Sales Tax for an E-commerce LLC: Nexus, Marketplaces, and When to Register

An e-commerce LLC may have sales tax obligations in states other than the one where it was formed. What we need to analyze is not only where the company is registered: where it conducts business, where it stores inventory, which states it sells to, and who processes each sale also matter.

If you sell through Shopify, Amazon, or Etsy from Spain or Latin America, you should not activate taxes in every state or assume that the marketplace handles everything. First, we identify the facts; then, we check the current rules in each state and decide, with tax support when appropriate, where to register, collect, and file.

Short answers before we begin

Does a Wyoming LLC only pay sales tax in Wyoming? No. Formation and sales tax obligations require separate analyses. You may have obligations outside Wyoming and may not need a sales tax registration there solely because you formed the LLC.

Does living outside the United States eliminate sales tax? No. A foreign company or a foreign-owned LLC may establish a sufficient connection with a state through its physical activity or sales.

Do Amazon or Etsy handle everything? They may collect and remit tax on transactions covered by marketplace facilitator laws. That does not automatically resolve direct sales or all seller obligations.

Do I have to collect tax from the first sale? There is no single answer for every state. We need to review whether nexus exists, whether the sale is taxable, whether an exemption applies, and when registration and collection are required. We do not recommend collecting taxes without determining the obligation and obtaining the applicable permit.

The four pieces of information that determine the analysis

1. Where you have a physical presence

Nexus is the connection that allows a state to impose tax obligations on a business. For sales tax, it may arise from physical facts: an office, employees, inventory, your own warehouse, or goods stored by a third party. The activities of contractors or other representatives may also matter under state rules.

We should not confuse a legal address with actual operations. The registered agent receives official documents for the LLC; that role alone does not turn the registered agent’s address into your store, office, or warehouse. We need to document what actually happens in each location, not complete the analysis based on an address in the Articles of Organization.

2. Which states you sell to and how much you sell in each one

Economic nexus allows a state to impose obligations on sellers without a physical presence when they meet the criteria established by its laws. Thresholds, measurement periods, and the sales included are not the same in every state.

We need sales by destination and period, not just the LLC’s total revenue. We also need to review whether the rule counts gross sales, retail sales, or taxable sales, and how it treats exempt sales and sales made through marketplaces. A threshold found in an old publication may be outdated; we verify it against the state authority and the Streamlined Sales Tax state tables.

3. Who facilitates each sale

A sale on Amazon or Etsy and a sale through your Shopify store should not be combined without identifying who is responsible for collecting. For transactions covered by a marketplace facilitator law, the platform may have that responsibility.

For a direct store, we should not assume that the software takes over our obligation. A tool calculating tax does not mean that it has registered us, filed returns, or remitted the money. We review the features purchased, reports, and state law before considering a task resolved.

4. What you sell, who you sell it to, and what documentation you have

The classification of the product or service may change the outcome. Physical goods, certain digital products, and services are not treated identically in every state. Sales for resale or other exemptions may also apply, but it is not enough for the buyer to say they have a business: we need to retain the documentation required by the state.

The delivery address, the applicable rules for determining the location of the sale, discounts, returns, and shipping charges may affect the calculation. That is why we need transaction-level records, not just the total deposited by the payment processor.

What changed with Wayfair

In 2018, the United States Supreme Court decided South Dakota v. Wayfair and stopped requiring physical presence as an essential condition for a state to impose collection obligations on a remote seller.

This did not create a single national sales tax or a federal registration that works for every state. Each state retains its own rules. The limits examined in that case should also not be copied as though they were the current thresholds throughout the United States.

For a store we operate from Colombia, Mexico, or Spain, the practical consequence is clear: not having a U.S. office does not end the analysis. We need to review sales and inventory, identify the relevant states, and consult their current rules. The SBA guide to growing a business provides business context but does not replace the laws of each jurisdiction.

Marketplaces: what they cover and what we need to review

Marketplace facilitator laws shift to certain platforms the obligation to collect and remit tax on facilitated sales that fall within their scope. This may simplify part of compliance, but we need to confirm the specific coverage, state, and type of transaction.

If we sell only through a marketplace, some states may not require the seller to register when the platform collects on all sales. Others may require registration because of physical presence or other circumstances, or may maintain reporting and filing obligations. We do not apply one state’s exception to the others.

In addition, marketplace sales may count toward certain thresholds even when the facilitator collects the tax. The answer depends on state rules: separating them in our reports does not mean automatically excluding them.

For example, if an LLC sells on Amazon and also through Shopify, the tax remitted by Amazon does not automatically cover what is sold through the direct store. We need to analyze that second channel and avoid collecting twice on transactions for which the marketplace is already responsible.

Inventory stored through fulfillment programs deserves special attention. We request location and movement reports: it is not enough to know which country we use to manage the store or to identify the platform’s headquarters. You can learn more about these points in the Streamlined Sales Tax guides for remote sellers and marketplace sellers.

The mistake of thinking Wyoming determines all your sales taxes

Forming the LLC in Wyoming establishes its corporate jurisdiction. By itself, it does not determine the tax applicable to all sales you ship to other states. It also does not mean that you must automatically obtain a Wyoming sales tax license because you have a registered agent there.

