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ok, i ran through my 2009 1040, 8283, 8829, sched A. my biz takes a paper loss of about $3500. on the biz side i get a ~18% for home use. my biz doesnt require much resources so the deduction is mostly on mortgage interest, pmi, and real estate taxes. as such my personal deduction is about 82% of those same numbers.
but odd. if i run all the #'s with and without my biz, i show a higher tax return without my biz loss ($150 more refund is i didnt include biz). how can this be?
also, in i8829 on page 3 it explains how you use % of mortgage interest, pmi, and real estate tax for doing personal on sched A. weird thing is there is no line item for showing pmi on form 8829. do you just roll in pmi with interest on line #10 ??