My house has 2000 square feet of living area, as reported on appraisals and property tax records.
It also has a 1000 square foot completely finished basement (three walls above ground, air conditioning, carpet, internet, alarm, etc.) that I use exclusively as my office for me and my two employees. The basement is about 6 inches not tall enough to qualify as living area.
What is the correct way to determine the square footage for a home office deduction? Is it just 33.3% (1000/3000), even though the office is a basement?