How much income do you have to earn before you file income tax 2012?

How much income you have to earn before filing a 2012 Income Tax Return is determined by your filing status as Single, Married Filing Joint, Married filing Separate, Head of Household or qualifying widower. Based on your filing status and age if at the end of 2012 you are under 65 or 65 or older, file a return if your gross income was at least $3800 to $19,500.