Economic nexus catches a lot of growing sellers off guard: once your sales to customers in a state cross that state’s threshold, it can require you to register and collect sales tax there — even if you’ve never opened a store, rented a warehouse, or set foot in the state yourself. Many sellers only find out after a letter arrives from that state’s tax office asking why they haven’t registered.

We see this often enough with our own ecommerce fulfillment clients that we wanted an answer for it. That’s why we decided to partner with Yonda Tax, a company that handles sales tax and VAT compliance. Yonda watches for new nexus, registers you in new states, files your returns, and sends your payments. Plus, you get a dedicated account manager who assists you along the way, rather than leaving you to set up their software on your own.

This article explains what nexus means for a fulfillment client and what Yonda Tax does to help ecommerce clients untangle the complexities of sales tax compliance.

What nexus actually means once your inventory is warehoused

“Nexus” is the legal threshold that determines whether a state can require you to collect and remit its sales tax. There are two ways to trip it:

• Economic nexus: you cross a sales or transaction threshold in a state, regardless of physical presence. Since the South Dakota v. Wayfair Supreme Court decision, most states enforce some version of this, commonly built around figures like $100,000 in sales or 200 transactions. (The full case history is a law-school reading assignment on its own; we’re keeping this to what changes your filing obligations.) The exact numbers and thresholds vary considerably from state to state, so treat any single figure as a rough starting point.
• Physical nexus: you have a physical presence in the state. Inventory sitting in a warehouse counts, even if you never set foot there yourself. Every EFS client has this in Michigan already, since your inventory sits in our warehouse there — registering and collecting tax on Michigan sales is a baseline compliance step, not something that only kicks in with a second warehouse.

Every EFS client starts with one confirmed physical nexus: Michigan, where your inventory is warehoused. That obligation doesn’t depend on your sales volume — it’s created the moment your goods sit on our shelves. From there, economic nexus is what varies and is worth watching closest, since it tracks your sales rather than your warehouse footprint and can create obligations in states you’ve never shipped from. Physical nexus can expand further if your own setup includes more than one fulfillment location. Either way, you can end up with a taxable presence in a state without realizing it.

The problem compounds because nobody tells you when it happens. There’s no notification when your sales cross a state’s threshold, or when inventory crosses a state line into a new fulfillment center. The first signal is often a letter from that state’s department of revenue, months or years after the obligation started, sometimes with penalties and interest already attached.

Why we partnered with Yonda Tax

A few things about Yonda stood out to us:

• It’s built around the exact scenario our clients face. Yonda’s platform monitors nexus thresholds automatically and flags new obligations before they become penalties, whether the exposure comes from sales volume or from a client adding a second fulfillment location somewhere down the line.
• It’s a managed service. A dedicated account manager runs the day-to-day work, so you’re not left configuring a dashboard and tracking a compliance calendar yourself.
• It covers more than US sales tax. Yonda manages US Sales Tax, UK and EU VAT, and Canadian and Australian GST from one platform, which helps for clients who ship internationally or are starting to.

Multi-state tax law is still complicated on its own. What changes is who’s tracking it. If you’re already using a software-only tool and it’s filing correctly for every state you owe in, that’s fine too. This is worth a look mainly when you’re not confident that’s the case.

What Yonda Tax actually does

Yonda’s service breaks down into four pieces:

• Nexus monitoring. The platform tracks where your inventory sits and where your sales are landing, and flags the moment either one crosses a threshold that creates a new filing obligation.
• Registration. Once a new obligation is identified, Yonda handles the state registration paperwork rather than leaving you to research each state’s process individually.
• Calculation and filing. Sales tax is calculated and filed, with remittance submitted on the applicable schedule for every state you’re registered in.
• A single point of contact. One dashboard and one account manager are accountable for every deadline, across every state you’re registered in.

Yonda also integrates with Shopify and the other ecommerce and accounting platforms our clients run, so it fits into what you’re already using.

Getting started: a free nexus audit

If you’re not sure whether your current fulfillment footprint has already created a nexus obligation you haven’t registered for, that’s the first thing worth finding out before a state tells you.

Not sure if you already have nexus somewhere?

Yonda Tax offers a free nexus consultation to review where your inventory and sales activity may have already created a filing obligation you don’t know about yet.