Hi

I am entering mortgage interest and real estate taxes in form 1098. I then claim 10% of each in form 8829 from home office. 

In schedule A both mortgage interest and real estate taxes pull in from the 1098.  I can adjust the mortgage interest claimed down by 10% in line 8a, schedule A. But real estate taxes pull in as the full amount in 5b. How do i adjust these real estate taxes down by 10%? 

Thanks Nolan