Single - Must I File?
Answer:
For the current year, If your filing status is single and you are under 65 then your gross income must be at least $9,750 ($9,500 in 2011) to file a 1040 tax return. If you are 65 or older then your gross income must be at least $11,200 ($10,950 in 2011). Gross income does not include Social Security benefits.
