse data, remove duplicates and retain lineage. When the ERP stores total inventory without state, supplement it from logistics systems. Reconcile beginning units plus receipts and transfers, less shipments, returns and disposals, to ending units each month. Escalate negative inventory or unexplained interstate movement instead of treating it as a tax-data adjustment.
- Warehouse code, address and state
- SKU, quantity, cost and ownership
- First arrival, interstate transfer and depletion dates
- Returns, damage, repair and consigned stock
- Platform, 3PL and ERP reconciliation
3. Inventory can trigger more than Sales Tax
Physical inventory commonly affects Sales Tax registration and can also prompt income, franchise, gross-receipts, foreign-qualification and other analyses. P.L. 86-272 should not be assumed when inventory is present in the state.
Record each tax separately. A facilitator may collect on marketplace sales while the seller still files because of inventory, direct sales or business-tax nexus. Another state may treat an exclusively facilitated seller differently. The matrix should show the legal trigger, filing entity, start date, return type and authoritative source for each conclusion, so marketplace collection never erases a separate business-tax requirement.
- Sales Tax permit and direct-channel collection
- State income tax and P.L. 86-272
- Franchise or gross-receipts tax
- Foreign qualification and annual reports
- Inventory accounting, insurance and unclaimed property
4. Build exposure from the first inventory date
The state timeline should show first inventory, marketplace and direct sales, permit date, collection deployment, first return and final depletion. Historical analysis uses period sales and marketplace collection—not today's balance as a proxy.
For missed periods, preserve data before comparing VDA, back filing and prospective registration. State contact, prior registration and collected-but-unremitted tax can change relief eligibility, so avoid a routine registration before the remedy is evaluated.
5. Make inventory-state changes a logistics control
Notify tax before adding a fulfillment provider, warehouse or transfer authority. At close, compare current and prior inventory states and route new-state exceptions to an owner.
Exit also needs evidence. Confirm inventory, returns, equipment and other activity ended before final returns and closure. Do not close an account merely because sales declined. Retain provider termination records, final location reports and system screenshots. Continue monitoring warehouse-held or in-transit returns before marking the state closed.
