I am assuming that you
are trying to answer the question about percent of gross income as associated
with a home office. If this is not the
case, please add more details.
There is not a set formula for determining the percent of
gross income attributable to a home office.
You will need to determine that for yourself based on your personal
situation.
For example:
If all your work is done in your home office, enter 100 (for 100%). But if you figure that one-fourth of your
income is made on the road (or anywhere outside of your home office) and
three-fourths of your income is made from your home office, enter 75 (for 75%).