Not to be confused with Yukon wolf. The northwestern wolf, Canis lupus occidentalis, also known as the Mackenzie Valley wolf or northern timber wolf is a subspecies of gray wolf in western North America. It ranges from the upper Mackenzie River Valley, southward into central Alberta.
The executor must file a federal income tax return (Form 1041) if the estate has: 1  gross income for the tax year of $600 or more, or. 2  a beneficiary who is a nonresident alien.
1 Also, do not file an amended return because you forgot to attach tax forms, such as a W-2 or schedule. 2  The IRS will usually send you a request for those. 3  You usually have three years from the date you filed your original tax return to file Form 1040X to claim a refund.