I agree Turbotax is lacking for this question. I was able to figure it out by looking across a few other tax forms. For me, there was a value on Form 1040 that matched the number in question, which referenced that I look at Schedule 1. Turns out my "other deductions" were a sum of a deductible part of self employment tax, SEP IRA contribution, and self employed insurance -- all indicated on Schedule 1.
