I am a US Citizen, and for 20 years in United States I never seen this W-9 form, usually W-2 it's just a regular tax form.
I started on my new job a week ago, my employer told me that they going to pay me straight as a contract worker that means no tax deduction, that's why they give me this W-9 Form, they told me because they hired me as a contract worker living expenses is tax deductable, including gas, office expenses, internet, anything related to my work, is tax deductable, all the employee are telling me the same thing and they said that they been doing this for years, but I don't know how this thing works, I don't know if I have to own a house to do this,