Key Points
- Sales tax nexus is the legal connection between your business and a US state that requires you to collect and remit tax.
- There are two main types: physical nexus (warehouse, office, employees) and economic nexus (revenue or transaction thresholds).
- Every US state sets its own nexus thresholds — there's no single national rule.
- Shopify's nexus alert is a warning, not a compliance solution. It won't register you, file your returns, or pay your taxes.
- Ignoring nexus obligations can result in back taxes, heavy penalties, and serious business risk.
- The fix is simpler than you think — but it requires action.
Introduction
Your Shopify store is growing. Orders are coming in from across the United States and business is good. Then Shopify sends you a notification: you may have sales tax obligations in multiple states.
Sound familiar?
For most store owners, that message triggers one of two reactions — panic or a quiet tab-close hoping the problem disappears. Neither one serves you well. The reality is that sales tax nexus is one of the most misunderstood obligations in US eCommerce, and getting it wrong is increasingly hard to hide from. States are actively chasing non-compliant merchants, and Shopify is helping them do it.
The good news? Once you understand what nexus actually means — and where you stand — the path to compliance is straightforward. Let's break it down.
What Is Shopify Sales Tax Nexus?
Sales tax nexus is the legal term for a sufficient connection between your business and a US state that obligates you to collect and remit sales tax from customers in that state. Think of it as the point at which a state can say: "You're doing enough business here — you owe us."
In the US, sales tax is governed at the state level. There's no federal sales tax and no single set of rules. Each state decides what triggers nexus, what the thresholds are, and how businesses must comply. As a Shopify merchant, you could have nexus in multiple states simultaneously — without ever setting foot in any of them.
There are two main types of nexus every store owner needs to understand: physical and economic.
Physical Nexus: When Your Presence Triggers an Obligation
Physical nexus is the older, more traditional form. It's created when your business has a tangible presence in a state. This includes:
- A store, office, or warehouse
- Inventory stored at a third-party logistics (3PL) provider
- Employees or contractors working remotely in that state
- Attending trade shows or events in certain states
If you're using a fulfilment partner to store or ship your goods, you almost certainly have physical nexus in every state where that inventory sits — whether you know it or not. This is one of the most common surprises for growing Shopify brands.
Economic Nexus for Shopify Sellers: The Rule That Changed Everything
In 2018, the US Supreme Court ruling in South Dakota v. Wayfair changed the game entirely. States gained the ability to require out-of-state businesses to collect sales tax based purely on economic activity — no physical presence required.
This is economic nexus, and it applies to virtually every Shopify seller selling into the US.
Economic nexus is triggered when your sales into a state exceed a set threshold — typically $100,000 in revenue or 200 individual transactions in a calendar year. Once you cross that threshold, you're obligated to register for a sales tax permit in that state and start collecting tax from those customers.
Here's the catch: economic nexus thresholds vary by state. Some states only use a revenue threshold. Others use both revenue and transaction count. A handful have lower limits. Tracking these across 46 sales tax states is not something you should be doing manually.
Understanding Nexus Thresholds by State
There is no universal rule. That's the core challenge of US sales tax for Shopify merchants.
Most states use $100,000 in sales or 200 transactions as their economic nexus threshold, but there are exceptions. Kansas, for example, has no minimum threshold — any sale into the state could create nexus. Texas uses $500,000 in total revenue. California and New York apply the $500,000 threshold as well, but only based on revenue, not transaction count.
What this means in practice: as your Shopify store scales, you could be crossing new thresholds in new states without realising it. And the obligation is retroactive to the date you crossed the threshold — not the date you found out about it.
What the Shopify Nexus Alert Actually Means
If Shopify has flagged nexus activity in your account, that's Shopify telling you to pay attention — not that they're handling it for you. This is an important distinction.
Shopify Tax can show you where your sales are approaching or exceeding thresholds. It can automatically add sales tax at checkout once you're registered in a state. What it cannot do is register you for a sales tax permit, file your returns, or remit the tax you've collected to the relevant state authority.
That's still entirely your responsibility. And the longer you wait after receiving a nexus alert, the more back-taxes and penalties can accumulate.
Sales Tax Registration for Shopify Stores: What Comes Next
Once you've identified where you have nexus, you need to register for a sales tax permit in each of those states. Every state has its own registration process — forms, documentation requirements, and timelines vary. Some states are relatively straightforward. Others are not.
After registration, you'll need to configure Shopify to collect the correct tax rate at checkout, and then file returns on a schedule set by each state (monthly, quarterly, or annually). Those returns need to accurately account for your sales by jurisdiction, including any refunds, discounts, or tax-exempt transactions.
Miss a filing or underpay, and the state will notice. The enforcement infrastructure in the US is well-developed, and with platforms like Shopify feeding data to compliance systems, non-compliant merchants are easier to identify than ever.
The smartest move is to get ahead of it — register where you have nexus, start collecting correctly, and put the filing process on autopilot.
Frequently Asked Questions
1. Does Shopify automatically register me for sales tax when I hit a nexus threshold?
No. Shopify will alert you when your sales approach or exceed state thresholds, but it doesn't register you for a sales tax permit. That's a separate process you (or a tax service partner) need to handle in each state.
2. What happens if I've already crossed a nexus threshold but haven't registered?
You may owe back taxes from the date you crossed the threshold. Some states have voluntary disclosure programmes that allow businesses to come forward and settle outstanding obligations with reduced penalties. The sooner you act, the better your position.
3. Does nexus only apply to US-based sellers?
No. If you sell to customers in the United States — regardless of where your business is based — US sales tax law applies to you. International Shopify merchants are just as obligated as domestic ones once they exceed state thresholds.
4. Can I have nexus in a state just because my products are stored there?
Yes. Inventory stored at a 3PL warehouse creates physical nexus in that state, even if you have no other connection to it. This is a common and often overlooked trigger for Shopify brands using fulfilment services.
5. How do I know if Shopify's nexus analysis is accurate?
Shopify's analysis is based on your sales data and known state thresholds, but it isn't always definitive. Nexus rules are complex, and there are edge cases that automated tools can miss. A proper nexus review from a qualified tax professional is always the safer approach.
6. Do I need to register in every US state?
Only in states where you've triggered nexus — either physical or economic. You don't need a sales tax permit in states where you have no nexus and haven't exceeded any thresholds. As your business grows, however, that list can change quickly.
Running a Shopify store shouldn't mean running from your tax obligations. Yonda Tax handles nexus analysis, registration, filing, and remittance — so you can focus on building your business. Book a free consultation today.