I started using my home office for my business since August 2025, the home office accounts for 11% of the home living area, to my understanding, the correct formula should be total_expense * 11% * portion_of_year_used_for_home_office.
However, Turbotax does not seem to factor in the last factor even through I explictly entered the first day used for business and number of month used for more than 15 days. I tried to toggle the date and it does NOT affect the outcome, it seems Turbotax is defaulting the home office for the entire year.
