Hello, I bought a house this year and just got married. My husband has an ITIN number and no social security number. We both work. We have no children. Our total income is about $90,000/yr. We will be filing our taxes as married/jointly. I need to change my w4 for work. I am confused if I should have "1" or "2" for total allowances claiming. It is also difficult for me to determine deductions as I don't know my home mortgage interest as this will be my first year owning a home. Basically I just don't want to end up paying a lot when we file our taxes! Please help.