Example 1: operations from Spain and direct sales to multiple states. If we have no inventory, workers, or actual operations in Wyoming, we do not infer a sales tax obligation there solely from the formation. Instead, we review sales destinations, economic thresholds, and actual activity in each state.

Example 2: inventory in a warehouse in another state. Even if the LLC is in Wyoming and its owner lives in Mexico, storing goods in another state may create physical nexus there. We need to analyze that fact without necessarily waiting to reach an economic threshold designed for remote sellers without a physical presence.

Example 3: Amazon plus your own store. If Amazon collects on facilitated sales and we make direct sales to the same state, we need to check whether marketplace volume is included in the threshold calculation and what obligations remain for our own sales.

Example 4: actual activity in Wyoming. If there is inventory, an office, or another relevant presence there, or if the applicable economic criteria are met, then Wyoming obligations should be examined. We consult its Title 39 and sales tax licensing rule; we do not rely on the idea that the state of formation is always exempt or always requires registration.

These examples guide the analysis; they are not tax conclusions about your business. The location of the goods, dates, and product treatment may change the outcome.

A practical process for determining where to act

1. Gather the company’s information. Keep the legal name, EIN, formation documents, operating address, and information about those who manage the business. Separate the registered agent’s address from the business’s actual locations.
2. Map your physical presence. Identify offices, employees, warehouses, your own inventory, and fulfillment. Note when each presence began and obtain reports that support it.
3. Separate sales channels. Distinguish marketplaces from your direct store and verify who collects and remits on each transaction. Keep the platform’s confirmation and tax reports.
4. Export sales by state and period. Use the destination of the transactions and retain details on sales, returns, exemptions, and channels. Do not measure the threshold using bank deposits net of fees.
5. Check the current state criteria. Review physical and economic nexus, the measurement period, included sales, and marketplace treatment. SST tables help guide us; we confirm the rule with the state authority before deciding.
6. Classify products and exemptions. Determine what is taxable in each relevant state and gather valid certificates when an exemption applies. Do not assume that a digital product, B2B sale, or service is always exempt.
7. Determine registrations and the start date. With a tax professional when necessary, decide where to apply for permits, when to begin collecting, and what to do if an obligation already existed. Do not invent a date or collect retroactively without analyzing the permitted procedure.
8. Configure collection and verify the flow. After completing the necessary registrations, review destinations, classifications, exemptions, and applicable rates in the channels under your responsibility. Check actual orders and refunds and avoid duplicating tax collected by the marketplace.
9. Maintain a calendar and review changes. Record filing frequencies, due dates, and login credentials. Some registrations require returns even when no tax is due; confirm the state requirement. Review sales and inventory regularly and before opening new channels or moving goods.

Common mistakes

• Looking only at Wyoming. The state of formation does not replace the nexus map or destination-based analysis.
• Confusing the economic threshold with an exemption for every business. Physical presence may create obligations even when sales volume is low.
• Using outdated thresholds or thresholds from another state. Amounts, conditions, and dates may change; we do not apply the Wayfair figures to every jurisdiction.
• Excluding marketplaces without reviewing the rule. The platform collecting does not mean those sales disappear from every calculation.
• Assuming Shopify registers and files. We need to confirm who performs each task and which service has been purchased.
• Collecting without a permit or duplicating the tax. Technology configuration should follow the legal analysis and necessary registrations.
• Forgetting returns when there are no sales. An open tax account may maintain obligations until it is closed under the state’s procedure.
• Ignoring prior periods. If we identify a past-due obligation, we review it with a professional before entering dates or filing incomplete information.

What you should retain

We keep corporate documents, tax permits, communications from authorities, and a record of the states analyzed, including the rule and date consulted. We also retain:

• Sales by transaction, destination, channel, and period, with discounts, returns, and shipping charges identified.
• Inventory, warehouse, and fulfillment movement reports.
• Marketplace reports showing the tax collected and remitted by the platform.
• Exemption or resale certificates and the applicable verifications.
• Returns, payments, supporting documents, calendar, and confirmations of tax account closures when applicable.
• Store configurations and relevant changes involving products, personnel, warehouses, and channels.

We do not establish a single retention period here: we verify the one that applies in each jurisdiction and the documents a professional needs to review prior periods.

How we can help

We can support you with forming and administratively maintaining your LLC so that you have an organized documentation base as you grow your business. You can explore our plans and review our services for other filings.

That support does not replace the tax analysis of nexus, the classification of your sales, or the decision about registrations and returns. When the situation requires it, we recommend reviewing your information with a qualified professional. We do not promise an absence of taxes, approvals, or a specific tax outcome.

Information verified on October 6, 2026.

Notice: This content is for informational purposes and does not constitute legal, tax, or financial advice. Obligations depend on the facts of your business and the current rules of each jurisdiction. We provide administrative services; we do not replace an attorney, accountant, or tax advisor. Before deciding on registrations, collection, returns, or correcting prior periods, consult a qualified professional.