Gross income for the tax year of $600 or more, or
A beneficiary who is a nonresident alien.
An estate is a domestic estate if it is not a foreign estate. A foreign estate is one the income of which is from sources outside the United States that is not effectively connected with the conduct of a U.S. trade or business and is not includible in gross income. If you are the fiduciary of a foreign estate, file Form 1040NR, U.S. Nonresident Alien Income Tax Return, instead of Form 1041.