What is a foreign partnership?
The definition of a partnership is when at least two individuals or entities work together toward a common profitable venture. A foreign partnership is a partnership that is created or organized outside the U.S. If a U.S. person has an interest in a foreign partnership, they may have to file Form 8865 to report their interest in that partnership. If a foreign partnership has income from the U.S., they may be required to file Form 1065 to report that U.S. income.
Note that even if an entity is considered a partnership under the laws of a foreign country, it may be considered something else in the U.S. for tax purposes, such as a corporation.