When you have EIC on your return, adding expenses can reduce your refund. The tax benefit you receive from the rental or business deduction is less than your reduction in Earned Income Credit. You have to take all eligible business and rental deductions if you are claiming the EIC.
As stated in the other thread you commented in, the best solution to figure it out is to print out your tax return before you enter those deductions, then print it out again after you enter those deductions. The look at which lines change on 1040 and the numbered Schedules (Schedule 1, Schedule 2, etc.).
If it still doesn't make sense, then post back with which lines changed on the 1040 and the numbered Schedules and somebody may be able to help you. @yim_h
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