Not necessarily.  You may choose to file the Form 1041 but the following AICPA article describes, in detail, alternatives to filing form 1041 for this type of trust. https://www.thetaxadviser.com/issues/2013/sep/clinic-story-03.html

Thanks!  This statement was included in the link .."by filing the Form 1041, the trustee is in effect letting the IRS know that the items of income or deductions are instead reportable by the “deemed owner.” The activity that is reportable by the deemed owner is summarized on a separate statement"  So do you know if that $900 per month is considered actual rental income?  If I just file a blank 1041 with a statement showing $900 per month received by the trust and show the amount of property tax and insurance that was paid , my dad would be able to deduct the property taxes on his personal return but would he have to include "rental income"? Seems confusing because it was actually money HE paid to the trust only to cover taxes and insurance? Sorry I am confused.  The trust did not have any other income or expenses.

The rental income reported would be the net income after the deduction for property taxes and any other expenses incurred related to the rental.

Oh ok.  That would be zero then.  Thank you very much for your help!