US LLC Sales Tax for Non-Residents: Navigating Nexus in 2026

Many non-US founders confuse sales tax with income tax. They are distinct. Income tax is a federal and state levy on your LLC's profits, which for single-member LLCs typically passes through to the owner. Sales tax, however, is a consumption tax collected from the customer at the point of sale and then remitted to the state.

The US federal government does not impose a sales tax. Each of the 45 states with a sales tax sets its own rules, rates, and collection thresholds. This decentralized system is the primary reason sales tax compliance for a US LLC can be complex.

Sales tax nexus defines the sufficient connection your US LLC has with a state that obligates you to collect and remit sales tax there. If you have nexus in a state, you must register, collect sales tax from customers in that state, and then file returns.

In 2026, the concept of 'nexus' is primarily driven by two factors: physical presence and economic activity. Even if your US LLC has no physical office in the United States, economic nexus rules will likely apply to your operations.

Physical nexus refers to having a tangible presence in a state. For non-US founders, this can include an office, warehouse, or even an employee working from a particular state. Inventory stored in a third-party fulfillment center, like an Amazon FBA warehouse, also creates physical nexus in that state.

Even temporary activities, such as attending a trade show where you make sales or using a contractor on-site, can establish physical nexus. Review your operational footprint carefully to identify all states where your US LLC might have a physical presence.

Economic nexus applies to remote sellers who conduct a certain volume of sales into a state, even without physical presence. This standard, established by the South Dakota v. Wayfair Supreme Court decision, is now the norm across almost all states with a sales tax.

Each state sets its own economic nexus threshold. Common thresholds are $100,000 in gross sales or 200 separate transactions into the state in the current or previous calendar year. For example, if your US LLC sells $105,000 worth of goods to customers in New York in 2025, you would establish nexus there for 2026, regardless of your location.

Once your US LLC establishes nexus in a state, registration is the next mandatory step. You must register for a sales tax permit in each nexus state before collecting sales tax. Collecting without registration is illegal and can lead to significant penalties.

The registration process typically involves applying through the state's Department of Revenue website. You will need your LLC's EIN and business details. Some states may require additional verification or documentation. This process can be time-consuming, so plan accordingly once nexus is identified.

After registration, your US LLC must accurately collect sales tax from customers in your nexus states. Sales tax rates vary not only by state but often by county, city, and special districts. This requires precise tax calculations based on the customer's shipping address.

Sales tax returns are typically filed monthly, quarterly, or annually, depending on your sales volume in that state. You must then remit the collected tax to the state. Many companies use specialized sales tax software or services to automate these complex calculations and filings, which can cost $50 to $500 per month depending on volume and features. Failure to file or remit on time results in penalties and interest.

As a non-US founder, carefully choose your LLC's home state. While a state like Wyoming offers privacy, its sales tax rules will still apply if your LLC has nexus elsewhere. Consider using a professional registered agent service that understands sales tax mail notifications.

Regularly review your US LLC's sales data to monitor for economic nexus thresholds in new states. If your operations involve physical goods, understand where your inventory is stored, as this immediately creates physical nexus. Proper planning can help manage your sales tax burden and keep your US operations compliant.