Nexus is the connection between your business and a state that can give the state authority to require sales tax registration and collection. For dropshippers, nexus matters because it helps decide where you may need a seller's permit and which resale certificate a supplier may accept.

The short version: you do not automatically have nexus in every state where you ship an order, but you can create nexus through physical presence or sales volume.

Informational only. This article is not tax, accounting, or legal advice.

Physical nexus

Physical nexus comes from a real-world presence in a state. For ecommerce and dropshipping businesses, that can include:

  • An office, store, or home business location.
  • Inventory stored in a warehouse or fulfillment center.
  • Employees, contractors, or representatives.
  • Trade show activity or other in-state business activity, depending on the state.

For a new dropshipper, physical nexus often starts with the home state. It can expand if inventory is stored by a third-party fulfillment provider or if the business develops other in-state activity.

Economic nexus

Economic nexus is based on sales into a state, even without physical presence. After the U.S. Supreme Court's 2018 decision in South Dakota v. Wayfair, states broadly adopted remote-seller economic nexus rules.

Thresholds vary. Many states use a dollar-sales threshold, and some historically used a transaction-count threshold as well. Because thresholds and measurement periods differ, growing sellers should track sales by state instead of waiting until a supplier or tax filing problem appears.

Why dropshipping adds friction

A dropship order usually contains two sales:

  • Your supplier sells the product to you.
  • You sell the product to your customer.

If the supplier has a sales tax obligation in the ship-to state, the supplier may ask you for resale documentation before it agrees not to charge sales tax on the wholesale sale. That is where a resale certificate becomes practical, not just theoretical.

Some states and vendors accept multistate documentation. Others ask for a state-specific registration number or form. This is why dropshippers can run into paperwork issues even before they have crossed economic nexus thresholds everywhere they ship.

How nexus affects resale certificates

Use this working rule:

  • Where you have nexus, review whether you need to register for a seller's permit.
  • Where you are registered, use the permit details to complete resale certificates when buying inventory for resale.
  • Where a supplier asks for documentation, confirm which certificate the supplier and state will accept.
  • Where a state does not accept out-of-state documentation, expect a more state-specific process.

For the certificate side of the workflow, start with what is a resale certificate? and the MTC Uniform resale certificate.

What to track

Keep a simple record of:

  • Sales by ship-to state.
  • Inventory locations.
  • Supplier locations and supplier certificate requests.
  • States where you are registered.
  • Certificates sent to each vendor.
  • Renewal or refresh dates for certificates and permits.

Practical takeaway

Nexus tells you where sales tax registration may be required. Supplier documentation tells you what certificate you may need to buy tax-free. Dropshippers need to watch both, because the supplier-side resale certificate question can show up before the customer-side filing workflow feels mature.

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