I have the same situation, which I have solved over the past few years by using another copy of turbo-tax and in it using the home office deduction calculator as if my k-1 income was from a Sched C business income and then putting that number in Sched E as a business expense not paid by the k-1 partnership. Too bad there's no home office deduction calculator for k-1 related expenses, but the system I propose here seems to work well. Of course, it is important to note that I am not a tax accountant.
