@Se7en.14 So I myself am actually spending most of today while im at work looking at OBI and trying to master it. I don't know for sure but I would imagine this could be a decently heavily tested topic on the exam. I can def see it being a simulation question for sure. In regards to the phase out, I would assume you are talking about the income limitations and the w-2/property limitations.
The taxable income limitation basically gives us a dollar value phase out to see if one would be able to take the deduction, single (157,501-207500) married (315,001-415,000). the other limitation is the w2 and property limitation.
Limited to the greater of
1) 50% of w2 for the business OR
2) 25% of the w2 + 2.5 % of qualified property at its ORIGINAL COST. (Qualified property is anything that is tangible and subject to depreciation by the business during the year)
I'm still figuring it out myself…hope this helps.