Form 8829 is rounding up my mortgage interest which is creating an error

[mommyagain02]

I have an error in Form 8829 because I entered my mortgage interest including the cents but it is rounding up in this form creating an error of -$.20. It wants me to fix it but I don't know where.

[hbl3973]

This is a bit of a problem that arises due to the IRS requirements that the commercial software always do rounding.  (I calculate to the cent and choose rounding only when it gives me a lower tax bill.)  You might simply go in and round the figure you are entering to the nearest dollar and see if that keeps the 8829 check happy.  Believe me, the IRS does not care about differences of less than a dollar here and there.