Sales Tax Nexus for Foreign E-Commerce Sellers Using U.S. LLCs
How to approach this
A source-based path from understanding the rule to filing and recordkeeping.
Determine the requirement
Confirm whether and how the rule applies to you.
Identify the forms
Map the requirement to the specific IRS forms involved.
Prepare and file
Complete the forms accurately and submit on time.
Retain records
Keep documentation supporting every figure you report.
Key Takeaways
- Sales tax nexus is determined state by state.
- Physical presence and economic thresholds can both matter.
- Marketplace and direct-store sales should be reviewed together.
- Register with the state before collecting if nexus truly exists.
Nexus is a state-level problem, not one national switch
Shopify's U.S. tax liability guidance is useful because it shows that nexus can arise from physical presence or economic thresholds, and that different states use different threshold periods. That is exactly why foreign e-commerce founders should stop asking 'Do I have U.S. sales tax?' as if it were one federal question.
The right question is which states may now care, and why.
What creates nexus for foreign sellers most often
Common triggers include inventory or fulfillment presence, business locations, marketplace activity counted under state law, and reaching economic thresholds. Some founders hit nexus through growth. Others hit it through logistics without realizing it, especially once inventory, 3PL storage, or marketplace programs start moving products through multiple states.
If you sell on both marketplaces and your own store, you should review those channels together rather than separately.
What to do once a state appears on the radar
Shopify says that if you determine sales tax is required in a state, you should first register with that state's tax authority before setting up collection. That sequencing matters. A founder should not simply toggle tax collection everywhere without understanding permit and filing consequences.
Use software to monitor thresholds, but use state authority guidance and professional review before registration.
Frequently Asked Questions
Do all states use the same nexus threshold period?
No. Shopify notes that states use different measurement periods, such as current year, prior year, rolling twelve months, or prior quarters.
Can marketplace activity affect nexus even if the platform collects tax?
Yes. Shopify says some states include marketplace transactions within nexus requirements.
Should I register in every state as a precaution?
Usually not without review. Registration can create filing obligations, so it is better to confirm nexus first.
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