I pay $12,000 per year for advertising on Zillow out of my own pocket. I am a comission based employee paid W2. Where do i enter this as a deduction

[Fern]

Since you are considered an employee, this will be included in employment expenses.

Select Federal Taxes
Select Deductions and Credits
Select Show More at Employment Expenses
Select Start at Job Related Expenses

Your deductions are considered employee business deductions.  Employee business deductions are part of the Miscellaneous Itemized Deductions category.  This category must exceed 2% of your adjusted gross income before they can be included in your itemized deductions.  Turbo Tax will do the 2% calculation for you.  This means if your adjusted gross income is $30,000, and your Miscellaneous Itemized Deductions are $750, $150 will be included in your itemized deductions.

For more information see https://www.irs.gov/uac/employee-business-expenses-1 .