Sales Tax Nexus After Wayfair: Do You Need to Collect in Every State?

<h2>The Wayfair Decision Changed Everything</h2>

<p>In June 2018, the U.S. Supreme Court's ruling in South Dakota v. Wayfair, Inc. fundamentally changed how states can require businesses to collect sales tax. Before Wayfair, a state could only require sales tax collection from businesses with a physical presence (like a store, warehouse, or employee) in that state. After Wayfair, states can impose sales tax collection obligations based on economic activity alone.</p>

<p>For small businesses, this ruling created a complex web of new obligations. If you sell products or services across state lines, whether through an online store, a marketplace, or direct sales, you may now have sales tax nexus in states where you have never set foot. Understanding where you have nexus and what to do about it is critical to avoiding penalties and back-tax assessments.</p>

<p>Not sure where you stand? <a href="/wizard">Take the free SMBRegs compliance quiz</a> to identify your sales tax obligations across all 50 states.</p>

<h2>What is Sales Tax Nexus?</h2>

<h3>Physical Nexus</h3>

<p>Physical nexus is the traditional standard. You have physical nexus in a state if you maintain any of the following there:</p>

<ul>

<li>An office, store, warehouse, or other place of business</li>

<li>Employees (including remote workers in some states)</li>

<li>Inventory stored in a warehouse or fulfillment center</li>

<li>Independent sales representatives or agents</li>

<li>Temporary physical presence at trade shows (varies by state)</li>

</ul>

<p>Physical nexus still applies. The Wayfair decision did not eliminate it. Instead, it added a second path to nexus: economic nexus.</p>

<h3>Economic Nexus</h3>

<p>Economic nexus is triggered when your sales into a state exceed certain thresholds, even without any physical presence. Since the Wayfair decision, every state with a sales tax (45 states plus Washington, D.C.) has adopted economic nexus laws. The most common threshold is $100,000 in sales or 200 transactions in a calendar year, but thresholds vary by state.</p>

<h2>State-by-State Economic Nexus Thresholds</h2>

<p>While most states adopted the South Dakota model ($100,000 in sales or 200 transactions), there are important variations:</p>

<ul>

<li><strong>Sales-only threshold states:</strong> Many states have dropped the transaction count test and use only a dollar threshold. California, Texas, and New York all use $500,000 in sales as their threshold.</li>

<li><strong>Lower thresholds:</strong> Some smaller states use thresholds as low as $100,000 in sales with no transaction test.</li>

<li><strong>Higher thresholds:</strong> California and Texas set their bar at $500,000, while New York also uses $500,000 combined with a 100-transaction minimum.</li>

<li><strong>Unique rules:</strong> Some states measure thresholds over the current or previous calendar year, while others use trailing 12-month periods.</li>

</ul>

<p>For detailed state-by-state requirements, explore our <a href="/compliance/california">California</a>, <a href="/compliance/texas">Texas</a>, and <a href="/compliance/new-york">New York</a> compliance pages.</p>

<h2>Marketplace Facilitator Laws</h2>

<h3>What They Mean for Sellers</h3>

<p>Nearly every state with a sales tax has enacted marketplace facilitator laws. These laws require marketplace platforms (like Amazon, Etsy, eBay, and Walmart Marketplace) to collect and remit sales tax on behalf of third-party sellers. If you sell exclusively through these platforms, the marketplace handles your sales tax obligations in most states.</p>

<p>However, there are important caveats:</p>

<ul>

<li>Sales through your own website or direct channels are not covered by marketplace facilitator laws</li>

<li>You may still need to register in states where the marketplace collects tax on your behalf (policies vary by state)</li>

<li>Not all platforms qualify as marketplace facilitators in every state</li>

<li>B2B sales and exempt transactions may require separate handling</li>

</ul>

<h3>Mixed-Channel Sellers</h3>

<p>If you sell through both marketplaces and your own channels, compliance gets more complex. You need to track your own-channel sales separately to determine economic nexus thresholds (some states exclude marketplace-facilitated sales from the threshold calculation, while others include all sales). This is where many small businesses make costly errors.</p>

