Deductions & credits

Ok ... if this physical office is for your own business where you pay the expenses like rent/utilities ( and not a client's office) then you cannot take any office in home expenses.  The fact that you choose to work from the house doesn't make it a work space since you have a permanent place for your business elsewhere.  And the miles from your home to the business are also not deductible ... they are commuting miles just like anyone else that drives to work.