I am confused by the tax rules. My father is 72 years old, and has social security of $28K and other income of $3,300/yr. If I follow the worksheet on the back of the ssa1099, to take the SS amount, divide in half=$14,000+ other income, $3,300 which gives the total taxable income of $17,300. He is filing married, but separately. When I enter this information into turbo tax, it says that he owes about $400. Help me understand why this income is taxable.
