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@HOPE2 wrote:

started(business began around July).

How can I add the rest on Sch A?

 

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It only works for a full year.

(1) Manually prorate the annual taxes and only enter the partial year amount on 8829.

(3) Calculate what SHOULD be on Schedule A.  Take that number, subtract what the program is automatically putting their, and enter the result (the remaining amount) on one of the other lines, such as second home.