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What can be considered a foreign trust?"
A foreign trust is any trust other than a domestic trust, per Treas. Reg. §301.7701-7(a):
(1) A trust is a United States person
if -
(i) A court within the United States
is able to exercise primary supervision over the administration of the trust (court test); and
(ii) One or more United States persons
have the authority to control all substantial decisions of the trust (control test).