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LLC in DE getting money from U.S company

it depends
the answer is NO if it is not US source income
it is neccessary to have detailde bussiness description to figure out
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let say, the DE LLC is offering consultancy services to an other U.S company.
the DE LLC gets one wire every month from this U.S company.
but, the consultancy itself which is more intermediation is between companies outside the U.S.. not sure if it's clear
 
A US llc is tax transparent, so the transaction, if taxable, would be taxable also if you sell as a foreign person/company to the US customer.
Sales to us person might be taxable (even for foreigners) if the sales is "regular, substantial and continuous" but in many cases a tax treaty will avoid any tax responsibility for the foreign seller (including the foreign sole member of a disregarded US llc).
 
Single member Delaware LLC will not be taxed in the US even if you work (receive or send funds) to US clients. It is important that you are not a US resident and that you do not have any kind of physical presence in the United States. DE LLCs have the so-called pass-through taxation system and all taxes pass through the entity to the end owner who should later report that profit in their home country.