In Lacerte, enter business interest expense in Screen 20.1, Other Deductions, and select "K - Excess business interest expense" with an amount.  The amount prints on Form 8990, page 3, Line 43, Column (c) . You will also need to enter the partners portion of "(20AE) Excess taxable income" and "(20AF) business income expenses" in screen 20.1. If the "business interest expense" is not limited on Form 8990, page 3, it will automatically reduce Ordinary Income from that K-1.