Do Foreign Businesses Have to Collect Sales Tax in the US? A Practical Guide for Global Founders

Foreign companies selling into the United States often assume sales tax only matters if they have an office, warehouse, or employees in the country. That assumption is risky. In many states, sales tax obligations can begin even when a business is entirely outside the US.

For global founders, the real question is not simply whether you are “based” in the United States. The real question is whether your company has created a tax connection, or nexus, with one or more states. Once nexus exists, you may be required to register, collect, file, and remit sales tax on taxable sales made to customers in those states.

This guide explains when foreign businesses must collect sales tax in the US, how nexus works, what types of sales may be taxable, and what practical steps help you stay compliant.

What US Sales Tax Is

US sales tax is a consumption tax imposed at the state and, in some places, local level. It is generally collected from the customer at the point of sale and then remitted by the seller to the proper tax authority.

Unlike income tax, sales tax is not federal. There is no single nationwide sales tax rule that applies everywhere. Instead, each state sets its own rules, rates, exemptions, filing requirements, and registration process. That means the same product can be taxable in one state and exempt in another.

For foreign businesses, this patchwork is the source of most compliance problems.

When a Foreign Business May Need to Collect Sales Tax

A foreign business may need to collect sales tax if it has nexus in a state. Nexus is the legal connection between the business and that state.

There are several ways a foreign business can create nexus.

1. Economic Nexus

Economic nexus is the most common trigger for remote sellers. If your sales into a state exceed that state’s threshold, you may have to register and collect sales tax there even if you have no physical presence.

Thresholds vary by state. Some states use a revenue threshold only, while others also use transaction counts. Common triggers include:

• A dollar amount of sales into the state
• A minimum number of transactions shipped into the state
• A combination of revenue and transaction activity

For a foreign business, this means shipping to US customers can create obligations long before you open an office or hire staff in the country.

2. Physical Nexus

Physical nexus exists when your business has a tangible connection to a state. Examples include:

• An office or coworking space
• Inventory stored in a warehouse or fulfillment center
• Employees or contractors working in the state
• Temporary events, trade shows, or installations in some situations

Foreign e-commerce sellers often create physical nexus without realizing it, especially when inventory is stored with a third-party logistics provider in the US.

3. Marketplace Activity

Many businesses sell through platforms such as Amazon, Etsy, Walmart Marketplace, or other online marketplaces. In some states, marketplace facilitators are responsible for collecting and remitting sales tax on behalf of sellers.

That does not mean the seller has no responsibilities at all. You may still need to:

• Track sales by state
• Understand whether the marketplace is collecting on your behalf
• Register in states where you have other taxable activity
• Keep records for filing and audit support

Marketplace collection can reduce the administrative burden, but it does not eliminate the need to understand your own nexus footprint.

What Sales Can Be Taxable

Not every sale is taxed the same way. Whether a transaction is taxable depends on the state, the product or service, and the customer location.

Tangible Goods

Physical products are often taxable, but not always. Some states exempt certain items such as food, clothing, or medical supplies. Others tax most retail goods.

If you sell physical products online, especially to multiple states, you should assume taxable treatment may apply until you confirm otherwise.

Digital Products

Digital products can be taxable in some states. Examples include:

• Downloadable software
• Online courses
• Streaming content
• eBooks
• Digital subscriptions

The rules are highly state-specific. A digital product that is taxable in one state may be exempt in another.

Services

Services are the least uniform category. Some states tax many services, while others tax very few. A consulting service, design service, or SaaS subscription may be treated differently depending on the state and how the transaction is structured.

If your business sells services into the US, review each relevant state carefully rather than assuming services are always exempt.

Why Foreign Businesses Get Caught Off Guard

Foreign founders often focus on corporate formation, payment processing, and shipping logistics before they think about sales tax. That creates several common blind spots.

“We have no US office, so we are not liable.”

This is one of the most common misconceptions. Economic nexus means physical presence is no longer the only test in many states.

“The platform handles everything.”

E-commerce platforms may calculate tax at checkout, but they do not automatically solve registration, filing, exemption management, or recordkeeping.

“We are too small to matter.”

Small businesses can cross thresholds faster than expected, especially if one product goes viral or a marketplace drives sudden growth.

“We only sell a few items to US customers.”

