After changes to the U.S. Bankruptcy Code in 2005, those who seek to file a Chapter 7 bankruptcy must take a 'means test' in order to qualify. Under this test, filers must compare their own current monthy income, as that term is defined, to "median family income".
Under U.S. Bankruptcy Code, median family income is defined as, for any year: (A) the median family income both calculated and reported by the Bureau of the Census in the then most recent year; and (B) if not so calculated and reported in the then current year, adjusted annually after such most recent year until the next year in which median family income is both calculated and reported by the Bureau of the Census, to reflect the percentage change in the Consumer Price Index for All Urban Consumers during the period of years occurring after such most recent year and before such current year.
Median Family Income numbers change from time to time and can be found on the U.S. Trustee's site, linked in with Bankruptcy Court sites.
The definition of median family income is found in the U.S. Bankruptcy Code under section 101(39A). Those filing bankruptcy should not do so without retaining an experienced bankruptcy practitioner in their jurisdiction to help them through the challenged of bankruptcy law and procedure.