For e-commerce sellers and digital agencies, nexus is the most critical compliance hurdle of 2026. This foundational guide explains exactly when you are legally obligated to collect sales tax.
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In 2026, "Economic Nexus" is the law of the land. Following the South Dakota v. Wayfair decision, almost every state with a sales tax now requires out-of-state sellers to collect tax once they cross a specific revenue or transaction threshold.
Nexus is a "sufficient connection" between your business and a state that gives the state the legal right to require you to collect and remit sales tax. In 2026, this connection can be Physical (employees/inventory) or Economic (sales volume).
Many sellers assume they only have nexus where they have an office or employees. However, in 2026, inventory storage is one of the most common physical nexus triggers. If you use Amazon FBA or a 3PL, and your goods are stored in a warehouse in California or Pennsylvania, you likely have physical nexus in those states regardless of your sales volume.
| Nexus Type | Trigger Example | 2026 Compliance Status |
|---|---|---|
| Physical | Remote Employees, Inventory (FBA) | Mandatory Registration |
| Economic | > $100,000 in Annual Revenue | Mandatory Registration (Most States) |
While each state sets its own rules, 2026 has seen a major push toward simplification. Most states have now adopted a flat $100,000 gross revenue threshold. The "200 transaction" rule, once common, has been repealed in major jurisdictions like Illinois and Maine to protect small businesses from administrative burden.
See every state's combined rate at a glance on the US sales tax by state map.
Model your revenue across all 50 states to see where you may have crossed the 2026 economic threshold.
If you sell exclusively on Amazon, Etsy, or Walmart, these platforms are legally required to collect and remit tax on your behalf in most states. This is known as the Marketplace Facilitator Law. However, if you also sell on your own Shopify site, you must monitor your aggregate revenue to determine if you need to register and collect tax on your direct-to-consumer sales.
Establishing nexus without registering is a major audit risk. States use shipping data and payment processor reports (1099-K) to find unregistered sellers. If caught, you may be liable for back taxes, interest, and penalties spanning several years.
Once you have nexus, you must determine which rate to charge. In 2026, most states use Destination Sourcing, meaning the tax rate is based on where the customer is located, not where your business is based.
· Rates verified quarterly from the Tax Foundation and state Departments of Revenue.
All rates, thresholds, and regulatory guidance cited on this page are sourced from official government publications and non-partisan research institutions.
TaxesLedger is an independent educational tool. We are not affiliated with any government agency. Rates are verified quarterly; always confirm with your jurisdiction's official Department of Revenue before filing. Last verification: May 15, 2026.
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