If company A inc. is incorporated in the BVI and company B inc. in incorporated in Delaware and A inc. owns 100% of B inc. Does company A has to pay dividend taxes when receiving dividends from company B?
Here you go, the tax treaty between the US and the BVI. https://www.congress.gov/treaty-document/97th-congress/6?s=1&r=9 (On Avvo you get analysis; if you want tax advice you can rely on, hire a lawyer.)
The above is general legal and business analysis. It is not "legal advice" but analysis, and different lawyers may analyse this matter differently, especially if there are additional facts...
That is exactly the kind of specialized question that you can find only answerable in the law books after much work or in ten minutes by a corporation tax attorney
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