<h2>How to Determine Your Nexus Footprint</h2>

<h3>Step 1: Map Your Physical Presence</h3>

<p>List every state where you have physical connections: offices, employees, remote workers, inventory, and contractors. Remember that using a third-party fulfillment center (like Amazon FBA) creates physical nexus in the state where that warehouse is located.</p>

<h3>Step 2: Analyze Sales by State</h3>

<p>Pull your sales data and break it down by customer state. Compare each state's total against that state's economic nexus threshold. Remember to check whether the state uses a calendar year, fiscal year, or trailing 12-month measurement period.</p>

<h3>Step 3: Register Where Required</h3>

<p>Once you identify states where you have nexus, you must register for a sales tax permit in each state before you begin collecting tax. Collecting sales tax without a valid permit is illegal in most states. Many states offer online registration through their department of revenue websites.</p>

<h3>Step 4: Implement Collection and Remittance</h3>

<p>After registration, you need systems to charge the correct tax rate (which varies by jurisdiction within each state), file returns on the required schedule (monthly, quarterly, or annually depending on your volume), and remit collected taxes by the due date.</p>

<h2>Common Nexus Mistakes to Avoid</h2>

<p>Small businesses frequently make these sales tax errors:</p>

<ul>

<li><strong>Ignoring nexus obligations:</strong> Many businesses assume they only need to collect sales tax in their home state. States are increasingly aggressive about identifying and pursuing non-compliant sellers.</li>

<li><strong>Forgetting about FBA inventory:</strong> If you use Amazon FBA, your inventory may be spread across warehouses in dozens of states, creating physical nexus in each one.</li>

<li><strong>Applying the wrong tax rate:</strong> Sales tax rates vary not just by state but by county, city, and special district. Using the wrong rate is a compliance violation.</li>

<li><strong>Missing filing deadlines:</strong> Late filings trigger penalties and interest in most states, even if the amount owed is zero.</li>

<li><strong>Not tracking exemption certificates:</strong> If you sell to tax-exempt buyers (like resellers or nonprofits), you must collect and retain valid exemption certificates.</li>

</ul>

<h2>Software and Automation Options</h2>

<p>Managing sales tax compliance across multiple states manually is nearly impossible for growing businesses. Several categories of tools can help:</p>

<ul>

<li><strong>Sales tax calculation services:</strong> Integrate with your shopping cart to automatically calculate the correct tax rate based on the customer's location</li>

<li><strong>Filing and remittance services:</strong> Prepare and submit your sales tax returns across all registered states</li>

<li><strong>Nexus monitoring tools:</strong> Track your sales by state and alert you when you approach economic nexus thresholds</li>

</ul>

<p>For more on leveraging technology for compliance, read our guide on <a href="/blog/compliance-automation-ai-small-business">compliance automation for small businesses</a>.</p>

<h2>What Happens If You Do Not Comply?</h2>

<p>States have powerful enforcement tools. If you have nexus and fail to register and collect sales tax, you may face back-tax assessments covering multiple years, penalties and interest on uncollected tax, personal liability for responsible individuals in some states, and being barred from doing business in the state. Many states also participate in information-sharing agreements, so an audit in one state can trigger audits in others.</p>

<h2>Get Your Sales Tax Compliance Roadmap</h2>

<p>Sales tax nexus is one of the most complex compliance areas for small businesses in 2026. The rules vary by state, change frequently, and carry significant penalties for non-compliance.</p>

<p><strong><a href="/wizard">Use the SMBRegs compliance wizard</a></strong> to identify every state where your business has sales tax nexus and get step-by-step guidance for registration and compliance. Our tool analyzes your business activities, sales channels, and locations to generate a personalized action plan.</p>

<p>Need to brush up on tax terminology? Visit the <a href="/glossary">compliance glossary</a> for clear definitions of nexus, economic nexus, marketplace facilitator, and other key terms.</p>