A low volume of transactions can still create obligations if a state uses a transaction count test or if your revenue grows quickly.

Step-by-Step Compliance Checklist for Foreign Businesses

If you sell into the United States, use this checklist to reduce risk and stay organized.

1. Identify Where You Sell

Start by mapping your sales by state. Look at:

• Customer shipping destinations
• Marketplace sales by jurisdiction
• Direct website sales
• Inventory storage locations
• Employees, contractors, or representatives in the US

A basic state-by-state sales summary is the foundation for every other decision.

2. Determine Whether You Have Nexus

Compare your activity against each state’s physical and economic nexus rules. Pay attention to:

• Revenue thresholds
• Transaction thresholds
• Inventory locations
• Fulfillment partnerships
• Trade show activity or other in-state presence

This step often determines whether you need to register at all.

3. Register Before Collecting

If you have nexus, register for a sales tax permit before charging tax to customers. Collecting tax without registration can create penalties and administrative problems.

4. Configure Tax Collection Correctly

Make sure your checkout system is set up to apply the right tax rate in the right state. This includes:

• Product taxability settings
• Shipping and handling treatment
• Exemption certificates when applicable
• Marketplace collection settings

5. File Returns on Time

Sales tax is usually filed monthly, quarterly, or annually depending on the state and your sales volume. Even if you owe no tax in a period, a zero return may still be required.

6. Keep Detailed Records

Maintain records of:

• Sales by state
• Tax collected
• Registration certificates
• Exemption certificates
• Filed returns and payment confirmations

Good records matter during audits and make it easier to expand into new states.

Common Mistakes to Avoid

Foreign companies often run into the same avoidable errors.

• Waiting until after sales increase to review nexus
• Assuming all US states have the same rules
• Letting inventory sit in fulfillment centers without checking physical nexus
• Failing to track marketplace-collected tax separately from direct sales
• Collecting tax before registering
• Ignoring filing obligations after registration
• Treating digital products or services as automatically exempt

Each of these mistakes can lead to penalties, interest, or back tax liability.

How US Company Formation Fits In

Sales tax compliance is not the same as entity formation, but the two often overlap.

Many foreign founders choose to form a US LLC or corporation to support bank accounts, payment processing, marketplace access, and operational credibility. A properly formed US entity can also help create a cleaner structure for state registrations and ongoing compliance tasks.

Zenind helps founders form US companies and manage the state-level administrative work that comes with operating in the United States. For global entrepreneurs, that structure can be an important first step before tackling tax registrations, reporting requirements, and growth into new states.

Practical Scenarios

Here are a few examples that show how sales tax obligations can arise.

Example 1: Foreign Brand Selling Physical Products Online

A business based outside the US sells skincare products through its website. Sales grow quickly in Texas and Florida. The company stores inventory in a US fulfillment center.

Result: The company may create both physical and economic nexus and likely needs to register and collect in one or more states.

Example 2: SaaS Company Selling Subscriptions

A foreign software company sells monthly subscriptions to US customers. Some states tax SaaS, while others do not.

Result: The company must review the rules in each state where it exceeds nexus thresholds.

Example 3: Digital Course Creator

A founder outside the US sells downloadable courses and paid memberships to American customers.

Result: Taxability depends on the state and the specific product structure. The founder may need to collect tax in some states but not others.

Questions Foreign Founders Should Ask

Before expanding further into the US, ask:

• Where are our customers located?
• Do we exceed any state economic nexus thresholds?
• Do we store inventory in the US?
• Are marketplaces collecting tax for us automatically?
• Are our products or services taxable in the states where we sell?
• Have we registered before collecting tax?
• Are we filing returns on time in every registered state?

If you cannot answer these confidently, it is time to review your compliance setup.

Final Takeaway

Foreign businesses do have to collect sales tax in the US when they create nexus in a state and sell taxable products or services there. For many global founders, that trigger happens faster than expected through online sales, inventory storage, or marketplace activity.

The safest approach is to track your sales by state, understand nexus, register before collecting, and keep reliable records. If you are building a US business from abroad, solid company formation and compliance habits from the start can save significant time and cost later.

Disclaimer

This article is for general informational purposes only and does not constitute legal or tax advice. Sales tax rules change by state and business model, so consult a qualified professional for guidance on your situation.