US LLC Sales Tax for Non-Resident Sellers: 2026 Nexus Guide

Many non-resident founders assume that because their LLC pays zero US federal income tax, they can ignore US taxes altogether. Federal income tax is administered by the Internal Revenue Service (IRS) and relies on concepts like effectively connected income (ECI) and trade or business status (ETBUS). If you run your company from abroad without US staff or real estate, your federal income tax liability is usually zero.

Sales tax is entirely separate. It is a state and municipal tax on the end consumer, collected by the merchant at the point of sale. Forty-five US states plus Washington D.C. impose a statewide sales tax, with rates ranging from 2.9% in Colorado to over 7% in California and Indiana, plus local city and county surcharges. If your business creates a legal connection, called nexus, with a state, that state requires you to collect sales tax on taxable goods delivered to buyers in that state.

Physical nexus is created when your business maintains any tangible footprint inside a state. For online sellers, the most common trigger is inventory storage. If you use a third-party logistics provider (3PL) in California, Texas, or Pennsylvania, your goods sitting in that warehouse instantly create physical nexus in that state.

Amazon FBA creates an identical issue. Amazon moves seller inventory across dozens of fulfillment centers nationwide to optimize prime shipping times. Once a single unit of your inventory lands in an Amazon warehouse in Tennessee, you legally have physical nexus in Tennessee. Unlike economic thresholds, physical nexus has no minimum sales limit. Even one unit stored in a warehouse can trigger registration obligations.

Following the 2018 Supreme Court ruling in South Dakota v. Wayfair, states can require remote sellers with zero physical presence to collect sales tax based solely on economic activity. Every state with a sales tax has adopted an economic nexus standard. These laws apply equally to foreign companies and non-resident LLC owners.

The most common threshold is $100,000 in gross annual sales or 200 separate transactions within the current or previous calendar year. A few states, such as California, Texas, and New York, use a higher revenue threshold of $500,000. In contrast, several states eliminated the 200-transaction count to reduce burdens on low-cost goods sellers, keeping only the $100,000 cap. Tracking your state-by-state sales volume is mandatory if you sell directly to US buyers through independent channels.

Marketplace facilitator legislation simplifies compliance for founders who sell exclusively on established platforms. In almost every state, platforms like Amazon, eBay, Walmart, and Etsy are legally required to calculate, collect, and remit sales tax on your behalf. If your non-resident LLC only sells through Amazon FBA, Amazon handles the collection and filing, which shields you from registering for sales tax permits in most states.

The situation changes completely if you sell through your own website, such as Shopify or WooCommerce. Shopify is a software provider, not a marketplace facilitator. You remain solely responsible for identifying where you have nexus, setting up automated tax collection through services like Stripe Tax or Shopify Tax, and submitting state returns. If you run both Amazon and Shopify channels, your Amazon sales still count toward your state economic nexus thresholds, even though Amazon remitted the tax on those specific transactions.

If your US LLC sells digital downloads, software subscriptions, or remote consulting, sales tax rules depend heavily on state-specific definitions. In states like Washington, New York, Pennsylvania, and Texas, software as a service (SaaS) and digital products are explicitly taxable. In California and Florida, customized digital services and pure SaaS often remain exempt unless bundled with tangible goods.

Because the digital taxation landscape changes frequently, software companies must configure automated geolocation tracking inside their billing stack. Tools like Stripe Tax or Quaderno detect customer billing addresses, evaluate local taxability, and apply the correct municipal tax rates automatically once you enable collection for a registered state.

When you purchase wholesale inventory from US manufacturers or suppliers, they are required to charge you sales tax unless you provide a valid resale certificate. A resale certificate proves to the vendor that you intend to resell the items to consumers who will ultimately pay the sales tax.

To issue a resale certificate, your LLC generally needs a sales tax permit from the state where the transaction occurs or from your home state of formation. Some states accept out-of-state resale certificates or universal documents like the Multistate Tax Commission (MTC) exemption certificate. Registering your LLC in Wyoming or Delaware lets you obtain a state tax identification number, which allows non-resident founders to purchase inventory tax-free from US distributors.

Registering for a sales tax permit requires submitting an application directly to each state department of revenue. Most states do not charge for a permit, but states like California require security deposits from foreign businesses, and Texas charges no fee. Because non-resident founders lack an SSN, some states require submitting paper forms with your foreign passport and your LLC EIN rather than using instant online portals.

Filing frequencies depend on your sales volume. States assign monthly, quarterly, or annual filing deadlines. Even if you made zero taxable sales in a registered state during a quarter, you must file a zero return to avoid automatic penalties, which usually start at $50 per late filing. Automated compliance platforms charge between $20 and $50 per state return filed. If managing multi-state registrations feels overwhelming, Bastion Formations can help set up your company structure and connect you with qualified sales tax specialists.