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Do I have to pay taxes in the US if my online store sells to US customers even though I don't live in the US?
You're not physically present in the US, you're not a US citizen, you're not a green card holder, and you don't have a business that is registered in the US - US laws do not apply to you. You're not in any way under the US jurisdiction.  Effectively connected income is income effectively connected to your business in the US. You're not in the US, so there's nothing to effectively connect your income to. Quote from the link: You usually are considered to be engaged in a U.S. trade or business   when you perform personal services in the United States. You ask: If I form an LLC or C corp am I liable for this withholding tax? If you form a legal entity in a US jurisdiction - then that entity becomes subjected to that jurisdiction. If you're physically present in the US - then ECI may become an issue, and you also may become a resident based on the length of your stay.