we can't see your return. renting is a passive activity and there are rules to the amount of losses that can be deducted. the limit is figured on form 8582 and shown on line 11. also look at form 6251 you may be subject to the alternative minimum tax.
if these don't show why your taxes are going up.
you'll have to compare your tax return with and without line by line and then post back in this thread what you found and maybe we can explain what is happening.
or you can upgrade to Turbotax Live to have a Turbotax pro look over your return.
